Control method, control apparatus, control system, and readable storage medium

Abstract

Disclosed are a control method, a control apparatus (10), a control system (100), and a readable storage medium. The control method of embodiments of the present application is used for controlling a fan of an electric energy conversion circuit board, and the control method comprises: determining a core cooling rotation speed on the basis of a core temperature of the electric energy conversion circuit board; on the basis of a heat radiation temperature of the electric energy conversion circuit board and a charge-discharge power of an energy storage system using the electric energy conversion circuit board, determining a plurality of power cooling rotation speeds; and controlling the fan to rotate at a larger one among the core cooling rotation speed and the plurality of power cooling rotation speeds.

Description

Control method, control device, control system, and readable storage medium

[0001] Priority information

[0002] This application claims priority to and the benefit of the filing date of Chinese Patent Application No. 202410868804.7, filed on June 28, 2024, and is hereby incorporated by reference in its entirety. TECHNICAL FIELD

[0003] The present application relates to the technical field of inverters, and more particularly, to a control method, a control device, a control system, and a readable storage medium. BACKGROUND

[0004] With the development of new energy technology, on the one hand, the input power of the inverter is getting larger and larger, and the heat dissipation demand is getting higher and higher, so the number of installed heat dissipation fans is getting larger and larger. On the other hand, the function of the inverter is also getting more and more complex, and the working mode is getting more and more, and the heat dissipation demand under different working modes is not the same. However, in the related art, in order to avoid poor heat dissipation effect, the heat dissipation fan works at a fixed maximum speed in different modes of the inverter, resulting in large energy consumption and large noise. SUMMARY

[0005] The present application provides a control method, a control device, a control system, and a readable storage medium.

[0006] The control method of the present application embodiment is used for controlling a fan of an electric energy conversion circuit board, and the control method comprises:

[0007] determining a core cooling speed according to a core temperature of the electric energy conversion circuit board;

[0008] determining a plurality of power cooling speeds according to a heat radiation temperature of the electric energy conversion circuit board and a charge-discharge power of an energy storage system using the electric energy conversion circuit board;

[0009] controlling the fan to rotate at a larger value of the core cooling speed and the plurality of power cooling speeds.

[0010] The control method provided by the present application embodiment confirms the speed of the fan through the core temperature, the charge-discharge power, and the heat radiation temperature, which not only guarantees the heat dissipation effect, but also adjusts the speed of the fan according to the heat dissipation demand, effectively reduces the energy consumption caused by the fan, and is conducive to reducing the use cost. At the same time, when the heat dissipation demand is small, the fan will slow down, which is conducive to reducing the noise generated by the high-speed rotation of the fan.

[0011] In some embodiments, the core temperature is the maximum temperature of core components of the electric energy conversion circuit board, the core components including an inverter circuit, a boost-buck circuit and / or an MPPT circuit.

[0012] In this way, the heat sinks of the inverter circuit, the boost-buck circuit and the MPPT circuit are core components with high temperature during the operation of the electric energy conversion circuit board, and thus the cooling requirements of most of the electric components in the electric energy conversion circuit board can be effectively ensured.

[0013] In some embodiments, the core cooling rotation speed is determined according to the core temperature of the electric energy conversion circuit board, including:

[0014] When the core temperature is less than the start-up temperature, the core cooling rotation speed is determined as 0;

[0015] When the core temperature is greater than or equal to the start-up temperature and less than the overheat temperature, the core cooling rotation speed is gradually increased from a preset rotation speed of the fan to a maximum rotation speed of the fan as the core temperature increases;

[0016] When the core temperature is greater than or equal to the overheat temperature, the core cooling rotation speed is determined as the maximum rotation speed of the fan.

[0017] In this way, the rotation speed of the fan is determined according to the core temperature, which is beneficial to energy saving and noise reduction. In addition, when the core temperature is lower than the start-up temperature, the electric energy conversion circuit board can rely on its own heat dissipation, and thus the fan does not need to be turned on, which is beneficial to energy saving and noise reduction. When the core temperature is greater than or equal to the overheat temperature, the electric energy conversion circuit board is overheated, and the fan needs to be rotated at the highest speed to dissipate heat as soon as possible, so as to avoid burning of the electric energy conversion circuit board.

[0018] In some embodiments, the increase rate of the core cooling rotation speed gradually increases as the core temperature increases.

[0019] In this way, as the core temperature increases, the heat dissipation effect of the fan becomes worse and worse, and thus the increase rate of the core cooling rotation speed needs to be increased.

[0020] In some embodiments, the multiple power cooling rotation speeds are determined according to the heat radiation temperature and the charge-discharge power of the energy storage system to which the electric energy conversion circuit board is applied, including:

[0021] determining a rotation speed upper limit coefficient according to the heat radiation temperature;

[0022] determining the multiple power cooling rotation speeds according to the rotation speed upper limit coefficient and the charge-discharge power.

[0023] In this way, the power cooling rotation speeds are determined by using the rotation speed upper limit coefficient and the charge-discharge power, which is beneficial to making the power cooling rotation speeds more accurate.

[0024] In some embodiments, the determining the rotation speed upper limit coefficient according to the thermal radiation temperature comprises:

[0025] When the thermal radiation temperature is less than a first preset temperature, the rotation speed upper limit coefficient is determined as a first preset value;

[0026] When the thermal radiation temperature is greater than or equal to the first preset temperature and less than a second preset temperature, the rotation speed upper limit coefficient is gradually increased from the first preset value to 1 as the thermal radiation temperature increases;

[0027] When the thermal radiation temperature is greater than or equal to the second preset temperature, the rotation speed upper limit coefficient is determined as 1.

[0028] In this way, the rotation speed of the fan is determined according to the thermal radiation temperature, which is beneficial to energy saving and noise reduction. In addition, when the thermal radiation temperature is lower than the start-up temperature, the heat dissipation of the electric energy conversion circuit board itself can meet the demand, so the fan does not need to be turned on, which is beneficial to energy saving and noise reduction.

[0029] In some embodiments, the first preset temperature is the thermal radiation temperature when the rotation speed of the fan is a preset rotation speed and the power of the electric energy conversion circuit board reaches a rated power, and / or

[0030] The second preset temperature is the thermal radiation temperature when the rotation speed of the fan is a maximum rotation speed and the power of the electric energy conversion circuit board reaches the rated power.

[0031] In this way, the rotation speed of the fan is further accurately controlled.

[0032] In some embodiments, the increase rate of the rotation speed upper limit coefficient gradually increases as the thermal radiation temperature increases.

[0033] In this way, as the thermal radiation temperature increases, the heat dissipation effect of the fan becomes worse and worse, so the increase rate of the core cooling rotation speed needs to be increased.

[0034] In some embodiments, the determining the plurality of power cooling rotation speeds according to the rotation speed upper limit coefficient and the charging and discharging power comprises:

[0035] The output current and the output rated current of the electric energy conversion circuit board are obtained;

[0036] A first power cooling rotation speed is calculated according to the output current, the output rated current and the rotation speed upper limit coefficient.

[0037] In this way, the first power cooling rotation speed required by the heat dissipation demand of the output current of the electric energy conversion circuit board can be determined.

[0038] In some embodiments, the determining the multiple power cooling speeds according to the upper limit coefficient of the rotating speed and the charging and discharging power comprises:

[0039] obtaining a mains charging current and a mains charging maximum current of the energy storage device;

[0040] calculating a second power cooling speed according to the mains charging current, the mains charging maximum current and the upper limit coefficient of the rotating speed.

[0041] In this way, the second power cooling speed required by the heat dissipation demand of the mains charging current can be determined.

[0042] In some embodiments, the determining the multiple power cooling speeds according to the upper limit coefficient of the rotating speed and the charging and discharging power comprises:

[0043] obtaining a mains input current and a maximum input current limit value of the power conversion circuit board;

[0044] calculating a third power cooling speed according to the mains input current, the maximum input current limit value and the upper limit coefficient of the rotating speed.

[0045] In this way, the third power cooling speed required by the heat dissipation demand of the mains input current can be determined.

[0046] In some embodiments, the determining the multiple power cooling speeds according to the upper limit coefficient of the rotating speed and the charging and discharging power comprises:

[0047] obtaining a PV charging current and a PV charging maximum current of the power conversion circuit board;

[0048] calculating a fourth power cooling speed according to the PV charging current, the PV charging maximum current and the upper limit coefficient of the rotating speed.

[0049] In this way, the fourth power cooling speed required by the heat dissipation demand of the PV charging current can be determined.

[0050] In some embodiments, the controlling the fan to rotate at the greater value of the core cooling speed and the multiple power cooling speeds comprises:

[0051] in the case of charging the energy storage system, controlling the fan to rotate at the greater value of the core cooling speed, the first power cooling speed and the fourth power cooling speed;

[0052] in the case of discharging the energy storage system, controlling the fan to rotate at the greater value of the core cooling speed, the second power cooling speed, the third power cooling speed and the fourth power cooling speed.

[0053] Thus, the working state is divided into two cases of charging and discharging, which is beneficial to more quickly and accurately determine the rotating speed of the fan.

[0054] The control device of the second embodiment of the present application is used for controlling a fan of an electric energy conversion circuit board, and comprises:

[0055] The first calculation module is used for determining a core cooling rotating speed according to a core temperature of the electric energy conversion circuit board.

[0056] The second calculation module is used for determining a plurality of power cooling rotating speeds according to a heat radiation temperature of the electric energy conversion circuit board and a charging and discharging power of an energy storage system applied to the electric energy conversion circuit board.

[0057] The control module is used for controlling the fan to rotate at a larger value of the core cooling rotating speed and the plurality of power cooling rotating speeds.

[0058] The control system of the third embodiment of the present application comprises a processor and a memory, and the memory stores a computer program.

[0059] The non-volatile computer readable storage medium of the fourth embodiment of the present application stores a computer program.

[0060] Additional aspects and advantages of embodiments of the present application will be in part apparent and in part pointed out hereinafter. BRIEF DESCRIPTION OF DRAWINGS

[0061] The above and / or additional aspects and advantages of the present application will become apparent and be readily appreciated from the following description, including the drawings.

[0062] Fig. 1 is a flowchart of a control method of a control system according to an embodiment of the present application;

[0063] Fig. 2 is a schematic diagram of a control device of a control system according to an embodiment of the present application;

[0064] Fig. 3 is a schematic diagram of a control system according to an embodiment of the present application;

[0065] Fig. 4 is a flowchart of a control method of a control system according to some embodiments of the present application;

[0066] Fig. 5 is a flowchart of a control method of a control system according to some embodiments of the present application;

[0067] Fig. 6 is a flowchart of a control method of a control system according to some embodiments of the present application;

[0068] Fig. 7 is a flowchart of a control method of a control system according to some embodiments of the present application;

[0069] Fig. 8 is a flowchart of a control method of a control system according to some embodiments of the present application;

[0070] Fig. 9 is a flowchart of a control method of a control system according to some embodiments of the present application;

[0071] Fig. 10 is a flowchart of a control method of a control system according to some embodiments of the present application;

[0072] Fig. 11 is a flowchart of a control method of a control system according to some embodiments of the present application.

[0073] Main element symbol explanation: control system 100, control device 10, first calculation module 11, second calculation module 12, control module 13, processor 20, memory 30. DETAILED DESCRIPTION

[0074] The embodiments of the present application will be further described below with reference to the drawings. The same or similar reference numerals are used throughout the drawings to represent the same or similar elements or elements having the same or similar functions.

[0075] In addition, the embodiments of the present application described below in conjunction with the drawings are exemplary and are only used to explain the embodiments of the present application, and cannot be understood as a limitation of the present application.

[0076] In the present application, unless explicitly specified and limited, the first feature is "on" or "under" the second feature, which can be direct contact between the first and second features, or indirect contact between the first and second features through an intermediate medium. Moreover, the first feature "above", "over" and "on" the second feature can be directly above or obliquely above the first feature, or only indicates that the horizontal height of the first feature is higher than that of the second feature. The first feature "below", "under" and "under" the second feature can be directly below or obliquely below the first feature, or only indicates that the horizontal height of the first feature is less than that of the second feature.

[0077] With the development of new energy technology, on the one hand, the input power of the inverter is getting larger and larger, and the heat dissipation demand is getting higher and higher, so the number of installed heat dissipation fans is getting larger and larger. On the other hand, the function of the inverter is also getting more and more complex, and the working mode is getting more and more, and the heat dissipation demand under different working modes is not the same. However, in the related technology, in order to avoid poor heat dissipation effect, the heat dissipation fan works at a fixed maximum speed in different modes of the inverter, resulting in large energy consumption and large noise.

[0078] Referring to FIG. 1, the control method of the embodiment of the application is used to control the fan of the electric energy conversion circuit board, and the control method comprises:

[0079] Step 01: determining a core cooling speed according to the core temperature of the electric energy conversion circuit board;

[0080] Step 02: determining a plurality of power cooling speeds according to the heat radiation temperature of the electric energy conversion circuit board and the charge and discharge power of the energy storage system applied to the electric energy conversion circuit board;

[0081] Step 03: controlling the fan to rotate at the greater value of the core cooling speed and the plurality of power cooling speeds.

[0082] Referring to FIG. 2, the embodiment of the application further provides a control device 10 used to control the fan of the electric energy conversion circuit board, comprising a first calculation module 11, a second calculation module 12 and a control module 13, the first calculation module 11 is used to determine a core cooling speed according to the core temperature of the electric energy conversion circuit board, the second calculation module 12 is used to determine a plurality of power cooling speeds according to the heat radiation temperature of the electric energy conversion circuit board and the charge and discharge power of the energy storage system applied to the electric energy conversion circuit board, and the control module 13 is used to control the fan to rotate at the greater value of the core cooling speed and the plurality of power cooling speeds.

[0083] Referring to FIG. 3, the embodiment of the application further provides a control system 100 comprising a processor 20 and a memory 30, and the memory 30 stores a computer program, when the computer program is executed by the processor 20, the instructions of the control method of any one of the above are realized by the processor 20. Alternatively, the processor 20 can be used to determine a core cooling speed according to the core temperature of the electric energy conversion circuit board, then determine a plurality of power cooling speeds according to the heat radiation temperature of the electric energy conversion circuit board and the charge and discharge power of the energy storage system applied to the electric energy conversion circuit board, and finally control the fan to rotate at the greater value of the core cooling speed and the plurality of power cooling speeds.

[0084] The control method provided by the embodiments of the present application confirms the rotating speed of the fan through the core temperature, the charging and discharging power and the thermal radiation temperature, guarantees the heat dissipation effect, and adjusts the rotating speed of the fan according to the heat dissipation demand, effectively reduces the energy consumption caused by the fan, and is beneficial to reducing the use cost. Meanwhile, the fan reduces the rotating speed when the heat dissipation demand is small, which is beneficial to reducing the noise caused by the high-speed rotation of the fan.

[0085] Specifically, the electric energy conversion circuit board includes an inverter circuit board (DC-AC) and an MPPT circuit board (DC-DC).

[0086] The core cooling rotating speed refers to the rotating speed of the fan for meeting the heat dissipation demand of the core components of the electric energy conversion circuit board.

[0087] The thermal radiation temperature refers to the temperature of the periphery of the electric energy conversion circuit board due to the heat dissipation of the electric energy conversion circuit board.

[0088] The charging and discharging power refers to the input and output power of the electric energy conversion circuit board and the energy storage system. Since the voltage remains unchanged during the input and output process, the charging and discharging power is usually replaced by the current during the input and output.

[0089] The power cooling rotating speed refers to the rotating speed of the fan for meeting the heat dissipation demand of the heat generated by the electric energy conversion circuit board under the current charging and discharging power.

[0090] In the embodiments of the present application, the fan needs to be controlled to rotate at the maximum value of the core cooling rotating speed and the plurality of power cooling rotating speeds to guarantee to meet all the cooling demands of the electric energy conversion circuit board.

[0091] Since the size of the duty cycle determines the speed of the fan, specifically, when the duty cycle is 100%, the fan continuously works and the rotating speed reaches the highest; when the duty cycle is 0%, the fan stops working and the rotating speed is zero. Therefore, in the embodiments of the present application, the duty cycle is used to replace the description of the core cooling rotating speed and the plurality of power cooling rotating speeds, or in other words, the duty cycle is used to represent the core cooling rotating speed and the plurality of power cooling rotating speeds.

[0092] In some embodiments, the core temperature is the maximum temperature of the core components of the electric energy conversion circuit board, and the core components include the inverter circuit, the boost-buck circuit and / or the MPPT circuit.

[0093] In this way, the inverter circuit, the boost-buck circuit and the MPPT circuit are the core components with high temperature during the operation of the electric energy conversion circuit board, and taking them as the reference can effectively ensure the cooling demand of most of the electrical components in the electric energy conversion circuit board.

[0094] Further, the inverter circuit, the boost-buck circuit, and the MPPT circuit all have MOS transistors, which are the components that generate the most heat in the inverter circuit, the boost-buck circuit, and the MPPT circuit. Therefore, the maximum temperature of the heat sinks of the inverter circuit, the boost-buck circuit, and the MPPT circuit can be taken as the core temperature.

[0095] Specifically, the inverter circuit refers to a common power electronic converter, which is the core component of the power conversion circuit board. It is mainly used to convert DC power into AC power. The inverter circuit is composed of four switching tubes (such as IGBT, MOSFET, etc.). By controlling the conduction and disconnection of these switching tubes, the voltage of the battery, power supply, etc. can be converted into high-frequency high-voltage AC power for use in AC motors, frequency converters, and other devices.

[0096] The boost-buck circuit refers to an electronic circuit that can realize the functions of boosting and bucking. It is a more flexible circuit type. The boost-buck circuit is similar to the combination of a boost circuit and a buck circuit, and is usually composed of a switching tube, an inductor, and an output capacitor. The boost-buck circuit can be applied to various scenarios, such as power adapters, automobile ignition systems, electric vehicle chargers, solar photovoltaic power generation systems, etc.

[0097] The MPPT circuit, i.e. Maximum Power Point Tracking circuit, is a key technology circuit in solar photovoltaic power generation systems. The MPPT circuit is a circuit that can monitor and adjust the operating point of a solar panel in real time, so that it always works at the maximum power point (MPP). It adjusts the output voltage and current of the solar panel to maximize the extraction of solar energy, thereby improving the efficiency of the entire solar photovoltaic power generation system.

[0098] During the operation of the power conversion circuit board, power loss will occur, and most of the lost energy will be released in the form of heat. As the key components of the power conversion circuit board, the inverter circuit, the boost-buck circuit, and the MPPT circuit bear the main task of power conversion, so their power loss is relatively high, and the generated heat is also relatively large. Moreover, due to the working characteristics and material properties of the inverter circuit, the boost-buck circuit, and the MPPT circuit, these components are usually sensitive to temperature. In a high-temperature environment, the failure rate of these components will increase, and their performance and lifespan will be affected.

[0099] In the embodiments of the present application, the core components include but are not limited to the inverter circuit, the boost-buck circuit, and / or the MPPT circuit.

[0100] Please refer to FIG. 4. In some embodiments, step 01 includes:

[0101] 011: determining the core cooling rotation speed as 0 when the core temperature is less than the start-up temperature;

[0102] 012: determining the core cooling rotation speed gradually increasing from the preset rotation speed of the fan to the maximum rotation speed of the fan as the core temperature increases when the core temperature is greater than or equal to the start-up temperature and less than the overheat temperature;

[0103] 013: determining the core cooling rotation speed as the maximum rotation speed of the fan when the core temperature is greater than or equal to the overheat temperature.

[0104] In this way, determining the rotation speed of the fan according to the core temperature is conducive to energy saving and noise reduction. In addition, when the core temperature is lower than the start-up temperature, the power conversion circuit board can rely on its own heat dissipation, and at this time, the fan does not need to be turned on, which is conducive to energy saving and noise reduction; when the core temperature is greater than or equal to the overheat temperature, the power conversion circuit board is overheated at this time, and the fan needs to be rotated at the highest speed to dissipate heat as soon as possible to avoid burning the power conversion circuit board.

[0105] In some embodiments, sub-steps 011, 012 and 013 are implemented by the first calculation module 11, or in other words, the first calculation module 11 can be used to determine the core cooling rotation speed as 0 when the core temperature is less than the start-up temperature; determine the core cooling rotation speed gradually increasing from the preset rotation speed of the fan to the maximum rotation speed of the fan as the core temperature increases when the core temperature is greater than or equal to the start-up temperature and less than the overheat temperature; and determine the core cooling rotation speed as the maximum rotation speed of the fan when the core temperature is greater than or equal to the overheat temperature.

[0106] In some embodiments, the processor 20 can be used to determine the core cooling rotation speed as 0 when the core temperature is less than the start-up temperature; determine the core cooling rotation speed gradually increasing from the preset rotation speed of the fan to the maximum rotation speed of the fan as the core temperature increases when the core temperature is greater than or equal to the start-up temperature and less than the overheat temperature; and determine the core cooling rotation speed as the maximum rotation speed of the fan when the core temperature is greater than or equal to the overheat temperature.

[0107] Specifically, the start-up temperature refers to the core temperature at which the power conversion circuit board cannot meet the heat dissipation requirement through its own heat dissipation and needs to start the fan to assist in heat dissipation.

[0108] The preset rotation speed refers to the minimum rotation speed at which the fan assists the power conversion circuit board in heat dissipation to meet the heat dissipation requirement of the power conversion circuit board when the core temperature reaches the start-up temperature.

[0109] The maximum rotation speed refers to the maximum rotation speed value that the fan can reach under certain conditions. Specifically, the maximum rotation speed of the fan may vary due to device design, working conditions or manufacturing requirements.

[0110] The overheat temperature refers to that the internal temperature of the power conversion circuit board exceeds the upper limit temperature of the normal working range due to the heat generated by power loss or other reasons in the working process of the power conversion circuit board. This temperature limit is set to ensure the performance and reliability of the power conversion circuit board. Once the temperature limit is exceeded, the power conversion circuit board may automatically shut down or cause irreparable damage. Therefore, to ensure that the power conversion circuit board can dissipate heat as soon as possible and reduce the probability of damage, the core cooling rotation speed should be kept at the maximum rotation speed value.

[0111] In the embodiment of the present application, when the core temperature is greater than or equal to the start-up temperature and less than the overheat temperature, since the power conversion circuit board adopts forced convection, it can be concluded that the heat dissipated per unit time is: Q=H×S×Δt;

[0112] Wherein, Q is the heat to be dissipated, H is the forced convection heat transfer coefficient, S is the heat dissipation area, and Δt is the unit time.

[0113] The relationship between Nusselt number and Reynolds number and Prandtl number is expressed by the Dittus-Boelter formula: Nu=C×Re m ×Pr n ;

[0114] Wherein, Nu is the Nusselt number, Re is the Reynolds number, Pr is the Prandtl number, and C, m and n are constants and 0

[0115] Since Re=VL / ν, H=k / L×Nu, substituting the above formula can derive: H=V m (kCL m-1 ν -m Pr n )

[0116] Wherein, k is the thermal conductivity of the fluid, L is the characteristic length, and ν is the dynamic viscosity.

[0117] Since the parameters in the parentheses, k, L, and ν, remain unchanged under the same power conversion circuit board, the slight difference caused by the change of wind speed can be ignored, and C and Prandtl number are constants, so kCL m-1 ν -m Pr n can be regarded as a constant, and K=kCL m-1 ν -m Pr n , so H=KV m ;

[0118] Vm is a power function, and H increases with the increase of V.

[0119] Since Q = H x S x At, i.e. Q = K x S x At x V m ;

[0120] As can be seen from the above formula, under the condition that the heat dissipation area and the unit time are constant, the greater the value of Q is, the greater the value of V required is. The value of Q is determined by the core temperature, and the flow rate V flowing through the power conversion circuit board is determined by the core cooling speed of the fan, so the core cooling speed gradually increases from the preset speed of the fan to the maximum speed of the fan as the core temperature rises.

[0121] In some embodiments, the increase rate of the core cooling speed gradually increases as the core temperature rises.

[0122] In this way, as the core temperature rises, the heat dissipation effect of the fan becomes worse and worse, so the increase rate of the core cooling speed needs to be increased.

[0123] Specifically, since Q = K x S x At x V m is a power function, and 0 < m < 1, the increase rate of the core cooling speed gradually increases as the core temperature rises.

[0124] Referring to FIG. 5, in some embodiments, step 02 includes:

[0125] 021: determining a speed upper limit coefficient according to the thermal radiation temperature;

[0126] 022: determining a plurality of power cooling speeds according to the speed upper limit coefficient and the charging and discharging power.

[0127] In this way, the speed upper limit coefficient and the charging and discharging power are used to determine the power cooling speed, which is beneficial to making the power cooling speed more accurate.

[0128] In some embodiments, sub-steps 021 and 022 are implemented by the second calculation module 12, or in other words, the second calculation module 12 can be used to determine the speed upper limit coefficient according to the thermal radiation temperature and determine a plurality of power cooling speeds according to the speed upper limit coefficient and the charging and discharging power.

[0129] In some embodiments, the processor 20 can be used to determine the speed upper limit coefficient according to the thermal radiation temperature and determine a plurality of power cooling speeds according to the speed upper limit coefficient and the charging and discharging power.

[0130] Specifically, the speed upper limit coefficient refers to a speed coefficient of load speed regulation according to the thermal radiation temperature.

[0131] Referring to FIG. 6, in some embodiments, sub-step 021 includes:

[0132] 0211: determining the rotation speed upper limit coefficient as a first preset value when the heat radiation temperature is less than a first preset temperature;

[0133] 0212: determining the rotation speed upper limit coefficient gradually increasing from the first preset value to 1 with the increase of the heat radiation temperature when the heat radiation temperature is greater than or equal to the first preset temperature and less than a second preset temperature;

[0134] 0213: determining the rotation speed upper limit coefficient as 1 when the heat radiation temperature is greater than or equal to the second preset temperature.

[0135] In this way, determining the rotation speed of the fan according to the heat radiation temperature is conducive to energy saving and noise reduction. In addition, when the heat radiation temperature is lower than the start-up temperature, the heat dissipation of the electric energy conversion circuit board itself can meet the demand, and the fan does not need to be turned on at this time, which is conducive to energy saving and noise reduction.

[0136] In some embodiments, the sub-steps 0211, 0212 and 0213 are implemented by the second calculation module 12, or in other words, the second calculation module 12 can be used to determine the rotation speed upper limit coefficient as a first preset value when the heat radiation temperature is less than a first preset temperature, determine the rotation speed upper limit coefficient gradually increasing from the first preset value to 1 with the increase of the heat radiation temperature when the heat radiation temperature is greater than or equal to the first preset temperature and less than a second preset temperature, and determine the rotation speed upper limit coefficient as 1 when the heat radiation temperature is greater than or equal to the second preset temperature.

[0137] In some embodiments, the processor 20 can be used to determine the rotation speed upper limit coefficient as a first preset value when the heat radiation temperature is less than a first preset temperature, determine the rotation speed upper limit coefficient gradually increasing from the first preset value to 1 with the increase of the heat radiation temperature when the heat radiation temperature is greater than or equal to the first preset temperature and less than a second preset temperature, and determine the rotation speed upper limit coefficient as 1 when the heat radiation temperature is greater than or equal to the second preset temperature.

[0138] Specifically, in the present embodiment, the rotation speed upper limit coefficient G n is the ratio of the rotation speed N n that theoretically meets the heat dissipation requirement of the electric energy conversion circuit board to the maximum rotation speed N max , i.e. G n =N n / N max .

[0139] wherein the first preset value is the ratio of the rotation speed N1 that theoretically meets the heat dissipation requirement of the electric energy conversion circuit board when the heat radiation temperature is the first preset temperature to the maximum rotation speed N max , i.e. G1=N1 / N max .

[0140] Since the heat radiation temperature is determined by the core temperature, and the core cooling rotation speed gradually increases from the preset rotation speed of the fan to the maximum rotation speed of the fan as the core temperature rises. Therefore, the rotation speed upper limit coefficient gradually increases from the first preset value to the maximum value as the heat radiation temperature rises, i.e. G max = N max / N max = 1.

[0141] In some embodiments, the first preset temperature is the heat radiation temperature when the rotation speed of the fan is the preset rotation speed and the power of the power conversion circuit board reaches the rated power, and / or the second preset temperature is the heat radiation temperature when the rotation speed of the fan is the maximum rotation speed and the power of the power conversion circuit board reaches the rated power.

[0142] In this way, it is beneficial to further accurately control the rotation speed of the fan.

[0143] Specifically, usually the ambient temperature around the power conversion circuit board is taken as the heat radiation temperature, that is, when the core temperature is the start-up temperature, the ambient temperature around the power conversion circuit board is the first preset temperature, and when the core temperature is the overheating temperature, the ambient temperature around the power conversion circuit board is the second preset temperature.

[0144] In some embodiments, the increase rate of the rotation speed upper limit coefficient gradually increases as the heat radiation temperature rises.

[0145] In this way, as the heat radiation temperature rises, the heat dissipation effect of the fan becomes worse and worse, so the increase rate of the core cooling rotation speed needs to be increased.

[0146] Specifically, since the increase rate of the core cooling rotation speed gradually increases as the core temperature rises, the heat radiation temperature is determined by the core temperature, and G n = N n / N max Therefore, the increase rate of the rotation speed upper limit coefficient gradually increases as the heat radiation temperature rises.

[0147] Please refer to FIG. 7, in some embodiments, sub-step 022 comprises:

[0148] 0221: obtaining the output current and the output rated current of the power conversion circuit board;

[0149] 0222: calculating the first power cooling rotation speed according to the output current, the output rated current and the rotation speed upper limit coefficient.

[0150] In this way, the first power cooling rotation speed required by the heat dissipation demand of the output current of the power conversion circuit board can be determined.

[0151] In some embodiments, the sub-steps 0221 and 0222 are implemented by the second calculation module 12, or in other words, the second calculation module 12 can be used to obtain the output current and the output rated current of the electric energy conversion circuit board and calculate the first power cooling rotating speed according to the output current, the output rated current and the rotating speed upper limit coefficient.

[0152] In some embodiments, the processor 20 can be used to obtain the output current and the output rated current of the electric energy conversion circuit board and calculate the first power cooling rotating speed according to the output current, the output rated current and the rotating speed upper limit coefficient.

[0153] Specifically, in the embodiments of the present application, the first power cooling rotating speed is: only in the discharging mode, according to the proportion of the output current of the electric energy conversion circuit board to the rated current, the minimum fan rotating speed meeting the current cooling demand;

[0154] The relationship between the first power cooling rotating speed and the output current is:

[0155] The first power cooling rotating speed = (output current / output rated current) × G.

[0156] Referring to FIG. 8, in some embodiments, the sub-step 022 includes:

[0157] 0223: obtaining the mains charging current and the mains charging maximum current of the energy storage device;

[0158] 0224: calculating the second power cooling rotating speed according to the mains charging current, the mains charging maximum current and the rotating speed upper limit coefficient.

[0159] In this way, the second power cooling rotating speed required for the cooling demand of the mains charging current can be determined.

[0160] In some embodiments, the sub-steps 0223 and 0224 are implemented by the second calculation module 12, or in other words, the second calculation module 12 can be used to obtain the mains charging current and the mains charging maximum current of the energy storage device and calculate the second power cooling rotating speed according to the mains charging current, the mains charging maximum current and the rotating speed upper limit coefficient.

[0161] In some embodiments, the processor 20 can be used to obtain the mains charging current and the mains charging maximum current of the energy storage device and calculate the second power cooling rotating speed according to the mains charging current, the mains charging maximum current and the rotating speed upper limit coefficient.

[0162] Specifically, in the embodiments of the present application, since the current of the energy storage device will have a slight change during the charging process, specifically, gradually increases with the increase of the charging amount, therefore, in order to ensure the accuracy of the calculation result, the charging current at the energy storage device is selected to calculate the rotating speed of the fan.

[0163] Further, the second power cooling rotation speed is: only in the charging mode, according to the charging current at the energy storage device, the minimum fan rotation speed meeting the current heat dissipation requirement;

[0164] The relationship between the second power cooling rotation speed and the utility power charging current is:

[0165] The second power cooling rotation speed=(charging current at the energy storage device / maximum charging current at the energy storage device)×G.

[0166] Referring to FIG. 9, in some embodiments, the sub-step 022 comprises:

[0167] 0225: obtaining the utility input current and the maximum input current limit of the power conversion circuit board;

[0168] 0226: calculating the third power cooling rotation speed according to the utility input current, the maximum input current limit and the rotation speed upper limit coefficient.

[0169] In this way, the third power cooling rotation speed required by the heat dissipation requirement of the utility input current can be determined.

[0170] In some embodiments, the sub-steps 0225 and 0226 are implemented by the second calculation module 12, or in other words, the second calculation module 12 can be used to obtain the utility input current and the maximum input current limit of the power conversion circuit board and calculate the third power cooling rotation speed according to the utility input current, the maximum input current limit and the rotation speed upper limit coefficient.

[0171] In some embodiments, the processor 20 can be used to obtain the utility input current and the maximum input current limit of the power conversion circuit board and calculate the third power cooling rotation speed according to the utility input current, the maximum input current limit and the rotation speed upper limit coefficient.

[0172] Specifically, the third power cooling rotation speed is: in the case of utility input, according to the utility input current at the grid side, the minimum fan rotation speed meeting the current heat dissipation requirement;

[0173] The relationship between the third power cooling rotation speed and the utility input current is:

[0174] The third power cooling rotation speed=(utility input current / maximum input current limit)×G.

[0175] Referring to FIG. 10, in some embodiments, the sub-step 022 comprises:

[0176] 0227: obtaining the PV charging current and the maximum PV charging current of the power conversion circuit board;

[0177] 0228: calculating the fourth power cooling rotation speed according to the PV charging current, the maximum PV charging current and the rotation speed upper limit coefficient.

[0178] Thus, the fourth power cooling rotation speed required for determining the heat dissipation requirement of the PV charging current can be determined.

[0179] In some embodiments, the sub-steps 0227 and 0228 are implemented by the second calculation module 12, or in other words, the second calculation module 12 can be used to obtain the PV charging current and the PV charging maximum current of the electric energy conversion circuit board, and calculate the fourth power cooling rotation speed according to the PV charging current, the PV charging maximum current and the rotation speed upper limit coefficient.

[0180] In some embodiments, the processor 20 can be used to obtain the PV charging current and the PV charging maximum current of the electric energy conversion circuit board, and calculate the fourth power cooling rotation speed according to the PV charging current, the PV charging maximum current and the rotation speed upper limit coefficient.

[0181] Specifically, the fourth power cooling rotation speed is: when the solar charging is performed, the minimum fan rotation speed meeting the current heat dissipation requirement according to the PV charging current value;

[0182] The relationship between the fourth power cooling rotation speed and the PVT charging current is:

[0183] The fourth power cooling rotation speed = (PV charging current / PV charging maximum current)*G.

[0184] Referring to FIG. 11, in some embodiments, the step 03 includes:

[0185] 031: in the case of charging the energy storage system, controlling the fan to rotate at the greater value of the core cooling rotation speed, the first power cooling rotation speed and the fourth power cooling rotation speed;

[0186] 032: in the case of discharging the energy storage system, controlling the fan to rotate at the greater value of the core cooling rotation speed, the second power cooling rotation speed, the third power cooling rotation speed and the fourth power cooling rotation speed.

[0187] Thus, the working state is divided into two cases of charging and discharging, which is conducive to more quickly and accurately determining the rotation speed of the fan.

[0188] In some embodiments, the sub-steps 031 and 032 are implemented by the control module 13, or in other words, the control module 13 can be used to control the fan to rotate at the greater value of the core cooling rotation speed, the first power cooling rotation speed and the fourth power cooling rotation speed in the case of charging the energy storage system, or control the fan to rotate at the greater value of the core cooling rotation speed, the second power cooling rotation speed, the third power cooling rotation speed and the fourth power cooling rotation speed in the case of discharging the energy storage system.

[0189] In some embodiments, the processor 20 can be configured to control the fan to rotate at the maximum of the core cooling speed, the first power cooling speed and the fourth power cooling speed when the energy storage system is charging, or to rotate at the maximum of the core cooling speed, the second power cooling speed, the third power cooling speed and the fourth power cooling speed when the energy storage system is discharging.

[0190] Specifically, when the mains power is input, it can be divided into two cases, namely, the charging mode or the charging and discharging mode. However, in the charging and discharging mode, the mains power can be directly introduced into the branch during discharging without passing through the power conversion circuit board. Therefore, only the third power cooling speed needs to be considered when the charging mode.

[0191] Similarly, when the solar charging is input, it can also be divided into two cases, namely, the charging mode or the charging and discharging mode. Since the power conversion circuit board needs to be used in both cases, the fourth power cooling speed needs to be considered in both the charging mode and the discharging mode.

[0192] Further, in the embodiments of the present application, the fan is controlled to rotate at the maximum of the core cooling speed, the first power cooling speed and the fourth power cooling speed when the energy storage system is charging, and to rotate at the maximum of the core cooling speed, the second power cooling speed, the third power cooling speed and the fourth power cooling speed when the energy storage system is discharging.

[0193] The embodiments of the present application also provide a non-volatile computer readable storage medium, which stores a computer program. When the computer program is executed by the processor 20, the control method of any one of the above is implemented.

[0194] In the embodiments described above, all or part of the embodiments can be implemented by software, hardware, firmware or any combination thereof. When implemented by software, all or part of the embodiments can be implemented in the form of a computer program product. The computer program product includes one or more computer instructions. When the computer program instructions are loaded and executed on a computer, all or part of the processes or functions described in the embodiments of the present application are generated. The computer can be a general purpose computer, a special purpose computer, a computer network, or other programmable devices. The computer instructions can be stored in a computer readable storage medium or transmitted from one computer readable storage medium to another computer readable storage medium, for example, the computer instructions can be transmitted from one website site, computer, server or data center to another website site, computer, server or data center through wired (such as coaxial cable, optical fiber, digital subscriber line (DSL)) or wireless (such as infrared, wireless, microwave, etc.) mode. The computer readable storage medium can be any available medium that can be accessed by a computer or a data storage device such as a server, data center, etc. integrated with one or more available media. The available media can be magnetic media (such as floppy disk, hard disk, magnetic tape), optical media (such as digital video disc (DVD)), or semiconductor media (such as solid state disk (SSD)) and the like.

[0195] In the description of the present specification, the description of the terms "certain embodiments", "one embodiment", "some embodiments", "illustrative embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials or characteristics described in connection with the embodiments or examples are included in at least one embodiment or example of the present application. In the present specification, the illustrative description of the above terms does not necessarily mean the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0196] In addition, the terms "first", "second" are used only for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of indicated technical features. Therefore, the features defined with "first", "second" can explicitly or implicitly include at least one of the features. In the description of the present application, the meaning of "a plurality of" is at least two, for example, two, three, unless otherwise specifically limited.

[0197] Although the embodiments of the present application have been shown and described above, it is understood that the above-described embodiments are exemplary and are not to be construed as limiting the present application, and that changes, modifications, substitutions and variations can be made by those skilled in the art without departing from the scope of the present application, which is defined by the claims and their equivalents.

Claims

1. A control method for controlling a fan on a power conversion circuit board, wherein, The control method includes: The core cooling speed is determined based on the core temperature of the power conversion circuit board. Multiple power cooling speeds are determined based on the thermal radiation temperature of the power conversion circuit board and the charging and discharging power of the energy storage system using the power conversion circuit board. The fan is controlled to rotate at the larger of the core cooling speed and the multiple power cooling speeds.

2. The control method according to claim 1, wherein, The core temperature is the maximum temperature of the core components of the power conversion circuit board, and the core components include an inverter circuit, a buck-boost circuit, and / or an MPPT circuit.

3. The control method according to claim 1 or 2, wherein, The step of determining the core cooling speed based on the core temperature of the power conversion circuit board includes: When the core temperature is lower than the start-up temperature, the core cooling speed is determined to be 0. When the core temperature is greater than or equal to the start-up temperature and less than the overheating temperature, the core cooling speed is determined to gradually increase from the preset speed of the fan to the maximum speed of the fan as the core temperature increases. When the core temperature is greater than or equal to the overheating temperature, the core cooling speed is determined to be the maximum speed of the fan.

4. The control method according to claim 3, wherein, The rate of increase of the core cooling rotation speed gradually increases as the core temperature rises.

5. The control method according to any one of claims 1-4, wherein, The determination of multiple power cooling speeds based on thermal radiation temperature and the charging / discharging power of the energy storage system using the power conversion circuit board includes: The upper limit coefficient of rotational speed is determined based on the aforementioned thermal radiation temperature; The plurality of power cooling speeds are determined based on the upper limit coefficient of the rotation speed and the charging and discharging power.

6. The control method according to claim 5, wherein, The step of determining the upper limit coefficient of rotational speed based on the thermal radiation temperature includes: When the thermal radiation temperature is less than the first preset temperature, the upper limit coefficient of the rotation speed is determined to be the first preset value; When the thermal radiation temperature is greater than or equal to the first preset temperature and less than the second preset temperature, the upper limit coefficient of the rotational speed is determined to gradually increase from the first preset value to 1 as the thermal radiation temperature increases. When the thermal radiation temperature is greater than or equal to the second preset temperature, the upper limit coefficient of the rotation speed is determined to be 1.

7. The control method according to claim 6, wherein, The first preset temperature is the thermal radiation temperature when the fan speed is at a preset speed and the power of the power conversion circuit board reaches its rated power, and / or The second preset temperature is the thermal radiation temperature when the fan speed is at its maximum speed and the power of the power conversion circuit board reaches its rated power.

8. The control method according to claim 6 or 7, wherein, The rate of increase of the upper limit coefficient of rotational speed gradually increases with the increase of the thermal radiation temperature.

9. The control method according to any one of claims 5-8, wherein, Determining the plurality of power cooling speeds based on the upper limit coefficient of the rotation speed and the charging / discharging power includes: Obtain the output current and rated output current of the power conversion circuit board; The first power cooling speed is calculated based on the output current, the rated output current, and the upper limit coefficient of the rotational speed.

10. The control method according to any one of claims 5-8, wherein, Determining the plurality of power cooling speeds based on the upper limit coefficient of the rotation speed and the charging / discharging power includes: Obtain the AC charging current and the maximum AC charging current of the energy storage device; The second power cooling speed is calculated based on the mains charging current, the maximum mains charging current, and the upper limit coefficient of the rotation speed.

11. The control method according to any one of claims 5-8, wherein, Determining the plurality of power cooling speeds based on the upper limit coefficient of the rotation speed and the charging / discharging power includes: Obtain the mains input current and maximum input current limit of the power conversion circuit board; The third power cooling speed is calculated based on the mains input current, the maximum input current limit, and the speed limit coefficient.

12. The control method according to any one of claims 5-8, wherein, Determining the plurality of power cooling speeds based on the upper limit coefficient of the rotation speed and the charging / discharging power includes: Obtain the PV charging current and the maximum PV charging current of the power conversion circuit board; The fourth power cooling speed is calculated based on the PV charging current, the maximum PV charging current, and the upper limit coefficient of the rotation speed.

13. The control method according to any one of claims 1-12, wherein, The control of the fan to rotate at the larger of the core cooling speed and the plurality of power cooling speeds includes: While the energy storage system is charging, the fan is controlled to rotate at the larger of the core cooling speed, the first power cooling speed, and the fourth power cooling speed. When the energy storage system is discharging, the fan is controlled to rotate at the largest value of the core cooling speed, the second power cooling speed, the third power cooling speed, and the fourth power cooling speed.

14. A control device for controlling a fan on an energy conversion circuit board, wherein, include: The first calculation module is used to determine the core cooling speed based on the core temperature of the power conversion circuit board. The second calculation module is used to determine multiple power cooling speeds based on the thermal radiation temperature of the power conversion circuit board and the charging and discharging power of the energy storage system using the power conversion circuit board. The control module is used to control the fan to rotate at the larger value of the core cooling speed and the multiple power cooling speeds.

15. A control system, wherein, It includes a processor and a memory, the memory storing a computer program that, when executed by the processor, causes the processor to implement the instructions of the control method according to any one of claims 1-13.

16. A non-volatile computer-readable storage medium, wherein, The computer-readable storage medium stores a computer program that, when executed by a processor, implements the control method according to any one of claims 1-13.

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