CN111397077B - Temperature control method and device, storage medium and air conditioner - Google Patents

Temperature control method and device, storage medium and air conditioner Download PDF

Info

Publication number
CN111397077B
CN111397077B CN202010110548.7A CN202010110548A CN111397077B CN 111397077 B CN111397077 B CN 111397077B CN 202010110548 A CN202010110548 A CN 202010110548A CN 111397077 B CN111397077 B CN 111397077B
Authority
CN
China
Prior art keywords
air conditioner
frequency
temperature
compressor
frequency converter
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active
Application number
CN202010110548.7A
Other languages
Chinese (zh)
Other versions
CN111397077A (en
Inventor
周卫华
罗建飞
寇芷薇
姚宏锋
马旻
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Gree Electric Appliances Inc of Zhuhai
Original Assignee
Gree Electric Appliances Inc of Zhuhai
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Gree Electric Appliances Inc of Zhuhai filed Critical Gree Electric Appliances Inc of Zhuhai
Priority to CN202010110548.7A priority Critical patent/CN111397077B/en
Publication of CN111397077A publication Critical patent/CN111397077A/en
Application granted granted Critical
Publication of CN111397077B publication Critical patent/CN111397077B/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Images

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00—Control or safety arrangements
    • F24F11/30—Control or safety arrangements for purposes related to the operation of the system, e.g. for safety or monitoring
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00—Control or safety arrangements
    • F24F11/50—Control or safety arrangements characterised by user interfaces or communication
    • F24F11/61—Control or safety arrangements characterised by user interfaces or communication using timers
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00—Control or safety arrangements
    • F24F11/62—Control or safety arrangements characterised by the type of control or by internal processing, e.g. using fuzzy logic, adaptive control or estimation of values
    • F24F11/63—Electronic processing
    • F24F11/64—Electronic processing using pre-stored data
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00—Control or safety arrangements
    • F24F11/70—Control systems characterised by their outputs; Constructional details thereof
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
    • H05K7/00—Constructional details common to different types of electric apparatus
    • H05K7/20—Modifications to facilitate cooling, ventilating, or heating
    • H05K7/2089—Modifications to facilitate cooling, ventilating, or heating for power electronics, e.g. for inverters for controlling motor
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F2140/00—Control inputs relating to system states
    • F24F2140/50—Load

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Signal Processing (AREA)
  • Thermal Sciences (AREA)
  • Fuzzy Systems (AREA)
  • Mathematical Physics (AREA)
  • Human Computer Interaction (AREA)
  • Air Conditioning Control Device (AREA)
  • Inverter Devices (AREA)

Abstract

The invention discloses a temperature control method, a temperature control device, a storage medium and an air conditioner, wherein the method comprises the following steps: determining the operation load of the air conditioner; if the operating load of the air conditioner is a first load, acquiring a power consumption parameter of the air conditioner, a photovoltaic power generation parameter and the temperature of a rectifier module of the frequency converter, and performing first control on the temperature of the frequency converter of the air conditioner according to the power consumption parameter, the photovoltaic power generation parameter and the temperature of the rectifier module; if the operation load of the air conditioner is the second load, acquiring the power consumption parameter of the air conditioner, the photovoltaic power generation parameter, the temperature of a rectification module of the frequency converter and the suction superheat degree of a compressor of the cooling equipment, and performing second control on the temperature of the frequency converter of the air conditioner according to the power consumption parameter, the photovoltaic power generation parameter, the temperature rise rate of the frequency converter and the suction superheat degree of the compressor. This scheme can solve the problem that the heat that the converter produced influences the reliability of converter self work, reaches the effect of the heat reliability in order to promote converter self work of dispelling the heat that the converter produced.

Description

Temperature control method and device, storage medium and air conditioner
Technical Field
The invention belongs to the technical field of air conditioners, and particularly relates to a temperature control method and device, a storage medium and an air conditioner, in particular to a cooling temperature control method and device for an onboard frequency converter of a photovoltaic direct-drive variable frequency air conditioner, a storage medium and an air conditioner.
Background
In recent years, with the rapid development of economy in China and the improvement of energy conservation and emission reduction requirements, the photovoltaic direct-drive variable frequency air conditioning system has obvious advantages of environmental protection and energy conservation; the photovoltaic direct-drive variable frequency air conditioner is characterized in that photovoltaic direct current is directly merged into a direct current bus of a converter unit of a unit frequency converter, so that the effect of photovoltaic energy conversion direct drive is achieved, and in the conversion process, a frequency converter module (comprising a rectification module and an inversion module) can generate a large amount of heat and can influence the reliability of the work of the frequency converter.
The above is only for the purpose of assisting understanding of the technical aspects of the present invention, and does not represent an admission that the above is prior art.
Disclosure of Invention
The present invention aims to solve the above-mentioned drawbacks, and provide a temperature control method, a temperature control device, a storage medium, and an air conditioner, so as to solve the problem that the heat generated by the inverter affects the reliability of the inverter itself, and achieve the effect of dissipating the heat generated by the inverter to improve the reliability of the inverter itself.
The invention provides a temperature control method, which comprises the following steps: determining the operation load of the air conditioner; an operation load of an air conditioner, comprising: a first load or a second load, the first load being greater than the second load; if the operating load of the air conditioner is a first load, acquiring a power consumption parameter of the air conditioner, a photovoltaic power generation parameter of the air conditioner and the temperature of a rectification module of a frequency converter of the air conditioner, and performing first control on the temperature of the frequency converter of the air conditioner according to the power consumption parameter, the photovoltaic power generation parameter and the temperature of the rectification module; if the operation load of the air conditioner is the second load, acquiring the power consumption parameter of the air conditioner, the photovoltaic power generation parameter of the air conditioner, the temperature of a rectifier module of a frequency converter of the air conditioner and the suction superheat degree of a compressor of cooling equipment of the air conditioner, and performing second control on the temperature of the frequency converter of the air conditioner according to the power consumption parameter, the photovoltaic power generation parameter, the temperature rise rate of the frequency converter and the suction superheat degree of the compressor.
Optionally, the first controlling the temperature of the inverter of the air conditioner includes: determining the rising rate of the power consumption parameter of the air conditioner according to the power consumption parameter of the air conditioner, and determining the rising rate of the photovoltaic power generation parameter of the air conditioner according to the photovoltaic power generation parameter of the air conditioner; under the condition that the power consumption parameter rising rate of the air conditioner is smaller than the photovoltaic power generation parameter rising rate of the air conditioner, if the photovoltaic power generation parameter of the air conditioner is smaller than or equal to a first set parameter and the temperature of a rectification module of the frequency converter is larger than a set frequency limiting temperature, controlling the frequency converter to maintain the current frequency to operate; and adjusting the frequency of a compressor of the cooling device of the air conditioner according to the temperature of the rectification module.
Optionally, adjusting the frequency of the cooling device compressor of the air conditioner according to the temperature of the rectification module includes: after the frequency converter is controlled to maintain the current frequency to operate, if the temperature of the rectifier module is continuously detected to be greater than or equal to a first set temperature value within a first set time period, controlling the frequency of a compressor of cooling equipment of the air conditioner to increase by a first set frequency; after controlling the frequency of a compressor of cooling equipment of the air conditioner to increase by a first set frequency, if detecting that the temperature of a rectification module is greater than or equal to a set frequency reduction temperature and less than a set protection temperature after a second set time, controlling a frequency converter of the air conditioner to operate by reducing the current frequency by a second set frequency, and determining the temperature rise rate of the rectification module according to the temperature of the rectification module; if the temperature rise rate of the rectifier module is greater than or equal to the first set temperature rise rate, controlling the frequency of a compressor of cooling equipment of the air conditioner to rise to a third set frequency again; after controlling the frequency of a compressor of cooling equipment of the air conditioner to increase the third set frequency again, if the detected temperature of the rectification module is greater than or equal to the set temperature and less than the set frequency reduction temperature, controlling a frequency converter of the air conditioner to maintain the operation of the frequency reduced by the second set frequency from the current frequency; and if the detected temperature of the rectifier module is less than the set temperature, controlling the frequency converter of the air conditioner to operate for a third set time length after the frequency of the current frequency is reduced by the second set frequency, and then re-determining the operation load of the air conditioner.
Optionally, the second controlling the temperature of the inverter of the air conditioner includes: determining the rising rate of the power consumption parameter of the air conditioner according to the power consumption parameter of the air conditioner, and determining the rising rate of the photovoltaic power generation parameter of the air conditioner according to the photovoltaic power generation parameter of the air conditioner; under the condition that the power consumption parameter rising rate of the air conditioner is smaller than the photovoltaic power generation parameter rising rate of the air conditioner, if the photovoltaic power generation parameter of the air conditioner is smaller than or equal to a second set parameter, the power consumption parameter of the air conditioner is set power consumption, and the temperature of a rectification module of the frequency converter is smaller than a second set temperature value, controlling the frequency of a compressor of cooling equipment of the air conditioner to reduce a fourth set frequency; after controlling the frequency of a compressor of cooling equipment of the air conditioner to reduce a fourth set frequency, if the temperature of the rectifier module is detected to be still smaller than a second set temperature value after a fourth set time, determining the temperature reduction rate of the rectifier module according to the temperature of the rectifier module; and if the temperature drop rate of the rectification module is greater than or equal to the second set temperature rise rate, controlling the frequency of a compressor of the cooling equipment of the air conditioner to reduce the fifth set frequency again, and controlling the refrigerant circulation quantity of the cooling equipment of the air conditioner according to the suction superheat degree of the compressor of the air conditioner.
Optionally, the method for controlling the refrigerant circulation amount of the cooling device of the air conditioner according to the suction superheat degree of the compressor of the air conditioner comprises the following steps: after controlling the frequency of the compressor of the cooling equipment of the air conditioner to reduce the fifth set frequency again, if the detected temperature of the rectifier module is less than or equal to the third set temperature value and the suction superheat degree of the compressor of the air conditioner is less than or equal to the power consumption parameter increasing rate of the air conditioner, controlling the frequency of the compressor of the cooling equipment of the air conditioner to continuously reduce the fifth set frequency until the frequency of the compressor of the cooling equipment of the air conditioner is reduced to the set lowest frequency, controlling the frequency of the compressor of the cooling equipment of the air conditioner to maintain the set lowest frequency to operate, and adjusting the refrigerant circulation quantity of the cooling equipment of the air; and if the suction superheat degree of the compressor of the air conditioner is larger than the power consumption parameter increasing rate of the air conditioner, controlling the cooling equipment of the air conditioner to maintain the adjusted refrigerant circulation quantity to operate.
In accordance with the above method, another aspect of the present invention provides a temperature control apparatus, comprising: a determination unit for determining an operation load of the air conditioner; an operation load of an air conditioner, comprising: a first load or a second load, the first load being greater than the second load; the control unit is used for acquiring the power consumption parameter of the air conditioner, the photovoltaic power generation parameter of the air conditioner and the temperature of a rectification module of a frequency converter of the air conditioner if the operating load of the air conditioner is a first load, and performing first control on the temperature of the frequency converter of the air conditioner according to the power consumption parameter, the photovoltaic power generation parameter and the temperature of the rectification module; and the control unit is further used for acquiring the power consumption parameter of the air conditioner, the photovoltaic power generation parameter of the air conditioner, the temperature of a rectification module of a frequency converter of the air conditioner and the suction superheat degree of a compressor of cooling equipment of the air conditioner if the operating load of the air conditioner is a second load, and performing second control on the temperature of the frequency converter of the air conditioner according to the power consumption parameter, the photovoltaic power generation parameter, the temperature rise rate of the frequency converter and the suction superheat degree of the compressor.
Optionally, the controlling unit performs a first control on the temperature of the inverter of the air conditioner, and includes: determining the rising rate of the power consumption parameter of the air conditioner according to the power consumption parameter of the air conditioner, and determining the rising rate of the photovoltaic power generation parameter of the air conditioner according to the photovoltaic power generation parameter of the air conditioner; under the condition that the power consumption parameter rising rate of the air conditioner is smaller than the photovoltaic power generation parameter rising rate of the air conditioner, if the photovoltaic power generation parameter of the air conditioner is smaller than or equal to a first set parameter and the temperature of a rectification module of the frequency converter is larger than a set frequency limiting temperature, controlling the frequency converter to maintain the current frequency to operate; and adjusting the frequency of a compressor of the cooling device of the air conditioner according to the temperature of the rectification module.
Optionally, the control unit adjusts a compressor frequency of a cooling device of the air conditioner according to the temperature of the rectification module, and includes: after the frequency converter is controlled to maintain the current frequency to operate, if the temperature of the rectifier module is continuously detected to be greater than or equal to a first set temperature value within a first set time period, controlling the frequency of a compressor of cooling equipment of the air conditioner to increase by a first set frequency; after controlling the frequency of a compressor of cooling equipment of the air conditioner to increase by a first set frequency, if detecting that the temperature of a rectification module is greater than or equal to a set frequency reduction temperature and less than a set protection temperature after a second set time, controlling a frequency converter of the air conditioner to operate by reducing the current frequency by a second set frequency, and determining the temperature rise rate of the rectification module according to the temperature of the rectification module; if the temperature rise rate of the rectifier module is greater than or equal to the first set temperature rise rate, controlling the frequency of a compressor of cooling equipment of the air conditioner to rise to a third set frequency again; after controlling the frequency of a compressor of cooling equipment of the air conditioner to increase the third set frequency again, if the detected temperature of the rectification module is greater than or equal to the set temperature and less than the set frequency reduction temperature, controlling a frequency converter of the air conditioner to maintain the operation of the frequency reduced by the second set frequency from the current frequency; and if the detected temperature of the rectifier module is less than the set temperature, controlling the frequency converter of the air conditioner to operate for a third set time length after the frequency of the current frequency is reduced by the second set frequency, and then re-determining the operation load of the air conditioner.
Optionally, the second controlling the temperature of the inverter of the air conditioner by the control unit includes: determining the rising rate of the power consumption parameter of the air conditioner according to the power consumption parameter of the air conditioner, and determining the rising rate of the photovoltaic power generation parameter of the air conditioner according to the photovoltaic power generation parameter of the air conditioner; under the condition that the power consumption parameter rising rate of the air conditioner is smaller than the photovoltaic power generation parameter rising rate of the air conditioner, if the photovoltaic power generation parameter of the air conditioner is smaller than or equal to a second set parameter, the power consumption parameter of the air conditioner is set power consumption, and the temperature of a rectification module of the frequency converter is smaller than a second set temperature value, controlling the frequency of a compressor of cooling equipment of the air conditioner to reduce a fourth set frequency; after controlling the frequency of a compressor of cooling equipment of the air conditioner to reduce a fourth set frequency, if the temperature of the rectifier module is detected to be still smaller than a second set temperature value after a fourth set time, determining the temperature reduction rate of the rectifier module according to the temperature of the rectifier module; and if the temperature drop rate of the rectification module is greater than or equal to the second set temperature rise rate, controlling the frequency of a compressor of the cooling equipment of the air conditioner to reduce the fifth set frequency again, and controlling the refrigerant circulation quantity of the cooling equipment of the air conditioner according to the suction superheat degree of the compressor of the air conditioner.
Optionally, the control unit controls the refrigerant circulation amount of the cooling device of the air conditioner according to the suction superheat degree of the compressor of the air conditioner, and comprises: after controlling the frequency of the compressor of the cooling equipment of the air conditioner to reduce the fifth set frequency again, if the detected temperature of the rectifier module is less than or equal to the third set temperature value and the suction superheat degree of the compressor of the air conditioner is less than or equal to the power consumption parameter increasing rate of the air conditioner, controlling the frequency of the compressor of the cooling equipment of the air conditioner to continuously reduce the fifth set frequency until the frequency of the compressor of the cooling equipment of the air conditioner is reduced to the set lowest frequency, controlling the frequency of the compressor of the cooling equipment of the air conditioner to maintain the set lowest frequency to operate, and adjusting the refrigerant circulation quantity of the cooling equipment of the air; and if the suction superheat degree of the compressor of the air conditioner is larger than the power consumption parameter increasing rate of the air conditioner, controlling the cooling equipment of the air conditioner to maintain the adjusted refrigerant circulation quantity to operate.
In accordance with another aspect of the present invention, there is provided an air conditioner including: the temperature control device described above.
In accordance with the above method, a further aspect of the present invention provides a storage medium comprising: the storage medium has stored therein a plurality of instructions; the plurality of instructions are used for being loaded by a processor and executing the temperature control method.
In accordance with the above method, another aspect of the present invention provides an air conditioner, comprising: a processor for executing a plurality of instructions; a memory to store a plurality of instructions; wherein the plurality of instructions are stored by the memory and loaded and executed by the processor to perform the temperature control method described above.
According to the scheme provided by the invention, the situation of the power rising rate of the air conditioner compressor and the photovoltaic power generation is judged by detecting the power, the output power of the frequency converter is inhibited in advance, the temperature of a plate of the frequency converter can be prevented from rising sharply, and the reliability of the work of the frequency converter is improved.
Furthermore, according to the scheme of the invention, after the sharp temperature rise trend of the frequency converter module is controlled, the output power of the frequency converter is controlled according to the temperature rise rate and the frequency control of the compressor of the cooling equipment is synchronously combined, so that the junction temperature of the frequency converter module can be accurately regulated, and the heat generated by the frequency converter is prevented from influencing the working reliability of the frequency converter.
Furthermore, according to the scheme of the invention, the suction superheat degree control of the compressor of the cooling device is added under the condition of photovoltaic low-load operation, the refrigerant circulation quantity of the system is properly adjusted, the refrigerant circulation quantity can be accurately controlled, the supercooling and overheating adjustment is avoided, and the safe and stable operation of the photovoltaic direct-driven frequency converter is ensured.
Furthermore, according to the scheme of the invention, the power consumption power rising rate of the air conditioner compressor and the photovoltaic power generation power rising rate are detected and judged, the output power of the frequency converter is inhibited in advance, when the temperature of the plate of the frequency converter is controlled to rise sharply, the temperature rising rate of the frequency converter module is further detected, the output power of the frequency converter is controlled according to the temperature rising rate, the frequency control of the compressor of the cooling equipment is synchronously combined, the junction temperature of the frequency converter module is accurately regulated, and the safe and stable operation of the photovoltaic direct-drive frequency converter can be ensured.
Further, according to the scheme of the invention, the temperature of the frequency converter module is controlled by adding judgment conditions such as detecting and judging the power consumption power rising rate of the air conditioner compressor, the photovoltaic power generation power rising rate, the temperature rising rate of the frequency converter module and the like, and the junction temperature of the module is regulated in real time, so that the temperature of the frequency converter module can be controlled within a specific range, and the safe and stable operation of the photovoltaic direct-drive frequency converter is ensured.
Therefore, according to the scheme provided by the invention, when the photovoltaic high-load operation is carried out, the output power of the frequency converter is inhibited in advance according to the power consumption power rising rate of the air conditioner compressor and the photovoltaic power generation power rising rate, the problem that the heat generated by the frequency converter affects the working reliability of the frequency converter is solved, and the effect of radiating the heat generated by the frequency converter to improve the working reliability of the frequency converter is achieved.
Additional features and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention.
The technical solution of the present invention is further described in detail by the accompanying drawings and embodiments.
Drawings
FIG. 1 is a schematic flow chart of an embodiment of a temperature control method of the present invention;
FIG. 2 is a schematic flow chart illustrating an embodiment of a first control of the temperature of an inverter of an air conditioner according to the method of the present invention;
FIG. 3 is a schematic flow chart illustrating an embodiment of a method for adjusting the frequency of a compressor of a cooling apparatus of an air conditioner according to the temperature of a rectification module;
FIG. 4 is a schematic flow chart illustrating an embodiment of a second control of the temperature of the inverter of the air conditioner according to the method of the present invention;
FIG. 5 is a flowchart illustrating an embodiment of controlling a refrigerant circulation amount of a cooling device of an air conditioner according to a suction superheat of a compressor of the air conditioner in the method of the present invention;
FIG. 6 is a schematic structural diagram of a temperature control device according to an embodiment of the present invention;
FIG. 7 is a schematic structural diagram of an embodiment of an air conditioner according to the present invention;
fig. 8 is a control flow diagram of an embodiment of an air conditioner according to the present invention.
The reference numbers in the embodiments of the present invention are as follows, in combination with the accompanying drawings:
102-a determination unit; 104-control unit.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the technical solutions of the present invention will be clearly and completely described below with reference to the specific embodiments of the present invention and the accompanying drawings. It is to be understood that the described embodiments are merely exemplary of the invention, and not restrictive of the full scope of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
According to an embodiment of the present invention, a method for controlling temperature is provided, as shown in fig. 1, which is a schematic flow chart of an embodiment of the method of the present invention. The temperature control method can be applied to control of the cooling temperature of the onboard frequency converter of the photovoltaic direct-drive variable frequency air conditioner, and can comprise the following steps: step S110 to step S130.
At step S110, the operation load of the air conditioner is determined. The operation load of the air conditioner may include: a first load or a second load, the first load being greater than the second load. For example: the first load is a photovoltaic large load, and the second load is a photovoltaic small load.
In step S120, if the operating load of the air conditioner is the first load, acquiring a power consumption parameter of the air conditioner, a photovoltaic power generation parameter of the air conditioner, and a temperature of a rectifier module of an inverter of the air conditioner, and performing a first control on the temperature of the inverter of the air conditioner according to the power consumption parameter, the photovoltaic power generation parameter, and the temperature of the rectifier module. The power consumption parameters of the air conditioner may include: the power consumption increasing rate of a compressor of the air conditioner, the current change rate of the compressor of the air conditioner and the like; the photovoltaic power generation parameters of the air conditioner can comprise: the photovoltaic power generation power rising rate of the air conditioner, the photovoltaic power generation current change rate of the air conditioner and the like. That is, the state conditions of the power consumption increasing rate of the compressor of the unit air conditioner and the photovoltaic power generation increasing rate can also be replaced by the detected current changing rate value.
Optionally, in step S120, a specific process of performing a first control on the temperature of the inverter of the air conditioner according to the power consumption parameter, the photovoltaic power generation parameter, and the temperature of the rectifier module may be referred to as the following exemplary description.
The following further describes a specific process of performing the first control on the temperature of the inverter of the air conditioner in step S120 with reference to a schematic flow chart of an embodiment of performing the first control on the temperature of the inverter of the air conditioner in the method of the present invention shown in fig. 2, and may include: step S210 and step S220.
Step S210, determining the rising rate of the power consumption parameter of the air conditioner according to the power consumption parameter of the air conditioner, and determining the rising rate of the photovoltaic power generation parameter of the air conditioner according to the photovoltaic power generation parameter of the air conditioner.
Step S220, under the condition that the power consumption parameter rising rate of the air conditioner is smaller than the photovoltaic power generation parameter rising rate of the air conditioner, if the photovoltaic power generation parameter of the air conditioner is smaller than or equal to a first set parameter and the temperature of a rectification module of the frequency converter is larger than a set frequency limiting temperature, controlling the frequency converter to maintain the current frequency to run so as to limit the running frequency of the frequency converter to rise again on the basis of the current frequency; and adjusting the frequency of a compressor of the cooling device of the air conditioner according to the temperature of the rectification module. Wherein the first setting parameter is YkW.
For example: after the unit is powered on and started, the system enters an initialization detection state to detect the photovoltaic power generation power PmfAnd the power consumption P of the air conditionermp. When detecting the power consumption increasing rate Y of the air conditioner1< photovoltaic Power Generation Power rise Rate Y2And the photovoltaic power generation power PmfWhen the temperature is not more than YkW, the frequency converter rectifying module can generate a large amount of heat when the unit is started to operate, and the temperature T of the frequency converter rectifying module of the unit is lower than1Temperature T equal to or higher than frequency reductionLHour and machineThe frequency converter group adopts load limiting treatment, namely, the power consumption of the air conditioner is limited, the frequency of the current frequency converter is limited to rise, and the current frequency H is maintained1And (5) operating. Meanwhile, the frequency of the compressor of the cooling device is according to the temperature interval value T preset by the frequency converter module2The frequency modulation is specifically an ascending frequency processing to control the flow velocity of the refrigeration refrigerant in the module copper pipe.
Therefore, when the system is switched to photovoltaic large-load operation, the output power of the frequency converter is restrained in advance according to the power consumption increasing rate of the air conditioner compressor and the photovoltaic power generation condition. Therefore, the conditions of the air conditioner compressor and the photovoltaic power generation power rising rate are judged through detecting the power, the output power of the frequency converter is restrained in advance, and the temperature of a plate block of the frequency converter is prevented from rising sharply.
More optionally, in step S220, a specific process of adjusting the frequency of the compressor of the cooling device of the air conditioner according to the temperature of the rectification module may be referred to as the following exemplary description.
Referring to the flowchart of fig. 3, the specific process of adjusting the frequency of the compressor of the cooling device of the air conditioner according to the temperature of the rectification module in step S220 will be further described, where the specific process includes: step S310 to step S340.
Step S310, after the frequency converter is controlled to maintain the current frequency to operate, if the temperature of the rectifier module after the frequency converter is controlled to maintain the current frequency to operate is continuously detected to be greater than or equal to a first set temperature value in a first set time period, controlling the frequency of a compressor of cooling equipment of the air conditioner to increase by a first set frequency. Wherein a first set duration, e.g. Y1And s. The first set temperature value can be a preset temperature interval value T2Module ± 3 ℃. A first set frequency, such as (H +2) Hz.
For example: the frequency of a compressor of the cooling device is adjusted according to a temperature interval value T preset by the frequency converter module2After the frequency raising treatment is carried out, the temperature T of the current frequency converter rectifying module is continuously detected1With a continuous detection time of Y1And s. By successive Y1s detecting the currentTemperature T of rectifier module of frequency converter1E.g. current converter rectifier module temperature T1Not less than the preset temperature interval value T2And if the temperature of the module is +/-3 ℃, increasing the frequency of the compressor of the cooling equipment to (H +2) Hz, and detecting once again after 2 min.
Of course, by successive Y1s detecting the current converter rectifier module temperature T1E.g. current converter rectifier module temperature T1< Preset temperature interval value T2The temperature of the module is +/-3 ℃, and the temperature continues to be within the preset temperature interval T of the frequency converter module2And raising the frequency of the compressor of the cooling device.
Step S320, after controlling the frequency of the cooling device compressor of the air conditioner to increase by the first set frequency, if it is detected after the second set time period that the temperature of the rectification module after controlling the frequency of the cooling device compressor of the air conditioner to increase by the first set frequency is greater than or equal to the set down temperature and less than the set protection temperature, controlling the frequency converter of the air conditioner to operate by decreasing the current frequency by the second set frequency, and determining the temperature rise rate of the rectification module according to the temperature of the rectification module. Wherein the second set time period is, for example, 2 min. A second set frequency, e.g. (H)1-10)Hz。
For example: if the temperature T of the rectifier module of the frequency converter is detected again after the frequency of the compressor of the cooling equipment is increased by (H +2) Hz1Temperature T equal to or higher than frequency reductionDAt a temperature of DEG C and still meet the temperature T of frequency reductionD≤T1< protection temperature TPIn time, the frequency converter of the unit reduces the frequency (H) again1-10) Hz to reduce the power consumed by the air conditioner, and further by detecting the rate of temperature rise of the inverter module.
And step S330, if the temperature rise rate of the rectifier module is greater than or equal to the first set temperature rise rate, controlling the frequency of the compressor of the cooling equipment of the air conditioner to increase the third set frequency again. Wherein a first set rate of temperature rise, e.g. F1. And a third set frequency, such as (H +5) Hz.
For example: reducing the frequency (H) again in the unit frequency converter1-10) Hz to reduce the power consumption of the air conditioner, when the temperature rise rate T of the rectifier module is detected3≥F1(e.g., 3 deg.C/min), cooling the apparatus pressureThe frequency of the compressor is increased by (H +5) Hz, and the temperature T of the rectifier module of the frequency converter is continuously detected1。
Step S340, after the frequency of the cooling equipment compressor of the air conditioner is controlled to increase the third set frequency again, if the temperature of the rectifier module after the frequency of the cooling equipment compressor of the air conditioner is controlled to increase the third set frequency again is detected to be greater than or equal to the set temperature and less than the set frequency reduction temperature, the frequency converter of the air conditioner is controlled to maintain the frequency operation after the current frequency is reduced by the second set frequency; and if the temperature of the rectifier module is detected to be lower than the set temperature after the frequency of the compressor of the cooling equipment of the air conditioner is controlled to be increased again by the third set frequency, the frequency converter of the air conditioner is controlled to operate for the third set time period after the current frequency is reduced by the second set frequency, and then the operation load of the air conditioner is determined again so as to control the temperature again according to the operation load of the air conditioner. In which the temperature is set, e.g. TR。
For example: after the frequency of the compressor of the cooling device is increased by (H +5) Hz, if T is detectedRTemperature T of rectifier module of frequency converter1< temperature of frequency reduction TDAnd maintaining the current frequency of the frequency converter. If T is detectedRTemperature T of rectifier module of frequency converter1If the current frequency of the frequency converter is maintained for 3min, the system operates again according to the frequency calculated by the load capacity of the air conditioner compressor, and if the temperature T of the rectifier module of the frequency converter is higher than the preset temperature T, the current frequency of the frequency converter is maintained for 3min, and then the system operates again according to the frequency calculated by the load1≥TRWhen the frequency converter of the time group enters a protection zone, the machine group is stopped according to faults, and the situation that the frequency converter continuously generates heat to influence and reduce the safety and the reliability of the frequency converter is avoided.
For example: through restraining the output power of the frequency converter in advance, the temperature of the frequency converter module is controlled to rise sharply, heat in a cavity of the frequency converter is effectively reduced, the temperature of the frequency converter module can be controlled within a specific range, the temperature of the frequency converter module is prevented from being too high, and therefore the photovoltaic direct-drive frequency converter is guaranteed to operate safely and stably.
Therefore, the junction temperature of the frequency converter module is accurately adjusted by further detecting the temperature rise rate of the frequency converter module after the sharp temperature rise trend of the frequency converter module is controlled, and controlling the output power of the frequency converter according to the temperature rise rate and synchronously combining with the frequency control of a compressor of the cooling equipment.
In step S130, if the operating load of the air conditioner is the second load, the power consumption parameter of the air conditioner, the photovoltaic power generation parameter of the air conditioner, the temperature of the rectifier module of the inverter of the air conditioner, and the suction superheat degree of the compressor of the cooling device of the air conditioner are obtained, and the temperature of the inverter of the air conditioner is second controlled according to the power consumption parameter, the photovoltaic power generation parameter, the temperature rise rate of the inverter, and the suction superheat degree of the compressor.
For example: the power consumption power rising rate of an air conditioner compressor and the photovoltaic power generation power rising rate are judged through detection, the output power of a frequency converter is inhibited in advance, the temperature rising rate of a frequency converter module is further detected after the temperature of a plate of the frequency converter is controlled according to the temperature rising rate, the output power of the frequency converter is controlled according to the temperature rising rate and is synchronously combined with the frequency control of a compressor of cooling equipment, the junction temperature of the frequency converter module is accurately adjusted, when a system is switched to run under a photovoltaic small load, the suction superheat degree control of the compressor of the cooling equipment is increased, the circulation quantity of a refrigerant of the system is properly adjusted, the circulation quantity of the refrigerant is accurately controlled, supercooling and overheating adjustment are avoided, so that the safe and stable running of the photovoltaic.
Therefore, when the air conditioner runs at a first load, judging conditions such as the power consumption power rising rate of an air conditioner compressor, the photovoltaic power generation power rising rate, the temperature rising rate of the frequency converter module and the like are added, detected and judged to control the temperature of the frequency converter module, and the junction temperature of the module is adjusted in real time; when the air conditioner runs at the second load, judging conditions such as the power consumption power rising rate of an air conditioner compressor, the photovoltaic power generation power rising rate, the temperature rising rate of a frequency converter module, the rarefaction superheat degree of the compressor and the like are added to detect and judge to control the temperature of the frequency converter module, the junction temperature of the module is adjusted in real time, the temperature of the frequency converter module can be controlled within a specific range, the problem that the heat generated by the frequency converter affects the working reliability of the frequency converter can be at least solved, and the effect that the heat generated by the frequency converter is radiated to improve the working reliability of the frequency converter is achieved.
Optionally, in step S130, a specific process of performing a second control on the temperature of the inverter of the air conditioner according to the power consumption parameter, the photovoltaic power generation parameter, the temperature rise rate of the inverter, and the suction superheat degree of the compressor may be referred to as the following exemplary description.
The following further describes a specific process of performing the second control on the temperature of the inverter of the air conditioner in step S130 with reference to a flowchart of an embodiment of performing the second control on the temperature of the inverter of the air conditioner in the method of the present invention shown in fig. 4, which may include: step S410 to step S440.
And step S410, determining the rising rate of the power consumption parameter of the air conditioner according to the power consumption parameter of the air conditioner, and determining the rising rate of the photovoltaic power generation parameter of the air conditioner according to the photovoltaic power generation parameter of the air conditioner.
Step S420, if the power consumption parameter of the air conditioner is less than or equal to the second setting parameter, the power consumption parameter of the air conditioner is the setting power consumption, and the temperature of the rectifier module of the inverter is less than the second setting temperature value, controlling the frequency of the compressor of the cooling device of the air conditioner to decrease the fourth setting frequency. Wherein the second setting parameter is, for example, 5 kW. A second set temperature value, e.g. a preset temperature interval value T2Module ± 3 ℃. And a fourth set frequency, such as 3 Hz.
For example: when the photovoltaic power generation power rising rate Y is detected2Rate of increase of power consumption of air conditioner1And, photovoltaic power generation power PmfLess than or equal to 5kW and power consumption P of air conditionermpWhen the power is equal to 0, the unit is in a pure photovoltaic working state. When the frequency converter rectifying module generates extremely small heat, the temperature of the cooling plate of the frequency converter is suddenly reduced, and the current temperature T of the frequency converter rectifying module is detected1Less than or equal to a preset temperature interval value T2And when the temperature of the module is +/-3 ℃, the frequency of a compressor of the cooling equipment is reduced by 3 Hz.
Step S430, after the frequency of the cooling device compressor of the air conditioner is controlled to decrease by the fourth set frequency, if it is detected after the fourth set time period that the temperature of the rectifier module after the frequency of the cooling device compressor of the air conditioner is controlled to decrease by the fourth set frequency is still less than the second set temperature value, determining a temperature decrease rate of the rectifier module according to the temperature of the rectifier module. Wherein the fourth set time period is, for example, 2 min.
For example: after the frequency of the compressor of the cooling equipment is reduced by 3Hz, the detection is carried out again after 2min, if T is still met1≤T2When the temperature of the module is +/-3 ℃, the temperature drop rate of the frequency converter module is further detected.
And step S440, if the temperature drop rate of the rectifier module is greater than or equal to the second set temperature rise rate, controlling the frequency of the compressor of the cooling equipment of the air conditioner to reduce the fifth set frequency again, and controlling the refrigerant circulation quantity of the cooling equipment of the air conditioner according to the suction superheat degree of the compressor of the air conditioner. Wherein a second set rate of temperature rise, e.g. F2. And a fifth set frequency, such as 3 Hz.
For example: after the temperature drop rate of the frequency converter module is detected, when the temperature drop rate T of the rectifier module is detected4The temperature interval value F is not less than the preset temperature interval value F of the frequency converter module2(e.g. 3 deg.C/min), the compressor frequency is continuously reduced by 3Hz, and the operation of the frequency is maintained according to the rule until the compressor frequency is reduced to the lowest frequency.
Therefore, when the system is switched to photovoltaic low-load operation, the suction superheat degree control of a compressor of the cooling device is increased, the circulation quantity of a system refrigerant is properly adjusted, the circulation quantity of the system refrigerant is accurately controlled, supercooling and overheating adjustment are avoided, the safe and stable operation of the photovoltaic direct-drive frequency converter is guaranteed, and meanwhile the reliability of the cooling device is improved.
More alternatively, the specific process of controlling the refrigerant circulation amount of the cooling device of the air conditioner according to the suction superheat of the compressor of the air conditioner in step S440 may be referred to the following exemplary description.
Referring to fig. 5, a flowchart illustrating an embodiment of controlling a refrigerant circulation amount of a cooling device of an air conditioner according to a suction superheat of a compressor of the air conditioner in the method of the present invention further illustrates a specific process of controlling the refrigerant circulation amount of the cooling device of the air conditioner according to the suction superheat of the compressor of the air conditioner in step S440, which may include: step S510 and step S520.
Step S510, after controlling the compressor frequency of the cooling device of the air conditioner to decrease the fifth set frequency againIf the temperature of the rectifier module after the frequency of the cooling equipment compressor of the air conditioner is controlled to be reduced by the fifth set frequency again is detected to be less than or equal to the third set temperature value and the suction superheat degree of the compressor of the air conditioner is detected to be less than or equal to the power consumption parameter increasing rate of the air conditioner, the frequency of the cooling equipment compressor of the air conditioner is controlled to continue to be reduced by the fifth set frequency until the frequency of the cooling equipment compressor of the air conditioner is reduced to the set lowest frequency, the frequency of the cooling equipment compressor of the air conditioner is controlled to maintain the set lowest frequency to operate, and the refrigerant circulation quantity of the cooling equipment. Wherein the third set temperature value, such as the preset temperature interval value T2Module ± 5 ℃.
For example: after the compressor is controlled to operate at the lowest frequency, the flow rate of a refrigerating refrigerant in the module copper pipe is controlled, and the suction superheat degree Q of the compressor of the cooling device is controlledtDetecting when the suction superheat Q of the compressor is detectedtPower consumption increasing rate Y less than or equal to air conditioner1DEG C and the current temperature T of the rectifier module of the frequency converter1Less than or equal to a preset temperature interval value T2And when the temperature of the module is +/-5 ℃, the exhaust superheat degree control mode is preferentially entered.
And step S520, if the suction superheat degree of the compressor of the air conditioner is larger than the power consumption parameter increasing rate of the air conditioner, controlling the cooling equipment of the air conditioner to maintain the adjusted refrigerant circulation quantity to operate.
For example: in the exhaust superheat degree control mode, the opening degree of an electronic expansion valve EXV is controlled, the circulation quantity of a system refrigerant is properly adjusted, and the suction superheat degree Q is ensuredtRate of increase of power consumption of air conditioner1The opening degree of the current electronic expansion valve EXV is maintained after the temperature is higher than the preset value, and the problems of condensation and liquid return of cooling equipment caused by supercooling are avoided.
Therefore, under the condition that the system switches photovoltaic low-load operation, the suction superheat degree of a compressor of the cooling equipment is increased, the circulation quantity of a system refrigerant is properly adjusted, and the quantity of liquid refrigerant sucked by the compressor is reduced, so that the long-term reliable operation of the cooling equipment is ensured.
Through a large amount of tests verification, adopt the technical scheme of this embodiment, judge the air condition compressor and the photovoltaic power generation power rate of rise condition through the detected power, restrain the converter output power size in advance, can avoid converter plate temperature to gather suddenly and rise, be favorable to promoting the reliability of converter self work.
According to an embodiment of the present invention, there is also provided a temperature control apparatus corresponding to the temperature control method. Referring to fig. 6, a schematic diagram of an embodiment of the apparatus of the present invention is shown. This temperature control device can be applied to the control that photovoltaic directly drives inverter air conditioner machine and carries converter cooling temperature, and photovoltaic directly drives inverter air conditioner machine and carries the temperature control device of converter, can include: a determination unit 102 and a control unit 104.
In an alternative example, the determining unit 102 may be configured to determine an operation load of the air conditioner. The operation load of the air conditioner may include: a first load or a second load, the first load being greater than the second load. For example: the first load is a photovoltaic large load, and the second load is a photovoltaic small load. The specific function and processing of the determination unit 102 are referred to in step S110.
In an optional example, the control unit 104 may be configured to, if the operating load of the air conditioner is the first load, obtain a power consumption parameter of the air conditioner, a photovoltaic power generation parameter of the air conditioner, and a temperature of a rectifier module of an inverter of the air conditioner, and perform first control on the temperature of the inverter of the air conditioner according to the power consumption parameter, the photovoltaic power generation parameter, and the temperature of the rectifier module. The specific function and processing of the control unit 104 are referred to in step S120. The power consumption parameters of the air conditioner may include: the power consumption increasing rate of a compressor of the air conditioner, the current change rate of the compressor of the air conditioner and the like; the photovoltaic power generation parameters of the air conditioner can comprise: the photovoltaic power generation power rising rate of the air conditioner, the photovoltaic power generation current change rate of the air conditioner and the like. That is, the state conditions of the power consumption increasing rate of the compressor of the unit air conditioner and the photovoltaic power generation increasing rate can also be replaced by the detected current changing rate value.
Optionally, the controlling unit 104 performs a first control on the temperature of the inverter of the air conditioner according to the power consumption parameter, the photovoltaic power generation parameter, and the temperature of the rectifier module, and may include:
the control unit 104 may be further specifically configured to determine a power consumption parameter increase rate of the air conditioner according to the power consumption parameter of the air conditioner, and determine a photovoltaic power generation parameter increase rate of the air conditioner according to the photovoltaic power generation parameter of the air conditioner. The specific functions and processing of the control unit 104 are also referred to in step S210.
The control unit 104 may be further configured to, when the power consumption parameter increase rate of the air conditioner is less than the photovoltaic power generation parameter increase rate of the air conditioner, control the frequency converter to maintain the current frequency operation if the photovoltaic power generation parameter of the air conditioner is less than or equal to the first set parameter and the temperature of the rectifier module of the frequency converter is greater than the set limit frequency temperature, so as to limit the operation frequency of the frequency converter to increase again on the basis of the current frequency; and adjusting the frequency of a compressor of the cooling device of the air conditioner according to the temperature of the rectification module. The specific functions and processes of the control unit 104 are also referred to in step S220. Wherein the first setting parameter is YkW.
For example: after the unit is powered on and started, the system enters an initialization detection state to detect the photovoltaic power generation power PmfAnd the power consumption P of the air conditionermp. When detecting the power consumption increasing rate Y of the air conditioner1< photovoltaic Power Generation Power rise Rate Y2And the photovoltaic power generation power PmfWhen the temperature is not more than YkW, the frequency converter rectifying module can generate a large amount of heat when the unit is started to operate, and the temperature T of the frequency converter rectifying module of the unit is lower than1Temperature T equal to or higher than frequency reductionLIn time, the frequency converter of the unit adopts load limiting treatment, namely, the power consumed by the running of the air conditioner is limited, the current frequency of the frequency converter is limited to rise, and the existing frequency H is maintained1And (5) operating. Meanwhile, the frequency of the compressor of the cooling device is according to the temperature interval value T preset by the frequency converter module2The frequency modulation is specifically an ascending frequency processing to control the flow velocity of the refrigeration refrigerant in the module copper pipe.
Therefore, when the system is switched to photovoltaic large-load operation, the output power of the frequency converter is restrained in advance according to the power consumption increasing rate of the air conditioner compressor and the photovoltaic power generation condition. Therefore, the conditions of the air conditioner compressor and the photovoltaic power generation power rising rate are judged through detecting the power, the output power of the frequency converter is restrained in advance, and the temperature of a plate block of the frequency converter is prevented from rising sharply.
More optionally, the controlling unit 104 adjusts the frequency of the cooling device compressor of the air conditioner according to the temperature of the rectification module, and may include:
the control unit 104 may be further configured to, after controlling the inverter to maintain the current frequency to operate, if it is continuously detected within a first set time period that the temperature of the rectifier module after controlling the inverter to maintain the current frequency to operate is greater than or equal to a first set temperature value, control the frequency of the compressor of the cooling device of the air conditioner to increase by the first set frequency. The specific functions and processing of the control unit 104 are also referred to in step S310. Wherein a first set duration, e.g. Y1And s. The first set temperature value can be a preset temperature interval value T2Module ± 3 ℃. A first set frequency, such as (H +2) Hz.
For example: the frequency of a compressor of the cooling device is adjusted according to a temperature interval value T preset by the frequency converter module2After the frequency raising treatment is carried out, the temperature T of the current frequency converter rectifying module is continuously detected1With a continuous detection time of Y1And s. By successive Y1s detecting the current converter rectifier module temperature T1E.g. current converter rectifier module temperature T1Not less than the preset temperature interval value T2And if the temperature of the module is +/-3 ℃, increasing the frequency of the compressor of the cooling equipment to (H +2) Hz, and detecting once again after 2 min.
Of course, by successive Y1s detecting the current converter rectifier module temperature T1E.g. current converter rectifier module temperature T1< Preset temperature interval value T2The temperature of the module is +/-3 ℃, and the temperature continues to be within the preset temperature interval T of the frequency converter module2And raising the frequency of the compressor of the cooling device.
The control unit 104 may be further configured to, after controlling the frequency of the cooling device compressor of the air conditioner to increase by the first set frequency, if it is detected after the second set duration that the temperature of the rectification module after controlling the frequency of the cooling device compressor of the air conditioner to increase by the first set frequency is greater than or equal to the set down frequency temperature and is less than the set protection temperature, control the inverter of the air conditioner to operate by decreasing the current frequency by the second set frequency, and determine that the rectification module temperature is greater than or equal to the set protection temperatureFlow module temperature rise rate. The specific functions and processing of the control unit 104 are also referred to in step S320. Wherein the second set time period is, for example, 2 min. A second set frequency, e.g. (H)1-10)Hz。
For example: if the temperature T of the rectifier module of the frequency converter is detected again after the frequency of the compressor of the cooling equipment is increased by (H +2) Hz1Temperature T equal to or higher than frequency reductionDAt a temperature of DEG C and still meet the temperature T of frequency reductionD≤T1< protection temperature TPIn time, the frequency converter of the unit reduces the frequency (H) again1-10) Hz to reduce the power consumed by the air conditioner, and further by detecting the rate of temperature rise of the inverter module.
The control unit 104 may be further configured to control the frequency of the compressor of the cooling device of the air conditioner to increase again by a third set frequency if the temperature rise rate of the rectifier module is greater than or equal to the first set temperature rise rate. The specific functions and processing of the control unit 104 are also referred to in step S330. Wherein a first set rate of temperature rise, e.g. F1. And a third set frequency, such as (H +5) Hz.
For example: reducing the frequency (H) again in the unit frequency converter1-10) Hz to reduce the power consumption of the air conditioner, when the temperature rise rate T of the rectifier module is detected3≥F1(e.g. 3 ℃/min), increasing the frequency of the compressor of the cooling equipment by (H +5) Hz, and continuously detecting the temperature T of the rectifier module of the frequency converter1。
The control unit 104 may be further configured to, after controlling the frequency of the cooling device compressor of the air conditioner to increase again by the third set frequency, if it is detected that the temperature of the rectifier module after controlling the frequency of the cooling device compressor of the air conditioner to increase again by the third set frequency is greater than or equal to the set temperature and is less than the set down temperature, control the inverter of the air conditioner to maintain the frequency operation after the current frequency is decreased by the second set frequency. And if the temperature of the rectifier module is detected to be lower than the set temperature after the frequency of the compressor of the cooling equipment of the air conditioner is controlled to be increased again by the third set frequency, the frequency converter of the air conditioner is controlled to operate for the third set time period after the current frequency is reduced by the second set frequency, and then the operation load of the air conditioner is determined again so as to control the temperature again according to the operation load of the air conditioner. Control sheetThe detailed functions and processing of the element 104 are also referred to in step S340. In which the temperature is set, e.g. TR。
For example: after the frequency of the compressor of the cooling device is increased by (H +5) Hz, if T is detectedRTemperature T of rectifier module of frequency converter1< temperature of frequency reduction TDAnd maintaining the current frequency of the frequency converter. If T is detectedRTemperature T of rectifier module of frequency converter1If the current frequency of the frequency converter is maintained for 3min, the system operates again according to the frequency calculated by the load capacity of the air conditioner compressor, and if the temperature T of the rectifier module of the frequency converter is higher than the preset temperature T, the current frequency of the frequency converter is maintained for 3min, and then the system operates again according to the frequency calculated by the load1≥TRWhen the frequency converter of the time group enters a protection zone, the machine group is stopped according to faults, and the situation that the frequency converter continuously generates heat to influence and reduce the safety and the reliability of the frequency converter is avoided.
For example: through restraining the output power of the frequency converter in advance, the temperature of the frequency converter module is controlled to rise sharply, heat in a cavity of the frequency converter is effectively reduced, the temperature of the frequency converter module can be controlled within a specific range, the temperature of the frequency converter module is prevented from being too high, and therefore the photovoltaic direct-drive frequency converter is guaranteed to operate safely and stably.
Therefore, the junction temperature of the frequency converter module is accurately adjusted by further detecting the temperature rise rate of the frequency converter module after the sharp temperature rise trend of the frequency converter module is controlled, and controlling the output power of the frequency converter according to the temperature rise rate and synchronously combining with the frequency control of a compressor of the cooling equipment.
In an optional example, the control unit 104 may be further configured to, if the operating load of the air conditioner is the second load, obtain a power consumption parameter of the air conditioner, a photovoltaic power generation parameter of the air conditioner, a temperature of a rectifier module of an inverter of the air conditioner, and a compressor suction superheat degree of cooling equipment of the air conditioner, and perform second control on the inverter temperature of the air conditioner according to the power consumption parameter, the photovoltaic power generation parameter, an inverter temperature rise rate, and the compressor suction superheat degree. The specific functions and processing of the control unit 104 are also referred to in step S130.
For example: the power consumption power rising rate of an air conditioner compressor and the photovoltaic power generation power rising rate are judged through detection, the output power of a frequency converter is inhibited in advance, the temperature rising rate of a frequency converter module is further detected after the temperature of a plate of the frequency converter is controlled according to the temperature rising rate, the output power of the frequency converter is controlled according to the temperature rising rate and is synchronously combined with the frequency control of a compressor of cooling equipment, the junction temperature of the frequency converter module is accurately adjusted, when a system is switched to run under a photovoltaic small load, the suction superheat degree control of the compressor of the cooling equipment is increased, the circulation quantity of a refrigerant of the system is properly adjusted, the circulation quantity of the refrigerant is accurately controlled, supercooling and overheating adjustment are avoided, so that the safe and stable running of the photovoltaic.
Therefore, when the air conditioner runs at a first load, judging conditions such as the power consumption power rising rate of an air conditioner compressor, the photovoltaic power generation power rising rate, the temperature rising rate of the frequency converter module and the like are added, detected and judged to control the temperature of the frequency converter module, and the junction temperature of the module is adjusted in real time; when the air conditioner runs at the second load, judging conditions such as the power consumption power rising rate of an air conditioner compressor, the photovoltaic power generation power rising rate, the temperature rising rate of a frequency converter module, the rarefaction superheat degree of the compressor and the like are added to detect and judge to control the temperature of the frequency converter module, the junction temperature of the module is adjusted in real time, the temperature of the frequency converter module can be controlled within a specific range, the problem that the heat generated by the frequency converter affects the working reliability of the frequency converter can be at least solved, and the effect that the heat generated by the frequency converter is radiated to improve the working reliability of the frequency converter is achieved.
Optionally, the second controlling, by the control unit 104, the temperature of the inverter of the air conditioner according to the power consumption parameter, the photovoltaic power generation parameter, the temperature rise rate of the inverter, and the suction superheat degree of the compressor, may include:
the control unit 104 may be further specifically configured to determine a power consumption parameter increase rate of the air conditioner according to the power consumption parameter of the air conditioner, and determine a photovoltaic power generation parameter increase rate of the air conditioner according to the photovoltaic power generation parameter of the air conditioner. The specific functions and processing of the control unit 104 are also referred to in step S410.
The control unit 104 may be further configured to, if the power consumption parameter of the air conditioner is less than or equal to the second setting parameter, determine that the power consumption parameter of the air conditioner is less than the photovoltaic power generation parameter of the air conditionerAnd if the power consumption parameter of the air conditioner is the set power consumption and the temperature of the rectifier module of the frequency converter is lower than the second set temperature value, controlling the frequency of a compressor of cooling equipment of the air conditioner to reduce the fourth set frequency. The specific functions and processing of the control unit 104 are also referred to in step S420. Wherein the second setting parameter is, for example, 5 kW. A second set temperature value, e.g. a preset temperature interval value T2Module ± 3 ℃. And a fourth set frequency, such as 3 Hz.
For example: when the photovoltaic power generation power rising rate Y is detected2Rate of increase of power consumption of air conditioner1And, photovoltaic power generation power PmfLess than or equal to 5kW and power consumption P of air conditionermpWhen the power is equal to 0, the unit is in a pure photovoltaic working state. When the frequency converter rectifying module generates extremely small heat, the temperature of the cooling plate of the frequency converter is suddenly reduced, and the current temperature T of the frequency converter rectifying module is detected1Less than or equal to a preset temperature interval value T2And when the temperature of the module is +/-3 ℃, the frequency of a compressor of the cooling equipment is reduced by 3 Hz.
The control unit 104 may be further configured to determine a rectifier module temperature reduction rate according to the rectifier module temperature if it is detected that the rectifier module temperature after the frequency of the cooling device compressor of the air conditioner is reduced by the fourth set frequency after the fourth set time is elapsed after the frequency of the cooling device compressor of the air conditioner is reduced by the fourth set frequency is still less than the second set temperature value. The specific functions and processing of the control unit 104 are also referred to in step S430. Wherein the fourth set time period is, for example, 2 min.
For example: after the frequency of the compressor of the cooling equipment is reduced by 3Hz, the detection is carried out again after 2min, if T is still met1≤T2When the temperature of the module is +/-3 ℃, the temperature drop rate of the frequency converter module is further detected.
The control unit 104 may be further configured to control the frequency of the compressor of the cooling device of the air conditioner to decrease the fifth set frequency again if the temperature decrease rate of the rectifier module is greater than or equal to the second set temperature increase rate, and control the refrigerant circulation amount of the cooling device of the air conditioner according to the suction superheat degree of the compressor of the air conditioner. The specific functions and processing of the control unit 104 are also referred to in step S440. Wherein a second set rate of temperature rise, e.g. F2. And a fifth set frequency, such as 3 Hz.
For example: after the temperature drop rate of the frequency converter module is detected, when the temperature drop rate T of the rectifier module is detected4The temperature interval value F is not less than the preset temperature interval value F of the frequency converter module2(e.g. 3 deg.C/min), the compressor frequency is continuously reduced by 3Hz, and the operation of the frequency is maintained according to the rule until the compressor frequency is reduced to the lowest frequency.
Therefore, when the system is switched to photovoltaic low-load operation, the suction superheat degree control of a compressor of the cooling device is increased, the circulation quantity of a system refrigerant is properly adjusted, the circulation quantity of the system refrigerant is accurately controlled, supercooling and overheating adjustment are avoided, the safe and stable operation of the photovoltaic direct-drive frequency converter is guaranteed, and meanwhile the reliability of the cooling device is improved.
More alternatively, the controlling unit 104 may control the refrigerant circulation amount of the cooling device of the air conditioner according to the suction superheat of the compressor of the air conditioner, and may include:
the control unit 104 may be further configured to, after controlling the frequency of the cooling device compressor of the air conditioner to decrease the fifth setting frequency again, if it is detected that the temperature of the rectifier module after controlling the frequency of the cooling device compressor of the air conditioner to decrease the fifth setting frequency again is less than or equal to a third setting temperature value and the degree of superheat of air sucked by the compressor of the air conditioner is less than or equal to the increase rate of the power consumption parameter of the air conditioner, control the frequency of the cooling device compressor of the air conditioner to continue to decrease the fifth setting frequency until the frequency of the cooling device compressor of the air conditioner decreases to a set minimum frequency, control the frequency of the cooling device compressor of the air conditioner to maintain the operation at the set minimum frequency, and adjust the refrigerant. The specific functions and processing of the control unit 104 are also referred to in step S510. Wherein the third set temperature value, such as the preset temperature interval value T2Module ± 5 ℃.
For example: after the compressor is controlled to operate at the lowest frequency, the flow rate of a refrigerating refrigerant in the module copper pipe is controlled, and the suction superheat degree Q of the compressor of the cooling device is controlledtDetecting when the suction superheat Q of the compressor is detectedtPower consumption increasing rate Y less than or equal to air conditioner1DEG C and the current temperature of the rectifier module of the frequency converterT1Less than or equal to a preset temperature interval value T2And when the temperature of the module is +/-5 ℃, the exhaust superheat degree control mode is preferentially entered.
The control unit 104 may be further configured to control the cooling device of the air conditioner to maintain the adjusted refrigerant circulation amount to operate if the suction superheat degree of the compressor of the air conditioner is greater than the power consumption parameter increase rate of the air conditioner. The specific functions and processes of the control unit 104 are also referred to in step S520.
For example: in the exhaust superheat degree control mode, the opening degree of an electronic expansion valve EXV is controlled, the circulation quantity of a system refrigerant is properly adjusted, and the suction superheat degree Q is ensuredtRate of increase of power consumption of air conditioner1The opening degree of the current electronic expansion valve EXV is maintained after the temperature is higher than the preset value, and the problems of condensation and liquid return of cooling equipment caused by supercooling are avoided.
Therefore, under the condition that the system switches photovoltaic low-load operation, the suction superheat degree of a compressor of the cooling equipment is increased, the circulation quantity of a system refrigerant is properly adjusted, and the quantity of liquid refrigerant sucked by the compressor is reduced, so that the long-term reliable operation of the cooling equipment is ensured.
Since the processes and functions implemented by the apparatus of this embodiment substantially correspond to the embodiments, principles and examples of the method shown in fig. 1 to 5, the description of this embodiment is not detailed, and reference may be made to the related descriptions in the foregoing embodiments, which are not repeated herein.
Through a large number of tests, the technical scheme of the invention is adopted, after the sharp temperature rise trend of the frequency converter module is controlled, the output power of the frequency converter is controlled according to the temperature rise rate, and the frequency control of the compressor of the cooling equipment is synchronously combined, so that the junction temperature of the frequency converter module can be accurately regulated, and the heat generated by the frequency converter is prevented from influencing the working reliability of the frequency converter.
According to the embodiment of the invention, an air conditioner corresponding to the temperature control device is also provided. The air conditioner may include: the temperature control device described above.
The cooling and heat dissipation modes of some photovoltaic frequency converter modules can transmit the photovoltaic cooling equipment to control the refrigerant to flow in the copper tube in the module by detecting the temperature of the module, and directly absorb the heat of the frequency converter for heat dissipation. However, the heat dissipation mode cannot respond to the rapid change of photovoltaic voltage and the dynamic demand of the air conditioner compressor load in real time, and when the system switches to photovoltaic heavy load operation, the temperature of the cooling plate can rise sharply due to the large switching frequency of the frequency converter; because the refrigerant quantity is controlled through temperature detection, and the temperature sensor performs data acquisition every few seconds, the temperature detection has lag, only the average temperature of the frequency converter module can be obtained, the real-time transient temperature of the frequency converter module cannot be obtained, the temperature of the cooling plate cannot be controlled within a specific range, the heat in the cavity of the frequency converter cannot be effectively reduced, and the performance of the frequency converter is influenced due to overhigh temperature; in addition, when the system switches photovoltaic low-load operation, the temperature of the cooling plate is sharply reduced, condensation and cooling equipment liquid return problems are easily caused by supercooling, and the frequency converter module is short-circuited and burned out due to condensation water; also, the supercooling regulation causes a liquid return, affecting the cooling apparatus reliability.
The reliability of the working of the frequency converter can be greatly influenced by the quality of a heat dissipation system of the frequency converter, namely the safety and stability of the frequency converter cannot be ensured in the process of working for a long time. In the working process of the frequency converter, the current loss of the current devices causes the current devices to generate heat continuously, the current devices belong to temperature sensitive devices, the switching process of the current devices is easily affected by temperature change, and the reliability of the frequency converter is greatly reduced.
The operating condition of the photovoltaic direct-drive frequency converter is more and more complicated, and the output power change of the frequency converter is influenced by the rapid change of the photovoltaic voltage; and the fluctuation of the junction temperature of the frequency converter module is changed along with the change of the output power of the frequency converter. Therefore, it is necessary to adjust the junction temperature of the module in real time according to the variation of the output power of the frequency converter.
In an optional embodiment, the invention provides a cooling and temperature control system and method for an onboard frequency converter of a photovoltaic direct-drive variable frequency air conditioner.
Optionally, in the solution of the present invention, when the system switches to the photovoltaic high-load operation, the output power of the inverter is suppressed in advance according to the power consumption power increasing rate of the air conditioner compressor and the photovoltaic power generation power condition. Therefore, the conditions of the air conditioner compressor and the photovoltaic power generation power rising rate are judged through detecting the power, the output power of the frequency converter is restrained in advance, and the temperature of a plate block of the frequency converter is prevented from rising sharply.
Further, after the sharp-rise trend of the temperature of the frequency converter module is controlled, the temperature rise rate of the frequency converter module is detected, the output power of the frequency converter is controlled according to the temperature rise rate, and the junction temperature of the frequency converter module is accurately adjusted by combining the frequency control of a compressor of the cooling device. Therefore, the temperature rise and temperature drop rate of the frequency converter module is detected, the output power of the frequency converter is controlled to be synchronously combined with the frequency control of the compressor of the cooling equipment, and the junction temperature of the frequency converter module is accurately adjusted.
Optionally, in the scheme of the invention, when the system is switched to photovoltaic low-load operation, the suction superheat control of a compressor of the cooling device is increased, the circulation quantity of a system refrigerant is properly adjusted, and the circulation quantity of the refrigerant is accurately controlled to avoid supercooling and overheating adjustment, so that the safe and stable operation of the photovoltaic direct-drive frequency converter is ensured, and the reliability of the cooling device is improved. That is to say, when the system switches the photovoltaic small load operation, increase the compressor of cooling device and inhale the superheat degree control, moderate degree adjusting system refrigerant circulation volume reduces the compressor and inhales liquid refrigerant volume and then guarantees the long-term reliable operation of cooling device.
In an alternative embodiment, reference may be made to the examples shown in fig. 7 and 8 to illustrate specific implementation procedures of the scheme of the present invention.
Fig. 7 is a schematic structural diagram of an embodiment of an air conditioner according to the present invention.
In fig. 7, the photovoltaic panels can convert solar energy into electric energy, the convergence unit collects the energy of the photovoltaic panels together, the electric energy converted by the photovoltaic panels drives the air conditioner main unit air conditioner compressor to refrigerate through the frequency converter, so that power is provided for the air conditioner main unit, and the main unit can also generate power to a power grid through the frequency converter when the main unit does not work or the power generation is surplus, so that the direct driving effect of photovoltaic energy conversion is achieved, in the conversion process, the frequency converter can generate a large amount of heat and needs to dissipate heat and cool through the photovoltaic cooling equipment.
The invention belongs to the technical field of cooling equipment control, and discloses a control system, a control method and an application of a photovoltaic direct-drive variable frequency air conditioner cooling equipment, wherein solar energy is converted into electric energy, the energy of a plurality of photovoltaic panels is collected together, and the converted electric energy drives an air conditioner main machine air conditioner compressor to refrigerate; in the conversion process, the frequency converter can generate heat, and the photovoltaic cooling equipment is adopted for heat dissipation and cooling; the power consumption power rising rate of an air conditioner compressor and the photovoltaic power generation power rising rate are judged through detection, the output power of a frequency converter is inhibited in advance, the temperature rising rate of a frequency converter module is further detected after the temperature of a plate of the frequency converter is controlled according to the temperature rising rate, the output power of the frequency converter is controlled according to the temperature rising rate and is synchronously combined with the frequency control of a compressor of cooling equipment, the junction temperature of the frequency converter module is accurately adjusted, when a system is switched to run under a photovoltaic small load, the suction superheat degree control of the compressor of the cooling equipment is increased, the circulation quantity of a refrigerant of the system is properly adjusted, the circulation quantity of the refrigerant is accurately controlled, supercooling and overheating adjustment are avoided, so that the safe and stable running of the photovoltaic.
That is to say, according to the scheme of the invention, the temperature of the frequency converter module is controlled by adding the judgment conditions of detecting and judging the power consumption power rising rate of the air conditioner compressor, the photovoltaic power generation power rising rate, the temperature rising rate of the frequency converter module and the like, the module junction temperature (namely the surface temperature of the substrate inside the module) is regulated in real time, the temperature of the frequency converter module can be controlled within a specific range, and the problem that the heat generated by the frequency converter affects the working reliability of the frequency converter can be at least solved, so that the effect of radiating the heat generated by the frequency converter to improve the working reliability of the frequency converter is achieved.
Fig. 8 is a control flow diagram of an embodiment of an air conditioner according to the present invention.
In FIG. 8, PmfFor photovoltaic power generation, PmpConsuming power for air-conditioning, Y1For the air conditioner, the power consumption rate is Y1Detecting the power consumption in the period/the current period before 1min and Y is 30kW/min2For photovoltaic power generation power rising rate, power generation powerRate of rise of Y2Detecting the periodic generating power/the current periodic generating power before 1min for +30kW/min1For the current converter rectifier module temperature, T2Temperature interval value, T, preset for frequency converter module3Is the temperature rise rate, T, of the rectifier module4Is the temperature drop rate of the rectifier module, TLIs the frequency limiting temperature (DEG C), TDThe temperature of frequency reduction (DEG C), TPFor protection temperature (. degree. C.), QtThe superheat degree of the compressor exhaust gas of the cooling device is shown.
Referring to the example shown in fig. 8, after the unit is powered on and started, the system enters an initialization detection state to detect the photovoltaic power generation power PmfAnd the power consumption P of the air conditionermpWhen detecting the power consumption power rising rate Y of the air conditioner1< detection of photovoltaic Power Generation Power rise Rate Y2And photovoltaic power generation power PmfWhen the power is not more than YkW, the photovoltaic high-load operation is carried out, after the unit is powered on and started, the system enters an initialization state, and when the rising rate Y of the photovoltaic power generation power is detected2Rate of increase of power consumption of air conditioner1And photovoltaic power generation power PmfLess than or equal to 5kW and power consumption P of air conditionermpWhen the load is 0, the photovoltaic power generation device is operated under a small load.
Referring to the example shown in fig. 8, for two cases of photovoltaic large-load operation and photovoltaic small-load operation, a cooling temperature control process of the onboard frequency converter of the photovoltaic direct-drive variable frequency air conditioner may include:
step 10, after the unit is powered on and started, the system enters an initialization detection state to detect the photovoltaic power generation power PmfAnd the power consumption P of the air conditionermpStep 20 or step 30 is executed.
Step 20, when detecting the rising rate Y of the power consumption of the air conditioner1< photovoltaic Power Generation Power rise Rate Y2And the photovoltaic power generation power PmfWhen the temperature is not more than YkW, the frequency converter rectifying module can generate a large amount of heat when the unit is started to operate, and the temperature T of the frequency converter rectifying module of the unit is lower than1Temperature T equal to or higher than frequency reductionLThen, step 21 to step 25 are executed.
Step 21, the frequency converter of the unit adopts load limiting treatment, namely, the power consumption of the air conditioner is limited, and the frequency of the current frequency converter is limitedRaise and maintain the current frequency H1And (5) operating. Meanwhile, the frequency of the compressor of the cooling device is according to the temperature interval value T preset by the frequency converter module2The frequency modulation is specifically an ascending frequency processing to control the flow velocity of the refrigeration refrigerant in the module copper pipe.
Step 22, continuously detecting the temperature T of the current frequency converter rectification module1With a continuous detection time of Y1And s. By successive Y1s detecting the current converter rectifier module temperature T1E.g. current converter rectifier module temperature T1Not less than the preset temperature interval value T2And if the temperature of the module is +/-3 ℃, increasing the frequency of the compressor of the cooling equipment to (H +2) Hz, and detecting once again after 2 min.
Of course, by successive Y1s detecting the current converter rectifier module temperature T1E.g. current converter rectifier module temperature T1< Preset temperature interval value T2The temperature of the module is +/-3 ℃, and the temperature continues to be within the preset temperature interval T of the frequency converter module2And raising the frequency of the compressor of the cooling device.
Step 23, if the temperature T of the rectifier module of the frequency converter is detected again1Temperature T equal to or higher than frequency reductionDAt a temperature of DEG C and still meet the temperature T of frequency reductionD≤T1< protection temperature TPIn time, the frequency converter of the unit reduces the frequency (H) again1-10) Hz to reduce the power consumed by the air conditioner, and further by detecting the rate of temperature rise of the inverter module.
Step 24, when the temperature rise rate T of the rectifier module is detected3≥F1(e.g. 3 ℃/min), increasing the frequency of the compressor of the cooling equipment by (H +5) Hz, and continuously detecting the temperature T of the rectifier module of the frequency converter1。
Step 25, if the protection temperature T of the frequency converter module is detectedRTemperature T of rectifier module of frequency converter1< temperature of frequency reduction TDAnd maintaining the current frequency of the frequency converter.
If T is detectedRTemperature T of rectifier module of frequency converter1If the current frequency of the frequency converter is maintained for 3min, the system operates again according to the frequency calculated by the load capacity of the air conditioner compressor, and if the temperature T of the rectifier module of the frequency converter is higher than the preset temperature T, the current frequency of the frequency converter is maintained for 3min, and then the system operates again according to the frequency calculated by the load1≥TRWhen the frequency converter of the unit enters a protection zone, the unit is shut down according to faults, so that the situation that the frequency converter continuously generates heat to influence and reduce the safety and reliability of the frequency converter is avoided; therefore, the temperature of the frequency converter module can be prevented from being too high, and the safe and stable operation of the photovoltaic direct-drive frequency converter is ensured.
Therefore, the output power of the frequency converter is restrained in advance, the sharp rising trend of the temperature of the frequency converter module is controlled, the heat in the cavity of the frequency converter is effectively reduced, the temperature of the frequency converter module can be controlled within a specific range, the temperature of the frequency converter module is prevented from being too high, and the safe and stable operation of the photovoltaic direct-drive frequency converter is guaranteed.
Step 30, when the photovoltaic power generation power rising rate Y is detected2Rate of increase of power consumption of air conditioner1And, photovoltaic power generation power PmfLess than or equal to 5kW and power consumption P of air conditionermpWhen the power is equal to 0, the unit is in a pure photovoltaic working state. When the frequency converter rectifying module generates extremely small heat, the temperature of the cooling plate of the frequency converter is suddenly reduced, and the current temperature T of the frequency converter rectifying module is detected1Less than or equal to a preset temperature interval value T2And when the temperature of the module is +/-3 ℃, executing the step 31 to the step 35.
Step 31, reducing the frequency of the compressor of the cooling equipment by 3Hz, detecting again after 2min, and if T is still met1≤T2When the temperature of the module is +/-3 ℃, the temperature drop rate of the frequency converter module is further detected.
Step 32, when the temperature drop rate T of the rectifier module is detected4The temperature interval value F is not less than the preset temperature interval value F of the frequency converter module2(e.g. 3 deg.C/min), the compressor frequency is continuously reduced by 3Hz, and the operation of the frequency is maintained according to the rule until the compressor frequency is reduced to the lowest frequency.
Step 33, controlling the flow rate of the refrigeration refrigerant in the module copper pipe, and simultaneously controlling the suction superheat degree Q of the compressor of the cooling devicetDetecting when the suction superheat Q of the compressor is detectedtPower consumption increasing rate Y less than or equal to air conditioner1DEG C and the current temperature T of the rectifier module of the frequency converter1Less than or equal to a preset temperature interval value T2When the temperature of the module is +/-5 ℃, the exhaust gas is preferentially overheatedThe degree control mode is that the opening degree of the electronic expansion valve EXV is controlled, the circulation quantity of the system refrigerant is properly adjusted, and the suction superheat degree Q is ensuredtRate of increase of power consumption of air conditioner1The opening degree of the current electronic expansion valve EXV is maintained after the temperature is higher than the preset value, and the problems of condensation and liquid return of cooling equipment caused by supercooling are avoided.
For example: when Q istPower consumption increasing rate Y less than or equal to air conditioner1Opening degree of the electronic expansion valve EXV is reduced at the temperature of DEG C, and the degree of superheat Q of the intake air is reducedtRate of increase of power consumption of air conditioner1And maintaining the opening degree of the current electronic expansion valve EXV after the temperature is higher than the preset temperature.
In the above embodiment, the power consumption increasing rate of the unit air conditioner compressor and the photovoltaic power generation increasing rate state condition may also be replaced by a detected current change rate value.
Since the processing and functions of the air conditioner of this embodiment are basically corresponding to the embodiments, principles and examples of the apparatus shown in fig. 6, the description of this embodiment is not given in detail, and reference may be made to the related descriptions in the embodiments, which are not described herein again.
Through a large number of tests, the technical scheme of the invention is adopted, and the suction superheat degree control of the compressor of the cooling equipment is increased under the condition of photovoltaic small-load operation, the refrigerant circulation quantity of the system is properly adjusted, the refrigerant circulation quantity can be accurately controlled, the supercooling and overheating adjustment is avoided, and the safe and stable operation of the photovoltaic direct-drive frequency converter is ensured.
According to an embodiment of the present invention, there is also provided a storage medium corresponding to the temperature control method. The storage medium may include: the storage medium has stored therein a plurality of instructions; the plurality of instructions are used for being loaded by a processor and executing the temperature control method.
Since the processing and functions implemented by the storage medium of this embodiment substantially correspond to the embodiments, principles, and examples of the methods shown in fig. 1 to fig. 5, details are not described in the description of this embodiment, and reference may be made to the related descriptions in the foregoing embodiments, which are not described herein again.
Through a large number of tests, the technical scheme of the invention is adopted, the power consumption power rising rate of the air conditioner compressor and the photovoltaic power generation power rising rate are detected and judged, the output power of the frequency converter is inhibited in advance, when the sharp temperature rise trend of the plate block of the frequency converter is controlled, the temperature rise rate of the frequency converter module is further detected, the output power of the frequency converter is controlled according to the temperature rise rate, the frequency control of the compressor of the cooling equipment is synchronously combined, the junction temperature of the frequency converter module is accurately regulated, and the safe and stable operation of the photovoltaic direct-driven frequency converter can be ensured.
According to the embodiment of the invention, an air conditioner corresponding to the temperature control method is also provided. The air conditioner may include: a processor for executing a plurality of instructions; a memory to store a plurality of instructions; wherein the plurality of instructions are stored by the memory and loaded and executed by the processor to perform the temperature control method described above.
Since the processing and functions of the air conditioner of this embodiment are basically corresponding to the embodiments, principles and examples of the methods shown in fig. 1 to 5, the description of this embodiment is not detailed, and reference may be made to the related descriptions in the foregoing embodiments, which are not described herein again.
Through a large number of tests, the technical scheme of the invention is adopted, the temperature of the frequency converter module is controlled by increasing the judgment conditions of detecting and judging the power consumption power rising rate of the air conditioner compressor, the photovoltaic power generation power rising rate, the temperature rising rate of the frequency converter module and the like, the junction temperature of the module is adjusted in real time, and the temperature of the frequency converter module can be controlled within a specific range so as to ensure the safe and stable operation of the photovoltaic direct-drive frequency converter.
In summary, it is readily understood by those skilled in the art that the advantageous modes described above can be freely combined and superimposed without conflict.
The above description is only an example of the present invention, and is not intended to limit the present invention, and it is obvious to those skilled in the art that various modifications and variations can be made in the present invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the scope of the claims of the present invention.

Claims (8)

1. A method of temperature control, comprising:
determining the operation load of the air conditioner; an operation load of an air conditioner, comprising: a first load or a second load, the first load being greater than the second load;
if the operation load of the air conditioner is a first load, acquiring power consumption parameters of the air conditioner, photovoltaic power generation parameters of the air conditioner and the temperature of a rectification module of a frequency converter of the air conditioner, and performing first control on the temperature of the frequency converter of the air conditioner according to the power consumption parameters, the photovoltaic power generation parameters and the temperature of the rectification module, wherein the first control comprises the following steps: determining the rising rate of the power consumption parameter of the air conditioner according to the power consumption parameter of the air conditioner, and determining the rising rate of the photovoltaic power generation parameter of the air conditioner according to the photovoltaic power generation parameter of the air conditioner; under the condition that the power consumption parameter rising rate of the air conditioner is smaller than the photovoltaic power generation parameter rising rate of the air conditioner, if the photovoltaic power generation parameter of the air conditioner is smaller than or equal to a first set parameter and the temperature of a rectification module of the frequency converter is larger than a set frequency limiting temperature, controlling the frequency converter to maintain the current frequency to operate; adjusting the frequency of a compressor of cooling equipment of the air conditioner according to the temperature of the rectification module;
if the operation load of the air conditioner is a second load, acquiring power consumption parameters of the air conditioner, photovoltaic power generation parameters of the air conditioner, the temperature of a rectifier module of a frequency converter of the air conditioner and the suction superheat degree of a compressor of cooling equipment of the air conditioner, and performing second control on the temperature of the frequency converter of the air conditioner according to the power consumption parameters, the photovoltaic power generation parameters, the temperature rise rate of the frequency converter and the suction superheat degree of the compressor, wherein the second control comprises the following steps: determining the rising rate of the power consumption parameter of the air conditioner according to the power consumption parameter of the air conditioner, and determining the rising rate of the photovoltaic power generation parameter of the air conditioner according to the photovoltaic power generation parameter of the air conditioner; under the condition that the power consumption parameter rising rate of the air conditioner is smaller than the photovoltaic power generation parameter rising rate of the air conditioner, if the photovoltaic power generation parameter of the air conditioner is smaller than or equal to a second set parameter, the power consumption parameter of the air conditioner is set power consumption, and the temperature of a rectification module of the frequency converter is smaller than a second set temperature value, controlling the frequency of a compressor of cooling equipment of the air conditioner to reduce a fourth set frequency; after controlling the frequency of a compressor of cooling equipment of the air conditioner to reduce a fourth set frequency, if the temperature of the rectifier module is detected to be still smaller than a second set temperature value after a fourth set time, determining the temperature reduction rate of the rectifier module according to the temperature of the rectifier module; and if the temperature drop rate of the rectification module is greater than or equal to the second set temperature rise rate, controlling the frequency of a compressor of the cooling equipment of the air conditioner to reduce the fifth set frequency again, and controlling the refrigerant circulation quantity of the cooling equipment of the air conditioner according to the suction superheat degree of the compressor of the air conditioner.
2. The temperature control method of claim 1, wherein adjusting a cooling device compressor frequency of an air conditioner according to a rectifier module temperature comprises:
after the frequency converter is controlled to maintain the current frequency to operate, if the temperature of the rectifier module is continuously detected to be greater than or equal to a first set temperature value within a first set time period, controlling the frequency of a compressor of cooling equipment of the air conditioner to increase by a first set frequency;
after controlling the frequency of a compressor of cooling equipment of the air conditioner to increase by a first set frequency, if detecting that the temperature of a rectification module is greater than or equal to a set frequency reduction temperature and less than a set protection temperature after a second set time, controlling a frequency converter of the air conditioner to operate by reducing the current frequency by a second set frequency, and determining the temperature rise rate of the rectification module according to the temperature of the rectification module;
if the temperature rise rate of the rectifier module is greater than or equal to the first set temperature rise rate, controlling the frequency of a compressor of cooling equipment of the air conditioner to rise to a third set frequency again;
after controlling the frequency of a compressor of cooling equipment of the air conditioner to increase the third set frequency again, if the detected temperature of the rectification module is greater than or equal to the set temperature and less than the set frequency reduction temperature, controlling a frequency converter of the air conditioner to maintain the operation of the frequency reduced by the second set frequency from the current frequency; and if the detected temperature of the rectifier module is less than the set temperature, controlling the frequency converter of the air conditioner to operate for a third set time length after the frequency of the current frequency is reduced by the second set frequency, and then re-determining the operation load of the air conditioner.
3. The temperature control method according to claim 1, wherein controlling a refrigerant circulation amount of a cooling device of an air conditioner according to a degree of superheat of suction air of a compressor of the air conditioner comprises:
after controlling the frequency of the compressor of the cooling equipment of the air conditioner to reduce the fifth set frequency again, if the detected temperature of the rectifier module is less than or equal to the third set temperature value and the suction superheat degree of the compressor of the air conditioner is less than or equal to the power consumption parameter increasing rate of the air conditioner, controlling the frequency of the compressor of the cooling equipment of the air conditioner to continuously reduce the fifth set frequency until the frequency of the compressor of the cooling equipment of the air conditioner is reduced to the set lowest frequency, controlling the frequency of the compressor of the cooling equipment of the air conditioner to maintain the set lowest frequency to operate, and adjusting the refrigerant circulation quantity of the cooling equipment of the air;
and if the suction superheat degree of the compressor of the air conditioner is larger than the power consumption parameter increasing rate of the air conditioner, controlling the cooling equipment of the air conditioner to maintain the adjusted refrigerant circulation quantity to operate.
4. A temperature control apparatus, comprising:
a determination unit for determining an operation load of the air conditioner; an operation load of an air conditioner, comprising: a first load or a second load, the first load being greater than the second load;
the control unit is used for acquiring the power consumption parameter of the air conditioner, the photovoltaic power generation parameter of the air conditioner and the temperature of a rectification module of a frequency converter of the air conditioner if the operating load of the air conditioner is a first load, and performing first control on the temperature of the frequency converter of the air conditioner according to the power consumption parameter, the photovoltaic power generation parameter and the temperature of the rectification module, and comprises: determining the rising rate of the power consumption parameter of the air conditioner according to the power consumption parameter of the air conditioner, and determining the rising rate of the photovoltaic power generation parameter of the air conditioner according to the photovoltaic power generation parameter of the air conditioner; under the condition that the power consumption parameter rising rate of the air conditioner is smaller than the photovoltaic power generation parameter rising rate of the air conditioner, if the photovoltaic power generation parameter of the air conditioner is smaller than or equal to a first set parameter and the temperature of a rectification module of the frequency converter is larger than a set frequency limiting temperature, controlling the frequency converter to maintain the current frequency to operate; adjusting the frequency of a compressor of cooling equipment of the air conditioner according to the temperature of the rectification module;
the control unit is further used for acquiring the power consumption parameter of the air conditioner, the photovoltaic power generation parameter of the air conditioner, the temperature of a rectification module of a frequency converter of the air conditioner and the suction superheat degree of a compressor of cooling equipment of the air conditioner if the operation load of the air conditioner is a second load, and performing second control on the temperature of the frequency converter of the air conditioner according to the power consumption parameter, the photovoltaic power generation parameter, the temperature rise rate of the frequency converter and the suction superheat degree of the compressor, and comprises the following steps: determining the rising rate of the power consumption parameter of the air conditioner according to the power consumption parameter of the air conditioner, and determining the rising rate of the photovoltaic power generation parameter of the air conditioner according to the photovoltaic power generation parameter of the air conditioner; under the condition that the power consumption parameter rising rate of the air conditioner is smaller than the photovoltaic power generation parameter rising rate of the air conditioner, if the photovoltaic power generation parameter of the air conditioner is smaller than or equal to a second set parameter, the power consumption parameter of the air conditioner is set power consumption, and the temperature of a rectification module of the frequency converter is smaller than a second set temperature value, controlling the frequency of a compressor of cooling equipment of the air conditioner to reduce a fourth set frequency; after controlling the frequency of a compressor of cooling equipment of the air conditioner to reduce a fourth set frequency, if the temperature of the rectifier module is detected to be still smaller than a second set temperature value after a fourth set time, determining the temperature reduction rate of the rectifier module according to the temperature of the rectifier module; and if the temperature drop rate of the rectification module is greater than or equal to the second set temperature rise rate, controlling the frequency of a compressor of the cooling equipment of the air conditioner to reduce the fifth set frequency again, and controlling the refrigerant circulation quantity of the cooling equipment of the air conditioner according to the suction superheat degree of the compressor of the air conditioner.
5. The temperature control apparatus of claim 4, wherein the control unit adjusts a cooling device compressor frequency of the air conditioner according to the temperature of the rectification module, comprising:
after the frequency converter is controlled to maintain the current frequency to operate, if the temperature of the rectifier module is continuously detected to be greater than or equal to a first set temperature value within a first set time period, controlling the frequency of a compressor of cooling equipment of the air conditioner to increase by a first set frequency;
after controlling the frequency of a compressor of cooling equipment of the air conditioner to increase by a first set frequency, if detecting that the temperature of a rectification module is greater than or equal to a set frequency reduction temperature and less than a set protection temperature after a second set time, controlling a frequency converter of the air conditioner to operate by reducing the current frequency by a second set frequency, and determining the temperature rise rate of the rectification module according to the temperature of the rectification module;
if the temperature rise rate of the rectifier module is greater than or equal to the first set temperature rise rate, controlling the frequency of a compressor of cooling equipment of the air conditioner to rise to a third set frequency again;
after controlling the frequency of a compressor of cooling equipment of the air conditioner to increase the third set frequency again, if the detected temperature of the rectification module is greater than or equal to the set temperature and less than the set frequency reduction temperature, controlling a frequency converter of the air conditioner to maintain the operation of the frequency reduced by the second set frequency from the current frequency; and if the detected temperature of the rectifier module is less than the set temperature, controlling the frequency converter of the air conditioner to operate for a third set time length after the frequency of the current frequency is reduced by the second set frequency, and then re-determining the operation load of the air conditioner.
6. The temperature control device of claim 4, wherein the control unit controls a refrigerant circulation amount of a cooling apparatus of the air conditioner according to a suction superheat degree of a compressor of the air conditioner, and comprises:
after controlling the frequency of the compressor of the cooling equipment of the air conditioner to reduce the fifth set frequency again, if the detected temperature of the rectifier module is less than or equal to the third set temperature value and the suction superheat degree of the compressor of the air conditioner is less than or equal to the power consumption parameter increasing rate of the air conditioner, controlling the frequency of the compressor of the cooling equipment of the air conditioner to continuously reduce the fifth set frequency until the frequency of the compressor of the cooling equipment of the air conditioner is reduced to the set lowest frequency, controlling the frequency of the compressor of the cooling equipment of the air conditioner to maintain the set lowest frequency to operate, and adjusting the refrigerant circulation quantity of the cooling equipment of the air;
and if the suction superheat degree of the compressor of the air conditioner is larger than the power consumption parameter increasing rate of the air conditioner, controlling the cooling equipment of the air conditioner to maintain the adjusted refrigerant circulation quantity to operate.
7. An air conditioner, comprising: the temperature control device according to any one of claims 4 to 6;
alternatively, it comprises:
a processor for executing a plurality of instructions;
a memory to store a plurality of instructions;
wherein the plurality of instructions are to be stored by the memory and loaded and executed by the processor to perform the temperature control method of any of claims 1 to 3.
8. A storage medium having a plurality of instructions stored therein; the plurality of instructions for being loaded by a processor and for performing the temperature control method of any one of claims 1 to 3.
CN202010110548.7A 2020-02-24 2020-02-24 Temperature control method and device, storage medium and air conditioner Active CN111397077B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202010110548.7A CN111397077B (en) 2020-02-24 2020-02-24 Temperature control method and device, storage medium and air conditioner

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202010110548.7A CN111397077B (en) 2020-02-24 2020-02-24 Temperature control method and device, storage medium and air conditioner

Publications (2)

Publication Number Publication Date
CN111397077A CN111397077A (en) 2020-07-10
CN111397077B true CN111397077B (en) 2021-03-23

Family

ID=71428556

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202010110548.7A Active CN111397077B (en) 2020-02-24 2020-02-24 Temperature control method and device, storage medium and air conditioner

Country Status (1)

Country Link
CN (1) CN111397077B (en)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
TWI769702B (en) * 2021-02-09 2022-07-01 柳振堯 Bipolar high precision current sensing temperature control device
CN113864974B (en) * 2021-09-27 2022-09-30 珠海格力电器股份有限公司 Air conditioning unit, control method and device thereof, storage medium and processor
CN114110913B (en) * 2021-11-09 2022-12-13 珠海格力电器股份有限公司 Air conditioning system, anti-condensation control method and device thereof, storage medium and processor

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0029744B1 (en) * 1979-11-26 1985-05-02 Solarex Corporation Solar powered automatic turn-on control unit
CN104596045A (en) * 2015-02-12 2015-05-06 珠海格力电器股份有限公司 Temperature control method for frequency converter of air conditioning system
JP2017133699A (en) * 2016-01-25 2017-08-03 三菱電機株式会社 Air conditioning control device, air conditioning control system, air conditioning control method and program
CN107388489A (en) * 2017-07-07 2017-11-24 珠海格力电器股份有限公司 Frequency converter temprature control method, device and PV air-conditioner
CN110044031A (en) * 2019-04-15 2019-07-23 广东美的制冷设备有限公司 The control method of conditioner and automatically controlled case assembly, conditioner
CN110567139A (en) * 2019-08-30 2019-12-13 珠海格力电器股份有限公司 Frequency limiting and frequency reducing control method and device for photovoltaic air conditioner and photovoltaic air conditioner

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102798176B (en) * 2012-08-09 2015-09-09 深圳市索阳新能源科技有限公司 Solar environment friendly intelligent air condition
CN105371437B (en) * 2015-12-01 2019-05-31 青岛海尔空调器有限总公司 A kind of air conditioning control method
KR102087981B1 (en) * 2018-04-16 2020-04-23 한국산업기술시험원 Air conditioner or heat pump energy performance test apparatus and test method which can simulate time variable outdoor climate condition and indoor sensible/latent building load

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0029744B1 (en) * 1979-11-26 1985-05-02 Solarex Corporation Solar powered automatic turn-on control unit
CN104596045A (en) * 2015-02-12 2015-05-06 珠海格力电器股份有限公司 Temperature control method for frequency converter of air conditioning system
JP2017133699A (en) * 2016-01-25 2017-08-03 三菱電機株式会社 Air conditioning control device, air conditioning control system, air conditioning control method and program
CN107388489A (en) * 2017-07-07 2017-11-24 珠海格力电器股份有限公司 Frequency converter temprature control method, device and PV air-conditioner
CN110044031A (en) * 2019-04-15 2019-07-23 广东美的制冷设备有限公司 The control method of conditioner and automatically controlled case assembly, conditioner
CN110567139A (en) * 2019-08-30 2019-12-13 珠海格力电器股份有限公司 Frequency limiting and frequency reducing control method and device for photovoltaic air conditioner and photovoltaic air conditioner

Also Published As

Publication number Publication date
CN111397077A (en) 2020-07-10

Similar Documents

Publication Publication Date Title
CN111397077B (en) Temperature control method and device, storage medium and air conditioner
WO2019153887A1 (en) Control method and device for air conditioning system and air conditioning system
TWI472705B (en) Control method of air conditioning device
CN107461844B (en) Air conditioning system and power control method and device thereof
CN111174369B (en) Control method of photovoltaic direct-drive variable frequency air conditioner, computer readable storage medium and air conditioner
CN105674489A (en) Optimal control method and system of central air conditioner water pump
CN113746090B (en) Distributed resource power demand prediction system and method
JP5082585B2 (en) Air conditioning system
CN113266931B (en) Variable frequency control method and system of air conditioner and air conditioner
CN104677180A (en) Cooling tower energy saving system and method
WO2021175202A1 (en) Heating control method for variable-frequency air conditioner, and variable-frequency air conditioner
JP4287113B2 (en) Refrigerator control method and refrigeration apparatus
CN110849034B (en) Control method and device for heat pump system, heat pump system and storage medium
CN116358205A (en) Cooling capacity control method of water chiller based on average waste heat of laser
CN110986263B (en) Control system, method and application of photovoltaic direct-drive variable frequency air conditioner cooling equipment
CN104075513B (en) The weak solution circulating load precisely controlling system of lithium bromide absorption-type machine unit application
JPH04364372A (en) Solar generator linked with system
CN114738955A (en) Air conditioner and control method and control device thereof
JP5526175B2 (en) Air conditioning system
CN115247642A (en) Vehicle thermal management method and device and vehicle
CN113921946A (en) New energy automobile battery pack heat dissipation control method and system and new energy automobile
CN116007144B (en) Air conditioner control method and device, air conditioner and storage medium
CN206073374U (en) LDAR efficiency Optimal Control Systems
CN110953698A (en) Frequency carrier frequency control method of variable frequency air conditioner and variable frequency air conditioner
CN114440655B (en) Circulating water flow regulating system of condenser of double back pressure turbine

Legal Events

Date Code Title Description
PB01 Publication
PB01 Publication
SE01 Entry into force of request for substantive examination
SE01 Entry into force of request for substantive examination
GR01 Patent grant
GR01 Patent grant