Fan control method, inverter and energy storage system

Abstract

The invention discloses a fan control method, an inverter and an energy storage system. The control method is used for the inverter, operation data of the inverter in different environments and when the inverter operates in multiple working modes are obtained, the operation data comprise temperature data, voltage data, power data and current data, and the temperature data are temperature data of multiple temperature detection points; respectively solving correlation coefficients of the temperature of the inverter and the external environment temperature, voltage and power of the inverter according to the operation data and a fitting algorithm; solving a target coefficient of the correlation coefficient and the rotating speed duty ratio of the fan according to the operation data; constructing a rotating speed duty ratio control equation about the fan according to the target coefficient; the target rotating speed of the fan is solved according to the rotating speed duty ratio control equation and the current operation data of the highest rotating speed inverter of the fan; controlling the fan to work according to the target rotating speed. Thus, intelligent control over the fan can be achieved under different working conditions, and energy waste is avoided while normal operation of the inverter is guaranteed.

Description

Technical Field

[0001] The present application relates to the field of energy storage technology, and in particular to a fan control method, an inverter, and an energy storage system. Background Art

[0002] An inverter is a device that converts direct current (DC) into alternating current (AC) or one form of direct current into another form of direct current. It is widely used in various electronic devices, power systems, or renewable energy systems (such as solar and wind energy systems). Since the inverter generates heat during operation, a fan is required to dissipate heat to ensure its normal operation and extend its service life. However, due to the differences in the internal layout of the inverter and the components of each module, it is easy to cause the fan speed to be unstable, resulting in energy waste. Summary of the invention

[0003] The present application aims to solve at least one of the technical problems existing in the prior art. To this end, the present application needs to provide a fan control method, an inverter and an energy storage system.

[0004] A fan control method according to an embodiment of the present application is used for an inverter, and the control method includes:

[0005] Acquiring operating data of the inverter when it operates in different environments and in multiple operating modes, the operating data including temperature data, voltage data, power data, and current data of multiple temperature detection points in the inverter, where the positions of the temperature detection points are related to the device layout of the inverter;

[0006] Solving the correlation coefficients between the temperature of the inverter and the external environment temperature, voltage and power of the inverter respectively according to the operating data and the fitting algorithm;

[0007] Solving the correlation coefficient and the target coefficient of the speed duty cycle of the fan according to the operating data;

[0008] Constructing a speed duty cycle control equation for the fan according to the target coefficient;

[0009] Solving the target speed of the fan according to the speed duty cycle control equation, the maximum speed of the fan and the current operation data of the inverter;

[0010] The fan is controlled to operate according to the target rotation speed.

[0011] In some embodiments, the temperature detection points include an air inlet position, an air outlet position, a resonant converter position, and a power factor correction module position; the voltage data includes at least one of an AC terminal voltage and a battery terminal voltage, the current data includes at least one of an AC terminal current and a battery terminal current, and the power data includes at least one of an AC terminal power and a battery terminal power.

[0012] In some implementations, solving the target speed of the fan according to the speed duty cycle control equation, the maximum speed of the fan, and current operating data of the inverter includes:

[0013] When any temperature in the current temperature data is greater than or equal to a preset temperature threshold, the maximum speed of the fan is used as the target speed; or

[0014] When all temperatures in the current temperature data are less than a preset temperature threshold, the current battery terminal voltage, the AC terminal voltage, the battery terminal power and the temperature at the air inlet position are input into the speed duty cycle control equation to solve the speed duty cycle of the fan;

[0015] The target speed is calculated based on the speed duty cycle and the maximum speed of the fan.

[0016] In some embodiments, controlling the fan to operate according to the target speed includes:

[0017] When the target speed is within the range of the lowest speed and the highest speed of the fan, controlling the fan to operate at the target speed; or

[0018] When the target speed is greater than the maximum speed of the fan, controlling the fan to operate at the maximum speed; or

[0019] When the target rotation speed is lower than the minimum rotation speed of the fan, the fan is controlled to operate at the minimum rotation speed.

[0020] In some embodiments, the calculation expression of the speed duty cycle control equation includes:

[0021] D_FAN_Control(VLVDC,PLVDC,Ta,Vac):=(VLVDC-48) 2 ·K_Vdc+PLVDC·K_Pdc+Ta·K_Temp+(264-Vac)·K_Vac

[0022] Among them, VLVDC is the battery terminal voltage, PLVDC is the battery terminal power, Ta is the temperature at the air inlet position, Vac is the AC terminal voltage, K_Vdc is the target coefficient of the fan speed duty cycle and the battery terminal voltage, K_Pdc is the target coefficient of the fan speed duty cycle and the battery terminal power, K_Temp is the target coefficient of the fan speed duty cycle and the temperature at the air inlet position, and K_Vac is the target coefficient of the fan speed duty cycle and the AC terminal voltage.

[0023] In some embodiments, the control method further comprises:

[0024] Obtaining the current working mode of the inverter;

[0025] When the current working mode is the AC charging mode and the current operating data meets the first preset condition, starting the fan; or

[0026] When the current working mode is the inverter discharge mode and the current operating data meets the second preset condition, the fan is started.

[0027] In some embodiments, the first preset condition includes one of the following: the battery terminal current of the inverter is greater than or equal to a first preset current threshold, the temperature at the location of the power factor correction module is greater than or equal to a first temperature threshold, and the temperature at the location of the resonant converter is greater than or equal to a second temperature threshold;

[0028] The second preset condition includes: the battery terminal power is greater than a first power threshold, the temperature at the power factor correction module position is greater than or equal to a first temperature threshold, and the temperature at the resonant converter position is greater than or equal to a second temperature threshold.

[0029] In some embodiments, when the working mode is the charging mode and the temperature at the air inlet position is less than a third temperature threshold, the maximum operating speed of the fan is 75% of the maximum speed; or

[0030] When the working mode is the charging mode, the temperature at the air inlet position is greater than a fourth temperature threshold, and the charging current is greater than a first current threshold, the rotation speed of the fan is set to a maximum rotation speed.

[0031] In some embodiments, the inverter includes a temperature sensor located at the temperature detection point, and the operation data of the inverter under different environments and in multiple working modes are obtained, including:

[0032] The temperature of the temperature detection point is collected by the temperature sensor and the temperature collector respectively;

[0033] The temperature collected by the temperature collector is corrected against the temperature collected by the temperature sensor to obtain the temperature data.

[0034] In certain embodiments, the operation modes include at least a plurality of modes selected from the group consisting of AC charging, inverter charging, inverter discharging, PV charging, AC charging and PV charging, AC charging and inverter discharging, and PV charging and inverter discharging.

[0035] In certain embodiments, the fitting algorithm comprises at least one of a linear fit, a Gaussian fit, or a smooth curve.

[0036] The inverter of the embodiment of the present application includes a processor and a memory, wherein the memory stores a computer program. When the computer program is executed by the processor, the processor implements the control method.

[0037] The energy storage system of the implementation mode of the present application includes the inverter described above.

[0038] In the control method, inverter and energy storage system of the implementation mode of the present application, operating data such as temperature data, voltage data, power data and current data of multiple temperature detection points under different environments and in multiple operating modes are obtained, and the correlation coefficients between the temperature of the inverter and the external ambient temperature, voltage and power of the inverter are respectively solved according to the operating data and the fitting algorithm, so as to obtain the influence of the temperature of the inverter by the external ambient temperature, voltage and power respectively; then the correlation coefficient and the speed duty cycle of the fan are calibrated to obtain the target coefficient; and a speed duty cycle control equation for the fan is constructed according to the target coefficient, so that there is a mapping relationship between the speed duty cycle of the fan and the external ambient temperature, voltage and power; in this way, the target speed of the fan can be solved according to the speed duty cycle control equation, the maximum speed of the fan and the current operating data of the inverter to control the operation of the fan, thereby realizing intelligent control of the fan under different working conditions, different states and differences in power devices, while ensuring the normal operation of the inverter and avoiding energy waste.

[0039] Additional aspects and advantages of the present application will be given in part in the description below, and in part will become apparent from the description below, or will be learned through the practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] The above and / or additional aspects and advantages of the present application will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0041] Figure 1 It is a flowchart of a fan control method according to an embodiment of the present application.

[0042] Figure 2It is a module schematic diagram of the inverter according to the implementation mode of the present application.

[0043] Figure 3 Schematic diagram of the relationship between the battery terminal voltage and the fan speed duty cycle in an embodiment of the present application.

[0044] Figure 4-8 It is a flowchart of a fan control method according to an embodiment of the present application. DETAILED DESCRIPTION

[0045] The embodiments of the present application are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present application, and cannot be understood as limiting the present application.

[0046] In the description of this application, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of this application, "plurality" means two or more, unless otherwise clearly and specifically defined.

[0047] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection or an integral connection; it can be a mechanical connection, an electrical connection, or can communicate with each other; it can be a direct connection, or it can be indirectly connected through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0048] See also Figure 1 The present application embodiment provides a fan control method for an inverter, the control method comprising:

[0049] 01. Obtain the operating data of the inverter under different environments and in multiple working modes. The operating data includes temperature data, voltage data, power data and current data of multiple temperature detection points in the inverter. The location of the temperature detection point is related to the device layout of the inverter.

[0050] 02. According to the operating data and the fitting algorithm, the correlation coefficients between the temperature of the inverter and the external ambient temperature, voltage and power of the inverter are respectively solved;

[0051] 03. Solve the correlation coefficient and the target coefficient of the fan speed duty cycle based on the operating data;

[0052] 04. Construct the speed duty cycle control equation of the fan according to the target coefficient;

[0053] 05. Calculate the target speed of the fan based on the speed duty cycle control equation, the maximum speed of the fan and the current operating data of the inverter;

[0054] 06. Control the fan operation according to the target speed.

[0055] The embodiment of the present application also provides an inverter, including a fan, a processor and a memory, the memory storing a computer program, when the computer program is executed by the processor, the processor implements the above-mentioned fan control method, that is, the processor can be used to obtain operating data of the inverter when it operates in different environments and in multiple operating modes, the operating data including temperature data, voltage data, power data and current data of multiple temperature detection points in the inverter, the positions of the temperature detection points are related to the device layout of the inverter; and the correlation coefficient between the temperature of the inverter and the external ambient temperature, voltage and power of the inverter are respectively solved according to the operating data and the fitting algorithm; the processor can also be used to solve the correlation coefficient and the target coefficient of the speed duty cycle of the fan according to the operating data, construct a speed duty cycle control equation for the fan according to the target coefficient, solve the target speed of the fan according to the speed duty cycle control equation, the maximum speed of the fan and the current operating data of the inverter, and control the fan operation according to the target speed.

[0056] In the control method and inverter of the implementation mode of the present application, operating data such as temperature data, voltage data, power data and current data of multiple temperature detection points under different environments and in multiple operating modes are obtained, and the correlation coefficients between the temperature of the inverter and the external ambient temperature, voltage and power of the inverter are respectively solved according to the operating data and the fitting algorithm, so as to obtain the influence of the temperature of the inverter by the external ambient temperature, voltage and power respectively; then the correlation coefficient and the speed duty cycle of the fan are calibrated to obtain the target coefficient; and according to the target coefficient, a speed duty cycle control equation for the fan is constructed, so that there is a mapping relationship between the speed duty cycle of the fan and the external ambient temperature, voltage and power; in this way, the target speed of the fan can be solved according to the speed duty cycle control equation, the maximum speed of the fan and the current operating data of the inverter to control the operation of the fan, thereby realizing intelligent control of the fan under different working conditions, different states and differences in power devices, while ensuring the normal operation of the inverter and avoiding energy waste.

[0057] See also Figure 2Specifically, the inverter can be an energy storage inverter. It can be understood by those skilled in the art that the energy storage inverter is a device connected between the energy storage battery and the power grid to realize bidirectional conversion of electric energy. It can store the direct current generated by renewable energy (such as solar energy, wind energy, etc.), and convert the stored electric energy into alternating current output when necessary to meet the electricity demand of households, enterprises or power grids. The inverter may include power devices such as fans, input common mode, PV modules, PV capacitors, PV inductors, LLC capacitors, LV_LCC, LV sampling circuits, LLC transformers, resonant inductors, resonant capacitors, PFC, PFC inductors, bus capacitors, HV_LLC, input common mode, output common mode, and AC terminals, battery terminals, PV input terminals, and other ports. Among them, the fan may include a first fan and a second fan, the first fan is used to inhale air from the outside into the inverter, and the second fan is used to discharge the air of the inverter for heat dissipation. It can be understood that the layout of each component in the inverter can be set as needed, that is, the layout of each component in the inverter is not limited.

[0058] The inverter also includes a plurality of temperature detection points, each of which is provided with a temperature sensor, and the temperature sensor is used to detect the temperature of the temperature detection point. The plurality of temperature detection points can be arranged at the positions of the first fan, the second fan, the PFC, the HV_LLC, the PV or the LV_LLC, etc. It can be understood that the temperature detection point arranged near the first fan is used to detect the external ambient temperature of the inverter, the temperature detection point arranged near the second fan is used to detect the internal ambient temperature (internal maximum temperature point) of the inverter, the temperature detection point arranged near the first fan is used to detect the external ambient temperature of the inverter, the temperature detection point arranged at the PFC is used to detect the temperature of the PFC, the temperature detection point arranged at the PV is used to detect the temperature of the PFC, the temperature detection point arranged at the HV_LLC is used to detect the temperature of the HV_LLC, and the temperature detection point arranged at the LV_LLC is used to detect the temperature of the LV_LLC. It can be understood that the temperature detection points are not limited to being arranged at the above positions only, that is, the temperature detection points can be arranged according to the layout and quantity of each component, and the distribution position of the temperature detection points is not unique.

[0059] The temperature sensor may be, but is not limited to, a thermocouple, a thermal resistor, a semiconductor temperature sensor, etc. For example, in this embodiment, the temperature sensor may be described by taking a thermocouple as an example. It is understandable that the thermocouple has a wide range of uses, can measure high temperature, low temperature and occasions where the temperature changes rapidly, and has low cost and does not require power supply.

[0060] Please refer to further Figure 2In this embodiment, in order to improve the heat dissipation efficiency of the inverter, the layout of the components in the inverter can be: the output common mode, FPC and HV_LLC are arranged side by side to form the first row, PV and LV_LLC are arranged side by side to form the second row, the first row and the second row are arranged at intervals to form an air duct, and the direction of the air duct is the length direction of the inverter. The fan may include a first fan and a second fan, and the first fan and the second fan are respectively located on the two short sides of the inverter and are arranged directly opposite to the air duct.

[0061] The bus capacitor, PFC inductor, HV_MCU, resonant capacitor, resonant inductor, LLC transformer and HV sampling circuit are arranged in parallel and spaced in the air duct between the first row and the second row, and the bus capacitor is arranged close to the second fan, the PV capacitor and PV inductor are arranged in parallel and spaced on one side of the PV, and the LV_MCU, LLC capacitor and LV sampling circuit are arranged in parallel and spaced on one side of the LV_LLC to form a row with the PV capacitor and PV inductor. The input common mode is located on the side of the PV close to the second fan, and the output common mode is located on the side of the FPC close to the second fan.

[0062] The AC end includes an AC input end and an AC output end. The AC input end, the PV input end and the battery end are sequentially arranged at intervals on one of the long sides of the inverter, and the AC input end is arranged close to the second fan, and the AC output end is located on the other long side of the inverter and is arranged close to the second fan. Among them, the AC output end and the AC input end are used to connect to an AC power source or an AC load. The battery end is used to achieve connection with an energy storage battery. The input and input ends of the PV input end are connected to the solar module. It is used to convert the DC power generated by the solar module into AC power.

[0063] Please refer to further Figure 2 The energy storage device is equipped with four temperature detection points, namely T inlet , T outlet , T PFC , T LLC , where T inlet Placed near the first fan (at the air inlet), it detects the wind input from the outside, that is, the external ambient temperature of the inverter, T outlet Placed near the second fan (air inlet), it is used to detect the final outflow of various internal temperatures. It is also the highest internal temperature point, that is, the internal ambient temperature of the inverter. PFc Place it where the PFC or HV_LLC heats the most, T LLC Place it where the heat of the PV or LV_LLC module is highest. The temperature sensor may include four, which are set at T inlet , T outlet , T PFC , T LLCAmong the four temperature detection points, the temperatures of these temperature detection points are detected respectively.

[0064] The processor can be electrically connected to each component in each of the above-mentioned inverters to obtain the operating parameters of the inverter in real time. Among them, the temperature data can be obtained by the processor from the temperature sensor, and the voltage data, power data and current data can be detected from ports such as the AC input terminal, the AC output terminal, the PV input terminal and the battery terminal. In this way, the temperature data obtained by the processor may include temperature data of multiple temperature detection points in the inverter, and the temperature detection points include the air inlet position, the air outlet position, the resonant converter position, and the power factor correction module position; the voltage data includes but is not limited to the AC terminal voltage and the battery terminal voltage, the current data includes but is not limited to the AC terminal current and the battery terminal current, and the power data includes the AC terminal power and the battery terminal power. And, it can be understood that the power data can be directly obtained or calculated based on the voltage and current.

[0065] The internal temperature change of the inverter is related to the external ambient temperature, current, voltage and power. Therefore, in order to accurately reflect the correlation between the internal temperature change of the inverter and the ambient temperature, current, voltage and power, in step 01, multiple inverters can be operated in different environments and in multiple working modes to obtain operation data. The more operation data, the more accurate the correlation between the internal temperature of the inverter and the ambient temperature, current, voltage and power.

[0066] It should be noted that the environment may include but is not limited to normal temperature, high temperature, vacuum, high and low temperature alternating environment, etc. The working mode may include but is not limited to AC charging, inverter discharge, PV charging, AC charging + PV charging, AC charging + inverter discharge, PV charging + inverter discharge, etc.

[0067] After obtaining the operation data, the processor can fit at least multiple of the correlation coefficients of the temperature of the inverter and the external ambient temperature of the inverter, (input, output) voltage, (input, output) power and (input, output) current of the inverter respectively through the fitting algorithm and the operation data. For example, the processor fits the correlation coefficients of the temperature of the inverter and the external ambient temperature of the inverter and the input power according to the fitting algorithm. For another example, the processor fits the correlation coefficients of the temperature of the inverter and the external ambient temperature of the inverter, DC voltage and power according to the fitting algorithm and the operation data. For another example, the processor fits the correlation coefficients of the temperature of the inverter and the external ambient temperature of the inverter, AC voltage, DC voltage and power according to the fitting algorithm and the operation data. In this embodiment, the correlation coefficients of fitting the temperature of the inverter and the external ambient temperature of the inverter, AC voltage, DC voltage and power can be used as an example for explanation. That is, the correlation coefficient between the fitting temperature and the DC voltage of the inverter K_Vdc_Init ial, the correlation coefficient between the temperature and the power of the inverter K_Pdc_Init ial, the correlation coefficient between the fitting temperature and the external ambient temperature of the inverter K_Temp_Init ial, and the correlation coefficient between the fitting temperature and the AC voltage of the inverter K_Vac_Initial.

[0068] It should be noted that the fitting algorithm may include but is not limited to at least one of linear fitting, Gaussian fitting or smooth curve.

[0069] Further, the processor may set known quantities according to the operation data, so as to solve the correlation coefficient and the target coefficient of the speed duty cycle of the fan, and the known quantities include the average value of the battery terminal voltage, the average value of the battery power, the average value of the external ambient temperature, and the voltage range of the AC terminal voltage when the inverter is working. The target coefficient may include the target coefficient K_Vdc of the speed duty cycle of the fan and the battery terminal voltage, the target coefficient K_Pdc of the speed duty cycle of the fan and the battery terminal power, the target coefficient K_Temp of the speed duty cycle of the fan and the external ambient temperature, and the target coefficient K_Vac of the speed duty cycle of the fan and the AC terminal voltage.

[0070] The target coefficient of the fan speed duty cycle and the battery terminal voltage K_Vdc = K_Vdc_Initial / the average value of the battery terminal voltage, the target coefficient of the fan speed duty cycle and the battery terminal power K_Pdc = K_Pdc_Initial / the average value of the battery power, the target coefficient of the fan speed duty cycle and the external ambient temperature K_Temp = K_Temp_Initial / the average value of the external ambient temperature, the target coefficient of the fan speed duty cycle and the AC terminal voltage K_Vac = K_Vac_Initial / (the upper limit of the AC terminal voltage - the lower limit of the AC terminal voltage).

[0071] For example, in some examples, according to the operating data and the fitting algorithm, the correlation coefficient between the temperature and the DC voltage of the inverter is K_Vdc_Initial=0.3, the correlation coefficient between the temperature and the power of the inverter is K_Pdc_Initial=0.1, the correlation coefficient between the temperature and the external ambient temperature of the inverter is K_Temp_Initial=0.3, and the correlation coefficient between the temperature and the AC voltage of the inverter is K_Vac_Initial=0.4. If the average value of the battery terminal voltage is 42.7, the average value of the battery power is 2200, the average value of the external ambient temperature is 35, the upper limit value of the AC terminal voltage is 264, and the lower limit value of the voltage is 185, then the calculation formula is as follows:

[0072] K_Vdc=0.3 / 42.7=7.0258*10 -3

[0073] K_Pdc=0.1 / 2200=4.5455*10 -5

[0074] K_Temp=0.3 / 35=8.5714*10 -3

[0075] K_Vac=0.4 / (264-185)=5.0633*10 -3

[0076] The speed duty cycle control equation is used to solve the speed duty cycle of the fan. In the process of controlling the fan, the processor can obtain the current operating data in real time, and bring the data related to the speed duty cycle control equation in the current operating data into the speed duty cycle control equation to calculate the speed duty cycle of the fan, and then calculate the target speed based on the speed duty cycle and the maximum speed of the fan to control the fan to operate at the target speed.

[0077] In this way, through the implementation method of the present application, intelligent control of the fan under different external ambient temperatures, different states, power device differences, and different usage environments is achieved.

[0078] In some embodiments, the calculation expression of the speed duty cycle control equation may include:

[0079] D_FAN_Control(VLVDC,PLVDC,Ta,Vac):=(VLVDC-48) 2 ·K_Vdc+PLVDC·K_Pdc+Ta·K_Temp+(264-Vac)·K_Vac

[0080] Among them, VLVDC is the battery terminal voltage, PLVDC is the battery terminal power, Ta is the external ambient temperature at the air inlet position, Vac is the AC terminal voltage, K_Vdc is the target coefficient of the fan speed duty cycle and the battery terminal voltage, K_Pdc is the target coefficient of the fan speed duty cycle and the battery terminal power, K_Temp is the target coefficient of the fan speed duty cycle and the temperature at the air inlet position, and K_Vac is the target coefficient of the fan speed duty cycle and the AC terminal voltage.

[0081] See also Figure 3 ,The figure shows the fitting curve of the battery terminal voltage and the fan speed duty cycle obtained ,according to the speed duty cycle control equation when the inverter is ,operating under different working conditions.

[0082] See also Figure 4 , in certain embodiments, 01 comprises;

[0083] 011, respectively collect the temperature of the temperature detection point through the temperature sensor and the temperature acquisition device;

[0084] 012. Correct the temperature collected by the temperature acquisition device with the temperature collected by the temperature sensor to obtain temperature data.

[0085] In certain embodiments, the processor may be used to collect the temperature of the temperature detection point through a temperature sensor and a temperature acquisition device respectively; and correct the temperature collected by the temperature acquisition device against the temperature collected by the temperature sensor to obtain temperature data.

[0086] It should be noted that the temperature detected by the temperature sensor may be inaccurate in some extreme environments (such as high temperature environments) due to different environments, resulting in inaccurate temperature data. Therefore, in this application, an additional temperature acquisition device is also provided, which can measure the temperature of each position in the inverter with high temperature accuracy. When the inverter is operated in different environments and in multiple working modes, the processor can collect temperature data from the temperature sensor and the temperature acquisition device respectively, and correct the temperature data collected by the temperature sensor with the temperature data collected by the temperature acquisition device.

[0087] In this way, the accuracy of temperature data is ensured, thereby improving the control effect.

[0088] See also Figure 5 In some embodiments, 05 comprises:

[0089] 051, when any temperature in the current temperature data is greater than or equal to the preset temperature threshold, the maximum speed of the fan is used as the target speed; or

[0090] 052, when all temperatures in the current temperature data are less than the preset temperature threshold, the current battery terminal voltage, AC terminal voltage, battery terminal power and the temperature at the air inlet position are input into the speed duty cycle control equation to solve the speed duty cycle of the fan;

[0091] 053, solve the target speed based on the speed duty cycle and the maximum speed of the fan.

[0092] In some embodiments, the processor can be used to use the maximum speed of the fan as the target speed when any temperature in the current temperature data is greater than or equal to a preset temperature threshold, or to input the current battery terminal voltage, AC terminal voltage, battery terminal power and temperature at the air inlet position into the speed duty cycle control equation to solve the fan speed duty when all temperatures in the current temperature data are less than the preset temperature threshold; and solve the target speed based on the speed duty cycle and the maximum speed of the fan.

[0093] It should be noted that the preset temperature thresholds of the temperatures at different temperature detection points may be the same or different. For example, in some examples, T inlet 、T outlet 、T PFC 、T LLC Among the four temperature detection points, T inlet The preset temperature threshold can be 60 degrees Celsius, T outlet The preset temperature threshold can be 60 degrees Celsius, T PFC The preset temperature threshold can be 80 degrees Celsius, T LLC The preset temperature threshold value of can be 80 degrees Celsius. That is, if T inlet ≥60℃ or T outlet ≥60℃ or T PFC ≥80℃ or T LLC ≥80℃, the maximum speed of the fan is used as the target speed.

[0094] When all temperatures in the current temperature data are lower than the preset temperature threshold, the current battery terminal voltage, AC terminal voltage, battery terminal power and temperature at the air inlet position are input into the speed duty cycle control equation to solve the duty cycle, and the fan speed duty cycle obtained is multiplied by the maximum speed of the fan to obtain the target speed.

[0095] In addition, it should be noted that in order to avoid damage to the inverter due to over-temperature, each temperature detection point is also provided with an OTP protection point and an OTP recovery point, wherein the OTP protection point is used to trigger the OTP protection, and the OTP recovery point is used to turn off the OTP protection. If the processor detects that the temperature of any temperature detection point exceeds the temperature of the OTP protection point, the OTP protection function is triggered to cut off the power supply, and the OTP protection function is turned off at the OTP recovery point. The OTP protection point is greater than the preset temperature threshold.

[0096] In this example, at T inlet 、T outlet 、T PFC 、T LLC The OTP protection points and OTP recovery points in the four temperature detection points are shown in Table 1 below.

[0097] Temperature sensor location OTP protection point OTP recovery point <![CDATA[T inlet ]]> 65℃ 60℃ <![CDATA[T outlel ]]> 65℃ 60℃ <![CDATA[T PFC ]]> 90℃ 80℃ <![CDATA[T LLC ]]> 90℃ 80℃

[0098] Table 1

[0099] Please refer to step 6. In some embodiments, step 06 includes:

[0100] 061, when the target speed is within the range of the minimum speed and the maximum speed of the fan, the fan is controlled to operate at the target speed; or

[0101] 062, when the target speed is greater than the maximum speed of the fan, the fan is controlled to operate at the maximum speed; or

[0102] 063, when the target speed is less than the minimum speed of the fan, the fan is controlled to operate at the minimum speed.

[0103] In some embodiments, the processor is used to control the fan to operate at a target speed when the target speed is within the range of the fan's minimum speed and maximum speed; and to control the fan to operate at the maximum speed when the target speed is greater than the fan's maximum speed; and to control the fan to operate at the minimum speed when the target speed is less than the fan's minimum speed.

[0104] For example, in some examples, the minimum speed of the fan is 2000r / min and the maximum speed is 5500r / min. If the target speed is greater than 5500r / min, the fan is controlled to work at a speed of 5500r / min. If the target speed is less than 2000r / min, the fan is controlled to work at a speed of 2000r / min. If the target speed is in the range of 2000-5500r / min, the fan is directly controlled to work at the target speed.

[0105] See also Figure 7 In some embodiments, the control method further comprises:

[0106] 07, obtain the current working mode of the inverter;

[0107] 08. When the current working mode is the AC charging mode and the current operating data meets the first preset condition, start the fan; or

[0108] 09. When the current working mode is the inverter discharge mode and the current operating data meets the second preset condition, start the fan.

[0109] In some embodiments, the processor includes obtaining a current operating mode of the inverter; starting the fan when the current operating mode is an AC charging mode and the current operating data meets a first preset condition; or starting the fan when the current operating mode is an inverter discharge mode and the current operating data meets a second preset condition.

[0110] The first preset condition includes one of the battery terminal current of the inverter being greater than or equal to the first preset current threshold, the temperature at the position of the power factor correction module being greater than or equal to the first temperature threshold, and the temperature at the position of the resonant converter being greater than or equal to the second temperature threshold. The second preset condition includes one of the battery terminal power being greater than the first power threshold, the temperature at the position of the power factor correction module being greater than or equal to the first temperature threshold, and the temperature at the position of the resonant converter being greater than or equal to the second temperature threshold.

[0111] In this way, by setting the start-up conditions of the fan, energy waste in a low-power environment is avoided and the performance of the inverter is improved.

[0112] See also Figure 8 In some embodiments, the control method further comprises:

[0113] 11. When the working mode is the charging mode and the temperature at the air inlet is less than the third temperature threshold, the maximum operating speed of the fan is 75% of the maximum speed; or

[0114] 12. When the working mode is the charging mode, the temperature at the air inlet position is greater than the fourth temperature threshold and the charging current is greater than the first current threshold, the fan speed is set to the maximum speed.

[0115] In some embodiments, the processor is also used to set the maximum operating speed of the fan to 75% of the maximum speed when the operating mode is charging mode and the temperature at the air inlet position is less than a third temperature threshold; or to set the fan speed to the maximum speed when the operating mode is charging mode, the temperature at the air inlet position is greater than a fourth temperature threshold and the charging current is greater than the first current threshold.

[0116] It should be noted that the third temperature threshold is less than the fourth temperature threshold. In this embodiment, the third temperature threshold may be 35 degrees Celsius, the third temperature threshold may be 40 degrees Celsius, and the first current threshold may be 1A. That is, in the charging mode, if the temperature T inlet <35℃, the maximum operating speed of the fan is 75% of the maximum speed. inlet >40℃, and the charging current is greater than 1A, the speed is set to the highest speed.

[0117] It can be understood that the temperature T at the air inlet position inlet is the external ambient temperature, and the overall temperature of the inverter is greatly affected by the external ambient temperature. The temperature at the air inlet position is T inlet When the temperature is less than the third temperature threshold, the overall temperature of the inverter is mainly affected by the power devices during charging. Therefore, limiting the maximum speed can reduce energy consumption. If the external ambient temperature is too high and the inverter is in a charging mode with a high current, it is easy to cause the overall temperature of the inverter to be too high during charging. Therefore, heat dissipation needs to be strengthened. In this way, the heat dissipation efficiency is guaranteed when the inverter is in a high temperature environment and is charging with a high current.

[0118] An embodiment of the present application further provides an energy storage system, which includes the inverter of the above embodiment.

[0119] In the energy storage system of the implementation mode of the present application, by acquiring operating data when operating in different environments and in multiple operating modes, and solving the correlation coefficient between the temperature of the inverter and the external ambient temperature, voltage and power of the inverter according to the operating data and the fitting algorithm; solving the correlation coefficient and the target coefficient of the speed duty cycle of the fan according to the operating data; constructing a speed duty cycle control equation for the fan according to the target coefficient; solving the target speed of the fan according to the speed duty cycle control equation, the maximum speed of the fan and the current operating data of the inverter; and controlling the fan operation according to the target speed, in this way, intelligent control of the fan is achieved under different working conditions, and energy waste is avoided while ensuring the normal operation of the inverter.

[0120] In the description of this specification, the description with reference to the terms "one embodiment", "certain embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials, or characteristics described in conjunction with the embodiments or examples are included in at least one embodiment or example of the present application. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0121] Although the embodiments of the present application have been shown and described, those skilled in the art will appreciate that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present application, and that the scope of the present application is defined by the claims and their equivalents.

Claims

1. A fan control method for an inverter, characterized in that: The control method comprises: Acquiring operating data of the inverter when it operates in different environments and in multiple operating modes, the operating data including temperature data, voltage data, power data, and current data of multiple temperature detection points in the inverter, where the positions of the temperature detection points are related to the device layout of the inverter; Solving the correlation coefficients between the temperature of the inverter and the external environment temperature, voltage and power of the inverter respectively according to the operating data and the fitting algorithm; Solving the correlation coefficient and the target coefficient of the speed duty cycle of the fan according to the operating data; Constructing a speed duty cycle control equation for the fan according to the target coefficient; solving a target speed of the fan according to the speed duty cycle control equation, the maximum speed of the fan and current operating data of the inverter; and The fan is controlled to operate according to the target rotation speed.

2. The control method according to claim 1, characterized in that: The temperature detection points include the air inlet position, the air outlet position, the resonant converter position, and the power factor correction module position; the voltage data includes at least one of the AC terminal voltage and the battery terminal voltage, the current data includes at least one of the AC terminal current and the battery terminal current, and the power data includes at least one of the AC terminal power and the battery terminal power.

3. The control method according to claim 2, characterized in that: Solving the target speed of the fan according to the speed duty cycle control equation, the maximum speed of the fan and the current operation data of the inverter includes: When any temperature in the current temperature data is greater than or equal to a preset temperature threshold, the maximum speed of the fan is used as the target speed; or When all temperatures in the current temperature data are less than a preset temperature threshold, the current battery terminal voltage, the AC terminal voltage, the battery terminal power and the temperature at the air inlet position are input into the speed duty cycle control equation to solve the speed duty cycle of the fan; The target speed is calculated based on the speed duty cycle and the maximum speed of the fan.

4. The control method according to claim 3, characterized in that: The step of controlling the fan to operate according to the target rotation speed includes: When the target speed is within the range of the lowest speed and the highest speed of the fan, controlling the fan to operate at the target speed; or When the target speed is greater than the maximum speed of the fan, controlling the fan to operate at the maximum speed; or When the target rotation speed is lower than the minimum rotation speed of the fan, the fan is controlled to operate at the minimum rotation speed.

5. The control method according to claim 3, characterized in that: The calculation expression of the speed duty ratio control equation includes: D_FAN_Control(VLVDC,PLVDC,Ta,Vac):=(VLVDC-48) 2 ·K_Vdc+PLVDC.K_Pdc+Ta·K_Temp+(264-Vac)·K_Vac Among them, VLVDC is the battery terminal voltage, PLVDC is the battery terminal power, Ta is the temperature at the air inlet position, Vac is the AC terminal voltage, K_Vdc is the target coefficient of the fan speed duty cycle and the battery terminal voltage, K_Pdc is the target coefficient of the fan speed duty cycle and the battery terminal power, K_Temp is the target coefficient of the fan speed duty cycle and the temperature at the air inlet position, and K_Vac is the target coefficient of the fan speed duty cycle and the AC terminal voltage.

6. The control method according to claim 2, characterized in that: The control method further comprises: Obtaining the current working mode of the inverter; When the current working mode is the AC charging mode and the current operating data meets the first preset condition, starting the fan; or When the current working mode is the inverter discharge mode and the current operating data meets the second preset condition, the fan is started.

7. The control method according to claim 6, characterized in that: The first preset condition includes one of the following: the battery terminal current of the inverter is greater than or equal to a first preset current threshold, the temperature at the position of the power factor correction module is greater than or equal to a first temperature threshold, and the temperature at the position of the resonant converter is greater than or equal to a second temperature threshold; The second preset condition includes: the battery terminal power is greater than a first power threshold, the temperature at the power factor correction module position is greater than or equal to a first temperature threshold, and the temperature at the resonant converter position is greater than or equal to a second temperature threshold.

8. The control method according to claim 6, characterized in that: The control method also includes: When the working mode is the charging mode and the temperature at the air inlet position is less than a third temperature threshold, the maximum operating speed of the fan is 75% of the maximum speed; or When the working mode is the charging mode, the temperature at the air inlet position is greater than a fourth temperature threshold, and the charging current is greater than a first current threshold, the rotation speed of the fan is set to a maximum rotation speed.

9. The control method according to claim 1, characterized in that: The inverter includes a temperature sensor located at the temperature detection point, and the operation data of the inverter when operating in different environments and in multiple working modes is obtained, including: The temperature of the temperature detection point is collected by the temperature sensor and the temperature collector respectively; The temperature collected by the temperature collector is corrected against the temperature collected by the temperature sensor to obtain the temperature data.

10. The control method according to claim 1, characterized in that: The operation modes include at least a plurality of modes selected from the group consisting of AC charging, inverter charging, inverter discharging, PV charging, AC charging and PV charging, AC charging and inverter discharging, and PV charging and inverter discharging.

11. The control method according to claim 1, characterized in that: The fitting algorithm includes at least one of linear fitting, Gaussian fitting or smooth curve.

12. An inverter, characterized in that: The invention comprises a processor and a memory, wherein the memory stores a computer program, and when the computer program is executed by the processor, the processor implements the control method according to any one of claims 1 to 11.

13. An energy storage system, characterized in that: Includes the inverter as claimed in claim 12.

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