CN114704942A - Method for starting variable frequency air conditioner compressor and compensating low frequency torque - Google Patents
Method for starting variable frequency air conditioner compressor and compensating low frequency torque Download PDFInfo
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- CN114704942A CN114704942A CN202210458445.9A CN202210458445A CN114704942A CN 114704942 A CN114704942 A CN 114704942A CN 202210458445 A CN202210458445 A CN 202210458445A CN 114704942 A CN114704942 A CN 114704942A
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- 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
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- 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
- F24F11/65—Electronic processing for selecting an operating mode
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- 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
- F24F11/89—Arrangement or mounting of control or safety devices
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B49/00—Arrangement or mounting of control or safety devices
- F25B49/02—Arrangement or mounting of control or safety devices for compression type machines, plants or systems
- F25B49/022—Compressor control arrangements
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P21/00—Arrangements or methods for the control of electric machines by vector control, e.g. by control of field orientation
- H02P21/14—Estimation or adaptation of machine parameters, e.g. flux, current or voltage
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]
- Y02B30/70—Efficient control or regulation technologies, e.g. for control of refrigerant flow, motor or heating
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- Engineering & Computer Science (AREA)
- Signal Processing (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Fuzzy Systems (AREA)
- Mathematical Physics (AREA)
- Thermal Sciences (AREA)
- Power Engineering (AREA)
- Air Conditioning Control Device (AREA)
- Control Of Ac Motors In General (AREA)
Abstract
The invention relates to a method for starting a compressor of an inverter air conditioner and compensating low-frequency torque, which comprises the following steps: a starting method of a variable frequency air conditioner compressor and a low-frequency torque compensation method after starting; the starting method of the variable frequency air conditioner compressor comprises the following steps: detecting the pipeline pressure difference of a compressor and the environment temperature difference of an indoor unit and an outdoor unit of the air conditioner; judging whether the pipeline pressure difference of the compressor is greater than a preset pressure difference value, if so, starting in an open-loop starting mode, and if not, judging whether the environmental temperature difference between an indoor unit and an outdoor unit of the air conditioner is less than a preset temperature difference value; and if the environmental temperature difference between the indoor unit and the outdoor unit of the air conditioner is smaller than the preset temperature difference value, starting in a closed-loop starting mode and judging whether the starting is successful. The invention has the advantages that: different starting modes are adopted for the compressor through detection of the internal environment and the external environment of the air conditioner, so that vibration and noise are reduced on the premise that the compressor is easy to start, and low-frequency torque is compensated to reduce vibration and noise at a low-frequency stage.
Description
Technical Field
The invention relates to the technical field of air conditioner control, in particular to a method for starting a variable frequency air conditioner compressor and compensating low-frequency torque.
Background
The inverter air conditioner compressor is driven by a motor, and realizes the processes of air suction, compression and air exhaust in a mechanical cycle. The starting of the motor in the frequency conversion field comprises an open-loop starting mode and a closed-loop starting mode.
The open loop start mode first performs an open loop pull and then turns to closed loop control. And in the closed-loop starting mode, the position of the rotor is firstly detected to directly carry out closed-loop starting control without open-loop lifting. The open loop start mode provides a large start current and moment through the open loop pull-up stage so as to realize reliable start, but because the start current and the moment are large, the vibration and the noise are also relatively large and the energy consumption is high. And in the closed loop starting mode, the starting current is small, the noise is low, and the energy is relatively saved. However, for the air conditioning system, the load of the compressor is influenced by the factors inside and outside the system, the change is large, and the compressor is easy to fail to start by directly adopting closed-loop starting.
An electric motor is a device that converts electrical energy into mechanical energy. The motor is also called as a motor and is composed of a stator and a rotor. The rotor rotates relative to the stator. Due to the characteristics of the compressor, the pressure in the cylinder of the compressor changes periodically, so that the load torque of the rotor changes along with the position change of the rotor during operation, particularly in a low-frequency state, the fluctuation is severe, and a serious vibration problem exists, so that the low-frequency torque needs to be compensated.
Disclosure of Invention
The present invention is directed to a method for starting a compressor of an inverter air conditioner and compensating low-frequency torque, so as to solve the problems mentioned in the background art.
In order to achieve the purpose, the invention provides the following technical scheme:
a method for starting and compensating low-frequency torque of a compressor of a variable-frequency air conditioner is applied to a permanent magnet synchronous motor, and comprises the following steps: a starting method of a variable frequency air conditioner compressor and a low-frequency torque compensation method after starting;
the starting method of the variable frequency air conditioner compressor comprises the following steps:
detecting the pipeline pressure difference of a compressor and the environment temperature difference of an indoor unit and an outdoor unit of the air conditioner;
judging whether the pipeline pressure difference of the compressor is greater than a preset pressure difference value, if so, starting in an open-loop starting mode, and if not, judging whether the environmental temperature difference between an indoor unit and an outdoor unit of the air conditioner is less than a preset temperature difference value;
if the environmental temperature difference between the indoor unit and the outdoor unit of the air conditioner is smaller than the preset temperature difference value, starting in a closed-loop starting mode and judging whether the starting is successful, and if the starting is not successful, starting for the second time in an open-loop starting mode;
the low-frequency torque compensation method after starting comprises the following steps:
after the compressor is started successfully, determining the frequency difference between the designated frequency and the actual frequency of the permanent magnet synchronous motor and the phase angle of the permanent magnet synchronous motor;
determining a torque compensation amount of the rotor based on the frequency difference and the phase angle;
determining a d-axis current command value and a q-axis current command value of the permanent magnet synchronous motor based on the torque compensation quantity of the rotor;
and adjusting and compensating the torque of the rotor based on the d-axis current command value and the q-axis current command value.
As a further scheme of the invention: the pipeline pressure difference of the compressor is the pressure difference between the exhaust pipe and the air return pipe of the compressor.
As a further scheme of the invention: the indoor unit and the outdoor unit of the variable frequency air conditioner compressor are respectively provided with a temperature sensor, and the environment temperature difference of the indoor unit and the outdoor unit is calculated based on the temperature detection values of the temperature sensors of the indoor unit and the outdoor unit.
As a further scheme of the invention: the temperature sensors of the indoor unit and the outdoor unit are respectively arranged on the evaporator and the condenser.
As a further scheme of the invention: the specific way of determining the torque compensation amount of the rotor based on the frequency difference and the phase angle determines the amplitude of the fundamental cosine component and the amplitude of the fundamental sine component of the frequency fluctuation of the permanent magnet synchronous motor based on the frequency difference and the phase angle, and then determines the torque compensation amount based on the amplitude of the fundamental cosine component and the amplitude of the fundamental sine component of the frequency fluctuation.
A starting method of an inverter air conditioner compressor comprises the following steps:
detecting the pipeline pressure difference of a compressor and the environment temperature difference of an indoor unit and an outdoor unit of the air conditioner;
judging whether the pipeline pressure difference of the compressor is greater than a preset pressure difference value, if so, starting in an open-loop starting mode, and if not, judging whether the environmental temperature difference between an indoor unit and an outdoor unit of the air conditioner is less than a preset temperature difference value;
if the environmental temperature difference between the indoor unit and the outdoor unit of the air conditioner is smaller than the preset temperature difference value, starting in a closed-loop starting mode and judging whether the starting is successful, and if the starting is not successful, starting for the second time in an open-loop starting mode;
as a further scheme of the invention: the pipeline pressure difference of the compressor is the pressure difference between the exhaust pipe and the air return pipe of the compressor. As a further scheme of the invention: the indoor unit and the outdoor unit of the variable frequency air conditioner compressor are respectively provided with a temperature sensor, and the environment temperature difference of the indoor unit and the outdoor unit is calculated based on the temperature detection values of the temperature sensors of the indoor unit and the outdoor unit. As a further scheme of the invention: the temperature sensors of the indoor unit and the outdoor unit are respectively arranged on the evaporator and the condenser. As a further scheme of the invention: and performing low-frequency torque compensation when the compressor is in a low-frequency stage after being started.
Compared with the prior art, the invention has the beneficial effects that: different starting modes are adopted for the compressor through detection of the internal environment and the external environment of the air conditioner, so that vibration and noise are reduced on the premise that the compressor is easy to start.
In the low frequency phase, the low frequency torque is compensated to reduce vibration and noise.
Other features and advantages of the present invention will be disclosed in more detail in the following detailed description of the invention and the accompanying drawings.
Drawings
Fig. 1 is a flowchart of an inverter air-conditioner compressor starting method according to an inverter air-conditioner compressor starting and low-frequency torque compensation method of the present invention.
Fig. 2 is a flowchart of a low-frequency torque compensation method after starting of the inverter air conditioner compressor and the low-frequency torque compensation method according to the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. 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.
As shown in fig. 1 and 2, a method for starting an inverter air conditioner compressor and compensating low-frequency torque can be applied to a permanent magnet synchronous motor. Specifically, the method for starting the inverter air conditioner compressor and compensating the low-frequency torque comprises the following steps: the method comprises a starting method of the variable frequency air conditioner compressor and a low-frequency torque compensation method after starting.
The starting method of the compressor of the inverter air conditioner comprises the following steps:
detecting the pipeline pressure difference of a compressor and the environmental temperature difference of an indoor unit and an outdoor unit of the air conditioner;
judging whether the pipeline pressure difference of the compressor is greater than a preset pressure difference value, if so, starting in an open-loop starting mode, and if not, judging whether the environmental temperature difference between an indoor unit and an outdoor unit of the air conditioner is less than a preset temperature difference value;
and if the environmental temperature difference between the indoor unit and the outdoor unit of the air conditioner is smaller than the preset temperature difference value, starting in a closed-loop starting mode and judging whether the starting is successful, and if the starting is not successful, starting for the second time in an open-loop starting mode.
The low-frequency torque compensation method after starting comprises the following steps:
after the compressor is started successfully, determining the frequency difference between the designated frequency and the actual frequency of the permanent magnet synchronous motor and the phase angle of the permanent magnet synchronous motor;
determining a torque compensation amount of the rotor based on the frequency difference and the phase angle;
determining a d-axis current command value and a q-axis current command value of the permanent magnet synchronous motor based on the torque compensation quantity of the rotor;
and adjusting and compensating the torque of the rotor based on the d-axis current command value and the q-axis current command value.
In one specific embodiment, the pipeline pressure difference of the compressor is the air pressure difference between the exhaust pipe and the return pipe of the compressor. Whether the compressor is in a stable standing state or not can be judged through the pressure difference between the exhaust pipe and the air return pipe, and the pressure balance can be achieved through the internal pipeline of the air conditioner which is stably placed for a period of time, so that the compressor is easy to start. The influence of the internal factors of the system on the starting can be reduced under the pressure balance state. In the case where the factors inside the discharge system are not interfering, the factors outside the system are further judged. Specifically, whether the air conditioner is in an extreme state can be determined by judging the environmental temperature difference between the indoor unit and the outdoor unit of the air conditioner. Such as over-temperature conditions and under-temperature conditions. If the solar cell is not in an extreme weather state, the solar cell has the condition of adopting closed-loop starting. And if the closed-loop starting cannot complete the starting, the open-loop starting mode is adopted again for starting so as to improve the starting reliability.
In a specific embodiment, the indoor unit and the outdoor unit of the inverter air-conditioning compressor are respectively provided with a temperature sensor, and the environmental temperature difference between the indoor unit and the outdoor unit is calculated based on the temperature detection values of the temperature sensors of the indoor unit and the outdoor unit. Specifically, the temperature sensors of the indoor unit and the outdoor unit are provided in the evaporator and the condenser, respectively.
As a specific embodiment, a specific way of determining the torque compensation amount of the rotor based on the frequency difference and the phase angle determines the amplitude of the fundamental cosine component and the amplitude of the fundamental sine component of the frequency ripple of the permanent magnet synchronous motor based on the frequency difference and the phase angle, and then determines the torque compensation amount based on the amplitude of the fundamental cosine component and the amplitude of the fundamental sine component of the frequency ripple. Since specific algorithms are known or routine to those skilled in the art, they are not described in detail herein.
A starting method of an inverter air conditioner compressor comprises the following steps:
detecting the pipeline pressure difference of a compressor and the environment temperature difference of an indoor unit and an outdoor unit of the air conditioner;
judging whether the pipeline pressure difference of the compressor is greater than a preset pressure difference value, if so, starting in an open-loop starting mode, and if not, judging whether the environmental temperature difference between an indoor unit and an outdoor unit of the air conditioner is less than a preset temperature difference value;
if the environmental temperature difference between the indoor unit and the outdoor unit of the air conditioner is smaller than the preset temperature difference value, starting in a closed-loop starting mode and judging whether the starting is successful, and if the starting is not successful, starting for the second time in an open-loop starting mode;
in one specific embodiment, the pipeline pressure difference of the compressor is the air pressure difference between the exhaust pipe and the return pipe of the compressor. The indoor unit and the outdoor unit of the variable frequency air conditioner compressor are respectively provided with a temperature sensor, and the environment temperature difference of the indoor unit and the outdoor unit is calculated based on the temperature detection values of the temperature sensors of the indoor unit and the outdoor unit. The temperature sensors of the indoor unit and the outdoor unit are respectively arranged on the evaporator and the condenser. And performing low-frequency torque compensation when the compressor is in a low-frequency stage after being started.
It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.
Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be combined as appropriate to form other embodiments understood by those skilled in the art.
Claims (10)
1. A method for starting and compensating low-frequency torque of a variable-frequency air conditioner compressor is applied to a permanent magnet synchronous motor, and is characterized by comprising the following steps: a starting method of a variable frequency air conditioner compressor and a low-frequency torque compensation method after starting;
the starting method of the variable-frequency air conditioner compressor comprises the following steps:
detecting the pipeline pressure difference of the compressor and the environment temperature difference of an indoor unit and an outdoor unit of the air conditioner;
judging whether the pipeline pressure difference of the compressor is greater than a preset pressure difference value, if so, starting in an open-loop starting mode, and if not, judging whether the environmental temperature difference between the indoor unit and the outdoor unit of the air conditioner is less than a preset temperature difference value;
if the environmental temperature difference between the indoor unit and the outdoor unit of the air conditioner is smaller than a preset temperature difference value, starting in a closed-loop starting mode and judging whether the starting is successful, and if the starting is not successful, starting for the second time in an open-loop starting mode;
the method for compensating the low-frequency torque after starting comprises the following steps:
after the compressor is started successfully, determining the frequency difference between the designated frequency and the actual frequency of the permanent magnet synchronous motor and the phase angle of the permanent magnet synchronous motor;
determining a torque compensation amount of the rotor based on the frequency difference and the phase angle;
determining a d-axis current command value and a q-axis current command value of the permanent magnet synchronous motor based on the torque compensation amount of the rotor;
and adjusting and compensating the torque of the rotor based on the d-axis current command value and the q-axis current command value.
2. The method for starting and compensating the low-frequency torque of the compressor of the inverter air conditioner as claimed in claim 1,
the pipeline pressure difference of the compressor is the air pressure difference between the exhaust pipe of the compressor and the air return pipe.
3. The method for starting and compensating the low-frequency torque of the compressor of the inverter air conditioner as claimed in claim 1,
the indoor unit and the outdoor unit of the variable frequency air conditioner compressor are respectively provided with a temperature sensor, and the environment temperature difference between the indoor unit and the outdoor unit is calculated based on the temperature detection values of the temperature sensors of the indoor unit and the outdoor unit.
4. The method for starting and compensating the low-frequency torque of the compressor of the inverter air conditioner as claimed in claim 3,
the temperature sensors of the indoor unit and the outdoor unit are respectively arranged on the evaporator and the condenser.
5. The method for starting and compensating the low-frequency torque of the compressor of the inverter air conditioner as claimed in claim 1,
a specific way of determining the torque compensation amount of the rotor based on the frequency difference and the phase angle determines a fundamental cosine component amplitude and a fundamental sine component amplitude of a frequency fluctuation of the permanent magnet synchronous motor based on the frequency difference and the phase angle, and then determines the torque compensation amount based on the fundamental cosine component amplitude and the fundamental sine component amplitude of the frequency fluctuation.
6. A starting method of a compressor of an inverter air conditioner is characterized by comprising the following steps:
detecting the pipeline pressure difference of the compressor and the environment temperature difference of an indoor unit and an outdoor unit of the air conditioner;
judging whether the pipeline pressure difference of the compressor is greater than a preset pressure difference value, if so, starting in an open-loop starting mode, and if not, judging whether the environmental temperature difference between the indoor unit and the outdoor unit of the air conditioner is less than a preset temperature difference value;
and if the environmental temperature difference between the indoor unit and the outdoor unit of the air conditioner is smaller than a preset temperature difference value, starting in a closed-loop starting mode and judging whether the starting is successful, and if the starting is not successful, starting for the second time in an open-loop starting mode.
7. The starting method of the inverter air conditioner compressor as claimed in claim 6,
the pipeline pressure difference of the compressor is the air pressure difference between the exhaust pipe of the compressor and the air return pipe.
8. The starting method of the inverter air conditioner compressor as claimed in claim 6,
the indoor unit and the outdoor unit of the variable frequency air conditioner compressor are respectively provided with a temperature sensor, and the environment temperature difference between the indoor unit and the outdoor unit is calculated based on the temperature detection values of the temperature sensors of the indoor unit and the outdoor unit.
9. The starting method of the inverter air conditioner compressor as claimed in claim 8,
the temperature sensors of the indoor unit and the outdoor unit are respectively arranged on the evaporator and the condenser.
10. The method for starting the compressor of the inverter air conditioner as claimed in claim 6, further comprising the steps of:
and performing low-frequency torque compensation when the compressor is in a low-frequency stage after being started.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202210458445.9A CN114704942A (en) | 2022-04-27 | 2022-04-27 | Method for starting variable frequency air conditioner compressor and compensating low frequency torque |
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| CN202210458445.9A CN114704942A (en) | 2022-04-27 | 2022-04-27 | Method for starting variable frequency air conditioner compressor and compensating low frequency torque |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP2355333A2 (en) * | 2010-02-08 | 2011-08-10 | Lg Electronics Inc. | Apparatus for driving compressor of air conditioner and method for driving the same |
| CN103296958A (en) * | 2013-05-22 | 2013-09-11 | 四川长虹电器股份有限公司 | Method and system for automatically compensating torque |
| CN106123417A (en) * | 2016-06-27 | 2016-11-16 | 广东美的制冷设备有限公司 | The control method that a kind of compressor of air conditioner starts and control device |
| CN109882988A (en) * | 2019-03-12 | 2019-06-14 | 奥克斯空调股份有限公司 | Control method, device and the air conditioner for preventing air-conditioner coolant from migrating |
| CN110332670A (en) * | 2019-07-16 | 2019-10-15 | 珠海格力电器股份有限公司 | Compressor control method and control device and refrigerant system |
| CN113701305A (en) * | 2021-07-26 | 2021-11-26 | 宁波奥克斯电气股份有限公司 | Air conditioner shutdown differential pressure balance control method and device and air conditioner |
-
2022
- 2022-04-27 CN CN202210458445.9A patent/CN114704942A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP2355333A2 (en) * | 2010-02-08 | 2011-08-10 | Lg Electronics Inc. | Apparatus for driving compressor of air conditioner and method for driving the same |
| CN103296958A (en) * | 2013-05-22 | 2013-09-11 | 四川长虹电器股份有限公司 | Method and system for automatically compensating torque |
| CN106123417A (en) * | 2016-06-27 | 2016-11-16 | 广东美的制冷设备有限公司 | The control method that a kind of compressor of air conditioner starts and control device |
| CN109882988A (en) * | 2019-03-12 | 2019-06-14 | 奥克斯空调股份有限公司 | Control method, device and the air conditioner for preventing air-conditioner coolant from migrating |
| CN110332670A (en) * | 2019-07-16 | 2019-10-15 | 珠海格力电器股份有限公司 | Compressor control method and control device and refrigerant system |
| CN113701305A (en) * | 2021-07-26 | 2021-11-26 | 宁波奥克斯电气股份有限公司 | Air conditioner shutdown differential pressure balance control method and device and air conditioner |
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Application publication date: 20220705 |