CN114269118B - Photovoltaic air conditioner heat dissipation system, photovoltaic air conditioner and control method of photovoltaic air conditioner - Google Patents
Photovoltaic air conditioner heat dissipation system, photovoltaic air conditioner and control method of photovoltaic air conditioner Download PDFInfo
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- 230000017525 heat dissipation Effects 0.000 title claims abstract description 75
- 238000000034 method Methods 0.000 title claims abstract description 38
- 238000001816 cooling Methods 0.000 claims abstract description 86
- 238000001514 detection method Methods 0.000 claims abstract description 12
- 239000000110 cooling liquid Substances 0.000 claims description 36
- 238000004378 air conditioning Methods 0.000 claims description 33
- 239000002826 coolant Substances 0.000 claims description 14
- 239000003507 refrigerant Substances 0.000 claims description 11
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- 230000006978 adaptation Effects 0.000 description 1
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Abstract
The invention discloses a photovoltaic air conditioner cooling system, a photovoltaic air conditioner and a control method thereof, wherein the photovoltaic air conditioner cooling system comprises: the heat radiator comprises a heat radiation pipeline, wherein a converter of the photovoltaic air conditioner is arranged on the heat radiator and adopts the heat radiation pipeline for heat radiation; the temperature detection module is used for detecting the temperature parameters of the converter; the converter comprises a rectifier and an inverter; the temperature parameter of the current transformer comprises one of the following: temperature parameters of the rectifier and the inverter; and the cooler is connected with the radiator and used for providing cooling capacity for the radiator according to the temperature parameters of the converter. The invention solves the problems that the heat dissipation system of the photovoltaic air conditioner in the prior art adopts two sets of cooling loops, is complex to control and large in size, and cannot quickly and accurately respond to the temperature change of the converter, and the heat dissipation system is simple and low in cost, can quickly and accurately respond to the temperature change of the converter, and improves the heat dissipation effect.
Description
Technical Field
The invention relates to the technical field of photovoltaic air conditioners, in particular to a photovoltaic air conditioner heat dissipation system, a photovoltaic air conditioner and a control method of the photovoltaic air conditioner.
Background
The high-power converter of the photovoltaic air-conditioning system is cooled by a refrigerant, and heat generated by an IGBT module in the converter can be taken away by the air-conditioning refrigerant. The IGBT module of the existing photovoltaic air conditioner needing heat dissipation is mainly positioned in a converter, and the converter is divided into a rectifier and an inverter. When the air conditioning system is not turned on, the system also needs to dissipate heat when operating in the photovoltaic power generation mode, so that the heat dissipation system of the existing photovoltaic air conditioner comprises a grid-side converter unit (inverter) heat dissipation system and a machine-side converter unit (rectifier) heat dissipation system, the grid-side converter unit is cooled by a cooler, and the machine-side converter unit is cooled by a refrigerant of an air conditioning unit, so that the cooling of the photovoltaic air conditioning system is realized, as shown in fig. 1. The photovoltaic air conditioning system can be cooled by the scheme, but two cooling loops are needed, the cooling system is complex, and the radiator in the converter also needs two loops. On the occasion of medium and low power that a cooling system can cool the whole photovoltaic air conditioner converter, if two cooling loops are adopted, the problems that the two cooling loops are complex to control and the internal occupied volume is large exist.
In addition, the existing control scheme adopts a temperature feedback control cooler, so that the problems of slow response and incapability of quickly and accurately responding to temperature change when the photovoltaic power suddenly changes exist.
Aiming at the problems that in the prior art, a heat dissipation system of a photovoltaic air conditioner adopts two sets of cooling loops, is complex to control and large in size, and cannot quickly and accurately respond to temperature change of a converter, an effective solution is not provided at present.
Disclosure of Invention
The invention provides a photovoltaic air conditioner heat dissipation system, a photovoltaic air conditioner and a control method thereof, and at least solves the problems that in the prior art, the heat dissipation system of the photovoltaic air conditioner adopts two sets of cooling loops, is complex to control and large in size, and cannot quickly and accurately respond to temperature change of a converter.
To solve the above technical problem, according to an aspect of an embodiment of the present invention, there is provided a photovoltaic air conditioner heat dissipation system, including:
the radiator comprises a radiating pipeline, wherein the converter of the photovoltaic air conditioner is arranged on the radiator and adopts the radiating pipeline to radiate heat;
the temperature detection module is used for detecting the temperature parameter of the converter; the converter comprises a rectifier and an inverter; the temperature parameter of the converter comprises one of the following: temperature parameters of the rectifier, temperature parameters of the rectifier and the inverter;
and the cooler is connected with the radiator and used for providing cooling capacity for the radiator according to the temperature parameters of the converter.
Further, the photovoltaic air conditioner comprises the following operation modes: an air conditioner and photovoltaic simultaneous operation mode and an independent photovoltaic operation mode; when the photovoltaic air conditioner is in an air conditioner and photovoltaic simultaneous operation mode, the cooler is used for adjusting the flow of a refrigerant in the heat dissipation pipeline and/or the operation frequency of a compressor of the cooler according to the temperature parameters of the rectifier and the inverter and providing cooling capacity for heat dissipation for the radiator; when the photovoltaic air conditioner is in an independent photovoltaic operation mode, the cooler is used for adjusting the flow of a refrigerant in the heat dissipation pipeline and/or the operation frequency of a compressor of the cooler according to the temperature parameters of the rectifier so as to provide cooling capacity for heat dissipation for the radiator.
Further, the temperature detection module includes: the first temperature sensor assembly is used for detecting a temperature parameter of the rectifier; and the second temperature sensor assembly is used for detecting the temperature parameter of the inverter.
Further, the first temperature sensor assembly includes one or more temperature sensors for detecting module temperatures of the respective IGBT modules of the rectifier; the second temperature sensor assembly includes one or more temperature sensors for detecting module temperatures of the respective IGBT modules of the inverter.
Further, one or more temperature sensors of the first temperature sensor assembly are arranged in one-to-one correspondence with the IGBT modules of the rectifier; one or more temperature sensors of the second temperature sensor assembly are arranged in one-to-one correspondence with the respective IGBT modules of the inverter.
According to another aspect of the embodiment of the invention, a photovoltaic air conditioner is provided, which comprises the photovoltaic air conditioner heat dissipation system.
According to another aspect of the embodiments of the present invention, there is provided a photovoltaic air conditioner control method, applied to the photovoltaic air conditioner as described above, the method including:
detecting an operation mode of the photovoltaic air conditioner; wherein the operation modes at least comprise an air conditioner and photovoltaic simultaneous operation mode and an individual photovoltaic operation mode;
detecting temperature parameters of the converter according to the operation mode;
and controlling the operation of the photovoltaic air-conditioning heat dissipation system according to the temperature parameters.
Further, detecting the temperature parameter of the converter according to the operation mode comprises the following steps: when the operation mode is the air conditioner and photovoltaic simultaneous operation mode, acquiring the temperature of the rectifier and the temperature of the inverter, and determining temperature parameters according to the temperature of the rectifier and the temperature of the inverter;
and when the operation mode is the single photovoltaic operation mode, acquiring the temperature of the inverter, and determining the temperature parameter according to the temperature of the inverter.
Further, the temperature of the rectifier is the module temperature of each IGBT module of the rectifier; the temperature of the inverter is the module temperature of each IGBT module of the inverter; determining a temperature parameter based on the temperature of the rectifier and the temperature of the inverter, comprising: calculating the average value of the module temperature of each IGBT module of the rectifier and the module temperature of each IGBT module of the inverter as a temperature parameter;
determining a temperature parameter from a temperature of the inverter, comprising: and calculating the average value of the module temperature of each IGBT module of the inverter as the temperature parameter.
Further, the operation of the photovoltaic air-conditioning heat dissipation system is controlled according to the temperature parameters, and the method comprises the following steps: determining the compressor operating frequency of the cooler and the cooling liquid flow of the heat dissipation system corresponding to the temperature parameters according to the temperature parameters; the operation of the compressor of the chiller is controlled according to the compressor operating frequency, and the opening degree of the coolant control valve of the chiller is controlled according to the coolant flow rate.
Further, after controlling the operation of the photovoltaic air-conditioning cooling system according to the temperature parameter, the method further comprises the following steps: detecting the current of the current transformer, and calculating the change parameters of the current; wherein, the variation parameter at least comprises one of the following parameters: the amount of change in current, the rate of change in current; and controlling the operation of the photovoltaic air-conditioning heat dissipation system according to the variation parameters.
Further, according to the operation of the variable parameter control photovoltaic air conditioner cooling system, include: when the variation parameter is positive, controlling the frequency of a compressor of the cooler to increase, and/or controlling the opening of a cooling liquid control valve of the cooler to increase; when the variation parameter is negative, the frequency of a compressor controlling the cooling machine is reduced, and/or the opening degree of a cooling liquid control valve controlling the cooling machine is reduced.
Further, after the frequency of the compressor of the cooling machine is controlled to be increased and/or the opening degree of the cooling liquid control valve of the cooling machine is controlled to be increased, the method further comprises the following steps: detecting whether the frequency of the compressor reaches a maximum frequency and the opening of the coolant control valve reaches a maximum opening; if so, controlling to reduce the operating frequency of the converter; otherwise, keeping the running frequency of the converter; after controlling the frequency of the compressor of the cooling machine to reduce and/or controlling the opening degree of the cooling liquid control valve of the cooling machine to reduce, the method further comprises the following steps: detecting whether the frequency of the compressor reaches a minimum frequency and the opening of the coolant control valve reaches a minimum opening; if yes, controlling the photovoltaic air conditioner cooling system to stand by; otherwise, the current operation parameters of the photovoltaic air-conditioning heat dissipation system are kept.
According to yet another aspect of an embodiment of the present invention, there is provided a storage medium containing computer-executable instructions for performing the photovoltaic air conditioning control method as described above when executed by a computer processor.
The invention provides a photovoltaic air conditioner radiating system, wherein a rectifier and an inverter of a photovoltaic air conditioner are arranged on a radiator at the same time, a set of heat exchange system is adopted, and cooling liquid in a radiating pipeline of the heat exchange system is used for radiating heat, so that the problems of complex control and large size due to the fact that two sets of cooling loops are adopted in the radiating system of the photovoltaic air conditioner are avoided, the radiating system is simple, the cost is low, and the radiating requirement of the medium-and-small-power photovoltaic air conditioner can be met. And the cooling machine is also provided with a temperature detection module for detecting the temperature parameter of the converter and adjusting the cooling machine according to the temperature parameter of the converter, so that the problem that the existing cooling system cannot quickly and accurately respond to the temperature change of the converter is solved, the temperature change of the converter is quickly and accurately responded, and the cooling effect is improved.
Drawings
Fig. 1 is a schematic diagram of an alternative configuration of a photovoltaic air conditioning heat dissipation system according to the prior art;
fig. 2 is an alternative structural schematic diagram of a photovoltaic air-conditioning heat dissipation system according to an embodiment of the invention;
FIG. 3 is an alternative flow chart of a control method for a photovoltaic air conditioner according to an embodiment of the invention;
fig. 4 is another alternative flowchart of a photovoltaic air conditioner control method according to an embodiment of the invention.
Detailed Description
Reference will now be made in detail to the exemplary embodiments, examples of which are illustrated in the accompanying drawings. The following description refers to the accompanying drawings in which the same numbers in different drawings represent the same or similar elements unless otherwise indicated. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present invention. Rather, they are merely examples of apparatus and methods consistent with certain aspects of the present invention.
Example 1
The IGBT module of the existing photovoltaic air conditioner needing heat dissipation is mainly positioned in a converter, and the converter is divided into a rectifier and an inverter. When the air conditioning system is not turned on, the system also needs to dissipate heat when operating in the photovoltaic power generation mode, so that the heat dissipation system of the existing photovoltaic air conditioner comprises a grid-side converter unit (inverter) heat dissipation system and a machine-side converter unit (rectifier) heat dissipation system, the grid-side converter unit is cooled by a cooler, and the machine-side converter unit is cooled by a refrigerant of an air conditioning unit, so that the cooling of the photovoltaic air conditioning system is realized, as shown in fig. 1. The photovoltaic air conditioning system can be cooled by the scheme, but two cooling loops are needed, the cooling system is complex, and the radiator in the converter also needs two loops.
In a preferred embodiment 1 of the present invention, a photovoltaic air conditioning cooling system is provided, and specifically, fig. 2 shows an alternative structural schematic diagram of the unit, as shown in fig. 2, the unit includes:
the radiator 1 comprises a radiating pipeline, and cooling liquid is arranged in the radiating pipeline; the converter of the photovoltaic air conditioner, namely the rectifier and the inverter, is arranged on the radiator, and cooling liquid in the heat dissipation pipeline is used for heat dissipation. The cooling liquid enters the heat dissipation pipeline from the radiator inlet 2 and flows out of the heat dissipation pipeline from the radiator outlet 3. As shown in fig. 2, the heat dissipation pipeline can be uniformly laid, and each IGBT module of the rectifier (including IGBT modules 1 to 3, corresponding to numbers 4 to 6 in fig. 2) and each IGBT module of the inverter (including IGBT modules 4 to 6, corresponding to numbers 7 to 9 in fig. 2) exchange heat with the heat exchange pipeline uniformly;
the temperature detection module is used for detecting the temperature parameter of the converter; wherein, the temperature parameter of the converter comprises one of the following: temperature parameters of the rectifier (temperature of the IGBT modules 1-3), rectifier and inverter (temperature of the IGBT modules 1-6);
and the cooler is connected with the radiator and used for providing cooling capacity for the radiator according to the temperature parameters of the converter.
In the above embodiment, a photovoltaic air conditioner cooling system is provided, in which a rectifier and an inverter of a photovoltaic air conditioner are simultaneously disposed on a radiator, and a set of heat exchange system is adopted, and cooling liquid in a cooling pipeline of the heat exchange system is used for cooling, so that the problems that the control is complex and the size is large due to the fact that two sets of cooling loops are adopted in the photovoltaic air conditioner cooling system are solved. And the cooling machine is also provided with a temperature detection module for detecting the temperature parameter of the converter and adjusting the cooling machine according to the temperature parameter of the converter, so that the problem that the existing cooling system cannot quickly and accurately respond to the temperature change of the converter is solved, the temperature change of the converter is quickly and accurately responded, and the cooling effect is improved.
For a photovoltaic air conditioner, which is a high-power electrical appliance, the radiator cannot meet the heat dissipation function. Therefore, in order to provide enough cold energy, the radiator is also connected with a cooler, the cooler is a machine for providing flowing of a refrigerant in the heat exchange pipeline, and in the use process, the flow of the cooling liquid and/or the frequency of the compressor can be adjusted by the cooler according to the temperature parameters, so that the heat dissipation system can respond to the temperature change of the converter more quickly and accurately, and the heat dissipation effect is improved.
The photovoltaic air conditioner comprises the following operation modes: an air conditioner and photovoltaic simultaneous operation mode and an independent photovoltaic operation mode; when the photovoltaic air conditioner is in the air conditioner and photovoltaic simultaneous operation mode, the cooler is used for adjusting the flow of a refrigerant in the heat dissipation pipeline and/or the operation frequency of a compressor of the cooler according to the temperature parameters of the rectifier and the inverter and providing cooling capacity for heat dissipation for the radiator; when the photovoltaic air conditioner is in an independent photovoltaic operation mode, the cooler is used for adjusting the flow of a refrigerant in the heat dissipation pipeline and/or the operation frequency of a compressor of the cooler according to the temperature parameters of the rectifier so as to provide cooling capacity for heat dissipation for the radiator.
In addition, in order to accurately detect the temperature parameter of the current transformer, the temperature detection module comprises: a first temperature sensor assembly for detecting a temperature parameter of the rectifier; a second temperature sensor assembly for detecting a temperature parameter of the inverter.
The first temperature sensor assembly comprises one or more temperature sensors, is arranged in one-to-one correspondence with each IGBT module of the rectifier and is used for detecting the module temperature of each IGBT module of the rectifier; as shown in FIG. 2, the first temperature sensor assembly includes sensors T1-T3, corresponding to numerals 10-12 in FIG. 2; and a second temperature sensor assembly including one or more temperature sensors disposed in one-to-one correspondence with the respective IGBT modules of the inverter for detecting the module temperature of the respective IGBT modules of the inverter, as shown in fig. 2, the second temperature sensor assembly including sensors T4 to T6 corresponding to reference numerals 13 to 15 in fig. 2. The temperature of each IGBT module is detected through the temperature sensor, and the operation of the heat dissipation system is adjusted according to the module temperature, so that the control of the heat dissipation system is more adaptive to the actual temperature condition of the heat dissipation system, and the heat dissipation requirement is met.
Example 2
Based on the photovoltaic air conditioner heat dissipation system provided in the above embodiment 1, there is also provided in a preferred embodiment 2 of the present invention a photovoltaic air conditioner, including the photovoltaic air conditioner heat dissipation system as in the above embodiment 1.
In the above embodiment, a photovoltaic air conditioner cooling system is provided, in which a rectifier and an inverter of a photovoltaic air conditioner are simultaneously disposed on a radiator, and a set of heat exchange system is adopted, and cooling liquid in a cooling pipeline of the heat exchange system is used for cooling, so that the problems that the control is complex and the size is large due to two sets of cooling loops adopted by the photovoltaic air conditioner cooling system are avoided, the heat dissipation system is simple, the cost is low, and the heat dissipation requirement of the medium and low power photovoltaic air conditioner can be met. And the cooling machine is also provided with a temperature detection module for detecting the temperature parameter of the converter and adjusting the cooling machine according to the temperature parameter of the converter, so that the problem that the existing cooling system cannot quickly and accurately respond to the temperature change of the converter is solved, the temperature change of the converter is quickly and accurately responded, and the cooling effect is improved.
Example 3
In a preferred embodiment 3 of the present invention, a method for controlling a photovoltaic air conditioner is provided, which is applied to the photovoltaic air conditioner in the above embodiment 2. Specifically, fig. 3 shows an alternative flowchart of the method, and as shown in fig. 3, the method includes the following steps S302-S306:
s302: detecting an operation mode of the photovoltaic air conditioner; wherein the operation modes at least comprise an air conditioner and photovoltaic simultaneous operation mode and an individual photovoltaic operation mode;
s304: detecting temperature parameters of the converter according to the operation mode;
s306: and controlling the operation of the photovoltaic air-conditioning heat dissipation system according to the temperature parameters.
In the above embodiment, a photovoltaic air conditioner cooling system is provided, in which a rectifier and an inverter of a photovoltaic air conditioner are simultaneously disposed on a radiator, and a set of heat exchange system is adopted, and cooling liquid in a cooling pipeline of the heat exchange system is used for cooling, so that the problems that the control is complex and the size is large due to the fact that two sets of cooling loops are adopted in the photovoltaic air conditioner cooling system are solved. And the cooling machine is also provided with a temperature detection module for detecting the temperature parameter of the converter and adjusting the cooling machine according to the temperature parameter of the converter, so that the problem that the existing cooling system cannot quickly and accurately respond to the temperature change of the converter is solved, the temperature change of the converter is quickly and accurately responded, and the cooling effect is improved.
Detecting a temperature parameter of the converter according to the operation mode, comprising: detecting a temperature parameter of the converter according to the operation mode, comprising: when the operation mode is the air conditioner and photovoltaic simultaneous operation mode, acquiring the temperature of the rectifier and the temperature of the inverter, and determining temperature parameters according to the temperature of the rectifier and the temperature of the inverter; and when the operation mode is the single photovoltaic operation mode, acquiring the temperature of the inverter, and determining the temperature parameter according to the temperature of the inverter.
The temperature of the rectifier is the module temperature of each IGBT module of the rectifier; the temperature of the inverter is the module temperature of each IGBT module of the inverter; determining a temperature parameter based on the temperature of the rectifier and the temperature of the inverter, comprising: calculating the average value of the module temperature of each IGBT module of the rectifier and the module temperature of each IGBT module of the inverter as a temperature parameter; determining a temperature parameter from a temperature of the inverter, comprising: and calculating the average value of the module temperature of each IGBT module of the inverter as the temperature parameter.
When an independent photovoltaic system works, the IGBT modules 1-3 work, when the photovoltaic system and the air conditioning system work simultaneously, the IGBT modules 1-6 work, the existing processing scheme is to collect three temperatures of the inlet, the middle and the outlet of a radiator and transmit the temperatures to a controller, and the control of the frequency of a valve and a compressor of cooling liquid is carried out according to the maximum value of the temperatures. When the 6 modules work together, each module generates heat in a balanced mode, the control method has no problem, when only the photovoltaic system works, the IGBTs 1-3 work, the IGBTs 4-6 do not work, and the temperature of the IGBT4-6 which does not work is collected for controlling, so that the outlet temperature is continuously reduced, the valve of cooling liquid is reduced, and the frequency of the compressor is reduced. Meanwhile, when the temperature of the IGBTs 4-6 is stable, the temperature of the IGBTs 1-3 is increased, and the heat dissipation requirement cannot be met.
Under the condition, the control requirement of the radiator is linked with the state of the photovoltaic air conditioner, the starting state data of the photovoltaic air conditioner is sent to the cooler, when the photovoltaic air conditioner is in an independent photovoltaic operation mode, the temperature of the IGBT1-3 is collected and sent to the radiator, and when the photovoltaic air conditioner is in an air conditioner and photovoltaic simultaneous operation mode, the temperature of the IGBT1-6 is collected and sent to the radiator. The radiator can be correspondingly adjusted in temperature according to different operation modes.
Specifically, the operation of the photovoltaic air conditioner heat dissipation system is controlled according to the temperature parameters, and the method comprises the following steps: determining the compressor operating frequency of the cooler and the cooling liquid flow of the heat dissipation system corresponding to the temperature parameters according to the temperature parameters; the operation of the compressor of the chiller is controlled according to the compressor operating frequency, and the opening degree of the coolant control valve of the chiller is controlled according to the coolant flow rate. The corresponding relation between the temperature parameter and the running frequency of the compressor and the flow of the cooling liquid of the heat dissipation system can be preset, and after the temperature parameter is determined, the relevant control parameter can be determined through the corresponding relation.
After the operation of photovoltaic air conditioner and photovoltaic air conditioner cooling system is controlled according to the temperature parameter, still include: detecting the current of the current transformer, and calculating the change parameters of the current; wherein the variation parameter comprises at least one of: the amount of change in current, the rate of change in current; and controlling the operation of the photovoltaic air-conditioning heat dissipation system according to the change parameters. When photovoltaic power sudden change, original scheme coolant temperature rises suddenly, and it is slower that the radiator response can appear, can't keep up with temperature variation, leads to the system overtemperature. The current data of the converter are synchronously acquired by the existing scheme and are sent to the radiator, and the radiator adjusts and controls the temperature in advance according to the change slope of the current or the change quantity of the current, so that the adjustment advance is ensured. Any heating is reflected on the temperature after the current changes, so the temperature change is pre-judged in advance through the current change and is used for temperature control, and the response speed of the radiator is fastest.
In addition, according to the operation of the variable parameter control photovoltaic air conditioner cooling system, include: controlling the frequency of the compressor of the cooling machine to increase and/or controlling the opening of the cooling liquid control valve of the cooling machine to increase when the rate of change or the amount of change is a positive number; when the rate or amount of change is negative, the frequency of the compressor controlling the chiller is decreased, and/or the opening degree of the coolant control valve controlling the chiller is decreased. After controlling the frequency of the compressor of the cooling machine to increase and/or controlling the opening degree of the cooling liquid control valve of the cooling machine to increase, the method further comprises the following steps: detecting whether the frequency of the compressor reaches a maximum frequency and the opening of the coolant control valve reaches a maximum opening; if yes, controlling to reduce the operating frequency of the converter; otherwise, keeping the running frequency of the converter; after the frequency of the compressor of the cooler is controlled to be reduced and/or the opening degree of the cooling liquid control valve of the cooler is controlled to be reduced, the method further comprises the following steps: detecting whether the frequency of the compressor reaches a minimum frequency and the opening of the coolant control valve reaches a minimum opening; if so, controlling the photovoltaic air conditioner cooling system to stand by; otherwise, keeping the current operation parameters of the photovoltaic air-conditioning heat dissipation system.
When the operation of a photovoltaic air conditioner cooling system is controlled, detecting that a valve of a radiator cooling liquid control valve is opened to the maximum, and when the frequency of a compressor is adjusted to the maximum, if the temperature continues to rise, performing power limiting control on a converter; if the coolant control valve is detected to be closed to the minimum, the frequency of the compressor is reduced to the minimum, if the temperature is reduced, the radiator needs to be in a standby state, and the machine is started again for cooling after the temperature is increased. The control scheme ensures that the stable operation of the unit and the temperature of the converter module are not too high or too low.
In preferred embodiment 2 of the present invention, another photovoltaic air conditioner control method is further provided, and specifically, fig. 4 shows an optional flowchart of the method, and as shown in fig. 4, the method includes the following steps S401 to S413:
s401: starting;
s402: whether the converter is operated or not; if yes, go to steps S403 and S405, otherwise, go to step S413;
s403: judging whether the machine is just started to operate; if yes, go to step S404;
s404: starting the radiator in advance; pre-running the radiator in advance to quickly radiate when the radiator is required to radiate;
s405: judging whether the current of the converter has sudden change or not; the mutation has two cases, namely, a large case and a small case, if the mutation is large, the step is proceeded to step S406, and if the mutation is small, the step is proceeded to step S410;
s406: opening a large cooling liquid valve to increase the frequency of the compressor; the heat dissipation effect is improved by increasing the frequency of the cooling liquid valve and the compressor;
s407: judging whether the cooling liquid valve and the frequency are opened to the maximum; if yes, the step S409 is entered, otherwise, the step S408 is entered;
s408: the radiator operates according to normal operation logic; normal operation logic controls the operation of the chiller by means of the measured temperature parameters;
s409: the radiator normally operates, and the converter operates in a limited power mode; when detecting that the valve of the radiator cooling liquid control valve is opened to the maximum and the frequency of the compressor is adjusted to the maximum, if the temperature continues to rise, the converter needs to be subjected to power limiting control;
s410: the cooling liquid valve is reduced, and the frequency of the compressor is reduced; the frequency of a cooling liquid valve and a compressor is reduced, the heat dissipation rate is reduced, and the temperature of the converter is prevented from being too low;
s411: judging whether the cooling liquid valve and the frequency are opened to the minimum; if yes, go to step S412, otherwise, go to step S408;
s412: the converter normally operates, and the radiator is in standby; if the coolant control valve is detected to be closed to the minimum, the frequency of the compressor is reduced to the minimum, if the temperature is reduced, the radiator needs to be in standby, and the radiator is started to cool after the temperature is increased;
s413: and (5) shutting down the radiator.
Through the control scheme, the temperature of the converter is effectively adjusted, stable operation of the unit and the temperature of the converter module are guaranteed to be not too high or too low, and the heat dissipation cost is saved.
Example 4
Based on the photovoltaic air-conditioning control method provided in the above embodiment 3, there is also provided in a preferred embodiment 4 of the present invention a storage medium containing computer executable instructions which, when executed by a computer processor, are used to perform the photovoltaic air-conditioning control method as described above.
In the above embodiment, a photovoltaic air conditioner cooling system is provided, in which a rectifier and an inverter of a photovoltaic air conditioner are simultaneously disposed on a radiator, and a set of heat exchange system is adopted, and cooling liquid in a cooling pipeline of the heat exchange system is used for cooling, so that the problems that the control is complex and the size is large due to the fact that two sets of cooling loops are adopted in the photovoltaic air conditioner cooling system are solved. And the cooling machine is also provided with a temperature detection module for detecting the temperature parameter of the converter and adjusting the cooling machine according to the temperature parameter of the converter, so that the problem that the existing cooling system cannot quickly and accurately respond to the temperature change of the converter is solved, the temperature change of the converter is quickly and accurately responded, and the cooling effect is improved.
Other embodiments of the invention will be apparent to those skilled in the art from consideration of the specification and practice of the invention disclosed herein. This application is intended to cover any variations, uses, or adaptations of the invention following, in general, the principles of the invention and including such departures from the present disclosure as come within known or customary practice within the art to which the invention pertains. It is intended that the specification and examples be considered as exemplary only, with a true scope and spirit of the invention being indicated by the following claims.
It will be understood that the invention is not limited to the precise arrangements described above and shown in the drawings and that various modifications and changes may be made without departing from the scope thereof. The scope of the invention is limited only by the appended claims.
Claims (13)
1. The utility model provides a photovoltaic air conditioner cooling system which characterized in that includes:
the photovoltaic air conditioner comprises a radiator and a control unit, wherein the radiator comprises a radiating pipeline, a converter of the photovoltaic air conditioner is arranged on the radiator, and the radiating pipeline is adopted for radiating;
the temperature detection module is used for detecting the temperature parameters of the converter; wherein the converter comprises a rectifier and an inverter; the temperature parameter of the converter comprises one of the following: temperature parameters of the rectifier, temperature parameters of the rectifier and the inverter;
the cooler is connected with the radiator and used for providing cooling capacity for the radiator according to the temperature parameter of the converter;
the photovoltaic air conditioner comprises the following operation modes: an air conditioner and photovoltaic simultaneous operation mode and an independent photovoltaic operation mode; when the photovoltaic air conditioner is in the air conditioner and photovoltaic simultaneous operation mode, the cooler is used for adjusting the flow of a refrigerant in the heat dissipation pipeline and/or the operation frequency of a compressor of the cooler according to the temperature parameters of the rectifier and the inverter so as to provide cooling capacity for heat dissipation for the radiator; and when the photovoltaic air conditioner is in the independent photovoltaic operation mode, the cooler is used for adjusting the flow of the refrigerant in the heat dissipation pipeline and/or the operation frequency of a compressor of the cooler according to the temperature parameter of the rectifier so as to provide cooling capacity for heat dissipation for the radiator.
2. The photovoltaic air conditioning heat dissipation system of claim 1, wherein the temperature detection module comprises:
a first temperature sensor assembly for detecting a temperature parameter of the rectifier;
a second temperature sensor assembly for detecting a temperature parameter of the inverter.
3. The photovoltaic air conditioning heat dissipation system of claim 2,
the first temperature sensor assembly comprises one or more temperature sensors for detecting module temperatures of respective IGBT modules of the rectifier;
the second temperature sensor assembly includes one or more temperature sensors for detecting module temperatures of respective IGBT modules of the inverter.
4. The photovoltaic air conditioning heat dissipation system of claim 3,
one or more temperature sensors of the first temperature sensor assembly are arranged in one-to-one correspondence with the IGBT modules of the rectifier;
one or more temperature sensors of the second temperature sensor assembly are arranged in one-to-one correspondence with the IGBT modules of the inverter.
5. A photovoltaic air conditioner is characterized by comprising the photovoltaic air conditioner heat dissipation system according to any one of claims 1-4.
6. A photovoltaic air conditioner control method is applied to the photovoltaic air conditioner as claimed in claim 5, and is characterized by comprising the following steps:
detecting an operation mode of the photovoltaic air conditioner; wherein the operation modes at least comprise an air conditioner and photovoltaic simultaneous operation mode and an individual photovoltaic operation mode;
detecting temperature parameters of the converter according to the operation mode;
and controlling the operation of the photovoltaic air-conditioning heat dissipation system according to the temperature parameter.
7. The method of claim 6, wherein detecting a temperature parameter of the converter based on the operating mode comprises:
when the operation mode is the air conditioner and photovoltaic simultaneous operation mode, acquiring the temperature of a rectifier and the temperature of an inverter, and determining the temperature parameter according to the temperature of the rectifier and the temperature of the inverter;
and when the operation mode is the single photovoltaic operation mode, acquiring the temperature of the inverter, and determining the temperature parameter according to the temperature of the inverter.
8. The method of claim 7, wherein the temperature of the rectifier is a module temperature of each IGBT module of the rectifier; the temperature of the inverter is the module temperature of each IGBT module of the inverter; determining the temperature parameter from the temperature of the rectifier and the temperature of the inverter, including:
calculating an average value of the module temperature of each IGBT module of the rectifier and the module temperature of each IGBT module of the inverter as the temperature parameter;
determining the temperature parameter as a function of the temperature of the inverter, including:
calculating an average value of module temperatures of the IGBT modules of the inverter as the temperature parameter.
9. The method of claim 6, wherein controlling operation of the photovoltaic air conditioning heat dissipation system based on the temperature parameter comprises:
determining the compressor operating frequency of the cooler and/or the cooling liquid flow of the heat dissipation system corresponding to the temperature parameter according to the temperature parameter;
and controlling the operation of a compressor of the cooler according to the operation frequency of the compressor, and controlling the opening of a cooling liquid control valve of the cooler according to the flow rate of the cooling liquid.
10. The method of claim 6, further comprising, after controlling operation of the photovoltaic air conditioning heat dissipation system according to the temperature parameter:
detecting the current of the current transformer, and calculating the variation parameter of the current; wherein the variation parameter comprises at least one of: the amount of change in current, the rate of change in current;
and controlling the operation of the photovoltaic air conditioner heat dissipation system according to the change parameters.
11. The method of claim 10, wherein controlling the operation of the photovoltaic air conditioning heat dissipation system based on the varying parameter comprises:
when the change parameter is positive, controlling the frequency of a compressor of the cooler to increase, and/or controlling the opening of a cooling liquid control valve of the cooler to increase;
and when the change parameter is a negative number, controlling the frequency of a compressor of the cooler to be reduced, and/or controlling the opening degree of a cooling liquid control valve of the cooler to be reduced.
12. The method of claim 11,
after controlling the frequency of the compressor of the cooler to increase and/or controlling the opening degree of the cooling liquid control valve of the cooler to increase, the method further comprises the following steps:
detecting whether the frequency of the compressor reaches a maximum frequency and whether the opening of the coolant control valve reaches a maximum opening; if yes, controlling to reduce the operating frequency of the converter; otherwise, keeping the running frequency of the converter;
after controlling the frequency of the compressor of the cooler to decrease and/or controlling the opening degree of the cooling liquid control valve of the cooler to decrease, the method further comprises the following steps:
detecting whether the frequency of the compressor reaches a minimum frequency and the opening of the coolant control valve reaches a minimum opening; if so, controlling the photovoltaic air conditioner cooling system to stand by; otherwise, keeping the current operation parameters of the photovoltaic air-conditioning heat dissipation system.
13. A storage medium containing computer executable instructions for performing the method of any one of claims 6 to 12 when executed by a computer processor.
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| CN104638880B (en) * | 2013-11-08 | 2019-09-20 | 珠海格力电器股份有限公司 | Cooling system for converter and air-conditioner set with the cooling system for converter |
| CN109713881A (en) * | 2019-02-01 | 2019-05-03 | 广东美的暖通设备有限公司 | Frequency converter |
| CN209805650U (en) * | 2019-02-01 | 2019-12-17 | 广东美的暖通设备有限公司 | Frequency converter |
| CN110351987B (en) * | 2019-07-15 | 2024-02-23 | 珠海格力电器股份有限公司 | Radiator, controller, photovoltaic electric equipment and radiating method |
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Application publication date: 20220401 Assignee: Gree Electric Appliance (Ganzhou) Co.,Ltd. Assignor: GREE ELECTRIC APPLIANCES Inc. OF ZHUHAI Contract record no.: X2024980004336 Denomination of invention: Photovoltaic air conditioning cooling system, photovoltaic air conditioning and its control methods Granted publication date: 20230414 License type: Common License Record date: 20240412 |