CN117029196B - Intelligent energy-saving variable frequency control method, system and storage medium for central air conditioner - Google Patents
Intelligent energy-saving variable frequency control method, system and storage medium for central air conditioner Download PDFInfo
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- CN117029196B CN117029196B CN202311270623.6A CN202311270623A CN117029196B CN 117029196 B CN117029196 B CN 117029196B CN 202311270623 A CN202311270623 A CN 202311270623A CN 117029196 B CN117029196 B CN 117029196B
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- 238000005057 refrigeration Methods 0.000 claims abstract description 61
- 238000012423 maintenance Methods 0.000 claims abstract description 26
- 238000004378 air conditioning Methods 0.000 claims description 55
- 238000001816 cooling Methods 0.000 claims description 46
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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
- F24F11/30—Control or safety arrangements for purposes related to the operation of the system, e.g. for safety or monitoring
- F24F11/46—Improving electric energy efficiency or saving
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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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- 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
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- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
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Abstract
The invention discloses an intelligent energy-saving variable frequency control method, a system and a storage medium for a central air conditioner, which relate to the field of energy-saving optimal control of the central air conditioner and comprise the following steps: establishing a temperature and frequency estimated time model, and establishing a temperature maintenance minimum frequency model; obtaining a central air conditioner control instruction and judging the refrigeration or heating of the central air conditioner; if the central air conditioner is used for refrigerating, the first operation is performed at the lowest central air conditioner refrigerating frequency, the second operation is performed at the lowest central air conditioner refrigerating frequency, the temperature is reduced to the target refrigerating temperature, and the third operation is performed at the lowest central air conditioner refrigerating frequency, so that the target refrigerating temperature is maintained; if the central air conditioner is heating, the first operation is performed at the lowest central air conditioner heating frequency, the second operation is performed at the lowest central air conditioner heating frequency, the temperature is raised to the target heating temperature, and the third operation is performed at the lowest central air conditioner heating frequency, so that the target heating temperature is maintained. The model building module, the operation module and the variable frequency control module are arranged to match corresponding frequency operation, so that extra power consumption is avoided.
Description
Technical Field
The invention relates to the field of energy-saving optimization control of central air conditioners, in particular to an intelligent energy-saving variable frequency control method, system and storage medium of a central air conditioner.
Background
The central air conditioning system consists of one or more cold and heat source systems and a plurality of air conditioning systems, and adopts the principle of liquid gasification refrigeration to provide required cold energy for the air conditioning systems so as to offset the heat load of indoor environment; the heating system provides the air conditioning system with the required heat to counteract the indoor environmental cooling and heating load. The refrigeration system is a vital part of the central air conditioning system, and the type, the operation mode, the structural form and the like of the refrigeration system directly influence the economy, the high efficiency and the rationality of the central air conditioning system in operation.
The existing central air conditioner has the common defects of higher energy consumption and poor energy conservation, so that the electricity consumption is high, and although part of the central air conditioner adopts variable frequency control, the control mode is single, the frequency is set to be in a high-frequency and low-frequency two-gear mode, the high-frequency and low-frequency data are not changed according to the environment, the electricity consumption of the variable frequency control is not optimal, and the extra electricity is still consumed.
Disclosure of Invention
In order to solve the technical problems, the technical scheme provides an intelligent energy-saving variable frequency control method, system and storage medium for a central air conditioner, which solve the problems that the prior central air conditioner provided in the background art has common defects of higher energy consumption and poorer energy conservation, so that the electricity consumption is high, and although part of central air conditioners adopt variable frequency control, the control mode is single, the frequency is set to be in a high-frequency and low-frequency two-gear mode, the data of the high frequency and the low frequency are not changed according to the environment, the electricity consumption of the variable frequency control is not optimal, and additional electric quantity is still consumed.
In order to achieve the above purpose, the invention adopts the following technical scheme:
an intelligent energy-saving variable frequency control method for a central air conditioner comprises the following steps:
establishing a temperature and frequency estimated time model, wherein the establishing of the temperature and frequency estimated time model comprises the following steps:
taking the temperature change value and the central air conditioner operating frequency as independent variables, and taking the estimated time of the indoor temperature change amplitude as the temperature change value as the dependent variables;
collecting different temperature change values, central air conditioner operating frequencies and corresponding estimated time by big data;
drawing a three-dimensional curve according to the collected data;
determining a fitted function model according to the three-dimensional curve;
solving unknowns in the function model to obtain a fitting function；
Establishing a temperature maintenance minimum frequency model, wherein the establishing of the temperature maintenance minimum frequency model comprises the following steps:
taking the outdoor temperature and the indoor temperature as independent variables, and taking the lowest frequency for maintaining the indoor temperature as the dependent variable;
the big data are collected to obtain different outdoor temperatures and indoor temperatures and the lowest frequency corresponding to the different outdoor temperatures and the indoor temperatures;
drawing a three-dimensional curve according to the collected data;
determining a fitted function model according to the three-dimensional curve;
solving unknowns in the function model to obtain a fitting function；
Obtaining a central air conditioner control instruction and judging the refrigeration or heating of the central air conditioner;
if the central air conditioner refrigerates, acquiring a target refrigerating temperature, acquiring an indoor temperature, and calculating a high-frequency refrigerating operation temperature according to the golden section ratio;
the calculation of the high-frequency cooling operation temperature includes the steps of:
acquiring a target refrigeration temperature A and an indoor temperature B;
according to the golden section ratioCalculating to obtain->；
C is the high-frequency refrigeration operation temperature;
according to the temperature and frequency estimated time model, calculating to obtain the lowest central air conditioner refrigerating frequency I of which the indoor temperature is reduced to the high-frequency refrigerating operation temperature within the preset refrigerating time I;
the calculation method of the lowest central air conditioner refrigerating frequency of the indoor temperature to be reduced to the high-frequency refrigerating operation temperature in the preset refrigerating time I comprises the following steps:
obtaining preset refrigeration time D, high-frequency refrigeration running temperature C and indoor temperature B, and assuming the lowest central air conditioner refrigeration frequency E;
fitting function substituted into temperature and frequency estimated time modelIn (3) obtaining the target equation；
Calculating an estimated value of E through a target equation, and obtaining the first lowest central air conditioner refrigerating frequency;
the first lowest central air conditioning refrigerating frequency is used for operation, the temperature is reduced to the high-frequency refrigerating operation temperature, and the second lowest central air conditioning refrigerating frequency, in which the high-frequency refrigerating operation temperature is reduced to the target refrigerating temperature, is calculated in the second preset refrigerating time according to the temperature and the frequency estimated time model;
the calculation shows that the cooling frequency II of the lowest central air conditioner, which is cooled to the target cooling temperature by the high-frequency cooling operation temperature, in the preset cooling time II comprises the following steps:
obtaining preset refrigeration time II G, high-frequency refrigeration running temperature C and target refrigeration temperature A, and assuming the lowest central air conditioner refrigeration frequency II to be H;
fitting function substituted into temperature and frequency estimated time modelIn (3) obtaining the conditional equation；
Calculating an estimated value of H through a conditional equation, and obtaining a second lowest central air conditioner refrigerating frequency;
operating at the second lowest central air conditioning refrigerating frequency, cooling to a target refrigerating temperature, acquiring outdoor temperature, maintaining a lowest frequency model according to the temperature, and calculating the third lowest central air conditioning refrigerating frequency maintaining the current target refrigerating temperature;
calculating the lowest central air conditioning refrigeration frequency III for maintaining the current target refrigeration temperature comprises the following steps:
acquiring an outdoor temperature I and a target refrigeration temperature A;
fitting function into temperature maintenance minimum frequency modelObtaining the lowest central air conditioner refrigerating frequency III;
the method comprises the steps of operating at the lowest central air conditioning refrigerating frequency three, and maintaining a target refrigerating temperature;
wherein the first preset refrigerating time is less than one third of the second preset refrigerating time;
if the central air conditioner is heated, acquiring a target heating temperature, acquiring an indoor temperature, and calculating a high-frequency heating operation temperature according to the golden section ratio;
the calculation of the high-frequency heating operation temperature includes the steps of:
acquiring a target heating temperature J and an indoor temperature B;
according to the golden section ratioCalculating to obtain->；
K is the high-frequency heating operation temperature;
calculating a lowest central air conditioner heating frequency I from which the indoor temperature rises to the high-frequency heating operation temperature in a preset heating time I according to the temperature and frequency estimated time model;
the calculation shows that the lowest central air conditioner heating frequency I of the indoor temperature rising to the high-frequency heating operation temperature in the preset heating time I comprises the following steps:
obtaining preset heating time d, high-frequency heating operation temperature c and indoor temperature B, and assuming that the lowest central air conditioner heating frequency e;
fitting function substituted into temperature and frequency estimated time modelIn (3) obtaining a fitting equation；
Calculating an estimated value of E by a fitting equation and adopting a dichotomy method, so as to obtain the first lowest central air-conditioning heat frequency;
operating at the first lowest central air conditioning heating frequency, heating to a high-frequency heating operation temperature, and calculating to obtain the second lowest central air conditioning heating frequency at which the high-frequency heating operation temperature is heated to the target heating temperature in the second preset heating time according to the temperature and frequency estimated time model;
the calculation shows that the lowest central air conditioner heating frequency II which is obtained by heating the high-frequency heating operation temperature to the target heating temperature in the preset heating time II comprises the following steps:
obtaining preset heating time II g, high-frequency heating operation temperature c and target heating temperature J, and assuming that the lowest central air conditioner heating frequency II is h;
fitting function substituted into temperature and frequency estimated time modelIn (3), obtaining a marginal equation；
Calculating an estimated value of h by adopting a binary method through a marginal equation, and obtaining a second lowest central air-conditioning heat frequency;
operating at the lowest central air conditioning heating frequency II, heating to the target heating temperature, acquiring outdoor temperature, maintaining a lowest frequency model according to the temperature, and calculating the lowest central air conditioning heating frequency III for maintaining the current target heating temperature;
calculating a lowest central air conditioner heating frequency III for maintaining the current target heating temperature comprises the following steps:
acquiring an outdoor temperature I and a target heating temperature J;
fitting function into temperature maintenance minimum frequency modelObtaining the lowest central air conditioner thermal frequency III;
the three operation of the lowest central air conditioner heating frequency is adopted to maintain the target heating temperature;
wherein the first preset heating time is less than one third of the second preset heating time.
An intelligent energy-saving variable frequency control system of a central air conditioner is used for realizing the intelligent energy-saving variable frequency control method of the central air conditioner, and comprises the following steps:
the data collection module is used for collecting data for establishing a temperature and frequency estimated time model and establishing a temperature maintenance minimum frequency model;
the model building module is used for building a temperature and frequency estimated time model and building a temperature maintenance minimum frequency model;
the mode switching module is used for receiving a central air conditioner control instruction, judging whether the central air conditioner adopts a refrigerating or heating mode, and adjusting the central air conditioner mode according to a judging result;
the operation module is used for calculating a high-frequency refrigerating operation temperature and a high-frequency heating operation temperature, and calculating a first lowest central air conditioning refrigerating frequency, a second lowest central air conditioning refrigerating frequency, a third lowest central air conditioning refrigerating frequency, a first lowest central air conditioning heating frequency, a second lowest central air conditioning heating frequency and a third lowest central air conditioning heating frequency according to the established temperature and frequency estimated time model and the established temperature maintenance minimum frequency model;
the frequency conversion control module is used for performing intelligent energy-saving frequency conversion on the central air conditioner.
A storage medium having stored thereon a computer readable program which when invoked performs the intelligent energy-saving variable frequency control method of a central air conditioner described above.
Compared with the prior art, the invention has the beneficial effects that:
through setting up data collection module, model establishment module, operation module and frequency conversion control module, to the central air conditioning operational environment of different circumstances, set up different high frequency refrigeration operating temperature or high frequency and heat operating temperature, and its high frequency operating frequency carries out corresponding change along with the temperature is different, guarantee that it is when reaching refrigeration or heating effect, the power consumption is also less, simultaneously, after reaching high frequency refrigeration operating temperature or high frequency and heat operating temperature, set up corresponding low frequency operating frequency, operate to target refrigeration temperature or target heating temperature, ensure that the power consumption is less, in addition, overall outdoor temperature and indoor temperature, obtain central air conditioning and maintain the minimum frequency of temperature, avoid using higher frequency, consume extra electric power.
Drawings
FIG. 1 is a schematic flow chart of an intelligent energy-saving variable frequency control method of a central air conditioner;
FIG. 2 is a schematic flow chart of a temperature and frequency estimation time model establishment in the invention;
FIG. 3 is a schematic flow chart of the temperature maintenance minimum frequency model establishment method of the invention;
FIG. 4 is a schematic diagram showing a flow chart of the cooling frequency of the lowest central air conditioner calculated by the method of the invention, wherein the indoor temperature is reduced to the high-frequency cooling operation temperature within the preset cooling time I;
FIG. 5 is a schematic diagram showing the cooling frequency flow of the lowest central air conditioner calculated by the method that the high-frequency cooling operation temperature is reduced to the target cooling temperature within the second preset cooling time;
FIG. 6 is a schematic diagram of the cooling frequency flow chart of the lowest central air conditioner for calculating and maintaining the current target cooling temperature.
Detailed Description
The following description is presented to enable one of ordinary skill in the art to make and use the invention. The preferred embodiments in the following description are by way of example only and other obvious variations will occur to those skilled in the art.
Referring to fig. 1-6, an intelligent energy-saving frequency conversion control method for a central air conditioner comprises the following steps:
establishing a temperature and frequency estimated time model, and establishing a temperature maintenance minimum frequency model;
obtaining a central air conditioner control instruction and judging the refrigeration or heating of the central air conditioner;
if the central air conditioner refrigerates, acquiring a target refrigerating temperature, acquiring an indoor temperature, calculating a high-frequency refrigerating operation temperature according to a golden section ratio, calculating a lowest central air conditioner refrigerating frequency I for cooling the indoor temperature to the high-frequency refrigerating operation temperature in a preset refrigerating time I according to a temperature and frequency estimated time model, operating at the lowest central air conditioner refrigerating frequency I, cooling to the high-frequency refrigerating operation temperature, calculating a lowest central air conditioner refrigerating frequency II for cooling the high-frequency refrigerating operation temperature to the target refrigerating temperature in a preset refrigerating time II according to a temperature and frequency estimated time model, operating at the lowest central air conditioner refrigerating frequency II, cooling to the target refrigerating temperature, acquiring an outdoor temperature, maintaining a lowest frequency model according to temperature, calculating a lowest central air conditioner refrigerating frequency III for maintaining the current target refrigerating temperature, and maintaining the target refrigerating temperature in the lowest central air conditioner refrigerating frequency III;
wherein the first preset refrigerating time is less than one third of the second preset refrigerating time;
the reason why the golden ratio is used as the calculation of the high-frequency and low-frequency nodes during refrigeration is that in actual production, a large number of golden ratio are used as the division nodes, the effect of which is checked, and the actual requirements can be better met, so that the golden ratio is also used as the basis for calculating the high-frequency and low-frequency nodes in the method, otherwise, the high-frequency and low-frequency nodes need to be calculated by reestablishing a model, which occupies memory and slows down the running speed of the whole process;
the central air conditioner generally sets a preset cooling time I, the temperature is reduced to the high-frequency cooling operation temperature in the preset cooling time I, if the cooling cannot be completed in the preset cooling time I, a user may not be satisfied with the cooling effect, but if the cooling is completed in the preset cooling time I, the use frequency is higher, the electric power consumption is larger, and the cooling effect can be satisfied by just reducing the temperature to the high-frequency cooling operation temperature in the preset cooling time I when the lowest central air conditioner cooling frequency is operated, and the cooling effect and the energy consumption can be satisfied;
when the temperature is reduced to the high-frequency refrigeration operation temperature, the requirement of a user on the temperature is not too high, so that the operation frequency can be reduced in the process of reducing the high-frequency refrigeration operation temperature to the target refrigeration temperature, and the operation is carried out at the second lowest central air-conditioning refrigeration frequency, and the temperature can be reduced to the target refrigeration temperature just when the second refrigeration time is preset;
the preset refrigeration time I is less than one third of the preset refrigeration time II, and is also in accordance with the actual conditions of high-frequency and low-frequency operation time;
after the target refrigerating temperature is reached, the indoor temperature is maintained, and the lowest central air conditioner refrigerating frequency III for maintaining the current target refrigerating temperature is obtained according to the indoor temperature and the outdoor temperature, otherwise, the temperature cannot be maintained by operating at a lower frequency, and the energy consumption is increased by operating at a higher temperature;
the heating variable frequency control is similar to refrigeration;
if the central air conditioner heats, obtaining a target heating temperature, obtaining an indoor temperature, calculating a high-frequency heating operation temperature according to a golden section ratio, calculating a lowest central air conditioner heating frequency I which is obtained by heating the indoor temperature to the high-frequency heating operation temperature in a preset heating time I according to a temperature and frequency estimated time model, operating at the lowest central air conditioner heating frequency I, heating to the high-frequency heating operation temperature, calculating a lowest central air conditioner heating frequency II which is obtained by heating the high-frequency heating operation temperature to the target heating temperature in a preset heating time II according to a temperature and frequency estimated time model, operating at the lowest central air conditioner heating frequency II, heating to the target heating temperature, obtaining an outdoor temperature, maintaining a lowest frequency model according to the temperature, calculating a lowest central air conditioner heating frequency III which maintains the current target heating temperature, and operating at the lowest central air conditioner heating frequency III, and maintaining the target heating temperature;
wherein the first preset heating time is less than one third of the second preset heating time.
The temperature and frequency estimated time model establishment comprises the following steps:
taking the temperature change value and the central air conditioner operating frequency as independent variables, and taking the estimated time of the indoor temperature change amplitude as the temperature change value as the dependent variables;
collecting different temperature change values, central air conditioner operating frequencies and corresponding estimated time by big data;
drawing a three-dimensional curve according to the collected data;
determining a fitted function model according to the three-dimensional curve;
solving unknowns in the function model to obtain a simulationFunction of synthesis。
Establishing a temperature maintenance minimum frequency model comprises the following steps;
taking the outdoor temperature and the indoor temperature as independent variables, and taking the lowest frequency for maintaining the indoor temperature as the dependent variable;
the big data are collected to obtain different outdoor temperatures and indoor temperatures and the lowest frequency corresponding to the different outdoor temperatures and the indoor temperatures;
drawing a three-dimensional curve according to the collected data;
determining a fitted function model according to the three-dimensional curve;
solving unknowns in the function model to obtain a fitting function。
The temperature and frequency estimated time model and the temperature maintenance minimum frequency model are adopted for cooling and heating, and the frequency calculation can be estimated by adopting the same model because the temperature rise or the temperature fall are different between the temperature estimated time model and the temperature maintenance minimum frequency model.
The data indexes of the refrigeration process are calculated as follows:
the calculation of the high-frequency cooling operation temperature includes the steps of:
acquiring a target refrigeration temperature A and an indoor temperature B;
according to the golden section ratioCalculating to obtain->；
C is the high-frequency cooling operation temperature.
The calculation method of the lowest central air conditioner refrigerating frequency of the indoor temperature to be reduced to the high-frequency refrigerating operation temperature in the preset refrigerating time I comprises the following steps:
obtaining preset refrigeration time D, high-frequency refrigeration running temperature C and indoor temperature B, and assuming the lowest central air conditioner refrigeration frequency E;
fitting function substituted into temperature and frequency estimated time modelIn (3) obtaining the target equation；
Calculating an estimated value of E through a target equation, and obtaining the first lowest central air conditioner refrigerating frequency;
here the number of the elements is the number,it may not be a conventional polynomial function that solves for a non-corresponding root equation, and therefore, adopts a dichotomy to solve for the estimate of E;
the method comprises the following steps:
step one: will beBecome->Here, except E, the remainder is a known quantity, let +.>，/>As a function of E, its zero point is required;
step two: making outEstimating the zero range thereof, in the vicinity of which +.>And->Is satisfied withHere, do not consider +.>If this occurs, the calculation is terminated, the calculation +.>And->There must be one less than 0 between them, which is not a hindrance to the +.>Then keep +.>The value of (2) is unchanged, will->Value of +.>；
Step three: obtaining a new productAnd->Continuing to repeat the second step until +.>Until now, add->As an estimate of E, since E must belong to +.>Between, therefore->Error from E is less than->The precision is enough, if the actual demand precision is higher, repeating the second step, and reducing the precision to any demand value;
step four: during the calculation, if encounteringIf (1) then determining that the product is 0Or->Is zero.
The calculation shows that the cooling frequency II of the lowest central air conditioner, which is cooled to the target cooling temperature by the high-frequency cooling operation temperature, in the preset cooling time II comprises the following steps:
obtaining preset refrigeration time II G, high-frequency refrigeration running temperature C and target refrigeration temperature A, and assuming the lowest central air conditioner refrigeration frequency II to be H;
fitting function substituted into temperature and frequency estimated time modelIn (3) obtaining the conditional equation；
And calculating an estimated value of H by a condition equation and adopting a dichotomy method, so as to obtain the second lowest central air conditioner refrigerating frequency.
Calculating the lowest central air conditioning refrigeration frequency III for maintaining the current target refrigeration temperature comprises the following steps:
acquiring an outdoor temperature I and a target refrigeration temperature A;
fitting function into temperature maintenance minimum frequency modelAnd obtaining the lowest central air conditioner refrigerating frequency III.
The data indexes of the heating process are calculated as follows:
the calculation of the high-frequency heating operation temperature includes the steps of:
acquiring a target heating temperature J and an indoor temperature B;
according to the golden section ratioCalculating to obtain->；
K is the high-frequency heating operation temperature.
The calculation shows that the lowest central air conditioner heating frequency I of the indoor temperature rising to the high-frequency heating operation temperature in the preset heating time I comprises the following steps:
obtaining preset heating time d, high-frequency heating operation temperature c and indoor temperature B, and assuming that the lowest central air conditioner heating frequency e;
fitting function substituted into temperature and frequency estimated time modelIn (3) obtaining a fitting equation；
And calculating an estimated value of E by adopting a fitting equation and adopting a dichotomy method, so as to obtain the first lowest central air-conditioning heat frequency.
The calculation shows that the lowest central air conditioner heating frequency II which is obtained by heating the high-frequency heating operation temperature to the target heating temperature in the preset heating time II comprises the following steps:
obtaining preset heating time II g, high-frequency heating operation temperature c and target heating temperature J, and assuming that the lowest central air conditioner heating frequency II is h;
fitting function substituted into temperature and frequency estimated time modelIn (3), obtaining a marginal equation；
And calculating an estimated value of h by adopting a binary method through a marginal equation, and obtaining the lowest central air conditioner thermal frequency II.
Calculating a lowest central air conditioner heating frequency III for maintaining the current target heating temperature comprises the following steps:
acquiring an outdoor temperature I and a target heating temperature J;
fitting function into temperature maintenance minimum frequency modelThe lowest central air conditioner thermal frequency three is obtained.
An intelligent energy-saving variable frequency control system of a central air conditioner is used for realizing the intelligent energy-saving variable frequency control method of the central air conditioner, and comprises the following steps:
the data collection module is used for collecting data for establishing a temperature and frequency estimated time model and establishing a temperature maintenance minimum frequency model;
the model building module is used for building a temperature and frequency estimated time model and building a temperature maintenance minimum frequency model;
the mode switching module is used for receiving a central air conditioner control instruction, judging whether the central air conditioner adopts a refrigerating or heating mode, and adjusting the central air conditioner mode according to a judging result;
the operation module is used for calculating a high-frequency refrigerating operation temperature and a high-frequency heating operation temperature, and calculating a first lowest central air conditioning refrigerating frequency, a second lowest central air conditioning refrigerating frequency, a third lowest central air conditioning refrigerating frequency, a first lowest central air conditioning heating frequency, a second lowest central air conditioning heating frequency and a third lowest central air conditioning heating frequency according to the established temperature and frequency estimated time model and the established temperature maintenance minimum frequency model;
the frequency conversion control module is used for performing intelligent energy-saving frequency conversion on the central air conditioner.
The intelligent energy-saving variable frequency control system of the central air conditioner has the following working processes:
step one: the data collection module collects different temperature change values, the central air conditioner operating frequency and the estimated time corresponding to the different temperature change values and the central air conditioner operating frequency, and the model building module builds a temperature and frequency estimated time model according to the collected data;
step two: the data collection module collects different outdoor temperatures, indoor temperatures and the lowest frequencies corresponding to the different outdoor temperatures and the indoor temperatures, and the model building module builds a temperature maintenance lowest frequency model according to the collected data;
step three: the mode switching module receives a central air conditioner control instruction, judges whether the central air conditioner adopts a refrigerating or heating mode, and adjusts the central air conditioner mode according to a judging result;
step four: if the central air conditioner refrigerates, the mode switching module is switched to a refrigerating mode, the operation module calculates the high-frequency refrigerating operation temperature, the operation module estimates a time model according to the temperature and the frequency to obtain the lowest central air conditioner refrigerating frequency I, the variable frequency control module operates at the lowest central air conditioner refrigerating frequency I and cools to the high-frequency refrigerating operation temperature, the operation module calculates the lowest central air conditioner refrigerating frequency II according to the temperature and the frequency to estimate the time model, the variable frequency control module operates at the lowest central air conditioner refrigerating frequency II and cools to the target refrigerating temperature to obtain the outdoor temperature, the operation module maintains the lowest frequency model according to the temperature to calculate the lowest central air conditioner refrigerating frequency III, and the variable frequency control module operates at the lowest central air conditioner refrigerating frequency III and maintains the target refrigerating temperature;
step five: if the central air conditioner heats, the mode switching module is switched to a heating mode, the operation module calculates the high-frequency heating operation temperature, the operation module calculates the lowest central air conditioner heating frequency I according to the temperature and the frequency estimated time model, the variable frequency control module operates at the lowest central air conditioner heating frequency I and heats to the high-frequency heating operation temperature, the operation module calculates the lowest central air conditioner heating frequency II according to the temperature and the frequency estimated time model, the variable frequency control module operates at the lowest central air conditioner heating frequency II and heats to the target heating temperature to obtain the outdoor temperature, the operation module maintains the lowest frequency model according to the temperature and calculates the lowest central air conditioner heating frequency III, and the variable frequency control module operates at the lowest central air conditioner heating frequency III and maintains the target heating temperature.
Still further, the present solution also proposes a storage medium, on which a computer readable program is stored, and when the computer readable program is called, the above-mentioned intelligent energy-saving frequency conversion control method of the central air conditioner is executed.
It is understood that the storage medium may be a magnetic medium, e.g., floppy disk, hard disk, magnetic tape; optical media such as DVD; or a semiconductor medium such as a solid state disk SolidStateDisk, SSD, etc.
In summary, the invention has the advantages that: through setting up data collection module, model establishment module, operation module and frequency conversion control module, to the central air conditioning operational environment of different circumstances, set up different high frequency refrigeration operating temperature or high frequency and heat operating temperature, and its high frequency operating frequency carries out corresponding change along with the temperature is different, guarantee that it is when reaching refrigeration or heating effect, the power consumption is also less, simultaneously, after reaching high frequency refrigeration operating temperature or high frequency and heat operating temperature, set up corresponding low frequency operating frequency, operate to target refrigeration temperature or target heating temperature, ensure that the power consumption is less, in addition, overall outdoor temperature and indoor temperature, obtain central air conditioning and maintain the minimum frequency of temperature, avoid using higher frequency, consume extra electric power.
The foregoing has shown and described the basic principles, principal features and advantages of the invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, and that the above embodiments and descriptions are merely illustrative of the principles of the present invention, and various changes and modifications may be made therein without departing from the spirit and scope of the invention, which is defined by the appended claims. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (3)
1. An intelligent energy-saving variable frequency control method for a central air conditioner is characterized by comprising the following steps:
establishing a temperature and frequency estimated time model, wherein the establishing of the temperature and frequency estimated time model comprises the following steps:
taking the temperature change value and the central air conditioner operating frequency as independent variables, and taking the estimated time of the indoor temperature change amplitude as the temperature change value as the dependent variables;
collecting different temperature change values, central air conditioner operating frequencies and corresponding estimated time by big data;
drawing a three-dimensional curve according to the collected data;
determining a fitted function model according to the three-dimensional curve;
solving unknowns in the function model to obtain a fitting function；
Establishing a temperature maintenance minimum frequency model, wherein the establishing of the temperature maintenance minimum frequency model comprises the following steps:
taking the outdoor temperature and the indoor temperature as independent variables, and taking the lowest frequency for maintaining the indoor temperature as the dependent variable;
the big data are collected to obtain different outdoor temperatures and indoor temperatures and the lowest frequency corresponding to the different outdoor temperatures and the indoor temperatures;
drawing a three-dimensional curve according to the collected data;
determining a fitted function model according to the three-dimensional curve;
solving unknowns in the function model to obtain a fitting function；
Obtaining a central air conditioner control instruction and judging the refrigeration or heating of the central air conditioner;
if the central air conditioner refrigerates, acquiring a target refrigerating temperature, acquiring an indoor temperature, and calculating a high-frequency refrigerating operation temperature according to the golden section ratio;
the calculation of the high-frequency cooling operation temperature includes the steps of:
acquiring a target refrigeration temperature A and an indoor temperature B;
according toRatio of golden sectionCalculating to obtain->；
C is the high-frequency refrigeration operation temperature;
according to the temperature and frequency estimated time model, calculating to obtain the lowest central air conditioner refrigerating frequency I of which the indoor temperature is reduced to the high-frequency refrigerating operation temperature within the preset refrigerating time I;
the calculation method of the lowest central air conditioner refrigerating frequency of the indoor temperature to be reduced to the high-frequency refrigerating operation temperature in the preset refrigerating time I comprises the following steps:
obtaining preset refrigeration time D, high-frequency refrigeration running temperature C and indoor temperature B, and assuming the lowest central air conditioner refrigeration frequency E;
fitting function substituted into temperature and frequency estimated time modelIn (3) obtaining the target equation；
Calculating an estimated value of E through a target equation, and obtaining the first lowest central air conditioner refrigerating frequency;
the first lowest central air conditioning refrigerating frequency is used for operation, the temperature is reduced to the high-frequency refrigerating operation temperature, and the second lowest central air conditioning refrigerating frequency, in which the high-frequency refrigerating operation temperature is reduced to the target refrigerating temperature, is calculated in the second preset refrigerating time according to the temperature and the frequency estimated time model;
the calculation shows that the cooling frequency II of the lowest central air conditioner, which is cooled to the target cooling temperature by the high-frequency cooling operation temperature, in the preset cooling time II comprises the following steps:
obtaining preset refrigeration time II G, high-frequency refrigeration running temperature C and target refrigeration temperature A, and assuming the lowest central air conditioner refrigeration frequency II to be H;
fitting function substituted into temperature and frequency estimated time modelIn (3) obtaining the conditional equation；
Calculating an estimated value of H through a conditional equation, and obtaining a second lowest central air conditioner refrigerating frequency;
operating at the second lowest central air conditioning refrigerating frequency, cooling to a target refrigerating temperature, acquiring outdoor temperature, maintaining a lowest frequency model according to the temperature, and calculating the third lowest central air conditioning refrigerating frequency maintaining the current target refrigerating temperature;
calculating the lowest central air conditioning refrigeration frequency III for maintaining the current target refrigeration temperature comprises the following steps:
acquiring an outdoor temperature I and a target refrigeration temperature A;
fitting function into temperature maintenance minimum frequency modelObtaining the lowest central air conditioner refrigerating frequency III;
the method comprises the steps of operating at the lowest central air conditioning refrigerating frequency three, and maintaining a target refrigerating temperature;
wherein the first preset refrigerating time is less than one third of the second preset refrigerating time;
if the central air conditioner is heated, acquiring a target heating temperature, acquiring an indoor temperature, and calculating a high-frequency heating operation temperature according to the golden section ratio;
the calculation of the high-frequency heating operation temperature includes the steps of:
acquiring a target heating temperature J and an indoor temperature B;
according to the golden section ratioCalculating to obtain->；
K is the high-frequency heating operation temperature;
calculating a lowest central air conditioner heating frequency I from which the indoor temperature rises to the high-frequency heating operation temperature in a preset heating time I according to the temperature and frequency estimated time model;
the calculation shows that the lowest central air conditioner heating frequency I of the indoor temperature rising to the high-frequency heating operation temperature in the preset heating time I comprises the following steps:
obtaining preset heating time d, high-frequency heating operation temperature c and indoor temperature B, and assuming that the lowest central air conditioner heating frequency e;
fitting function substituted into temperature and frequency estimated time modelIn (3) obtaining a fitting equation；
Calculating an estimated value of E by a fitting equation and adopting a dichotomy method, so as to obtain the first lowest central air-conditioning heat frequency;
operating at the first lowest central air conditioning heating frequency, heating to a high-frequency heating operation temperature, and calculating to obtain the second lowest central air conditioning heating frequency at which the high-frequency heating operation temperature is heated to the target heating temperature in the second preset heating time according to the temperature and frequency estimated time model;
the calculation shows that the lowest central air conditioner heating frequency II which is obtained by heating the high-frequency heating operation temperature to the target heating temperature in the preset heating time II comprises the following steps:
obtaining preset heating time II g, high-frequency heating operation temperature c and target heating temperature J, and assuming that the lowest central air conditioner heating frequency II is h;
fitting function substituted into temperature and frequency estimated time modelIn (3), obtaining a marginal equation；
Calculating an estimated value of h by adopting a binary method through a marginal equation, and obtaining a second lowest central air-conditioning heat frequency;
operating at the lowest central air conditioning heating frequency II, heating to the target heating temperature, acquiring outdoor temperature, maintaining a lowest frequency model according to the temperature, and calculating the lowest central air conditioning heating frequency III for maintaining the current target heating temperature;
calculating a lowest central air conditioner heating frequency III for maintaining the current target heating temperature comprises the following steps:
acquiring an outdoor temperature I and a target heating temperature J;
fitting function into temperature maintenance minimum frequency modelObtaining the lowest central air conditioner thermal frequency III;
the three operation of the lowest central air conditioner heating frequency is adopted to maintain the target heating temperature;
wherein the first preset heating time is less than one third of the second preset heating time.
2. An intelligent energy-saving variable frequency control system of a central air conditioner for realizing the intelligent energy-saving variable frequency control method of the central air conditioner as claimed in claim 1, which is characterized by comprising the following steps:
the data collection module is used for collecting data for establishing a temperature and frequency estimated time model and establishing a temperature maintenance minimum frequency model;
the model building module is used for building a temperature and frequency estimated time model and building a temperature maintenance minimum frequency model;
the mode switching module is used for receiving a central air conditioner control instruction, judging whether the central air conditioner adopts a refrigerating or heating mode, and adjusting the central air conditioner mode according to a judging result;
the operation module is used for calculating a high-frequency refrigerating operation temperature and a high-frequency heating operation temperature, and calculating a first lowest central air conditioning refrigerating frequency, a second lowest central air conditioning refrigerating frequency, a third lowest central air conditioning refrigerating frequency, a first lowest central air conditioning heating frequency, a second lowest central air conditioning heating frequency and a third lowest central air conditioning heating frequency according to the established temperature and frequency estimated time model and the established temperature maintenance minimum frequency model;
the frequency conversion control module is used for performing intelligent energy-saving frequency conversion on the central air conditioner.
3. A storage medium having a computer-readable program stored thereon, wherein the computer-readable program when invoked performs the intelligent energy-saving variable frequency control method of a central air conditioner according to claim 1.
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