Frequency converter heat dissipation control system and method

Abstract

The invention discloses a frequency converter heat dissipation control system and method. The method comprises a first direct-current circuit breaker, a second direct-current circuit breaker, a controller, a radiator, a cooling machine and an energy storage battery. The photovoltaic power generation panel is connected with the photovoltaic frequency converter through the first direct-current circuit breaker, the photovoltaic power generation panel is connected with the energy storage battery through the second direct-current circuit breaker, and the energy storage battery is connected with the photovoltaic frequency converter; the controller is connected with the first direct-current circuit breaker and the second direct-current circuit breaker, controls on and off of the first direct-current circuit breaker and the second direct-current circuit breaker, and switches a power supply connected with the photovoltaic frequency converter when the photovoltaic power generation panel enters different working conditions; and the cooling machine is connected with the radiator through a refrigerant loop and is used for cooling and radiating the photovoltaic frequency converter. According to the invention, photovoltaic power generation power fluctuation can be smoothed, and the problem of voltage impact caused by sudden increase and decrease of photovoltaic panel power generation is solved; the system reliability is improved, and temperature fault alarms are effectively reduced; and heat dissipation management in the frequency converter is optimized.

Description

Technical Field

[0001] The present invention belongs to the technical field of photovoltaic power generation, and more specifically, relates to a frequency converter heat dissipation control system and method based on peak-valley balance of photovoltaic power supply. Background Art

[0002] Under relatively stable sunlight conditions, the photovoltaic panels continue to generate power at a high and stable power level. The photovoltaic inverter drives the load by converting current, and an external chiller uses refrigerant to cool the inverter's internal modules. The chiller typically requires a certain startup time to drive its internal compressor, so there's a delay in the heat dissipation from the radiator reaching the inverter's internal modules. As the inverter's power increases, the chiller's power increases accordingly, and vice versa. If sunlight suddenly decreases, such as due to cloud cover, the power of both the inverter and chiller decreases rapidly to prevent overcooling of the modules. However, when sunlight returns, the inverter's power quickly recovers, while the chiller's power increases more slowly. This prevents the inverter's internal modules from cooling quickly enough, causing the modules to overheat and shut down.

[0003] That is to say, when the weather and light intensity change, the power generation of the photovoltaic panels will suddenly increase or decrease. Due to problems with the cooling hardware itself and the inverter's heat dissipation control logic, the cooling machine will not have time to quickly respond to frequency increase or decrease, causing the module inside the photovoltaic inverter to overheat.

[0004] For example, but not limited to, prior art document 1 (CN117335735A) discloses a solar photovoltaic power generation device with constant power output, which controls the expansion and contraction of the solar panel through mechanical control, sacrificing the maximum power generation efficiency of the photovoltaic panel to a certain extent. In particular, this technical solution does not control and optimize the heat dissipation of the photovoltaic inverter. When the heat generation of the equipment reaches a certain level, the photovoltaic inverter needs to use cooling equipment to ensure that the temperature of its core module is low and stable. Constant power solar power generation can only ensure stable heating of the photovoltaic inverter, but cannot ensure constant temperature of its internal module, and there is still a risk of overheating.

[0005] For example, prior art document 2 (CN112930075A) discloses a variable frequency drive cooling system, a device using a frequency converter, and a cooling control method, but its control strategy is not applicable to the situation where the power generation power of the photovoltaic frequency converter changes suddenly. Summary of the Invention

[0006] In order to address the deficiencies in the prior art, the present invention provides an inverter heat dissipation control system and method based on peak-valley balancing of photovoltaic power sources, which can smooth out fluctuations in photovoltaic power generation and solve the voltage shock problem caused by sudden increases and decreases in photovoltaic panel power generation; improve system reliability, and even if there are large fluctuations in photovoltaic panel power generation, it will not cause the internal module temperature of the inverter to overheat, thereby causing shutdown failures, effectively reducing temperature fault alarms; and optimize the heat dissipation management inside the inverter.

[0007] The present invention adopts the following technical solutions.

[0008] A first aspect of the present invention provides an inverter heat dissipation control system, comprising: first and second DC circuit breakers, a controller, a radiator, a cooler, and an energy storage battery;

[0009] The photovoltaic power generation panel is connected to the photovoltaic inverter via the first DC circuit breaker.

[0010] The photovoltaic panels are connected to the energy storage battery via the second DC circuit breaker.

[0011] The energy storage battery is connected to the photovoltaic inverter;

[0012] The controller is connected to the first and second DC circuit breakers to control the closing and opening of the first and second DC circuit breakers, and switches the power supply connected to the photovoltaic inverter when the photovoltaic panel enters different working conditions;

[0013] The cooler is connected to the radiator through a refrigerant circuit and is used to cool and dissipate heat for the photovoltaic inverter.

[0014] Preferably, the energy storage battery is a battery or a capacitor, and its rated discharge power does not exceed the maximum refrigeration capacity of the chiller.

[0015] A second aspect of the present invention provides a method for controlling heat dissipation of an inverter, based on the inverter heat dissipation control system according to the first aspect, comprising the following steps:

[0016] If the value of the rate of change K of the photovoltaic panel power within the set time is within the normal operating range, it is a normal operating condition, the first DC circuit breaker is closed, and the photovoltaic panel supplies power to the photovoltaic inverter;

[0017] If the value of the change rate K is outside the normal operating range, it is a photovoltaic power generation sudden change operating condition. Under the photovoltaic power generation sudden change operating condition, if the temperature of the photovoltaic inverter power device is abnormal, the first DC circuit breaker is disconnected and power is supplied to the photovoltaic inverter by the energy storage battery.

[0018] Preferably, under normal operating conditions, if the SOC of the energy storage battery is lower than a set value, the second DC circuit breaker is closed until the SOC of the energy storage battery reaches the set value, and then the second DC circuit breaker is opened.

[0019] Preferably, there is a margin between the set value and the maximum and minimum SOC values ​​of the energy storage battery. When the SOC of the energy storage battery is the set value, it can continue to charge to store the power of the photovoltaic panel, or can continue to discharge to supply power to the photovoltaic inverter.

[0020] Preferably, if the value of the change rate K is greater than the upper limit of the normal operating range, the photovoltaic power generation power surge condition is entered. If the temperature of the photovoltaic inverter power device exceeds the limit, the first DC circuit breaker is disconnected, and the second DC circuit breaker is closed or disconnected. The energy storage battery supplies power to the photovoltaic inverter at a discharge power that does not exceed the maximum cooling power of the chiller.

[0021] Preferably, if the value of the change rate K is greater than the upper limit of the normal operating range, the photovoltaic power generation power suddenly increases, the second DC circuit breaker is closed, and the energy storage battery shares the power generation power of the photovoltaic power generation panel. If the temperature of the power device of the photovoltaic inverter does not exceed the limit, the second DC circuit breaker is maintained closed during the photovoltaic power generation power sudden change condition.

[0022] Preferably, if the value of the change rate K is less than the lower limit of the normal operating range, the photovoltaic power generation power suddenly decreases, and if the temperature of the photovoltaic inverter power device exceeds the limit, the first DC circuit breaker is disconnected, and the energy storage battery supplies power to the photovoltaic inverter at a discharge power that does not exceed the maximum cooling power of the chiller.

[0023] The third aspect of the present invention provides an electronic device, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the computer program, when loaded into the processor, implements a method for controlling heat dissipation of an inverter according to the second aspect.

[0024] A fourth aspect of the present invention provides a computer-readable storage medium storing a computer program. When the computer program is executed by a processor, the method for controlling heat dissipation of an inverter according to the second aspect is implemented.

[0025] Compared with the prior art, the beneficial effects of the present invention include at least:

[0026] The present invention's inverter heat dissipation control system and method for peak-valley balancing of photovoltaic power supplies reduces the probability of photovoltaic power generation power drops and internal module overtemperature protection in photovoltaic inverters by 50%. Compared to traditional power generation control methods, this invention improves the stability of photovoltaic inverter systems. These failures typically occur during periods of high sunlight. Therefore, reducing downtime and increasing the system's continuous power generation duration effectively improves the photovoltaic inverter's power output conversion efficiency, resulting in significant economic benefits and environmental and energy-saving benefits. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 This is a block diagram of an inverter heat dissipation control system based on photovoltaic power peak-valley balance provided in accordance with an embodiment of the present invention;

[0028] Figure 2 This is a control logic flow chart of a normal operating condition of an inverter heat dissipation control system based on photovoltaic power peak-valley balance provided in accordance with an embodiment of the present invention;

[0029] Figure 3 The present invention provides a flow chart of control logic for a heat dissipation control system for a frequency converter based on peak-valley balance of a photovoltaic power source under conditions of sudden increase or decrease in photovoltaic power. DETAILED DESCRIPTION

[0030] To make the objectives, technical solutions, and advantages of the present invention more clear, the technical solutions of the present invention will be clearly and completely described below in conjunction with the accompanying drawings of the embodiments of the present invention. The described embodiments are only part of the embodiments of the present invention, not all of them. Based on the spirit of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative efforts are within the scope of protection of the present invention.

[0031] like Figure 1 As shown, embodiment 1 of the present invention provides an inverter heat dissipation control system based on peak-valley balance of photovoltaic power supply, including: first and second DC circuit breakers, a controller, a radiator, a cooler and an energy storage battery.

[0032] The photovoltaic power generation panel is connected to the photovoltaic inverter via the first DC circuit breaker QF1, the photovoltaic power generation panel is connected to the energy storage battery via the second DC circuit breaker QF2, and the energy storage battery is connected to the photovoltaic inverter; the controller is connected to the first and second DC circuit breakers to control the closing and opening of the first and second DC circuit breakers; the cooler is connected to the radiator through the refrigerant circuit to cool and dissipate heat for the photovoltaic inverter.

[0033] Preferably, but not restrictively, a conventional photovoltaic inverter is directly powered by a photovoltaic panel. The present invention adds a storage battery and a second DC circuit breaker QF2 between the photovoltaic power generation panel and the photovoltaic wiring port of the photovoltaic inverter. The energy storage battery can be a battery or a capacitor according to the power generation of the photovoltaic panel. Its main function is to store excess photovoltaic power generation and to realize the discharge function under the control of the controller; the first and second DC circuit breakers can control whether the photovoltaic power generation panel directly supplies power to the photovoltaic inverter.

[0034] Specifically, the present invention adds a storage battery, connects it in parallel with the photovoltaic panel, and, through control of first and second DC circuit breakers, achieves bidirectional selection of the photovoltaic power source for the photovoltaic inverter. This allows the storage battery to be used for power in the event of an impending overtemperature or overvoltage condition. Of particular note, the present invention proposes a novel heat dissipation control system for photovoltaic inverters. This integrates photovoltaic panel power generation information in addition to traditional control methods based on inverter power and temperature data, specifically addressing sudden increases and decreases in photovoltaic power generation.

[0035] It is worth noting that, as one of the outstanding essential features of the present invention, the present invention does not require the configuration of an expensive energy management system. The power generation power of the photovoltaic panels directly depends on major factors such as the irradiation intensity and the ambient temperature. The cooler can adjust to normal photovoltaic power fluctuations, but for extreme power changes, the reaction speed will still be insufficient. Therefore, the present invention solves the problem of sudden increase and decrease in photovoltaic power by designing energy storage batteries and connection topology relationships. Specifically, the cooler control is optimized according to the temperature and inverter power information. The speed of frequency increase (increasing power, increasing compressor speed) of a single cooler has an upper limit, but if it enters a sudden change working condition, it is still too late to adjust, and there is no temperature rise of the power module. The beneficial effect of adding an energy storage battery is that while buffering the cooler, it will not cause the unit module to overheat and power off.

[0036] like Figure 2 、 3 Embodiment 2 of the present invention provides a method for controlling heat dissipation of an inverter based on peak-valley balance of a photovoltaic power supply, comprising the following steps:

[0037] Step 1: Detect the power of the photovoltaic panel and calculate the rate of change K within the set time. If the value of the rate of change K is outside the normal operating range, enter the normal power generation condition and execute step 2; otherwise, enter the power generation sudden change condition and jump to step 3.

[0038] It is understood that sudden changes in photovoltaic panel power generation include both sudden increases and decreases in power generation. During sudden increases in power generation, the rate of change K is greater than a positive set value, such as, but not limited to, Y%. During sudden decreases in power generation, the rate of change K is less than a negative set value, such as, but not limited to, Z%. In other words, if the rate of change K is between Z% and Y%, it is considered a normal fluctuation. At this time, the cooling capacity of the chiller can be adjusted in time according to the power change, and the temperature of the power components of the photovoltaic inverter will not exceed the normal operating range.

[0039] Step 2: If the value of the rate of change K of the photovoltaic panel power within the set time is within the normal operating range, it is a normal operating condition, the first DC circuit breaker is closed, and the photovoltaic panel supplies power to the photovoltaic inverter.

[0040] Preferably but not limitatively, step 2 specifically includes:

[0041] Step 2.1: The photovoltaic panels are operating normally and photovoltaic power generation is relatively stable. Close the first DC circuit breaker QF1. The photovoltaic panels supply power to the photovoltaic inverter. The cooler starts cooling and supplies refrigerant to the radiator through the refrigerant circuit to dissipate heat and cool the photovoltaic inverter.

[0042] Further preferably but not restrictively, the controller collects parameters such as power and temperature of the photovoltaic inverter, and controls frequency increase or frequency decrease to adjust the cooling power of the cooler.

[0043] Step 2.2: Determine whether the energy storage battery SOC (State of Charge) is not less than a predetermined amount of power X%. If so, proceed to step 2.3. If not, proceed to step 2.4.

[0044] Step 2.3: Close the second DC circuit breaker QF2. The photovoltaic panel supplies power to the photovoltaic inverter while charging the energy storage battery until the SOC reaches the predetermined power X%, and then proceed to step 2.4.

[0045] It is worth noting that there is a certain margin between the predetermined power level of X% and the full charge of the energy storage battery. That is, on the basis of the predetermined power level of X%, the energy storage battery can continue to be charged, and the energy storage battery can also be discharged to the photovoltaic inverter, so as to cope with the sudden increase / decrease of photovoltaic power through charging and discharging.

[0046] Step 2.4: Disconnect the second DC circuit breaker QF2, and the PV panels will only supply power to the PV inverter.

[0047] Step 3: When the value of the rate of change K is outside the normal operating range, that is, when a sudden increase or decrease in photovoltaic power occurs, if the temperature of the photovoltaic inverter power device is abnormal, the first DC circuit breaker is disconnected and the energy storage battery supplies power to the photovoltaic inverter. The control logic is as follows: Figure 3 shown.

[0048] Preferably but not limiting, step 3 specifically includes:

[0049] Step 3.1: If the power generation suddenly increases, that is, the rate of change K of the power generation of the photovoltaic panel within the set time is greater than Y%, the power module of the photovoltaic inverter will heat up rapidly, and the cooling effect of the chiller will take effect slower than the heating rate, which may cause the power module to overheat. The photovoltaic generator set will shut down, and the inverter will stop supplying power to the load during the downtime, resulting in wasteful light.

[0050] To prevent the cooling effect of the cooler from failing to meet the heat dissipation effect of the inverter, causing the inverter power module to overheat, a simple judgment is made on the current temperature of the photovoltaic inverter. If it does not exceed the temperature upper limit T1, it indicates that the current frequency-upgrading cooling effect of the cooler can still meet the safe operation requirements of the inverter, and the switch states of the first DC circuit breaker QF1 and the second DC circuit breaker QF2 remain unchanged.

[0051] If the temperature exceeds the upper limit T1, indicating that the current frequency-increasing cooling effect of the chiller can no longer meet the safe operation requirements of the inverter, the first DC circuit breaker QF1 is opened and the second DC circuit breaker QF2 is closed. The power generation target of the photovoltaic power generation panel is switched from powering the photovoltaic inverter to charging the energy storage, and the energy storage battery discharges to the photovoltaic inverter at the set power.

[0052] Further preferably, but not limitingly, if the temperature limit T1 is exceeded, another optimized logic control method can be adopted. When a sudden surge in photovoltaic power occurs, the first DC breaker QF1 is maintained closed while the second DC breaker QF2 is closed. The photovoltaic power generation diverts a portion of its power to charge the energy storage. In other words, the power of the photovoltaic inverter is reduced. If the cooling effect of the chiller can meet the heat dissipation requirements of the photovoltaic inverter, that is, the temperature of the photovoltaic inverter drops below T1, the second DC breaker QF2 is maintained closed until the sudden surge condition is exited. At this point, the second DC breaker QF2 is opened, and the photovoltaic power supply to the inverter is fully normal. If the temperature of the photovoltaic inverter exceeds the upper temperature limit T1 while the first DC breaker QF1 is maintained closed and the second DC breaker QF2 is closed, the first DC breaker QF1 is opened and the second DC breaker QF2 is maintained closed. The photovoltaic panel's power generation target is switched from powering the photovoltaic inverter to charging the energy storage, and the energy storage battery discharges the set power into the photovoltaic inverter.

[0053] It is worth noting that the discharge power of the energy storage battery is set not to exceed the maximum cooling capacity of the chiller, that is, to ensure that the change in the operating frequency of the chiller can meet the heat dissipation requirements during the period of sudden increase in power generation.

[0054] It is understandable that in engineering practice, entering the power generation surge condition is a temporary state. During the execution of step 3, the photovoltaic panel power detection in step 1 is still continued to judge the working condition of the photovoltaic generator set. If the photovoltaic generator set has left the power generation surge condition, step 3 is entered to switch to normal working condition control.

[0055] Step 3.1: If the power generation suddenly drops, that is, the rate of change K of the photovoltaic panel's power generation power within the set time is less than Z%, and the cooler frequency is reduced to follow the cooling demand, the power module may have lost temperature due to the delayed cooling effect, and the temperature may fall below the preferred operating range.

[0056] In order to prevent the cooling effect of the cooling machine's frequency reduction adjustment from lagging behind the cooling speed of the power module, a simple judgment is made on the current temperature of the photovoltaic inverter. If it has not dropped below the lower temperature limit T2, it indicates that the current frequency reduction cooling effect of the cooling machine can still meet the safe and stable operation requirements of the inverter, and the switch states of the first DC circuit breaker QF1 and the second DC circuit breaker QF2 are maintained unchanged.

[0057] If the temperature drops below the lower limit T2, indicating that the current frequency reduction cooling effect of the chiller can no longer track and meet the normal operation requirements of the inverter, the first DC circuit breaker QF1 is disconnected and the second DC circuit breaker QF2 is closed. The power generation target of the photovoltaic panel is switched from powering the photovoltaic inverter to charging the energy storage, and the energy storage battery discharges to the photovoltaic inverter at the set power.

[0058] It is worth noting that the discharge power of the energy storage battery is set not to exceed the maximum cooling capacity of the chiller, and to maintain power supply to the load, that is, to ensure that the change in the operating frequency of the chiller matches the heat dissipation requirements during the period of sudden power generation.

[0059] It is understandable that in engineering practice, entering the power generation condition is a temporary state. During the execution of step 3, the photovoltaic panel power detection in step 1 is still continued to judge the working condition of the photovoltaic generator set. If the photovoltaic generator set has left the power generation sudden reduction condition, it enters step 3 and switches to the control of the normal working condition.

[0060] Further preferably but not restrictively, when photovoltaic power generation is insufficient at night, energy storage batteries are appropriately used to power the load via a photovoltaic inverter.

[0061] It can be understood that the priority of step 3 is higher than the priority of step 2, which is used to ensure the safe and stable operation of the photovoltaic power generation group. If under normal operating conditions, the photovoltaic power generation power suddenly changes, the control logic of the normal operating condition is immediately switched to the control logic of the photovoltaic power generation power sudden change condition. For example, but not limited to, under normal operating conditions, the energy storage battery is being charged. If there is a sudden drop in photovoltaic power and the temperature of the power device of the photovoltaic inverter drops below T2, the energy storage battery will immediately switch to supplying power to the photovoltaic inverter to buffer the cooling machine from tracking the heat dissipation requirements of the photovoltaic inverter.

[0062] Embodiment 3 of the present invention provides an electronic device, including a memory, a processor, and a computer program stored in the memory and executable on the processor. When the computer program is loaded into the processor, the method for controlling heat dissipation of an inverter based on peak-valley balance of a photovoltaic power source according to embodiment 2 is implemented.

[0063] Embodiment 4 of the present invention provides a computer-readable storage medium, which stores a computer program. When the computer program is executed by a processor, it implements the inverter heat dissipation control method based on photovoltaic power peak-valley balance according to embodiment 2.

[0064] A key feature of this invention is that the energy storage device alleviates the high internal heat dissipation pressure and delays in the photovoltaic inverter caused by sudden increases and decreases in photovoltaic panel power generation. Furthermore, the energy storage device's usage is incorporated into the control scheme of the photovoltaic inverter's heat dissipation system, optimizing the control method for the cooler. This improves the stability of the photovoltaic inverter's heat dissipation and enhances the inverter's photovoltaic power conversion efficiency. Furthermore, this invention is low-cost and does not rely on expensive energy storage battery management systems to implement the solution.

[0065] It is worth noting that in the embodiments of the present invention, "steps + numbers" are only a way of expressing a specific implementation method of the inverter heat dissipation control method based on peak-valley balance of photovoltaic power sources, rather than an absolute restriction on the sequence of each step. Under the guidance of the core concept of the present invention, changing the order of implementing these steps to obtain the same or similar technical effects falls within the scope of the present invention.

[0066] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the above embodiments, ordinary technicians in the field should understand that the specific implementation methods of the present invention can still be modified or replaced by equivalents. Any modification or equivalent replacement that does not depart from the spirit and scope of the present invention should be covered by the scope of protection of the claims of the present invention.

Claims

1. A frequency converter heat dissipation control system, characterized in that: include: First and second DC circuit breakers, controllers, radiators, coolers and energy storage batteries; The photovoltaic power generation panel is connected to the photovoltaic inverter via the first DC circuit breaker. The photovoltaic panels are connected to the energy storage battery via the second DC circuit breaker. The energy storage battery is connected to the photovoltaic inverter; The controller is connected to the first and second DC circuit breakers to control the closing and opening of the first and second DC circuit breakers, and switches the power supply connected to the photovoltaic inverter when the photovoltaic panel enters different working conditions; The cooler is connected to the radiator through a refrigerant circuit and is used to cool and dissipate heat for the photovoltaic inverter.

2. The inverter heat dissipation control system according to claim 1, characterized in that: The energy storage battery is a battery or a capacitor, and its rated discharge power does not exceed the maximum refrigeration capacity of the chiller.

3. A frequency converter heat dissipation control method, based on a frequency converter heat dissipation control system according to claim 1 or 2, characterized in that: The following steps are involved: If the value of the rate of change K of the photovoltaic panel power within the set time is within the normal operating range, it is a normal operating condition, the first DC circuit breaker is closed, and the photovoltaic panel supplies power to the photovoltaic inverter; If the value of the change rate K is outside the normal operating range, it is a photovoltaic power generation sudden change operating condition. Under the photovoltaic power generation sudden change operating condition, if the temperature of the photovoltaic inverter power device is abnormal, the first DC circuit breaker is disconnected and power is supplied to the photovoltaic inverter by the energy storage battery.

4. The inverter heat dissipation control method according to claim 3, characterized in that: Under normal operating conditions, if the SOC of the energy storage battery is lower than the set value, the second DC circuit breaker is closed until the SOC of the energy storage battery reaches the set value, and then the second DC circuit breaker is opened.

5. The inverter heat dissipation control method according to claim 4, characterized in that: There is a margin between the set value and the maximum and minimum SOC values ​​of the energy storage battery. When the SOC of the energy storage battery is the set value, it can continue to charge to store the power of the photovoltaic panel, or it can continue to discharge to supply power to the photovoltaic inverter.

6. A method for controlling heat dissipation of a frequency converter according to any one of claims 3 to 5, characterized in that: If the value of the change rate K is greater than the upper limit of the normal operating range, the photovoltaic power generation power surge condition is entered. If the temperature of the photovoltaic inverter power device exceeds the limit, the first DC circuit breaker is disconnected and the second DC circuit breaker is closed or disconnected. The energy storage battery supplies power to the photovoltaic inverter at a discharge power that does not exceed the maximum cooling power of the chiller.

7. A method for controlling heat dissipation of a frequency converter according to any one of claims 3 to 5, characterized in that: If the value of the change rate K is greater than the upper limit of the normal operating range, the photovoltaic power generation power suddenly increases, the second DC circuit breaker is closed, and the energy storage battery shares the power generation power of the photovoltaic panel. If the temperature of the power device of the photovoltaic inverter does not exceed the limit, the second DC circuit breaker is kept closed during the photovoltaic power generation power sudden change condition.

8. A method for controlling heat dissipation of a frequency converter according to any one of claims 3 to 5, characterized in that: If the value of the change rate K is less than the lower limit of the normal operating range, the photovoltaic power generation power suddenly decreases. If the temperature of the photovoltaic inverter power device exceeds the limit, the first DC circuit breaker is disconnected, and the energy storage battery supplies power to the photovoltaic inverter at a discharge power that does not exceed the maximum cooling power of the chiller.

9. An electronic device comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein: When the computer program is loaded into a processor, a method for controlling heat dissipation of a frequency converter according to any one of claims 3 to 8 is implemented.

10. A computer-readable storage medium storing a computer program, wherein the computer program, when executed by a processor, implements the inverter heat dissipation control method according to any one of claims 3 to 8.

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