CN110986263A - Control system, method and application of photovoltaic direct-drive variable frequency air conditioner cooling equipment - Google Patents
Control system, method and application of photovoltaic direct-drive variable frequency air conditioner cooling equipment Download PDFInfo
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- CN110986263A CN110986263A CN201911124883.6A CN201911124883A CN110986263A CN 110986263 A CN110986263 A CN 110986263A CN 201911124883 A CN201911124883 A CN 201911124883A CN 110986263 A CN110986263 A CN 110986263A
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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
- F24F11/32—Responding to malfunctions or emergencies
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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
- F24F11/70—Control systems characterised by their outputs; Constructional details thereof
- F24F11/80—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air
- F24F11/83—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling the supply of heat-exchange fluids to heat-exchangers
- F24F11/84—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling the supply of heat-exchange fluids to heat-exchangers using valves
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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
- F24F11/70—Control systems characterised by their outputs; Constructional details thereof
- F24F11/80—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air
- F24F11/86—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling compressors within refrigeration or heat pump circuits
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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
- F24F11/88—Electrical aspects, e.g. circuits
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/34—Parallel operation in networks using both storage and other dc sources, e.g. providing buffering
- H02J7/35—Parallel operation in networks using both storage and other dc sources, e.g. providing buffering with light sensitive cells
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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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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/50—Photovoltaic [PV] energy
- Y02E10/56—Power conversion systems, e.g. maximum power point trackers
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Abstract
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 is used for driving an air conditioner main machine air conditioner compressor to refrigerate; in the conversion process, the frequency converter can generate heat, and the heat is dissipated and cooled through photovoltaic cooling equipment; detecting the voltage change of the photovoltaic direct-current bus, prejudging the unit operation mode into a night operation mode and a day operation mode, and identifying the unit working state after the unit operation mode is confirmed to be finished so as to control the operation frequency of the cooling equipment compressor to reach the junction temperature of the quick response regulation frequency converter module in different regions and control the refrigerant circulation quantity. According to the invention, the junction temperature of the frequency converter module is adjusted in real time according to the change of the output power of the frequency converter, the circulation volume of a refrigerant is accurately controlled, the supercooling and overheating adjustment is avoided, the safe and stable operation of the photovoltaic direct-drive frequency converter is ensured, and the reliability of cooling equipment is improved.
Description
Technical Field
The invention belongs to the technical field of cooling equipment control, and particularly relates to a system and a method for controlling cooling equipment of a photovoltaic direct-drive variable frequency air conditioner and application of the system and the method.
Background
Currently, the closest prior art: 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 has the advantages that photovoltaic direct current is directly merged into a direct current bus of a converter unit of a converter of a unit set, so that the effect of converting photovoltaic energy into direct drive is achieved, and in the conversion process, a converter module (comprising a rectifier module and an inverter module) generates a large amount of heat; at present, the conventional cooling and heat dissipation mode of a photovoltaic frequency converter module is as follows: the photovoltaic cooling equipment is transmitted through the temperature of the detection module to control the refrigerant to flow in the copper pipe in the module so as to directly absorb the heat of the frequency converter for heat dissipation. The technology has the following defects that the quick change of photovoltaic voltage and the dynamic requirement of the air conditioner compressor load cannot be responded in real time, when the system switches the photovoltaic heavy load operation, the temperature of a cooling plate is increased sharply due to the fact that the switching frequency of a frequency converter is higher, and the amount of refrigerant is controlled through temperature detection; the temperature sensor performs data acquisition once every few seconds, so that lag exists, the average temperature of the frequency converter module can only be obtained, the real-time transient temperature 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, the temperature is too high, and the performance of the frequency converter is influenced; when the system switches photovoltaic small-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; the supercooling adjustment causes the return liquid to affect the reliability of the cooling apparatus.
The reliability of the working of the frequency converter is 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. The current loss of the current devices in the working process of the frequency converter 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 influenced 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 summary, the problems of the prior art are as follows:
(1) the existing photovoltaic direct-drive variable frequency air conditioning system is easy to adjust supercooling and overheating by controlling the circulation volume of a refrigerant.
(2) The existing photovoltaic direct-drive variable frequency air conditioning system has poor reliability of cooling equipment.
Disclosure of Invention
Aiming at the problems in the prior art, the invention provides a control system, a control method and application of a cooling device of a photovoltaic direct-drive variable frequency air conditioner.
The invention is realized in such a way that a control method of a cooling device of a photovoltaic direct-drive variable frequency air conditioner comprises the following steps:
the method comprises the following steps that firstly, solar energy is converted into electric energy by photovoltaic panels, energy of the photovoltaic panels is converged by a convergence unit, and the electric energy converted by the photovoltaic panels drives an air conditioner main unit air conditioner compressor to refrigerate through a frequency converter so as to provide power for the air conditioner main unit; in the conversion process, the frequency converter can generate a large amount of heat, and the heat is dissipated and cooled through photovoltaic cooling equipment;
and secondly, detecting the voltage change of the photovoltaic direct-current bus, prejudging the unit operation mode into a night operation mode and a day operation mode, and identifying the unit working state after the unit operation mode is confirmed to be finished so as to control the operation frequency of the compressor of the cooling equipment to reach the junction temperature of the quick response regulation frequency converter module in different areas and control the refrigerant circulation volume.
Further, the control method of the cooling device of the photovoltaic direct-drive variable frequency air conditioner further comprises the following steps: after the unit is powered on, the system enters an initialization state, power grid detection is carried out, direct-current bus open-circuit voltage of a power grid and a photovoltaic cell panel is detected, the unit operation mode is judged, when the direct-current bus open-circuit voltage Voc is detected to be less than or equal to A, the unit operation mode is judged to be a night operation mode M1, photovoltaic power Pmf is 0, the unit completely supplies power to mains supply, at the moment, the unit is in a pure mains supply operation state N1, the rectifier module of the frequency converter generates a large amount of heat when the unit is started to operate, the compressor initialization frequency of cooling equipment is directly increased to a maximum frequency P1max, the speed of a refrigerant is accelerated and controlled to directly absorb the heat of the frequency converter in a copper pipe flow speed in the module to carry out rapid heat dissipation, when the frequency converter module is reduced to a preset temperature interval value T1 module +/-3 ℃, the frequency modulation and frequency reduction processing is, and when the exhaust superheat Pt of the compressor of the cooling device is less than or equal to Y1 ℃, and the temperature T2 of the current frequency converter rectification module is less than or equal to a preset temperature interval value T1 module +/-3 ℃, entering an exhaust superheat control mode, controlling the opening of an electronic expansion valve EXV, and adjusting the circulation amount of a system refrigerant.
Further, the control method of the cooling device of the photovoltaic direct-drive variable frequency air conditioner further comprises the following steps: when the open-circuit voltage Voc of the direct current bus is detected to be more than A, a unit operation mode daytime operation mode M2 is judged, the photovoltaic power generation power and the air conditioner power consumption power Pmp are detected, when the photovoltaic power generation power Pmf is less than or equal to 5kW and the air conditioner power consumption power Pmp is 0, the unit is in a pure photovoltaic working state N2, the unit is started to operate a frequency converter rectification module to generate extremely small heat, a compressor of cooling equipment operates according to the minimum frequency P2min, when the frequency converter rectification module exceeds a preset temperature interval value T1 module +/-3 ℃, the frequency of the compressor of the cooling equipment is subjected to frequency modulation and frequency boosting according to a T1 module target value, the flow speed of a refrigerant in a copper pipe in the module is controlled, the exhaust superheat degree of the compressor of the cooling equipment is less than or equal to Y1 ℃, and when the current temperature T2 of the frequency converter rectification module is less than or equal to the preset temperature interval value T1 module +/-3 ℃, the exhaust, the opening of the electronic expansion valve EXV is controlled to adjust the circulation volume of the system refrigerant.
Further, the control method of the cooling device of the photovoltaic direct-drive variable frequency air conditioner further comprises the following steps: when the open-circuit voltage Voc of the direct current bus is detected to be more than A, the daytime running mode M2 of the running mode of the unit is judged, the photovoltaic power generation power and the power consumption Pmp of the air conditioner are detected, when the photovoltaic power generation power Pmf is less than the power consumption Pmp of the air conditioner, the unit is in a mixed power supply working state N3, the unit is started to run a frequency converter rectification module to generate extremely small heat, at the moment, a compressor of cooling equipment runs according to intermediate frequency P3min, when the frequency converter rectification module exceeds a preset temperature interval value T1 module +/-3 ℃, the frequency of the compressor of the cooling equipment is subjected to frequency modulation processing according to a T1 module target value to control the flow rate of a refrigeration medium in the module, the exhaust superheat degree of the compressor of the cooling equipment is less than or equal to Y1 ℃, and when the temperature T2 of the current frequency converter rectification module is less than or equal to the preset temperature interval value T1 module +/-3 ℃, the exhaust superheat degree, and adjusting the circulation volume of the system refrigerant.
Further, the control method of the cooling device of the photovoltaic direct-drive variable frequency air conditioner further comprises the following steps: when the open-circuit voltage Voc of the direct current bus is detected to be more than A, the day operation mode M2 of the unit operation mode is judged, the photovoltaic power generation power and the air conditioner power consumption power Pmp are detected, when the photovoltaic power generation power Pmf is more than the air conditioner power consumption power Pmp, the unit is in a bidirectional power supply working state N4, the unit is started to operate the frequency converter rectification module to generate extremely small heat, a compressor of the cooling device operates according to the middle large load frequency P4min, when the frequency converter rectification module exceeds a preset temperature interval value T1 module +/-3 ℃, the frequency of the compressor of the cooling device is subjected to frequency modulation according to a T1 module target value, the flow speed of a refrigerant in the module is controlled, the exhaust superheat degree of the compressor of the cooling device is less than or equal to Y1 ℃, and when the temperature T2 of the current frequency converter rectification module is less than or equal to the preset temperature interval value T1 module +/-3 ℃, the exhaust superheat degree control mode is entered, the, and adjusting the circulation volume of the system refrigerant.
Another object of the present invention is to provide a control system for a cooling device of a photovoltaic direct-drive variable frequency air conditioner, which implements the control method for a cooling device of a photovoltaic direct-drive variable frequency air conditioner, the control system for a cooling device of a photovoltaic direct-drive variable frequency air conditioner comprising:
the solar energy conversion module is used for collecting solar energy and converting the solar energy into electric energy;
the electric energy collection module is used for collecting the energy of the electric energy converted by the photovoltaic panels;
the electric energy sending module is used for driving the air conditioner main machine air conditioner compressor to refrigerate by the electric energy converted by the solar energy conversion module, providing power for the air conditioner main machine, and generating electricity to a power grid through the main machine through the frequency converter when the main machine does not work or the electricity generation is surplus;
and the heat dissipation and cooling module is used for generating heat by the electric energy sending module in the conversion process and performing heat dissipation and cooling through the photovoltaic cooling equipment.
The invention also aims to provide an information data processing terminal for realizing the control method of the cooling equipment of the photovoltaic direct-drive variable frequency air conditioner.
Another object of the present invention is to provide a computer-readable storage medium, which includes instructions that, when executed on a computer, cause the computer to execute the control method of the cooling device of the photovoltaic direct-drive inverter air conditioner.
The invention also aims to provide application of the control method of the cooling equipment of the photovoltaic direct-drive variable frequency air conditioner in a photovoltaic direct-drive variable frequency air conditioner system.
The invention also aims to provide application of the control method of the photovoltaic direct-drive variable frequency air conditioner cooling equipment in electric appliance control.
In summary, the advantages and positive effects of the invention are: the method judges the unit operation mode by detecting the change of the photovoltaic voltage, and prejudges the junction temperature change of the frequency converter module in advance; confirming the power supply working state of the unit by detecting the change of the power, controlling the frequency of a compressor of the cooling equipment in different regions, and accurately adjusting the junction temperature of a frequency converter module; the opening of the electronic expansion valve is controlled by detecting the junction temperature change of the frequency converter module, the circulation quantity of a system refrigerant is properly adjusted, the evaporation speed of the refrigerant is increased, the quantity of liquid refrigerant sucked by the compressor is reduced, and then the liquid refrigerant of the exhaust pipe is controlled.
According to the invention, the junction temperature of the frequency converter module is adjusted in real time according to the change of the output power of the frequency converter, the circulation volume of a refrigerant is accurately controlled, the supercooling and overheating adjustment is avoided, the safe and stable operation of the photovoltaic direct-drive frequency converter is ensured, and the reliability of cooling equipment is improved.
Drawings
FIG. 1 is a schematic structural diagram of a control system of a cooling device of a photovoltaic direct-drive variable-frequency air conditioner, provided by an embodiment of the invention;
in the figure: 1. a solar energy conversion module; 2. an electric energy collection module; 3. an electric energy sending module; 4. and a heat dissipation cooling module.
Fig. 2 is a flowchart of a control method of a cooling device of a photovoltaic direct-drive variable-frequency air conditioner, which is provided by the embodiment of the invention.
Fig. 3 is a schematic diagram of a control system of a cooling device of a photovoltaic direct-drive variable-frequency air conditioner according to an embodiment of the present invention.
Fig. 4 is a flowchart of an implementation of a control method for a cooling device of a photovoltaic direct-drive variable-frequency air conditioner according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail with reference to the following embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Aiming at the problems in the prior art, the invention provides a control system and a control method for a cooling device of a photovoltaic direct-drive variable frequency air conditioner, and the invention is described in detail with reference to the attached drawings.
As shown in fig. 1, a control system of a cooling device of a photovoltaic direct-drive variable-frequency air conditioner provided by an embodiment of the present invention includes:
the solar energy conversion module 1 is used for collecting solar energy and converting the solar energy into electric energy.
And the electric energy collecting module 2 is used for collecting the energy of the electric energy converted by the photovoltaic panels.
And the electric energy sending module 3 is used for driving the electric energy converted by the solar energy conversion module 1 to refrigerate the air conditioner main unit air conditioner compressor, providing power for the air conditioner main unit, and generating power to a power grid through the main unit through a frequency converter when the main unit does not work or surplus power is generated.
And the heat dissipation and cooling module 4 is used for generating a large amount of heat by the electric energy sending module 3 in the conversion process and performing heat dissipation and cooling through photovoltaic cooling equipment.
As shown in fig. 2, the method for controlling the cooling device of the photovoltaic direct-drive variable frequency air conditioner provided by the embodiment of the invention comprises the following steps:
s201: the photovoltaic panel converts solar energy into electric energy, the converging unit converges the energy of the photovoltaic panels together, and the electric energy converted by the photovoltaic panels drives an air conditioner main unit air conditioner compressor to refrigerate through the frequency converter so as to provide power for the air conditioner main unit; in the conversion process, the frequency converter can generate a large amount of heat, and heat dissipation and cooling are needed to be carried out through photovoltaic cooling equipment.
S202: and detecting the voltage change of the photovoltaic direct-current bus, prejudging the unit operation modes to be a night operation mode and a day operation mode, and further identifying the unit working state after the unit operation mode is confirmed to be finished so as to control the operation frequency of the compressor of the cooling equipment to reach the junction temperature of the frequency converter module in a quick response way in different regions and accurately control the refrigerant circulation quantity.
The technical solution of the present invention is further described below with reference to the accompanying drawings.
As shown in fig. 3, a photovoltaic panel of a control system of a photovoltaic direct-drive variable frequency air conditioner cooling device provided by the embodiment of the present invention: the photovoltaic panel converts 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, power is provided for the air conditioner main unit, and the power can be generated to a power grid through the frequency converter when the main unit does not work or the power generation is surplus, so that the effect of direct driving 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 photovoltaic cooling equipment.
As shown in fig. 4, the method for controlling a cooling device of a photovoltaic direct-drive variable-frequency air conditioner according to an embodiment of the present invention pre-determines that the unit operation mode includes a night operation mode and a day operation mode by detecting a change in a voltage of a photovoltaic direct-current bus, and further identifies the unit operation state after the unit operation mode is determined, so as to control the operation frequency of a compressor of the cooling device in different intervals to achieve a fast response and adjust the junction temperature of a frequency converter module, thereby accurately controlling the refrigerant circulation.
(1) After a unit is electrified, a system enters an initialization state to carry out power grid detection, direct-current bus open-circuit voltages of a power grid and a photovoltaic cell panel are detected, a unit operation mode is judged, when the detected direct-current bus open-circuit voltage Voc is less than or equal to A, the unit operation mode is judged to be a night operation mode M1, photovoltaic power generation power Pmf is 0, the unit completely supplies power to mains supply, at the moment, the unit is in a pure mains supply working state N1, a rectifier module of a frequency converter generates a large amount of heat when the unit is started to operate, the initialization frequency of a compressor of cooling equipment is directly increased to the maximum frequency [ P1max ], the flow speed of a refrigerant in a module copper pipe is accelerated and controlled to directly absorb the heat of the frequency converter for rapid heat dissipation, the phenomenon that the temperature of the rectifier module is sharply increased due to the fact that the switching frequency of the frequency converter is larger when the unit is in operation under a large load is avoided, frequency modulation and frequency reduction treatment are carried out on the frequency of a compressor of the cooling equipment according to a target value of a T1 module, the flow speed of a refrigeration medium in a copper tube in the module is controlled, if the exhaust superheat Pt of the compressor of the cooling equipment is less than or equal to Y1 ℃, and the temperature T2 of a current frequency converter rectification module is less than or equal to a preset temperature interval value T1 module +/-3 ℃, the compressor of the cooling equipment enters an exhaust superheat control mode preferentially, the opening degree of an electronic expansion valve EXV is controlled, the circulation quantity of a system refrigerant is adjusted appropriately, the opening degree of the current electronic expansion valve EXV is maintained after the exhaust superheat Pt is higher than Y1 ℃, the problems of condensation and cooling equipment liquid return caused by supercooling are avoided, and the frequency converter module is;
(2) when the open-circuit voltage Voc of the direct current bus is detected to be more than A, a unit operation mode daytime operation mode M2 is judged, the photovoltaic power generation power and the air conditioner power consumption power Pmp are detected, when the photovoltaic power generation power Pmf is less than or equal to 5kW and the air conditioner power consumption power Pmp is 0, the unit is in a pure photovoltaic power generation working state N2, the unit starts to operate the frequency converter rectification module to generate extremely small heat, at the moment, a compressor of the cooling device operates according to the minimum frequency [ P2min ], when the frequency converter rectification module exceeds a preset temperature interval value T1 module +/-3 ℃ (the T1 module is adjustable), the frequency of the compressor of the cooling device is subjected to frequency modulation and frequency boosting according to a T1 module target value, the flow rate of a refrigeration medium in the module is controlled, if the exhaust superheat degree of the compressor of the cooling device is less than or equal to Y1 ℃, and the current temperature T2 of the frequency converter rectification module is less than or equal to the preset temperature interval value T39, the method preferentially enters an exhaust superheat degree control mode, the opening degree of the electronic expansion valve EXV is controlled, the circulating quantity of a system refrigerant is properly adjusted, the opening degree of the current electronic expansion valve EXV is maintained after the exhaust superheat degree Pt is higher than Y1 ℃, and the problems of condensation and liquid return of cooling equipment caused by supercooling are avoided.
(3) When the open-circuit voltage Voc of the direct current bus is detected to be more than A, a unit operation mode daytime operation mode M2 is judged, the photovoltaic power generation power and the air conditioner power consumption power Pmp are detected, when the photovoltaic power generation power Pmf is less than the air conditioner power consumption power Pmp, the unit is in a mixed power supply working state N3, the unit is started to operate a frequency converter rectification module to generate extremely small heat, a compressor of cooling equipment operates according to an intermediate frequency P3min, when the frequency converter rectification module exceeds a preset temperature interval value T1 module +/-3 ℃ (the T1 module is adjustable), the frequency of the compressor of the cooling equipment is subjected to frequency modulation processing according to a T1 module target value to control the flow speed of a refrigeration medium in a copper pipe in the module, if the exhaust superheat degree of the compressor of the cooling equipment is less than or equal to Y1 ℃, and the current temperature T2 of the frequency converter rectification module is less than or equal to the preset temperature interval value T1 module +/-3 ℃, the exhaust superheat degree control, the opening degree of the electronic expansion valve EXV is controlled, the circulation amount of a system refrigerant is properly adjusted, the opening degree of the current electronic expansion valve EXV is maintained after the exhaust superheat degree Pt is higher than Y1 ℃, and the problems of condensation and liquid return of cooling equipment caused by supercooling are avoided.
(4) When the open-circuit voltage Voc of a direct current bus is detected to be more than A, a unit operation mode daytime operation mode M2 is judged, meanwhile, the photovoltaic power generation power and the air conditioner power consumption power Pmp are detected, when the photovoltaic power generation power Pmf is more than the air conditioner power consumption power Pmp, the unit is in a bidirectional power supply working state N4, when the unit is started, a frequency converter rectification module generates extremely small heat, a compressor of cooling equipment operates according to a middle heavy load frequency P4min, when the frequency converter rectification module exceeds a preset temperature interval value T1 module +/-3 ℃ (T1 module is adjustable), the frequency of the compressor of the cooling equipment is subjected to frequency modulation processing according to a T1 module target value, the flow speed of a refrigeration medium in a copper pipe in the module is controlled, for example, the exhaust superheat degree of the compressor of the cooling equipment is less than or equal to Y1 ℃, and when the current temperature T2 of the frequency converter rectification module is less than or equal to the preset temperature interval value T1 module +/-3 ℃, the exhaust, the opening degree of the electronic expansion valve EXV is controlled, the circulation amount of a system refrigerant is properly adjusted, the opening degree of the current electronic expansion valve EXV is maintained after the exhaust superheat degree is higher than Y1 ℃, and the problems of condensation and liquid return of cooling equipment caused by supercooling are avoided.
In the present invention, Voc: open circuit voltage of the direct current bus; pmf: photovoltaic power generation power; pmp: the power consumed by the air conditioner; m1: a night operation mode; m2: a daytime running mode; n1: the unit is in a pure commercial power working state; n2: a pure photovoltaic power generation working state; n3: the unit is in a hybrid power supply working state; n4: the unit is in a bidirectional power supply working state; t1: a temperature interval value preset by the frequency device module; t2: the current temperature of the frequency converter rectification module; [ P1max ]: maximum compressor frequency of the cooling device; [ P2max ]: minimum compressor frequency of the cooling device; [ P3max ]: compressor intermediate frequency of the cooling device; [ P4max ]: the compressor medium maximum load frequency of the cooling device; pt: the degree of superheat of the exhaust gas.
It should be noted that the embodiments of the present invention can be realized by hardware, software, or a combination of software and hardware. The hardware portion may be implemented using dedicated logic; the software portions may be stored in a memory and executed by a suitable instruction execution system, such as a microprocessor or specially designed hardware. Those skilled in the art will appreciate that the apparatus and methods described above may be implemented using computer executable instructions and/or embodied in processor control code, such code being provided on a carrier medium such as a disk, CD-or DVD-ROM, programmable memory such as read only memory (firmware), or a data carrier such as an optical or electronic signal carrier, for example. The apparatus and its modules of the present invention may be implemented by hardware circuits such as very large scale integrated circuits or gate arrays, semiconductors such as logic chips, transistors, or programmable hardware devices such as field programmable gate arrays, programmable logic devices, etc., or by software executed by various types of processors, or by a combination of hardware circuits and software, e.g., firmware.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.
Claims (10)
1. A control method for cooling equipment of a photovoltaic direct-drive variable frequency air conditioner is characterized by comprising the following steps:
the method comprises the following steps that firstly, solar energy is converted into electric energy by photovoltaic panels, energy of the photovoltaic panels is converged by a convergence unit, and the electric energy converted by the photovoltaic panels drives an air conditioner main unit air conditioner compressor to refrigerate through a frequency converter so as to provide power for the air conditioner main unit; in the conversion process, the frequency converter can generate a large amount of heat, and the heat is dissipated and cooled through photovoltaic cooling equipment;
and secondly, detecting the voltage change of the photovoltaic direct-current bus, prejudging the unit operation mode into a night operation mode and a day operation mode, and identifying the unit working state after the unit operation mode is confirmed to be finished so as to control the operation frequency of the compressor of the cooling equipment to reach the junction temperature of the quick response regulation frequency converter module in different areas and control the refrigerant circulation volume.
2. The method for controlling the cooling equipment of the photovoltaic direct-drive variable-frequency air conditioner as claimed in claim 1, wherein the method for controlling the cooling equipment of the photovoltaic direct-drive variable-frequency air conditioner further comprises: after the unit is powered on, the system enters an initialization state, power grid detection is carried out, direct-current bus open-circuit voltage of a power grid and a photovoltaic cell panel is detected, the unit operation mode is judged, when the direct-current bus open-circuit voltage Voc is detected to be less than or equal to A, the unit operation mode is judged to be a night operation mode M1, photovoltaic power Pmf is 0, the unit completely supplies power to mains supply, at the moment, the unit is in a pure mains supply operation state N1, the rectifier module of the frequency converter generates a large amount of heat when the unit is started to operate, the compressor initialization frequency of cooling equipment is directly increased to a maximum frequency P1max, the speed of a refrigerant is accelerated and controlled to directly absorb the heat of the frequency converter in a copper pipe flow speed in the module to carry out rapid heat dissipation, when the frequency converter module is reduced to a preset temperature interval value T1 module +/-3 ℃, the frequency modulation and frequency reduction processing is, and when the exhaust superheat Pt of the compressor of the cooling device is less than or equal to Y1 ℃, and the temperature T2 of the current frequency converter rectification module is less than or equal to a preset temperature interval value T1 module +/-3 ℃, entering an exhaust superheat control mode, controlling the opening of an electronic expansion valve EXV, and adjusting the circulation amount of a system refrigerant.
3. The method for controlling the cooling equipment of the photovoltaic direct-drive variable-frequency air conditioner as claimed in claim 1, wherein the method for controlling the cooling equipment of the photovoltaic direct-drive variable-frequency air conditioner further comprises: when the open-circuit voltage Voc of the direct current bus is detected to be more than A, a unit operation mode daytime operation mode M2 is judged, the photovoltaic power generation power and the air conditioner power consumption power Pmp are detected, when the photovoltaic power generation power Pmf is less than or equal to 5kW and the air conditioner power consumption power Pmp is 0, the unit is in a pure photovoltaic working state N2, the unit is started to operate a frequency converter rectification module to generate extremely small heat, a compressor of cooling equipment operates according to the minimum frequency P2min, when the frequency converter rectification module exceeds a preset temperature interval value T1 module +/-3 ℃, the frequency of the compressor of the cooling equipment is subjected to frequency modulation and frequency boosting according to a T1 module target value, the flow speed of a refrigerant in a copper pipe in the module is controlled, the exhaust superheat degree of the compressor of the cooling equipment is less than or equal to Y1 ℃, and when the current temperature T2 of the frequency converter rectification module is less than or equal to the preset temperature interval value T1 module +/-3 ℃, the exhaust, the opening of the electronic expansion valve EXV is controlled to adjust the circulation volume of the system refrigerant.
4. The method for controlling the cooling equipment of the photovoltaic direct-drive variable-frequency air conditioner as claimed in claim 1, wherein the method for controlling the cooling equipment of the photovoltaic direct-drive variable-frequency air conditioner further comprises: when the open-circuit voltage Voc of the direct current bus is detected to be more than A, the daytime running mode M2 of the running mode of the unit is judged, the photovoltaic power generation power and the power consumption Pmp of the air conditioner are detected, when the photovoltaic power generation power Pmf is less than the power consumption Pmp of the air conditioner, the unit is in a mixed power supply working state N3, the unit is started to run a frequency converter rectification module to generate extremely small heat, at the moment, a compressor of cooling equipment runs according to intermediate frequency P3min, when the frequency converter rectification module exceeds a preset temperature interval value T1 module +/-3 ℃, the frequency of the compressor of the cooling equipment is subjected to frequency modulation processing according to a T1 module target value to control the flow rate of a refrigeration medium in the module, the exhaust superheat degree of the compressor of the cooling equipment is less than or equal to Y1 ℃, and when the temperature T2 of the current frequency converter rectification module is less than or equal to the preset temperature interval value T1 module +/-3 ℃, the exhaust superheat degree, and adjusting the circulation volume of the system refrigerant.
5. The method for controlling the cooling equipment of the photovoltaic direct-drive variable-frequency air conditioner as claimed in claim 1, wherein the method for controlling the cooling equipment of the photovoltaic direct-drive variable-frequency air conditioner further comprises: when the open-circuit voltage Voc of the direct current bus is detected to be more than A, the day operation mode M2 of the unit operation mode is judged, the photovoltaic power generation power and the air conditioner power consumption power Pmp are detected, when the photovoltaic power generation power Pmf is more than the air conditioner power consumption power Pmp, the unit is in a bidirectional power supply working state N4, the unit is started to operate the frequency converter rectification module to generate extremely small heat, a compressor of the cooling device operates according to the middle large load frequency P4min, when the frequency converter rectification module exceeds a preset temperature interval value T1 module +/-3 ℃, the frequency of the compressor of the cooling device is subjected to frequency modulation according to a T1 module target value, the flow speed of a refrigerant in the module is controlled, the exhaust superheat degree of the compressor of the cooling device is less than or equal to Y1 ℃, and when the temperature T2 of the current frequency converter rectification module is less than or equal to the preset temperature interval value T1 module +/-3 ℃, the exhaust superheat degree control mode is entered, the, and adjusting the circulation volume of the system refrigerant.
6. A control system for a cooling device of a photovoltaic direct-drive variable frequency air conditioner for implementing the control method for the cooling device of the photovoltaic direct-drive variable frequency air conditioner as claimed in any one of claims 1 to 5, wherein the control system for the cooling device of the photovoltaic direct-drive variable frequency air conditioner comprises:
the solar energy conversion module is used for collecting solar energy and converting the solar energy into electric energy;
the electric energy collection module is used for collecting the energy of the electric energy converted by the photovoltaic panels;
the electric energy sending module is used for driving the air conditioner main machine air conditioner compressor to refrigerate by the electric energy converted by the solar energy conversion module, providing power for the air conditioner main machine, and generating electricity to a power grid through the main machine through the frequency converter when the main machine does not work or the electricity generation is surplus;
and the heat dissipation and cooling module is used for generating heat by the electric energy sending module in the conversion process and performing heat dissipation and cooling through the photovoltaic cooling equipment.
7. An information data processing terminal for realizing the control method of the cooling equipment of the photovoltaic direct-drive variable frequency air conditioner as claimed in any one of claims 1 to 5.
8. A computer readable storage medium comprising instructions which, when run on a computer, cause the computer to perform the method of controlling a photovoltaic direct drive inverter air conditioning cooling apparatus as claimed in any one of claims 1 to 5.
9. Application of the control method of the cooling equipment of the photovoltaic direct-drive variable frequency air conditioner as claimed in any one of claims 1 to 5 in a photovoltaic direct-drive variable frequency air conditioning system.
10. Application of the control method of the photovoltaic direct-drive variable frequency air conditioner cooling equipment as claimed in any one of claims 1-5 in electric appliance control.
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