Converter switching frequency adjusting method

Abstract

The invention provides a method for adjusting the switching frequency of a converter. The method comprises the following steps: acquiring operation information of the converter; according to the operation information, respectively adopting an index model corresponding to each performance in a plurality of performances of the converter, and determining an operation index corresponding to each performance; according to the operation index corresponding to each performance, outputting a satisfaction value, a switching frequency adjustment value and a wave sending mode corresponding to each performance by adopting an adjuster corresponding to each performance to obtain a plurality of satisfaction values, a plurality of switching frequency adjustment values and a plurality of wave sending modes; according to the satisfaction value, the switching frequency adjustment value and the wave sending mode corresponding to each performance, determining a target switching frequency adjustment value from the plurality of switching frequency adjustment values by adopting a decision maker, and determining a target wave sending mode from the plurality of wave sending modes; and according to the target switching frequency adjustment value and the target wave sending mode, adopting an adjustment strategy of a decision maker to adjust the converter. The method provided by the invention improves the comprehensive performance of the converter.

Description

Technical Field

[0001] The present invention relates to the technical field of converter control, and in particular to a method for adjusting a converter switching frequency. Background Art

[0002] The inverter, which is based on power semiconductor devices and uses computers as control components, is responsible for power conversion and AC / DC conversion. It is widely used in new energy industries such as wind power, photovoltaics, hydrogen production, traction transmission, and power supply.

[0003] The power semiconductor devices used in the converter are usually insulated-gate bipolar transistors (IGBTs), which have the characteristics of high voltage, high current, fast switching speed and low loss. IGBTs are assembled into success rate modules, and the pulse width modulation (PWM) method is used to calculate the duty cycle of each switching cycle. In the same usage scenario, the PWM switching frequency affects many performances of the converter, including module loss, module temperature, overcurrent capacity, total harmonic distortion (THD), condensation temperature, midpoint ripple, etc.

[0004] The existing methods for adjusting the switching frequency of converters have a strong single performance. Although these methods can meet certain performance requirements, they cannot meet other performance requirements of the converter. In complex application scenarios, the results of existing methods for adjusting the switching frequency are often conflicting. For example, under high ambient temperature and high grid harmonic conditions, high ambient temperature requires lowering the switching frequency to improve the overcurrent capacity, but high grid harmonics require increasing the switching frequency to reduce harmonics. If only one of the indicators is considered and the adjustment range is inappropriate, it will lead to "loss of one while focusing on the other", which will deteriorate the performance of the converter. Summary of the invention

[0005] The present invention provides a method for adjusting the switching frequency of a converter to improve the comprehensive performance of the converter.

[0006] An embodiment of the present invention provides a method for adjusting the switching frequency of a converter, which is applied to the converter, and the method includes:

[0007] Obtaining the operation information of the converter;

[0008] According to the operation information, an index model corresponding to each of the multiple performances of the converter is respectively used to determine the operation index corresponding to each performance;

[0009] According to the operating index corresponding to each performance, the regulator corresponding to each performance is used to output the satisfaction value, the switching frequency adjustment value and the wave transmission mode corresponding to each performance, so as to obtain multiple satisfaction values, multiple switching frequency adjustment values ​​and multiple wave transmission modes;

[0010] According to the satisfaction value, the switching frequency adjustment value and the wave transmission mode corresponding to each performance, a decision maker is used to determine a target switching frequency adjustment value from a plurality of switching frequency adjustment values, and to determine a target wave transmission mode from a plurality of wave transmission modes;

[0011] According to the target switching frequency adjustment value and the target wave generation mode, the adjustment strategy of the decision maker is adopted to adjust the converter.

[0012] In a possible implementation, before determining a target switching frequency adjustment value from a plurality of switching frequency adjustment values ​​using a decision maker and determining a target switching frequency adjustment mode from a plurality of switching frequency adjustment modes according to the satisfaction value, the switching frequency adjustment value and the wave generation mode corresponding to each performance, the method further includes:

[0013] According to the converter operation state in the operation information, an adjuster corresponding to the converter state performance is adopted to determine a satisfaction value, a switching frequency adjustment value and a wave generation mode corresponding to the converter operation state performance.

[0014] In a possible implementation, when the multiple performances include an overcurrent control performance, an index model corresponding to each performance of the multiple performances of the converter is respectively used according to the operation information to determine the operation index corresponding to each performance, including:

[0015] According to the active command input, reactive command input, grid voltage and generator speed in the operation information, a converter power model corresponding to the overcurrent control performance is adopted to determine the operation current of the converter power module.

[0016] In a possible implementation, when the multiple performances include module loss control performance, according to the operation information, an index model corresponding to each performance of the multiple performances of the converter is respectively used to determine the operation index corresponding to each performance, including:

[0017] According to the water temperature and / or ambient temperature in the operation information, as well as the current frequency, current amplitude, switching frequency, wave generation mode, module thermistor (Negative Temperature Coefficient, NTC) temperature and DC bus voltage, the loss is determined by using a converter loss model corresponding to the module loss control performance.

[0018] In a possible implementation, when the multiple performances also include module junction temperature control performance, according to the operation information, the index model corresponding to each performance in the multiple performances of the converter is respectively used to determine the operation index corresponding to each performance, and further includes:

[0019] According to the water temperature or ambient temperature, current frequency, current amplitude, switching frequency, wave generation mode, module NTC temperature, DC bus voltage and loss in the operation information, a converter junction temperature model corresponding to the module junction temperature control performance is adopted to determine the junction temperature of the converter module.

[0020] In a possible implementation, when the multiple performances include condensing temperature control performance, according to the operation information, an index model corresponding to each performance of the multiple performances of the converter is respectively used to determine the operation index corresponding to each performance, including:

[0021] According to the temperature inside the converter cabinet, the humidity inside the cabinet and the module radiator temperature in the operation information, the condensation temperature is determined by using a module condensation model corresponding to the module junction temperature control performance.

[0022] In a possible implementation, when the multiple performances include harmonic content control performance, according to the operation information, the index model corresponding to each performance of the multiple performances of the converter is respectively used to determine the operation index corresponding to each performance, including:

[0023] According to the three-phase instantaneous current and three-phase instantaneous voltage in the operation information, the harmonic content is determined by using a harmonic analysis model corresponding to the harmonic content control performance.

[0024] In a possible implementation, when the multiple performances include midpoint ripple control performance, according to the operation information, an index model corresponding to each performance of the multiple performances of the converter is respectively used to determine the operation index corresponding to each performance, including:

[0025] According to the three-phase duty cycle, three-phase instantaneous current and bus capacitance value in the operation information, a ripple analysis model corresponding to the midpoint ripple control performance is adopted to determine the midpoint ripple voltage peak value.

[0026] In a possible implementation, according to the operating index corresponding to each performance, a regulator is used to determine the satisfaction value, the switching frequency adjustment value and the wave generation mode corresponding to each performance, including:

[0027] When the first operating indicator is greater than a preset maximum value of the first operating indicator, an adjuster is used to determine a target operating indicator range satisfied by the first operating indicator according to a plurality of operating indicator ranges corresponding to the first operating indicator; wherein the first operating indicator represents any operating indicator among the operating indicators corresponding to each performance;

[0028] Adopting an adjuster to determine the satisfaction value, the switching frequency adjustment value and the wave transmission mode according to the corresponding relationship between the target operation index range and the satisfaction value, the switching frequency adjustment value and the wave transmission mode;

[0029] When the first operating indicator is less than or equal to a preset maximum value of the first operating indicator, the satisfied value output by the regulator is 1, and the switching frequency adjustment value is 0.

[0030] In a possible implementation, according to the satisfaction value, the switching frequency adjustment value and the wave transmission mode corresponding to each performance, a decision maker is used to determine a target switching frequency adjustment value from a plurality of switching frequency adjustment values, and to determine a target wave transmission mode from a plurality of wave transmission modes, including:

[0031] According to the satisfaction value corresponding to each performance, the switching frequency adjustment value and the wave generation mode, the decision maker is used to perform the following steps:

[0032] Sort multiple satisfaction values;

[0033] Determine the target switching frequency adjustment value and target wave generation mode corresponding to the minimum satisfaction value;

[0034] When there are multiple minimum satisfaction values, determine the performance with the highest priority among the multiple performances corresponding to the multiple minimum satisfaction values;

[0035] Determine the target switching frequency adjustment value and the target wave generation mode corresponding to the performance with the highest priority.

[0036] In a possible implementation, the target switching frequency adjustment value and the target wave transmission mode correspond to the target performance; and according to the target switching frequency adjustment value and the target wave transmission mode, the adjustment strategy of the decision maker is adopted to adjust the converter, including adopting the decision maker to perform the following steps:

[0037] According to the corresponding relationships between the minimum satisfaction value of the target performance and the response time and the hold time, the target response time and the target hold time corresponding to the minimum satisfaction value of the target performance are determined;

[0038] During the current holding time, determine whether to make adjustments based on preset judgment rules;

[0039] If adjustment is to be made, the timing is started, and after the timing time reaches the target response time, the converter is adjusted based on the target switching frequency adjustment value and the target wave generation mode;

[0040] After the current holding time, start timing, and after the timing time reaches the target response time, adjust the converter based on the target switching frequency adjustment value and the target wave generation mode;

[0041] After adjusting the current transformer, start timing and repeat the above steps based on the target hold time.

[0042] In a possible implementation, the preset judgment rules include:

[0043] Compare the current minimum satisfaction value with the minimum satisfaction value of the target performance; if the current minimum satisfaction value is greater than the minimum satisfaction value of the target performance, make adjustments; otherwise, do not make adjustments;

[0044] or,

[0045] Record the comprehensive performance evaluation value of the converter after each adjustment; compare the current comprehensive performance evaluation value with the comprehensive performance evaluation value before the last adjustment; if the current comprehensive performance evaluation value is less than the comprehensive performance evaluation value before the last adjustment, make an adjustment; otherwise, do not make an adjustment.

[0046] or,

[0047] Determine the current comprehensive performance evaluation value according to the satisfaction values ​​and weights corresponding to the current performance items; use the prediction model to predict the comprehensive performance evaluation value according to the operating information, the target switching frequency adjustment value and the target wave transmission mode; compare the current comprehensive performance evaluation value with the predicted comprehensive performance evaluation value; if the current comprehensive performance evaluation value is less than the predicted comprehensive performance evaluation value, make an adjustment; otherwise, do not make an adjustment.

[0048] In a possible implementation, the decision maker includes a prediction model, and the method further includes:

[0049] Determine the comprehensive performance evaluation value based on the satisfaction value and weight corresponding to each performance;

[0050] Using the prediction model, according to the operation information, the target switching frequency adjustment value and the target wave mode, the prediction value of each performance, the prediction value of each performance satisfaction and the prediction value of the comprehensive performance evaluation are output;

[0051] The adjuster and the decision maker are optimized according to the satisfaction value and the comprehensive performance evaluation value corresponding to each performance, as well as the prediction value of each performance, the satisfaction prediction value of each performance and the comprehensive performance evaluation prediction value.

[0052] An embodiment of the present invention provides a method for adjusting the switching frequency of an inverter. Based on the operating information of the inverter, the satisfaction value of each performance, the switching frequency adjustment value and the wave transmission mode are determined. The satisfaction value of each performance, the switching frequency adjustment value and the wave transmission mode are comprehensively considered to decide the final switching frequency adjustment value and the wave transmission mode to adjust the inverter and improve the comprehensive performance of the inverter. BRIEF DESCRIPTION OF THE DRAWINGS

[0053] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying creative work.

[0054] Figure 1 A schematic flow chart of a method for adjusting the switching frequency of a converter provided by an embodiment of the present invention;

[0055] Figure 2 A schematic flow chart of an adjustment method for an adjuster provided by an embodiment of the present invention;

[0056] Figure 3 A schematic diagram of the hardware structure of a converter provided in an embodiment of the present invention. DETAILED DESCRIPTION

[0057] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0058] The method provided in the embodiment of the present invention is performed by a converter.

[0059] Embodiment 1

[0060] The embodiment of the present invention provides a method for adjusting the switching frequency of a converter. Figure 1 As shown, the following steps may be included:

[0061] S110, obtaining operation information of the converter.

[0062] Monitor the operating information of the converter during operation.

[0063] In one embodiment, the operation information may include at least two of power command information, module information, cabinet environment information, harmonic information, midpoint ripple information, or converter operation status.

[0064] The power command information may include active power command input, reactive power command input, grid voltage, generator speed, etc.

[0065] The module information may include water temperature and / or ambient temperature, as well as current frequency, current amplitude, switching frequency, wave generation mode, module NTC temperature and DC bus voltage.

[0066] The cabinet environment information may include the temperature inside the converter cabinet, the humidity inside the cabinet, the module heat sink temperature, etc.

[0067] The harmonic information may include three-phase instantaneous current, three-phase instantaneous voltage, and the like.

[0068] The midpoint ripple information may include three-phase duty cycle, three-phase instantaneous current, bus capacitance value, etc.

[0069] The converter operation state may be a synchronous state, a grid-connected state or a fault ride-through state.

[0070] S120, according to the operation information, respectively using the index model corresponding to each of the multiple performances of the converter to determine the operation index corresponding to each performance.

[0071] An input module is used to input information related to each performance in the operation information into an index model corresponding to each performance, and the index model outputs an operation index corresponding to each performance.

[0072] The plurality of performances may include at least two of an overcurrent control performance, a module loss control performance, a module junction temperature control performance, a condensing temperature control performance, a harmonic content control performance, or a midpoint ripple control performance.

[0073] S130, according to the operation index corresponding to each performance, using the regulator corresponding to each performance to output the satisfaction value, switching frequency adjustment value and wave transmission mode corresponding to each performance, to obtain multiple satisfaction values, multiple switching frequency adjustment values ​​and multiple wave transmission modes.

[0074] The satisfaction value indicates the satisfaction degree of the operating indicator, and the value range is 0 to 1.0. When it is equal to 1.0, it means that the operating indicator fully meets the demand. When it is less than 1.0, the smaller the value, the worse the satisfaction degree of the operating indicator.

[0075] The wave generation mode corresponding to one performance is space vector pulse width modulation (SVPWM) or discrete pulse width modulation (DPWM).

[0076] S140, according to the satisfaction value, the switching frequency adjustment value and the wave generation mode corresponding to each performance, a decision maker is used to determine a target switching frequency adjustment value from a plurality of switching frequency adjustment values, and to determine a target wave generation mode from a plurality of wave generation modes.

[0077] The target switching frequency adjustment value is a switching frequency adjustment value to be finally adopted among the switching frequency adjustment values ​​corresponding to the various performances.

[0078] The target wave generation mode is a wave generation mode to be finally adopted among the wave generation modes corresponding to the various performances.

[0079] According to the satisfaction values ​​and switching frequency adjustment values ​​corresponding to each performance, the target switching frequency adjustment value and target wave generation mode with excellent comprehensive performance of the decision-maker converter are adopted.

[0080] S150, adjusting the converter using an adjustment strategy of a decision maker according to a target switching frequency adjustment value and a target wave generation mode.

[0081] According to the target switching frequency adjustment value and the target wave generation mode, the adjustment strategy of the decision maker is used to determine the adjustment time and adjust the converter.

[0082] The method for adjusting the switching frequency of a converter provided in an embodiment of the present invention determines the satisfaction values ​​of various performances, the switching frequency adjustment values ​​and the wave transmission mode based on the operating information of the converter, comprehensively considers the satisfaction values ​​of various performances, the switching frequency adjustment values ​​and the wave transmission mode, and decides on the final switching frequency adjustment value and the wave transmission mode to adjust the converter and improve the comprehensive performance of the converter.

[0083] Embodiment 2

[0084] In some embodiments, a regulator is used to determine the satisfaction value, the switching frequency adjustment value and the wave generation mode according to the operating parameters.

[0085] When the multiple performances also include converter state performance, the information related to the converter state performance in the operation information includes the converter operation state. In step S140: according to the satisfaction value and the switching frequency adjustment value corresponding to each performance, a decision maker is used to determine the target switching frequency adjustment value from the switching frequency adjustment values ​​corresponding to each performance, and before determining the target wave generation mode from the wave generation modes corresponding to each performance, the method may further include the following steps:

[0086] S160, according to the converter operation state in the operation information, using the regulator corresponding to the converter state performance, determining the satisfaction value, the switching frequency adjustment value and the wave generation mode corresponding to the converter operation state performance.

[0087] The method provided in the embodiment of the present invention targets the state performance of the converter, adopts a corresponding regulator, outputs a satisfaction value, a switching frequency adjustment value and a wave generation mode corresponding to the operating state performance of the converter, and provides a basis for the state performance of the converter to improve the comprehensive performance of the converter.

[0088] Embodiment 3

[0089] In some embodiments, when the multiple performances include an overcurrent control performance, the information related to the overcurrent control performance in the operation information includes: active power command input, reactive power command input, grid voltage, and generator speed.

[0090] S120: According to the operation information, respectively using the index model corresponding to each of the multiple performances of the converter to determine the operation index corresponding to each performance, which may include the following steps:

[0091] S121, according to the active command input, reactive command input, grid voltage and generator speed in the operation information, using a converter power model corresponding to the overcurrent control performance, to determine the operation current of the converter power module.

[0092] According to the operating scenario of the converter, the operating current of the power module under the operating condition is calculated using the converter power model according to the active command input, reactive command input, grid voltage and generator speed in the operating information.

[0093] The method provided in the embodiment of the present invention targets the overcurrent control performance of the converter, adopts the corresponding converter power model, outputs the operating current of the converter power module corresponding to the overcurrent control performance, and provides a basis for the overcurrent control performance to improve the comprehensive performance of the converter.

[0094] Embodiment 4

[0095] In some embodiments, when multiple performances include module loss control performance, the information related to the module loss control performance in the operating information includes water temperature and / or ambient temperature, as well as current frequency, current amplitude, switching frequency, wave generation mode, module NTC temperature and DC bus voltage.

[0096] S120: According to the operation information, respectively using the index model corresponding to each of the multiple performances of the converter to determine the operation index corresponding to each performance, which may include the following steps:

[0097] S122, according to the water temperature and / or ambient temperature in the operation information, as well as the current frequency, current amplitude, switching frequency, wave generation mode, module NTC temperature and DC bus voltage, a converter loss model corresponding to the module loss control performance is used to determine the loss.

[0098] According to the water temperature and / or ambient temperature in the operation information, as well as the current frequency, current amplitude, switching frequency, wave generation mode, module NTC temperature and DC bus voltage, the converter loss model is used to calculate the IGBT conduction loss, diode conduction loss, diode reverse recovery loss, IGBT switching loss, and the total loss and maximum loss. The average loss is calculated based on the total loss.

[0099] When the method provided in the embodiment of the present invention is aimed at the module loss control performance of the converter, the corresponding converter loss model is adopted to output the maximum loss and average loss corresponding to the module loss control performance, thereby providing a basis for the module loss control performance for improving the comprehensive performance of the converter.

[0100] Embodiment 5

[0101] In some embodiments, based on embodiment four, when multiple performances also include module junction temperature control performance, the information related to the module junction temperature control performance in the operating information includes water temperature or ambient temperature, current frequency, current amplitude, switching frequency, wave generation mode, module NTC temperature, DC bus voltage and loss.

[0102] S120: According to the operation information, respectively using the index model corresponding to each of the multiple performances of the converter to determine the operation index corresponding to each performance, which may also include the following steps:

[0103] S123, according to the water temperature or ambient temperature, current frequency, current amplitude, switching frequency, wave generation mode, module NTC temperature, DC bus voltage and loss in the operation information, a converter junction temperature model corresponding to the module junction temperature control performance is used to determine the junction temperature of the converter module.

[0104] Junction temperature includes maximum junction temperature, average junction temperature, and junction temperature fluctuation.

[0105] The converter junction temperature model has built-in module thermal resistance model parameters. The module thermal resistance model parameters can be obtained from the data sheet provided by the IGBT manufacturer, or through experimental methods.

[0106] According to the water temperature or ambient temperature, current frequency, current amplitude, switching frequency, wave generation mode, module NTC temperature, DC bus voltage and the above average loss and maximum loss in the operation information, calculate the maximum junction temperature, average junction temperature, junction temperature fluctuation and other indicators of the converter module IGBT and diode.

[0107] The method provided in the embodiment of the present invention adopts the corresponding converter loss model to output the maximum loss and average loss corresponding to the module loss control performance for the module loss control performance, and also outputs the maximum junction temperature, average junction temperature, and junction temperature fluctuation of the module junction temperature control performance based on the water temperature or ambient temperature, current frequency, current amplitude, switching frequency, wave generation mode, module NTC temperature, DC bus voltage, and the maximum loss and average loss corresponding to the module loss control performance for the module junction temperature control performance, so as to provide a basis for the module loss control performance and the module junction temperature control performance for improving the comprehensive performance of the converter.

[0108] Embodiment 6

[0109] In some embodiments, when the plurality of performances include the condensing temperature control performance, the information related to the condensing temperature control performance in the operation information includes the temperature inside the converter cabinet, the humidity inside the cabinet, and the module radiator temperature.

[0110] S120: According to the operation information, respectively using the index model corresponding to each of the multiple performances of the converter to determine the operation index corresponding to each performance, which may include the following steps:

[0111] S124, determining the condensation temperature by using a module condensation model corresponding to the module junction temperature control performance according to the temperature inside the converter cabinet, the humidity inside the cabinet, and the module radiator temperature in the operation information.

[0112] The module condensation model has a built-in saturated water vapor pressure calculation formula. Based on the temperature inside the converter cabinet, the humidity inside the cabinet, and the module radiator temperature, the module condensation model is used to calculate the condensation temperature of the module radiator. When the radiator temperature is lower than the condensation temperature of the module radiator, the module is at risk of condensation.

[0113] When the method provided in the embodiment of the present invention is aimed at the condensing temperature control performance of the inverter, the corresponding module condensation model is adopted to output the condensing temperature of the module radiator corresponding to the condensing temperature control performance, thereby providing a basis for the condensing temperature control performance for improving the comprehensive performance of the inverter.

[0114] Embodiment 7

[0115] In some embodiments, when the plurality of performances include a harmonic content control performance, the information related to the harmonic content control performance in the operation information includes three-phase instantaneous current and three-phase instantaneous voltage.

[0116] S120: According to the operation information, respectively using the index model corresponding to each of the multiple performances of the converter to determine the operation index corresponding to each performance, which may include the following steps:

[0117] S125, determining the harmonic content according to the three-phase instantaneous current and the three-phase instantaneous voltage in the operation information by using a harmonic analysis model corresponding to the harmonic content control performance.

[0118] The harmonic content includes the grid voltage harmonic content, module current harmonic content and capacitor harmonic content.

[0119] The harmonic analysis model is used to perform Fourier analysis on the three-phase instantaneous current and three-phase instantaneous voltage respectively to obtain the harmonic content of the grid voltage, the harmonic content of the module current and the harmonic content of the capacitor.

[0120] When the method provided in an embodiment of the present invention is aimed at the harmonic content control performance of the converter, a harmonic analysis model corresponding to the harmonic content control performance is adopted to output the grid voltage harmonic content, module current harmonic content and capacitor harmonic content corresponding to the harmonic content control performance, thereby providing a basis for the harmonic content control performance for improving the comprehensive performance of the converter.

[0121] Embodiment 8

[0122] In some embodiments, when the plurality of performances include a midpoint ripple control performance, the information related to the midpoint ripple control performance in the operation information includes three-phase duty cycle, three-phase instantaneous current and bus capacitance value.

[0123] S120: According to the operation information, respectively using the index model corresponding to each of the multiple performances of the converter to determine the operation index corresponding to each performance, which may include the following steps:

[0124] S121, according to the three-phase duty cycle, three-phase instantaneous current and bus capacitance value in the operation information, a ripple analysis model corresponding to the midpoint ripple control performance is adopted to determine the midpoint ripple voltage peak value.

[0125] The three-phase duty cycle w a ,w b ,w c With three-phase current I a ,I b ,I c After multiplication and addition, the average current flowing out of the neutral point in one switching cycle of the three-level is obtained.

[0126]

[0127] Then according to the bus capacitance value C dc Calculate the midpoint voltage ripple current charging slope Finally, according to the action time t of each voltage vector in a switching cycle vi , calculate the midpoint voltage fluctuation caused by this vector There are 6 voltage vectors in each switching cycle, and the midpoint voltage ripple peak value V is finally calculated. npmax .

[0128] When the method provided in the embodiment of the present invention is aimed at the midpoint ripple control performance, a corresponding harmonic analysis model is adopted to output the midpoint ripple voltage peak value corresponding to the midpoint ripple control performance, thereby providing a basis for the midpoint ripple control performance for improving the comprehensive performance of the converter.

[0129] Embodiment 9

[0130] In some embodiments, S130: according to the operating index corresponding to each performance, using the regulator corresponding to each performance to output the satisfaction value, the switching frequency adjustment value and the wave generation mode corresponding to each performance, may include the following steps:

[0131] S131, when the first operating indicator is greater than a preset maximum value of the first operating indicator, using an adjuster to determine a target operating indicator range satisfied by the first operating indicator according to a plurality of operating indicator ranges corresponding to the first operating indicator.

[0132] The first operating indicator represents any operating indicator among the operating indicators corresponding to each performance.

[0133] The regulator can be implemented by table lookup, step regulation, hysteresis comparator, PI controller, neural network and other methods.

[0134] Preset the preset maximum value of each operating indicator and multiple operating indicator ranges corresponding to each operating indicator. Each operating indicator range corresponds to a satisfaction value, a switching frequency adjustment value and a wave generation mode. More precise adjustment of the converter.

[0135] When the first operating index is greater than a preset maximum value of the first operating index, the satisfaction value is less than 1.0, and the switching frequency adjustment value and the wave generation mode are determined according to the degree to which the first operating index is greater than the preset maximum value of the first operating index.

[0136] S134, using a regulator to determine the satisfaction value, the switching frequency adjustment value and the wave generation mode according to the correspondence between the target operation index range and the satisfaction value, the switching frequency adjustment value and the wave generation mode.

[0137] In one embodiment, the regulator can be implemented by a hysteresis comparator. Taking the module junction temperature control performance as an example, the operating indicators output by the converter junction temperature model include the highest junction temperature, the average junction temperature, and the junction temperature fluctuation. For the highest junction temperature, a preset maximum value of the highest junction temperature is pre-set, as well as three operating indicator ranges of "greater than junction temperature 1", "less than or equal to junction temperature 1 and greater than junction temperature 2", and "less than or equal to junction temperature 2". The corresponding satisfied value for "greater than junction temperature 1" is set to A1, the output switching frequency adjustment value B1, and the wave transmission mode C1; the corresponding satisfied value for "less than or equal to junction temperature 1 and greater than junction temperature 2" is set to A2, the output switching frequency adjustment value B2, and the wave transmission mode C2; ​​the corresponding satisfied value for "less than or equal to junction temperature 2" is set to A3, the output switching frequency adjustment value A3, and the wave transmission mode C3.

[0138] When the maximum junction temperature is greater than the preset maximum value of the maximum junction temperature, such as Figure 2 As shown, compare the maximum junction temperature with junction temperature 1. If the maximum junction temperature is greater than junction temperature 1, the satisfied value is set to A1, the output switching frequency adjustment value is B1, and the wave transmission mode is C1; if the maximum junction temperature is less than or equal to junction temperature 1 and greater than junction temperature 2, the satisfied value is set to A2, the output switching frequency adjustment value is B2, and the wave transmission mode is C2; if the maximum junction temperature is less than or equal to junction temperature 2, the satisfied value is set to A3, the output switching frequency adjustment value is A3, and the wave transmission mode is C3.

[0139] S133, when the first operating indicator is less than or equal to the preset maximum value of the first operating indicator, the satisfied value output by the regulator is adopted as 1, and the switching frequency adjustment value is 0.

[0140] In the method provided by the embodiment of the present invention, when the first operating indicator is greater than the preset maximum value of the first operating indicator, it indicates that the corresponding performance needs to be improved. The preset maximum value of each operating indicator and multiple operating indicator ranges corresponding to each operating indicator are preset, and each operating indicator range corresponds to a satisfaction value, a switching frequency adjustment value and a wave transmission mode. Based on the operating indicator range to which the first operating indicator belongs, the switching frequency adjustment value and the wave transmission mode are adjusted to more finely adjust the converter.

[0141] Embodiment 10

[0142] In some embodiments, S140: according to the satisfaction value, the switching frequency adjustment value and the wave generation mode corresponding to each performance, using a decision maker to determine a target switching frequency adjustment value from a plurality of switching frequency adjustment values, and determining a target wave generation mode from a plurality of wave generation modes, may include the following steps:

[0143] According to the satisfaction value corresponding to each performance, the switching frequency adjustment value and the wave generation mode, the decision maker is used to perform the following steps:

[0144] S141, sorting multiple satisfied values.

[0145] S142, determining a target switching frequency adjustment value and a target wave generation mode corresponding to the minimum satisfaction value.

[0146] The lower the satisfaction value is, the worse the performance corresponding to the satisfaction value is, and the stronger the urgency of improving the performance is. The switching frequency adjustment value and wave transmission mode corresponding to the performance are used as the corresponding target switching frequency adjustment value and target wave transmission mode, and the performance is improved first.

[0147] S143: When there are multiple minimum satisfaction values, determine the performance with the highest priority among the multiple performances corresponding to the multiple minimum satisfaction values.

[0148] S144, determining a target switching frequency adjustment value and a target wave transmission mode corresponding to the performance with the highest priority.

[0149] The method provided in the embodiment of the present invention selects a target switching frequency adjustment value and a target wave transmission mode based on the urgency of improving each performance and the priority of the performance, and improves the overall performance by first improving the poorer performance.

[0150] Embodiment 11

[0151] In some embodiments, the target switching frequency adjustment value and the target wave generation mode correspond to the target performance; S150: according to the target switching frequency adjustment value and the target wave generation mode, the adjustment strategy of the decision maker is adopted to adjust the converter, which may include adopting the decision maker to perform the following steps:

[0152] S151, according to the corresponding relationship between the minimum satisfaction value of the target performance and the response time and the retention time, determine the target response time and the target retention time corresponding to the minimum satisfaction value of the target performance.

[0153] The decision maker sets the corresponding relationship between the satisfaction value of each performance and the response time and hold time. The time parameter and hold time can be set to multiple levels. A low satisfaction value corresponds to a shorter response time and hold time, and a high satisfaction value corresponds to a longer response time and hold time. Find the target response time and target hold time corresponding to the minimum satisfaction value of the target performance.

[0154] S152: During the current holding time, determine whether to make an adjustment according to a preset determination rule.

[0155] After the last adjustment, there is a corresponding holding time. If a request for adjustment based on the target switching frequency adjustment value and the target wave transmission mode is generated during the current holding time, it is first determined whether the adjustment request is immediately satisfied according to a preset judgment rule.

[0156] S153, if adjustment is to be made, then start timing, and after the timing time reaches the target response time, adjust the converter based on the target switching frequency adjustment value and the target wave generation mode.

[0157] If no adjustment is made, the current switching frequency adjustment value and wave generation mode are maintained until the currently used holding time is reached.

[0158] S154, starting timing outside the current holding time, and adjusting the converter based on the target switching frequency adjustment value and the target wave generation mode after the timing time reaches the target response time.

[0159] If a request for adjustment based on the target switching frequency adjustment value and the target wave transmission mode is generated outside the current holding time, the adjustment request is immediately satisfied and timing is started. After the timing time reaches the target response time, the converter is adjusted based on the target switching frequency adjustment value and the target wave transmission mode.

[0160] S155, after adjusting the converter, start timing, and repeat the above steps based on the target holding time.

[0161] The converter is adjusted based on the target switching frequency adjustment value and the target wave generation mode, and timing starts. If a new adjustment request is generated within the target holding time, whether the adjustment request should be met immediately is first determined based on the preset judgment rules; if a new adjustment request is generated outside the target holding time, the adjustment request is immediately met and timing starts. After the timing reaches the new target response time, the converter is adjusted.

[0162] The method provided in the embodiment of the present invention determines the time to adjust the converter, thereby avoiding the deterioration of the comprehensive performance caused by frequent adjustment of the converter.

[0163] Embodiment 12

[0164] In some embodiments, the preset judgment rule used in S152 of the eleventh embodiment may include:

[0165] Compare the current minimum satisfaction value with the minimum satisfaction value of the target performance; if the current minimum satisfaction value is greater than the minimum satisfaction value of the target performance, make adjustments; otherwise, do not make adjustments.

[0166] If a request for adjustment based on the target switching frequency adjustment value and the target wave generation mode is generated within the current holding time, when the current minimum satisfaction value is greater than the minimum satisfaction value of the target performance, it means that the performance corresponding to the current switching frequency adjustment value and the wave generation mode is more satisfactory than the target performance, and satisfying the target performance can better improve the overall performance; when the current minimum satisfaction value is less than or equal to the minimum satisfaction value of the target performance, it means that the performance corresponding to the current switching frequency adjustment value and the wave generation mode is less satisfactory than the target performance, and maintaining the current switching frequency adjustment value and the wave generation mode can better improve the overall performance.

[0167] The method provided in the embodiment of the present invention determines the timing of adjusting the converter and improves the overall performance based on the performance corresponding to the current switching frequency adjustment value and the wave generation mode and the degree of satisfaction of the target performance.

[0168] Embodiment 13

[0169] In some embodiments, the preset judgment rule used in S152 of the eleventh embodiment may include:

[0170] Record the comprehensive performance evaluation value of the converter after each adjustment; compare the current comprehensive performance evaluation value with the comprehensive performance evaluation value before the last adjustment; if the current comprehensive performance evaluation value is less than the comprehensive performance evaluation value before the last adjustment, make an adjustment; otherwise, do not make an adjustment.

[0171] The decision maker records the comprehensive performance evaluation value of the converter after each adjustment of the converter. If a request for adjustment based on the target switching frequency adjustment value and the target wave transmission mode is generated within the current holding time, and the current comprehensive performance evaluation value is less than the comprehensive performance evaluation value before the last adjustment, it means that after the last adjustment, the current switching frequency adjustment value and wave transmission mode have deteriorated the comprehensive performance of the converter, so the converter is adjusted in advance.

[0172] The method provided in the embodiment of the present invention uses the current comprehensive performance evaluation value and the comprehensive performance evaluation value before the last adjustment to determine the timing of adjusting the converter and improve the comprehensive performance.

[0173] Embodiment 14

[0174] In some embodiments, the preset judgment rule used in S152 of the eleventh embodiment may include:

[0175] Determine the current comprehensive performance evaluation value according to the satisfaction values ​​and weights corresponding to the current performance items; use the prediction model to predict the comprehensive performance evaluation value according to the operating information, the target switching frequency adjustment value and the target wave transmission mode; compare the current comprehensive performance evaluation value with the predicted comprehensive performance evaluation value; if the current comprehensive performance evaluation value is less than the predicted comprehensive performance evaluation value, make an adjustment; otherwise, do not make an adjustment.

[0176] According to the satisfaction values ​​and weights corresponding to the current performance, the current comprehensive performance evaluation value is calculated using the following formula:

[0177]

[0178] Among them, S i represents the satisfaction value of the i-th performance, w pi Indicates the weight of the i-th performance. If a request based on the target switching frequency adjustment value and the target wave generation mode adjustment is generated during the current hold time, and the current comprehensive performance evaluation value is less than the predicted comprehensive performance evaluation value, it means that after the adjustment based on the target switching frequency adjustment value and the target wave generation mode, the comprehensive performance of the converter is expected to be improved, so the converter is adjusted in advance.

[0179] The method provided in the embodiment of the present invention uses the current comprehensive performance evaluation value and the predicted comprehensive performance evaluation value to determine the timing of adjusting the converter and improve the comprehensive performance.

[0180] Embodiment 15

[0181] In some embodiments, the decision maker includes a prediction model, and the method further includes the following steps:

[0182] S170, determining a comprehensive performance evaluation value according to the satisfaction value and weight corresponding to each performance.

[0183] According to the satisfaction values ​​and weights corresponding to the current performance, the current comprehensive performance evaluation value is calculated using the following formula:

[0184]

[0185] Among them, S i represents the satisfaction value of the i-th performance, w pi Represents the weight of the i-th performance.

[0186] S180, using a prediction model, outputting various performance prediction values, various performance satisfaction prediction values ​​and comprehensive performance evaluation prediction values ​​according to the operation information, the target switching frequency adjustment value and the target wave transmission mode.

[0187] First, the data generated during the operation of the converter is recorded to obtain a database for training. Data under various operating conditions are obtained to improve the database based on the operating database. The input data includes operating data, adjustment values ​​and wave generation methods, and the output data includes various performance values, satisfaction values, and comprehensive performance evaluation values. Using machine learning algorithms, based on operating data, the mathematical relationship between input data and output data is trained. The multi-layer BP neural network model can be used for training to obtain the weights, biases and other parameters of the neural network neurons. The prediction accuracy of the neural network is verified to obtain a satisfactory prediction model.

[0188] The operation information, target switching frequency adjustment value and target wave generation mode are input into the prediction model, and the prediction model outputs the prediction value of each performance, the prediction value of each performance satisfaction and the prediction value of the comprehensive performance evaluation.

[0189] S190, optimizing the adjuster and the decision maker according to the satisfaction value and the comprehensive performance evaluation value corresponding to each performance, as well as the prediction value of each performance, the satisfaction prediction value of each performance and the comprehensive performance evaluation prediction value.

[0190] The satisfaction value and comprehensive performance evaluation value corresponding to each performance, as well as the predicted value of each performance, the predicted value of each performance satisfaction and the predicted value of the comprehensive performance evaluation are used as feedback for the optimization adjuster and the decision maker to optimize the adjuster and the decision maker.

[0191] The method provided by the embodiment of the present invention optimizes the regulator and the decision maker, further improves the accuracy, and more effectively improves the overall performance of the converter.

[0192] Embodiment 16

[0193] Another embodiment of the present invention further provides a converter, see Figure 3 As shown, the converter comprises:

[0194] Memory 300 and processor 310;

[0195] The memory 300 is connected to the processor 310 and is used to store programs;

[0196] The processor 310 is used to implement the converter switching frequency adjustment method disclosed in any of the above embodiments by running the program stored in the memory 300.

[0197] Specifically, the converter may further include: a bus, a communication interface 320 , an input device 330 and an output device 340 .

[0198] The processor 310, the memory 300, the communication interface 320, the input device 330 and the output device 340 are connected to each other via a bus.

[0199] A bus may include a pathway that transfers information between components of a computer system.

[0200] The processor 310 may be a general-purpose processor, such as a general-purpose central processing unit (CPU), a microprocessor, etc., or an application-specific integrated circuit (ASIC), or one or more integrated circuits for controlling the execution of the program of the scheme of the present invention. It may also be a digital signal processor (DSP), an application-specific integrated circuit (ASIC), a field programmable gate array (FPGA) or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components.

[0201] The processor 310 may include a main processor, and may also include a baseband chip, a modem, and the like.

[0202] The memory 300 stores a program for executing the technical solution of the present invention, and may also store an operating system and other key services. Specifically, the program may include a program code, and the program code includes a computer operation instruction. More specifically, the memory 300 may include a read-only memory (ROM), other types of static storage devices that can store static information and instructions, a random access memory (RAM), other types of dynamic storage devices that can store information and instructions, a disk storage, a flash, and the like.

[0203] The input device 330 may include a device for receiving data and information input by a user, such as a keyboard, a mouse, a camera, a scanner, a voice input device, a touch screen, etc.

[0204] Output device 340 may include devices that allow information to be output to a user, such as a display screen, printer, speaker, etc.

[0205] The communication interface 320 may include any transceiver or the like to communicate with other devices or communication networks, such as Ethernet, Radio Access Network (RAN), Wireless Local Area Network (WLAN), etc.

[0206] The processor 310 executes the program stored in the memory 300 and calls other devices, and can be used to implement each step of any converter switching frequency adjustment method provided by the above embodiments of the present invention.

[0207] Embodiment 17

[0208] In addition, an embodiment of the present invention may also be a storage medium on which computer program instructions are stored, and the computer program instructions are executed by a processor to execute the steps of the converter switching frequency adjustment method of various embodiments of the present invention described above in this specification.

[0209] Embodiment 18

[0210] An embodiment of the present invention provides a computer program product, which includes computer program instructions. When the instructions in the computer program product are executed by a processor of an electronic device, the electronic device executes the steps of the converter switching frequency adjustment method of the various embodiments of the present invention described above in this specification.

[0211] The computer program product may be written in any combination of one or more programming languages ​​to write program code for performing the operations of the embodiments of the present invention, including object-oriented programming languages ​​such as Java, C++, etc., and conventional procedural programming languages ​​such as "C" or similar programming languages. The program code may be executed entirely on the user computing device, partially on the user device, as a separate software package, partially on the user computing device and partially on a remote computing device, or entirely on a remote computing device or server.

[0212] For the above-mentioned method embodiments, for the sake of simplicity, they are all described as a series of action combinations, but those skilled in the art should know that the present invention is not limited by the order of the actions described, because according to the present invention, some steps can be performed in other orders or simultaneously. Secondly, those skilled in the art should also know that the embodiments described in the specification are all preferred embodiments, and the actions and modules involved are not necessarily required by the present invention.

[0213] It should be noted that each embodiment in this specification is described in a progressive manner, and each embodiment focuses on the differences from other embodiments, and the same or similar parts between the embodiments can be referred to each other. For the device embodiment, since it is basically similar to the method embodiment, the description is relatively simple, and the relevant parts can be referred to the partial description of the method embodiment.

[0214] The steps in the methods of the embodiments of the present invention may be adjusted in order, combined, or deleted according to actual needs, and the technical features recorded in the embodiments may be replaced or combined.

[0215] The modules and sub-modules in the devices and terminals of the various embodiments of the present invention may be combined, divided, or deleted according to actual needs.

[0216] In the several embodiments provided by the present invention, it should be understood that the disclosed terminals, devices and methods can be implemented in other ways. For example, the terminal embodiments described above are only schematic, for example, the division of modules or submodules is only a logical function division, and there may be other division methods in actual implementation, such as multiple submodules or modules can be combined or integrated into another module, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be an indirect coupling or communication connection through some interfaces, devices or modules, which can be electrical, mechanical or other forms.

[0217] The modules or submodules described as separate components may or may not be physically separated, and the components of the modules or submodules may or may not be physical modules or submodules, that is, they may be located in one place, or they may be distributed on multiple network modules or submodules. Some or all of the modules or submodules may be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0218] In addition, each functional module or submodule in each embodiment of the present invention may be integrated into one processing module, or each module or submodule may exist physically separately, or two or more modules or submodules may be integrated into one module. The above-mentioned integrated modules or submodules may be implemented in the form of hardware or in the form of software functional modules or submodules.

[0219] Professionals may further appreciate that the units and algorithm steps of each example described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, computer software, or a combination of the two. In order to clearly illustrate the interchangeability of hardware and software, the composition and steps of each example have been generally described in the above description according to function. Whether these functions are performed in hardware or software depends on the specific application and design constraints of the technical solution. Professionals and technicians may use different methods to implement the described functions for each specific application, but such implementation should not be considered to be beyond the scope of the present invention.

[0220] The steps of the method or algorithm described in conjunction with the embodiments disclosed herein may be implemented directly by hardware, software units executed by a processor, or a combination of the two. The software units may be placed in a random access memory (RAM), a memory, a read-only memory (ROM), an electrically programmable ROM, an electrically erasable programmable ROM, a register, a hard disk, a removable disk, a CD-ROM, or any other form of storage medium known in the art.

[0221] Finally, it should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the presence of other identical elements in the process, method, article or device including the elements.

[0222] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but rather to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A method for adjusting the switching frequency of a converter, It is characterized in that Applied to a converter, the method comprises: Acquiring operation information of the converter; According to the operation information, respectively using an index model corresponding to each of the multiple performances of the converter to determine an operation index corresponding to each performance; According to the operation index corresponding to each performance, the regulator corresponding to each performance is used to output the satisfaction value, the switching frequency adjustment value and the wave generation mode corresponding to each performance, so as to obtain multiple satisfaction values, multiple switching frequency adjustment values ​​and multiple wave generation modes; According to the satisfaction value, the switching frequency adjustment value and the wave transmission mode corresponding to each performance, a decision maker is used to determine a target switching frequency adjustment value from a plurality of switching frequency adjustment values, and to determine a target wave transmission mode from a plurality of wave transmission modes; According to the target switching frequency adjustment value and the target wave generation mode, an adjustment strategy of a decision maker is adopted to adjust the converter.

2. The method according to claim 1, It is characterized in that Before determining the target switching frequency adjustment value from a plurality of switching frequency adjustment values ​​and determining the target wave generation mode from a plurality of wave generation modes using a decision maker according to the satisfaction value, the switching frequency adjustment value and the wave generation mode corresponding to each performance, the method further includes: According to the converter operation state in the operation information, a regulator corresponding to the converter state performance is adopted to determine a satisfaction value, a switching frequency adjustment value and a wave generation mode corresponding to the converter operation state performance.

3. The method according to claim 1 or 2, It is characterized in that When the multiple performances include an overcurrent control performance, the step of using the index model corresponding to each performance of the multiple performances of the converter according to the operation information to determine the operation index corresponding to each performance includes: According to the active command input, reactive command input, grid voltage and generator speed in the operation information, a converter power model corresponding to the overcurrent control performance is adopted to determine the operation current of the converter power module.

4. The method according to claim 1 or 2, It is characterized in that When the multiple performances include module loss control performance, the step of using the index model corresponding to each performance of the multiple performances of the converter according to the operation information to determine the operation index corresponding to each performance includes: According to the water temperature or ambient temperature, current frequency, current amplitude, switching frequency, wave generation mode, module thermistor NTC temperature and DC bus voltage in the operation information, the loss is determined by using a converter loss model corresponding to the module loss control performance.

5. The method according to claim 4, It is characterized in that When the multiple performances further include module junction temperature control performance, the step of using the index model corresponding to each performance of the multiple performances of the converter respectively according to the operation information to determine the operation index corresponding to each performance further includes: According to the water temperature and / or ambient temperature in the operation information, as well as the current frequency, current amplitude, switching frequency, wave generation mode, module NTC temperature, DC bus voltage and the loss, a converter junction temperature model corresponding to the module junction temperature control performance is adopted to determine the junction temperature of the converter module.

6. The method according to claim 1 or 2, It is characterized in that When the multiple performances include condensing temperature control performance, the step of using the index model corresponding to each performance of the multiple performances of the converter according to the operation information to determine the operation index corresponding to each performance includes: According to the temperature inside the converter cabinet, the humidity inside the cabinet and the module radiator temperature in the operation information, a module condensation model corresponding to the module junction temperature control performance is used to determine the condensation temperature.

7. The method according to claim 1 or 2, It is characterized in that When the multiple performances include harmonic content control performance, the step of using the index model corresponding to each performance of the multiple performances of the converter according to the operation information to determine the operation index corresponding to each performance includes: According to the three-phase instantaneous current and the three-phase instantaneous voltage in the operation information, a harmonic content is determined by using a harmonic analysis model corresponding to the harmonic content control performance.

8. The method according to claim 1 or 2, It is characterized in that When the multiple performances include midpoint ripple control performance, the step of using the index model corresponding to each performance of the multiple performances of the converter according to the operation information to determine the operation index corresponding to each performance includes: According to the three-phase duty cycle, the three-phase instantaneous current and the bus capacitance value in the operation information, a ripple analysis model corresponding to the midpoint ripple control performance is adopted to determine the midpoint ripple voltage peak value.

9. The method according to claim 1 or 2, It is characterized in that The method of using a regulator to determine the satisfaction value, switching frequency adjustment value and wave generation mode corresponding to each performance according to the operating index corresponding to each performance includes: When the first operating indicator is greater than a preset maximum value of the first operating indicator, an adjuster is used to determine a target operating indicator range satisfied by the first operating indicator according to a plurality of operating indicator ranges corresponding to the first operating indicator; wherein the first operating indicator represents any operating indicator among the operating indicators corresponding to each performance; Adopting an adjuster to determine the satisfaction value, the switching frequency adjustment value and the wave generation mode according to the correspondence between the target operation index range and the satisfaction value, the switching frequency adjustment value and the wave generation mode; When the first operating indicator is less than or equal to the preset maximum value of the first operating indicator, the satisfied value output by the regulator is 1, and the switching frequency adjustment value is 0.

10. The method according to claim 1, It is characterized in that The method of using a decision maker to determine a target switching frequency adjustment value from a plurality of switching frequency adjustment values ​​and a target wave generation mode from a plurality of wave generation modes according to the satisfaction value, the switching frequency adjustment value and the wave generation mode corresponding to each performance includes: According to the satisfaction value corresponding to each performance, the switching frequency adjustment value and the wave generation mode, the decision maker is used to perform the following steps: Sort multiple satisfaction values; Determine the target switching frequency adjustment value and target wave generation mode corresponding to the minimum satisfaction value; When there are multiple minimum satisfaction values, determine the performance with the highest priority among the multiple performances corresponding to the multiple minimum satisfaction values; Determine a target switching frequency adjustment value and a target wave generation mode corresponding to the performance with the highest priority.

11. The method according to claim 10, It is characterized in that The target switching frequency adjustment value and the target wave generation mode correspond to target performance; and the adjusting strategy of the decision maker is used to adjust the converter according to the target switching frequency adjustment value and the target wave generation mode, including using the decision maker to perform the following steps: Determine the target response time and the target retention time corresponding to the minimum satisfaction value of the target performance according to the corresponding relationship between the minimum satisfaction value of the target performance and the response time and the retention time; During the current holding time, determine whether to make adjustments based on preset judgment rules; If adjustment is to be made, timing is started, and after the timing time reaches the target response time, the converter is adjusted based on the target switching frequency adjustment value and the target wave generation mode; Starting timing outside the current holding time, and adjusting the converter based on the target switching frequency adjustment value and the target wave generation mode after the timing time reaches the target response time; After adjusting the converter, the timing is started, and the above steps are repeated based on the target holding time.

12. The method according to claim 11, It is characterized in that The preset judgment rules include: Compare the current minimum satisfaction value with the minimum satisfaction value of the target performance; if the current minimum satisfaction value is greater than the minimum satisfaction value of the target performance, make an adjustment; otherwise, do not make an adjustment; or, Record the comprehensive performance evaluation value of the converter after each adjustment; compare the current comprehensive performance evaluation value with the comprehensive performance evaluation value before the last adjustment; if the current comprehensive performance evaluation value is less than the comprehensive performance evaluation value before the last adjustment, make an adjustment; otherwise, do not make an adjustment; or, Determine the current comprehensive performance evaluation value according to the satisfaction values ​​and weights corresponding to the current various performances; use the prediction model to predict the comprehensive performance evaluation value according to the operating information, the target switching frequency adjustment value and the target wave transmission mode; compare the current comprehensive performance evaluation value with the predicted comprehensive performance evaluation value; if the current comprehensive performance evaluation value is less than the predicted comprehensive performance evaluation value, make an adjustment; otherwise, do not make an adjustment.

13. The method according to claim 1, It is characterized in that The decision maker includes a prediction model, and the method further includes: Determine the comprehensive performance evaluation value based on the satisfaction value and weight corresponding to each performance; The prediction model is used to output various performance prediction values, various performance satisfaction prediction values ​​and comprehensive performance evaluation prediction values ​​according to the operation information, the target switching frequency adjustment value and the target wave generation mode; The adjuster and the decision maker are optimized according to the satisfaction values ​​corresponding to each performance and the comprehensive performance evaluation value, as well as the predicted values ​​of each performance, the satisfaction predicted values ​​of each performance and the predicted value of the comprehensive performance evaluation.

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