Inverter data processing method, device, equipment and storage medium

Abstract

The present invention discloses an inverter data processing method, device, equipment, and storage medium. The method includes: obtaining loss parameters of power switching devices in an inverter system and the saturation conduction voltage drop of the power switching devices; calculating the system loss of the inverter system based on the loss parameters, the saturation conduction voltage drop, and the number of the power switching devices; constructing a load equivalent model of the load motor based on a three-phase inductance equivalent model, a three-phase mutual inductance equivalent model, and a three-phase resistance equivalent model of the load motor in the inverter system; constructing a system simulation model of the inverter system based on the power switching devices, the loss parameters, the switching losses, and the load equivalent model; and running the system simulation model based on a fixed modulation wave frequency to determine the inverter efficiency. Through the above scheme, the calculation speed of the inverter output efficiency can be improved and the calculation cost can be reduced.

Description

Technical Field

[0001] Embodiments of the present invention relate to the field of computers, and in particular to an inverter data processing method, apparatus, device, and storage medium. Background Art

[0002] With the rise of electric vehicles, the energy consumption of electric vehicle inverters has become a key concern. Current methods for evaluating inverter efficiency rely primarily on physical prototypes, which are tested to determine inverter efficiency. This approach results in long evaluation cycles and high costs. Therefore, improving the calculation speed of inverter output efficiency and reducing the cost are key challenges. Summary of the Invention

[0003] The present invention provides an inverter data processing method, device, equipment and storage medium, which can improve the calculation speed of the inverter output efficiency and reduce the calculation cost.

[0004] According to one aspect of the present invention, there is provided a method for processing inverter data, comprising:

[0005] Obtaining loss parameters of a power switching device in an inverter system and a saturation conduction voltage drop of the power switching device; wherein the loss parameters include an operating junction temperature, a collector current, a collector-emitter voltage, a reverse recovery loss, a turn-off loss, and a turn-on loss of the power switching device;

[0006] Calculating the system loss of the inverter system according to the loss parameter, the saturation conduction voltage drop, and the number of the power switching devices;

[0007] Constructing a load equivalent model of the load motor according to a three-phase inductance equivalent model, a three-phase mutual inductance equivalent model, and a three-phase resistance equivalent model of the load motor in the inverter system;

[0008] Constructing a system simulation model of the inverter system based on the power switching device, the loss parameter, the system loss and the load equivalent model;

[0009] Based on a fixed modulation wave frequency, running the system simulation model to determine the inverter efficiency;

[0010] According to another aspect of the present invention, there is provided an inverter data processing device, the device comprising:

[0011] A loss parameter acquisition module, configured to acquire loss parameters of a power switch device in an inverter system and a saturation conduction voltage drop of the power switch device; wherein the loss parameters include an operating junction temperature, a collector current, a collector-emitter current, a diode reverse recovery loss, an IGBT turn-off loss, and a turn-on loss of the power switch device;

[0012] a system loss calculation module, configured to calculate the system loss of the inverter system according to the loss parameter, the saturation conduction voltage drop, and the number of the power switching devices;

[0013] a load equivalent model determination module, configured to construct a load equivalent model of the load motor according to a three-phase inductance equivalent model, a three-phase mutual inductance equivalent model, and a three-phase resistance equivalent model of the load motor in the inverter system;

[0014] a system simulation model building module, configured to build a system simulation model of the inverter system based on the power switching device, the loss parameter, the system loss and the load equivalent model;

[0015] The power conversion efficiency determination module is used to run the system simulation model based on a fixed modulation wave frequency to determine the inverter efficiency.

[0016] According to another aspect of the present invention, an electronic device is provided, comprising:

[0017] at least one processor; and

[0018] a memory communicatively connected to the at least one processor; wherein,

[0019] The memory stores a computer program executable by the at least one processor. The computer program is executed by the at least one processor so that the at least one processor can execute the inverter data processing method according to any embodiment of the present invention.

[0020] According to another aspect of the present invention, a computer-readable storage medium is provided, wherein the computer-readable storage medium stores computer instructions, and the computer instructions are used to enable a processor to implement the inverter data processing method according to any embodiment of the present invention when executed.

[0021] The technical solution of the embodiment of the present invention obtains the loss parameters of the power switching devices and the saturated conduction voltage drop of the power switching devices in the inverter system; calculates the system loss of the inverter system based on the loss parameters, the saturated conduction voltage drop and the number of power switching devices; constructs the load equivalent model of the load motor based on the three-phase inductance equivalent model, the three-phase mutual inductance equivalent model and the three-phase resistance equivalent model of the load motor in the inverter system; constructs the system simulation model of the inverter system based on the power switching devices, the loss parameters, the system loss and the load equivalent model; runs the system simulation model based on a fixed modulation wave frequency to determine the inverter efficiency. The above solution provides a method for constructing a system simulation model of the inverter system based on the system loss of the inverter system and the load equivalent model of the load motor, so as to determine the inverter efficiency based on the system simulation model. It solves the problem of low output efficiency calculation speed and high calculation cost caused by directly testing the output efficiency of the physical sample of the inverter system to obtain the output efficiency of the inverter system. A system simulation model of the inverter system is constructed based on the loss parameters of the inverter system's power switching devices and the load equivalent model of the load motor. Simulation experiments are then conducted based on this system simulation model to obtain the inverter efficiency. This allows for the construction of an accurate simulation model of the inverter system, while also improving the speed of inverter efficiency calculation and reducing the cost of power conversion efficiency calculations. The inverter system can also be evaluated based on the inverter efficiency, improving the efficiency of inverter system evaluation.

[0022] It should be understood that the content described in this section is not intended to identify the key or important features of the embodiments of the present invention, nor is it intended to limit the scope of the present invention. Other features of the present invention will become readily understood through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0024] Figure 1 A flowchart of an inverter data processing method provided in Embodiment 1 of the present invention;

[0025] Figure 2 A flowchart of an inverter data processing method provided in the second embodiment of the present invention;

[0026] Figure 3 This is a flow chart of an inverter data processing method provided in Embodiment 3 of the present invention;

[0027] Figure 4A schematic structural diagram of an inverter data processing device provided in a fourth embodiment of the present invention;

[0028] Figure 5 This is a structural diagram of an electronic device provided in Example 5 of the present invention. DETAILED DESCRIPTION

[0029] In order to enable those skilled in the art to better understand the solutions of the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the embodiments described 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 making creative efforts should fall within the scope of protection of the present invention.

[0030] It should be noted that the terms "candidate" and "target" and the like in the specification and claims of the present invention and the above-mentioned drawings are used to distinguish similar objects and are not necessarily used to describe a specific order or precedence. It should be understood that the terms used in this way are interchangeable where appropriate so that the embodiments of the present invention described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "including" and "etc." and any variations thereof are intended to cover non-exclusive inclusions, for example, a process, method, system, product or apparatus comprising a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or apparatus.

[0031] Example 1

[0032] Figure 1 A flowchart of an inverter data processing method is provided for the first embodiment of the present invention. This embodiment is applicable to the case of processing inverter data, and is particularly applicable to the case of processing inverter data to determine inverter efficiency. The method can be executed by an inverter data processing device, which can be implemented in the form of hardware and / or software, and the inverter data processing device can be configured in an electronic device. Figure 1 As shown, the method includes:

[0033] S110 : Obtain loss parameters of power switching devices and saturation conduction voltage drops of the power switching devices in the inverter system.

[0034] Among these, loss parameters include the operating junction temperature, collector current, collector-emitter voltage, reverse recovery loss, turn-off loss, and turn-on loss of power switching devices. A power switching device is a power electronic device that controls the on / off state of a circuit, ensuring reliable conduction or cutoff. It can withstand certain voltages and currents, has a high switching frequency, and maintains a sufficiently short on-time and off-time during switching state transitions. Power switching devices include: insulated-gate bipolar transistors (IGBTs), diodes, gate turn-off thyristors (GTOs), power transistors (GTRs), power field-effect transistors (MOSFETs), integrated gate-commutated thyristors (IGCTs), and symmetrical gate-commutated thyristors (SGCTs). The loss parameters of power switching devices affect the efficiency of the inverter system. The saturated conduction voltage drop of a power switching device refers to the voltage across the device when the positive terminal is connected to a high potential terminal and the negative terminal to a low potential terminal, achieving forward conduction. This saturation conduction voltage drop includes the IGBT forward voltage drop and the diode forward voltage drop. Junction temperature is the actual operating temperature of semiconductors in electronic devices.

[0035] For example, in an electronic circuit, if the anode of a diode is connected to a high-potential terminal and the cathode to a low-potential terminal, the diode will conduct. This connection is called forward bias. It should be noted that when the forward voltage applied to the diode is very small, the diode still cannot conduct, and the forward current flowing through the diode is very weak. Only when the forward voltage reaches a certain value can the diode conduct forward. After conduction, the voltage across the diode remains essentially unchanged. The voltage across the diode is called the diode's saturation conduction voltage drop.

[0036] Specifically, the power switching devices in the inverter system are identified, and the actual operating temperature of the insulated gate bipolar transistor in the power switching device is measured and obtained, and the actual operating temperature is used as the operating junction temperature of the power switching device. The collector current is measured and obtained. The turn-on loss of the power switching device under the DC bus voltage is used as the turn-on loss. At the same time, the turn-off loss of the power switching device under the DC bus voltage and the reverse recovery loss of the diode in the power switching device are obtained. The positive electrode of the diode is connected to the high potential terminal and the negative electrode is connected to the low potential terminal. The voltage across the two ends of the diode when the diode is forward-conducting is measured and obtained to obtain the saturation conduction voltage drop of the diode.

[0037] S120 , calculating the system loss of the inverter system according to the loss parameter, the saturation conduction voltage drop, and the number of power switching devices.

[0038] System losses refer to the turn-on and turn-off losses of the power switching devices in the inverter system. Turn-on loss refers to the power loss generated when the power tube switches from off to on; turn-off loss refers to the power loss generated when the power tube switches from on to off.

[0039] Specifically, IGBT losses are determined based on the duty cycle, collector current, switching frequency, IGBT turn-on losses, IGBT turn-off losses, and the IGBT forward voltage drop in the saturation conduction voltage drop. Diode losses are determined based on the duty cycle, diode forward current, and the diode forward voltage drop in the saturation conduction voltage drop. The duty cycle refers to the proportion of the power-on time relative to the total power-on time within a pulse cycle. The system losses of the inverter system are calculated based on the diode losses, IGBT losses, and the number of power switching devices.

[0040] For example, the system loss of the inverter system can be calculated based on the IGBT loss, diode loss and the number of power switching devices in the power switching device. Specifically, this can be achieved through the following sub-steps:

[0041] S1201. Determine the insulated gate bipolar transistor loss and the diode loss in the power switching device according to the turn-on loss of the power switching device with loss parameters.

[0042] Specifically, the calculation formula for the insulated gate bipolar transistor loss is shown in formula (1):

[0043] P igbt =P cond_igbt +P sw_igbt (1)

[0044] Among them, P igbt is the insulated gate bipolar transistor loss; P cond_igbt is the turn-on loss of IGBT; P sw_igbt is the switching loss of the IGBT.

[0045] Furthermore, the calculation formula for the IGBT turn-on loss is shown in formula (2):

[0046] P cond_igbt =d×Vcesat×I c (2)

[0047] Among them, P diode is the diode loss; d is the duty cycle; Vcesat is the IGBT conduction voltage drop; I c is the collector current.

[0048] The calculation formula of IGBT switching loss is shown in formula (3):

[0049] P sw_igbt =f sw (E on +E off ) (3)

[0050] Among them, fsw is the IGBT switching frequency, E on is the IGBT turn-on loss, E off is the IGBT turn-off loss.

[0051] The calculation formula for diode loss is shown in formula (4):

[0052] P diode =P cond_diode +P sw_diode (4)

[0053] Among them, P cond_diode is the turn-on loss of the diode; P sw_diode is the switching loss of the diode. Furthermore, the calculation formula of the diode turn-on loss is shown in formula (5):

[0054] P cond_diode =(1-d)V f I f (5)

[0055] Among them, V f is the forward voltage drop of the diode, I f is the diode forward current.

[0056] The calculation formula for the switching loss of the diode is shown in formula (6):

[0057] P sw_diode =f sw E rec (6)

[0058] Among them, E rec is the diode reverse recovery loss and turn-off loss.

[0059] S1202. Taking the sum of the insulated gate bipolar transistor loss and the diode loss as the loss value of a single power switching device.

[0060] Specifically, the calculation formula for the loss value of a single power switching device in the inverter system is shown in formula (7):

[0061] P chip =P igbt +P diode (7)

[0062] Among them, P chip is the loss value of a single power switching device in the inverter system.

[0063] S1203: Calculate the system loss of the inverter system according to the loss value of a single power switch device and the number of power switch devices.

[0064] Specifically, the calculation formula of the system loss of the inverter system is shown in formula (8):

[0065] P total =n*P chip (8)

[0066] Among them, P total is the system loss of the inverter system, and n is the number of power switching devices.

[0067] It is understandable that by calculating the system loss of the inverter system based on the IGBT loss, diode loss and the number of power switching devices in the power switching device, a more accurate switching loss calculation result can be obtained.

[0068] S130: Construct a load equivalent model of the load motor according to the three-phase inductance equivalent model, the three-phase mutual inductance equivalent model, and the three-phase resistance equivalent model of the load motor in the inverter system.

[0069] The load motor refers to a motor with load power, i.e., the motor used for power in the inverter system. The three-phase inductance equivalent model is the three-phase equivalent circuit model of the inductance in the load motor; the three-phase mutual inductance equivalent model is the three-phase equivalent circuit model of the mutual inductance circuit in the load motor; and the three-phase resistance equivalent model is the three-phase equivalent circuit model of the resistance in the load motor. Mutual inductance refers to the phenomenon in which a change in current in one coil generates an induced electromotive force in other coils. A mutual inductance circuit is a circuit that produces mutual inductance.

[0070] Specifically, a three-phase inductance equivalent model of the load motor is determined according to the inductance parameters of the inductor in the load motor and the circuit connection method in the load motor; a mutual inductance circuit in the load motor is determined according to the current and electromotive force changes of the coil in the load motor, and a three-phase mutual inductance equivalent model of the load motor is determined according to the mutual inductance circuit and the circuit connection method in the load motor; a three-phase resistance equivalent model of the load motor is determined according to the resistance parameters of the resistor in the load motor and the circuit connection method in the load motor; the three-phase inductance equivalent model, the three-phase mutual inductance equivalent model and the three-phase resistance equivalent model are connected to obtain a load equivalent model of the load motor.

[0071] Exemplarily, the load equivalent model of the load motor can be constructed through the following sub-steps:

[0072] S1301. For each speed segment, respectively construct a three-phase inductance equivalent model, a three-phase mutual inductance equivalent model, and a three-phase resistance equivalent model of the load motor in the inverter system under the speed segment.

[0073] The speed segment refers to the speed range of the load motor.

[0074] Specifically, the speed of the load motor is segmented to obtain at least two speed segments. For example, 0 r / s to 500 r / s, 501 r / s to 1000 r / s, and 1001 r / s to 1005 r / s can be used as speed segments, respectively. The above speed segment settings are only provided as an example; in actual applications, speed segments can be set according to actual needs. The three-phase inductance equivalent model, three-phase mutual inductance equivalent model, and three-phase resistance equivalent model of the load motor operating in each speed segment are determined.

[0075] S1302: Construct an equivalent model structure of the load motor in the speed range according to the three-phase inductance equivalent model, the three-phase mutual inductance equivalent model, and the three-phase resistance equivalent model in the speed range.

[0076] Specifically, for any speed segment, the three-phase inductance equivalent model, three-phase mutual inductance equivalent model and three-phase resistance equivalent model under the speed segment are determined, and the three-phase inductance equivalent model, three-phase mutual inductance equivalent model and three-phase resistance equivalent model under the speed segment are connected to obtain the equivalent model composition structure of the load motor under the speed segment.

[0077] S1303: Integrate the equivalent model structure at each speed range to obtain a load equivalent model of the load motor.

[0078] Specifically, based on the equivalent model composition structure of the load motor at each speed range, an equivalent model of the load motor at different speed ranges can be obtained. By integrating the equivalent model composition structures at each speed range, a load equivalent model of the load motor can be obtained. It is understood that the load equivalent model includes at least two equivalent model composition structures, the number of equivalent model composition structures being consistent with the number of speed ranges, and different equivalent model composition structures corresponding to different speed ranges.

[0079] It can be understood that determining the load equivalent model of the load motor based on the equivalent model composition structure at each speed range allows the load equivalent model to better simulate the operating characteristics of the load motor in the speed range above the inflection point speed. The inflection point refers to the torque output capacity corresponding to the speed at which the load motor reaches the limit of its power conversion capacity, that is, the peak power point of the load motor. After the load motor reaches peak power, the power cannot continue to rise, and if the speed continues to increase, the output torque capacity at the corresponding speed will decrease.

[0080] S140. Construct a system simulation model of the inverter system based on power switching devices, loss parameters, system losses, and load equivalent models.

[0081] The system simulation model refers to a circuit simulation model constructed by simulation software and can be used to characterize the inverter system.

[0082] Specifically, the system model structure of the inverter system is determined based on the equivalent model of the power switching devices and the power supply. The loss parameters and system loss are used as model parameters of the circuit model structure, and the system simulation model of the inverter system is determined through simulation software.

[0083] S150 : Based on the fixed modulation wave frequency, run the system simulation model to determine the inverter efficiency.

[0084] Specifically, after determining the circuit simulation model of the inverter system, the fixed modulation wave frequency and bias voltage in the circuit simulation model are determined to obtain the output current and output frequency of the circuit simulation model under the fixed modulation wave frequency and bias voltage. Based on the bias voltage, output current, and output frequency, the inverter efficiency under the output current and output frequency conditions can be determined. The bias voltage refers to the voltage that should be set between the base and emitter and between the collector and base in the transistor amplifier circuit when the transistor is in the amplification state.

[0085] Exemplarily, the inverter efficiency may be determined by running a system simulation model based on a fixed modulation wave frequency to determine the output current and output frequency of the system simulation model; and scanning the bias voltage to determine the inverter efficiency under the output current and output frequency.

[0086] Specifically, the fixed modulation wave frequency can be set as needed. The fixed modulation wave frequency and bias voltage are used as input parameters for the system simulation model. The system simulation model is run, and the fixed modulation wave frequency is applied to the system simulation model to obtain the output current and output frequency of the system simulation model. By sweeping the bias voltage of the system simulation model, the inverter efficiency under the output current and output frequency conditions can be obtained.

[0087] By scanning the bias voltage of the system simulation model under the action of a fixed modulation wave frequency to determine the inverter efficiency, the speed of obtaining the inverter efficiency can be improved.

[0088] The technical solution provided in this embodiment obtains the loss parameters and saturation conduction voltage drop of the power switching devices in the inverter system; calculates the system loss of the inverter system based on the loss parameters, saturation conduction voltage drop and the number of power switching devices; constructs the load equivalent model of the load motor based on the three-phase inductance equivalent model, three-phase mutual inductance equivalent model and three-phase resistance equivalent model of the load motor in the inverter system; constructs a system simulation model of the inverter system based on the power switching devices, loss parameters, switching loss and load equivalent model; runs the system simulation model based on a fixed modulation wave frequency to determine the inverter efficiency. The above solution provides a method for constructing a system simulation model of the inverter system based on the system loss of the inverter system and the load equivalent model of the load motor, so as to determine the inverter efficiency based on the system simulation model. It solves the problem of low output efficiency calculation speed and high calculation cost caused by directly testing the output efficiency of the physical sample of the inverter system to obtain the output efficiency of the inverter system. A system simulation model of the inverter system is constructed based on the loss parameters of the inverter system's power switching devices and the load equivalent model of the load motor. Simulation experiments are then conducted based on this system simulation model to obtain the inverter efficiency. This allows for the construction of an accurate simulation model of the inverter system, while also improving the speed and cost of calculating the inverter efficiency. The inverter system can also be evaluated based on the inverter efficiency, improving the efficiency of the inverter system evaluation.

[0089] Example 2

[0090] Figure 2 This is a flowchart of an inverter data processing method provided by Example 2 of the present invention. This embodiment is optimized based on the above embodiment and provides a preferred implementation scheme for constructing a system simulation model of an inverter system based on power switching devices, loss parameters, switching losses and load equivalent models. Specifically, Figure 2 As shown, the method includes:

[0091] S210 : Obtain loss parameters of power switching devices and saturation conduction voltage drops of the power switching devices in the inverter system.

[0092] Among them, the loss parameters include the operating junction temperature, collector current, reverse recovery loss, turn-off loss and turn-on loss of the power switching device.

[0093] S220 , calculating the system loss of the inverter system according to the loss parameter, the saturation conduction voltage drop, and the number of power switching devices.

[0094] S230: Construct a load equivalent model of the load motor according to a three-phase inductance equivalent model, a three-phase mutual inductance equivalent model, and a three-phase resistance equivalent model of the load motor in the inverter system.

[0095] S240: Determine an intelligent power unit of the inverter system according to power switching devices, loss parameters, and system losses.

[0096] The intelligent power unit of the inverter system refers to a model used to characterize the circuit connection state and loss condition of the power switching devices in the inverter system. The intelligent power unit includes the power switching devices, the loss parameters of the power switching devices and the system loss.

[0097] Specifically, the inverter system's power switching devices are used to determine the inverter system's busbars, capacitors, drive circuits, IGBTs, and other circuit components. Furthermore, the inverter system's intelligent power unit is determined based on the circuit components, loss parameters, and system losses.

[0098] S250 , inputting a modulation wave frequency signal into the system simulation model, adopting a constant voltage-frequency ratio algorithm, and determining a control voltage according to the modulation wave frequency signal.

[0099] The constant voltage-frequency ratio algorithm is an algorithm that controls the ratio of the modulation wave frequency to the control voltage to a fixed value. The control voltage is applied to the intelligent power unit to control the intelligent power unit.

[0100] Specifically, a modulation wave frequency signal is input into the simulation model to determine a constant voltage-frequency ratio of the control voltage to the modulation wave frequency. Based on the modulation wave frequency signal and the constant voltage-frequency ratio, the control voltage is determined by a constant voltage-frequency ratio algorithm.

[0101] S260, using a pulse width modulation algorithm, obtains the three-phase current for driving the load equivalent model by controlling the operation of the intelligent power unit in the voltage control system simulation model.

[0102] Among them, the pulse width modulation algorithm, namely the SVPWM algorithm, is a pulse width modulation wave generated by a specific switching mode composed of six power switching elements of the three-phase power inverter, which can make the output current waveform as close to the ideal sine waveform as possible.

[0103] Specifically, since the state variables such as voltage and current in the three-phase system have different degrees of coupling, after determining the control voltage, it is necessary to perform a Clarke transform on the control voltage so that the control voltage is transformed from a three-phase coordinate system to a two-phase rotating coordinate system. The Clarke transform is to transform the physical quantity based on the three-axis two-dimensional stator stationary coordinate system into a two-axis stator stationary coordinate system. Through the Clarke transform, the coupled symmetrical three-phase system can be decoupled into a two-phase system that can be independently controlled, thereby reducing the complexity of the controller design. Then, a pulse width modulation algorithm is used to control the operation of the intelligent power unit in the voltage control system simulation model to obtain the three-phase alternating current that drives the load equivalent model, and the three-phase alternating current is used as the three-phase current that drives the load equivalent model.

[0104] S270. Construct a system simulation model of the inverter system based on the intelligent power unit, control voltage, load equivalent model, and three-phase current.

[0105] Specifically, a system circuit model of the system simulation model is constructed based on the intelligent power unit and the load equivalent model. The control voltage and three-phase current are used as the control voltage and three-phase current of the system circuit model and input into the system circuit model to obtain the system simulation model of the inverter system.

[0106] S280: Based on the fixed modulation wave frequency, run the system simulation model to determine the inverter efficiency.

[0107] The technical solution of this embodiment obtains the loss parameters of the power switching devices and the saturated conduction voltage drop of the power switching devices in the inverter system; calculates the system loss of the inverter system based on the loss parameters, saturated conduction voltage drop and the number of power switching devices; constructs a load equivalent model of the load motor based on the three-phase inductance equivalent model, three-phase mutual inductance equivalent model and three-phase resistance equivalent model of the load motor in the inverter system; determines the intelligent power unit of the inverter system based on the power switching devices, loss parameters and switching losses; inputs the modulation wave frequency signal into the system simulation model, adopts a constant voltage-frequency ratio algorithm, and determines the control voltage based on the modulation wave frequency signal; adopts a pulse width modulation algorithm to control the operation of the intelligent power unit in the system simulation model by controlling the voltage to obtain the three-phase current for driving the load equivalent model to operate; constructs a system simulation model of the inverter system based on the intelligent power unit, control voltage, load equivalent model and three-phase current; runs the system simulation model based on a fixed modulation wave frequency to determine the inverter efficiency.

[0108] For example, based on the above embodiment, an efficiency MAP of the inverter efficiency may be plotted according to the corresponding relationship between the inverter efficiency and the performance parameters of the load motor. Specifically, this may be achieved through the following steps:

[0109] Step 1: Obtain a torque-current value correspondence between the torque of the load motor and the effective current value of the three-phase current, a speed-current frequency correspondence between the motor speed of the load motor and the current frequency of the three-phase current, and an efficiency-current parameter correspondence between the inverter efficiency and the current parameters of the three-phase current.

[0110] The current parameters include the effective value of the three-phase current and the current frequency. The effective value of the current refers to the effective value of the phase current in the three-phase current. The current parameters include the effective value of the three-phase current and the current frequency.

[0111] Specifically, the torque-current value correspondence between the torque of the load motor and the effective current value of the three-phase current may be determined according to a correspondence table between the torque of the load motor and the effective current value.

[0112] For example, the corresponding relationship between the torque and the effective current of the load motor is shown in Table 1:

[0113] Table 1

[0114] Motor speed (rpm) Current RMS Torque (Nm) 500 10 7.931497 500 20 16.67617 500 30 26.15843 500 40 36.52843 500 50 47.26441 500 60 58.78324 500 70 70.15262 500 80 82.06331 500 90 93.6939 1000 10 7.89609 1000 20 16.63668 1000 30 26.11546 1000 40 36.4822 1000 50 47.21436 1000 60 58.72926 1000 70 70.09561 1000 80 82.00327 1000 90 93.63088

[0115] Furthermore, the speed-current-frequency correspondence between the motor speed of the load motor and the current frequency of the three-phase current is shown in formula (9):

[0116]

[0117] Where n is the motor speed of the load motor; f is the current frequency of the three-phase current; and P is the number of motor pole pairs of the load motor. Each set of coils in the load motor generates N and S magnetic poles. The number of magnetic poles contained in each phase of each load motor is the pole number. The magnetic poles appear in pairs, and each pair of magnetic poles is the motor pole pair. Based on the inverter efficiency, the output current and output frequency corresponding to the inverter efficiency are determined. The output current is the three-phase current, and the output frequency is the current frequency of the three-phase current. Based on the correspondence between the inverter efficiency and the effective current value of the three-phase current, and the correspondence between the inverter efficiency and the current frequency of the three-phase current, the efficiency-current parameter correspondence between the inverter efficiency and the current parameters of the three-phase current is determined.

[0118] Step 2: Determine the efficiency-performance parameter correspondence between the inverter efficiency and the performance parameters of the load motor according to the torque-current value correspondence, the speed-current frequency correspondence, and the efficiency-current parameter correspondence.

[0119] The performance parameters of the load motor include the torque and the motor speed of the load motor.

[0120] Specifically, based on the efficiency-performance parameter correspondence between the inverter efficiency and the performance parameters of the load motor, the correspondence between the inverter efficiency and the effective current value is determined. Based on the correspondence between the inverter efficiency and the effective current value and the torque-current value correspondence, the efficiency-torque correspondence between the inverter efficiency and the torque of the load motor is determined. Based on the efficiency-performance parameter correspondence between the inverter efficiency and the performance parameters of the load motor, the correspondence between the inverter efficiency and the current frequency is determined. Based on the correspondence between the inverter efficiency and the current frequency and the speed-current frequency correspondence, the efficiency-speed correspondence between the inverter efficiency and the motor speed of the load motor is determined. Based on the efficiency-torque correspondence and the efficiency-speed correspondence, the efficiency-performance parameter correspondence between the inverter efficiency and the performance parameters of the load motor is determined.

[0121] Step 3: Draw the efficiency MAP of the inverter efficiency based on the efficiency-performance parameter correspondence.

[0122] In the efficiency MAP, the horizontal axis is generally the speed of the load motor, and the vertical axis is the torque of the load motor. In the efficiency MAP, one speed point and one torque point correspond to one efficiency point.

[0123] Specifically, a coordinate system is established with the load motor speed as the horizontal axis and the load motor torque as the vertical axis. Based on the efficiency-performance parameter correspondence, efficiency points corresponding to the inverter efficiency are marked in the coordinate system. By connecting the efficiency points, an efficiency MAP of the inverter efficiency is plotted.

[0124] Based on the torque-current value correspondence, the speed-current frequency correspondence, and the efficiency-current parameter correspondence, the efficiency-performance parameter correspondence between the inverter efficiency and the performance parameters of the load motor is determined. Based on this efficiency-performance parameter correspondence, an efficiency map of the inverter efficiency is plotted. This improves the efficiency of plotting the efficiency map of the inverter efficiency and allows for an accurate efficiency map to be obtained. This allows for evaluation of the conversion efficiency of the inverter system based on the efficiency map, improving evaluation efficiency.

[0125] Example 3

[0126] Figure 3 This is a flowchart of an inverter data processing method provided by the third embodiment of the present invention. This embodiment is optimized based on the above embodiment and provides a preferred implementation method for determining the inverter efficiency based on a fixed modulation wave frequency and running a system simulation model. Specifically, Figure 3 As shown, the method includes:

[0127] S310: Obtain loss parameters of power switching devices and saturation conduction voltage drops of the power switching devices in the inverter system.

[0128] Among them, the loss parameters include the operating junction temperature, collector current, reverse recovery loss, turn-off loss and turn-on loss of the power switching device.

[0129] S320: Calculate the system loss of the inverter system according to the loss parameter, the saturation conduction voltage drop, and the number of power switching devices.

[0130] S330: Construct a load equivalent model of the load motor according to a three-phase inductance equivalent model, a three-phase mutual inductance equivalent model, and a three-phase resistance equivalent model of the load motor in the inverter system.

[0131] S340. Construct a system simulation model of the inverter system based on power switching devices, loss parameters, switching losses and load equivalent models.

[0132] S350: Based on the fixed modulation wave frequency, run the system simulation model to obtain performance parameters of the load motor.

[0133] Specifically, a fixed modulation wave frequency is used as an input signal to the system simulation model. The system simulation model is run, and the control voltage of the system simulation model is determined based on the constant voltage-to-frequency ratio algorithm and the fixed modulation wave frequency. Based on the control voltage, the current parameters of the three-phase current driving the load equivalent model are determined. Based on the correspondence between the current parameters and the performance parameters of the load motor, the performance parameters of the load motor are determined.

[0134] S360: Based on the performance parameters, segment the motor speed of the load motor to obtain at least two speed segments.

[0135] Specifically, the performance parameters include the torque and motor speed of the load motor. According to actual needs, the motor speed in the performance parameters is segmented to obtain at least two speed segments. The speed segment can be a speed range or a fixed speed value used to characterize the speed range. In this embodiment, the speed segment is a fixed speed value. The calculation formula of the speed segment is shown in formula (9):

[0136]

[0137] Among them, ω is the speed segment; ω i is the speed of the load motor at the i-th operating point; n is the number of operating points of the load motor within the time range corresponding to the speed segment.

[0138] S370: Determine a weight of the speed segment energy according to the speed segment energy corresponding to the speed segment and the total speed energy.

[0139] The speed segment energy refers to the energy generated by the load motor within the time range corresponding to the speed segment. The total speed energy refers to the sum of all speed segment energies.

[0140] Specifically, the calculation formula of the speed section energy is shown in formula (10):

[0141]

[0142] Among them, T i is the torque of the load motor at the i-th operating point; Δt is a fixed coefficient.

[0143] The calculation formula of the speed section energy weight is shown in formula (11):

[0144]

[0145] Wherein, k is the total number of speed segments.

[0146] S380: Determine the inverter efficiency according to the weight and the segmented efficiency of the inverter system at each speed segment.

[0147] Specifically, the segmented efficiency of the inverter system is determined based on the speed value and equivalent torque of the load motor corresponding to each speed segment. Equivalent torque refers to the torque of the load motor within the event range corresponding to the speed segment. The calculation formula of the equivalent torque is shown in formula (12):

[0148]

[0149] According to the weight and the segmented efficiency of the inverter system at each speed segment, the calculation formula for determining the inverter efficiency is shown in formula (13):

[0150]

[0151] Where, η is the inverter efficiency; η i is the segment efficiency of the inverter system; D i is the weight.

[0152] The technical solution of this embodiment obtains the loss parameters and saturation conduction voltage drop of the power switching devices in the inverter system; calculates the system loss of the inverter system based on the loss parameters, saturation conduction voltage drop, and the number of power switching devices; constructs a load equivalent model of the load motor based on the three-phase inductance equivalent model, three-phase mutual inductance equivalent model, and three-phase resistance equivalent model of the load motor in the inverter system; constructs a system simulation model of the inverter system based on the power switching devices, loss parameters, switching loss, and load equivalent model; runs the system simulation model based on a fixed modulation wave frequency to obtain performance parameters of the load motor; based on the performance parameters, segments the motor speed of the load motor to obtain at least two speed segments; determines the speed segment energy weight based on the speed segment energy corresponding to the speed segment and the total speed energy; and determines the inverter efficiency based on the weight and the segment efficiency of the inverter system in each speed segment. Because different speed segments have different weights in the process of calculating the inverter efficiency, if the speed segment energy weight is not considered during the process of calculating the inverter efficiency, the obtained inverter efficiency may be inaccurate. The above solution provides a method for determining speed segment energy weights based on the speed segment energy corresponding to the load motor's speed segment. This method then determines inverter efficiency based on the speed segment energy weights and the corresponding segment efficiency. This method increases the speed of inverter efficiency acquisition and the accuracy of inverter efficiency calculation. This allows for more accurate evaluation results of inverter systems based on inverter efficiency.

[0153] Example 4

[0154] Figure 4 This is a structural diagram of an inverter data processing device provided by the fourth embodiment of the present invention. This embodiment is applicable to the case of processing inverter data. Figure 4 As shown, the inverter data processing device includes: a loss parameter acquisition module 410, a system loss calculation module 420, a load equivalent model determination module 430, a system simulation model construction module 440 and a power conversion efficiency determination module 450.

[0155] The loss parameter acquisition module 410 is configured to acquire the loss parameters and saturation conduction voltage drop of the power switching device in the inverter system; wherein the loss parameters include the operating junction temperature, collector current, collector-emitter voltage, reverse recovery loss, turn-off loss, and turn-on loss of the power switching device;

[0156] A system loss calculation module 420 is used to calculate the system loss of the inverter system based on the loss parameter, the saturation conduction voltage drop and the number of power switching devices;

[0157] A load equivalent model determination module 430 is configured to construct a load equivalent model of the load motor according to a three-phase inductance equivalent model, a three-phase mutual inductance equivalent model, and a three-phase resistance equivalent model of the load motor in the inverter system;

[0158] A system simulation model building module 440 is used to build a system simulation model of the inverter system based on power switching devices, loss parameters, system losses and load equivalent models;

[0159] The power conversion efficiency determination module 450 is configured to run a system simulation model based on a fixed modulation wave frequency to determine the inverter efficiency.

[0160] The technical solution provided in this embodiment obtains the loss parameters of the power switching devices and the saturated conduction voltage drop of the power switching devices in the inverter system; calculates the system loss of the inverter system based on the loss parameters, the saturated conduction voltage drop and the number of power switching devices; constructs the load equivalent model of the load motor based on the three-phase inductance equivalent model, the three-phase mutual inductance equivalent model and the three-phase resistance equivalent model of the load motor in the inverter system; constructs a system simulation model of the inverter system based on the power switching devices, loss parameters, system loss and load equivalent model; runs the system simulation model based on a fixed modulation wave frequency to determine the inverter efficiency. The above solution provides a method for constructing a system simulation model of the inverter system based on the system loss of the inverter system and the load equivalent model of the load motor, so as to determine the inverter efficiency based on the system simulation model. It solves the problem of low output efficiency calculation speed and high calculation cost caused by directly testing the output efficiency of the physical sample of the inverter system to obtain the output efficiency of the inverter system. A system simulation model of the inverter system is constructed based on the loss parameters of the inverter system's power switching devices and the load equivalent model of the load motor. Simulation experiments are then conducted based on this system simulation model to obtain the inverter efficiency. This allows for the construction of an accurate simulation model of the inverter system, while also improving the speed of inverter efficiency calculation and reducing the cost of power conversion efficiency calculations. The inverter system can also be evaluated based on the inverter efficiency, improving the efficiency of inverter system evaluation.

[0161] Exemplarily, the system loss calculation module 420 is specifically configured to:

[0162] Determine the insulated gate bipolar transistor loss and diode loss in the power switching device based on the turn-on loss of the power switching device with loss parameters;

[0163] The sum of the IGBT loss and the diode loss is taken as the loss value of a single power switch device;

[0164] Calculate the system loss of the inverter system based on the loss value of a single power switching device and the number of power switching devices.

[0165] Exemplarily, the load equivalent model determination module 430 is specifically configured to:

[0166] For each speed range, the three-phase inductance equivalent model, three-phase mutual inductance equivalent model and three-phase resistance equivalent model of the load motor in the inverter system are constructed respectively;

[0167] According to the three-phase inductance equivalent model, three-phase mutual inductance equivalent model and three-phase resistance equivalent model in this speed range, the equivalent model composition structure of the load motor in this speed range is constructed;

[0168] The equivalent model structure under each speed range is integrated to obtain the load equivalent model of the load motor.

[0169] Exemplarily, the system simulation model building module 440 includes:

[0170] An intelligent power unit determination unit, configured to determine an intelligent power unit of the inverter system based on power switching devices, loss parameters, and system losses;

[0171] The control voltage determination unit is used to input the modulation wave frequency signal into the system simulation model and determine the control voltage according to the modulation wave frequency signal using a constant voltage-frequency ratio algorithm;

[0172] A three-phase current acquisition unit is used to obtain the three-phase current for driving the load equivalent model by controlling the operation of the intelligent power unit in the voltage control system simulation model using a pulse width modulation algorithm;

[0173] The simulation model building unit is used to build a system simulation model of the inverter system according to the intelligent power unit, the control voltage, the load equivalent model and the three-phase current.

[0174] Exemplarily, the inverter data processing device further includes:

[0175] a parameter relationship determination module, configured to obtain a torque-current value correspondence between the torque of the load motor and the effective current value of the three-phase current, a speed-current frequency correspondence between the motor speed of the load motor and the current frequency of the three-phase current, and an efficiency-current parameter correspondence between the inverter efficiency and the current parameters of the three-phase current; wherein the current parameters include the effective current value and current frequency of the three-phase current;

[0176] an efficiency relationship determination module, configured to determine an efficiency-performance parameter correspondence relationship between the inverter efficiency and the performance parameters of the load motor based on the torque-current value correspondence relationship, the speed-current frequency correspondence relationship, and the efficiency-current parameter correspondence relationship; wherein the performance parameters of the load motor include the torque and motor speed of the load motor;

[0177] The efficiency MAP drawing module is used to draw the efficiency MAP of the inverter efficiency according to the corresponding relationship between efficiency and performance parameters.

[0178] Furthermore, the power conversion efficiency determination module 450 is specifically configured to:

[0179] Based on the fixed modulation wave frequency, the system simulation model is run to determine the output current and output frequency of the system simulation model;

[0180] The bias voltage is swept to determine the inverter efficiency at output current and output frequency.

[0181] Exemplarily, the power conversion efficiency determination module 450 is further configured to:

[0182] Based on the fixed modulation wave frequency, the system simulation model is run to obtain the performance parameters of the load motor;

[0183] Based on the performance parameters, the motor speed of the load motor is segmented to obtain at least two speed segments;

[0184] Determine the weight of the speed segment energy according to the speed segment energy corresponding to the speed segment and the total speed energy;

[0185] The operating efficiency of the inverter system is determined based on the weight and the segmented efficiency of the inverter system at each speed segment.

[0186] The inverter data processing device provided in this embodiment can be applied to the inverter data processing method provided in any of the above embodiments, and has corresponding functions and beneficial effects.

[0187] Example 5

[0188] Figure 5 A schematic diagram of the structure of an electronic device 10 that can be used to implement an embodiment of the present invention is shown. The electronic device is intended to represent various forms of digital computers, such as laptop computers, desktop computers, workstations, personal digital assistants, servers, blade servers, mainframe computers, and other suitable computers. The electronic device can also represent various forms of mobile devices, such as personal digital processing, cellular phones, smart phones, wearable devices (such as helmets, glasses, watches, etc.) and other similar computing devices. The components shown herein, their connections and relationships, and their functions are merely examples and are not intended to limit the implementation of the present invention described and / or claimed herein.

[0189] like Figure 5As shown, the electronic device 10 includes at least one processor 11 and a memory, such as a read-only memory (ROM) 12, a random access memory (RAM) 13, etc., which is communicatively connected to the at least one processor 11. The memory stores a computer program that can be executed by the at least one processor. The processor 11 can perform various appropriate actions and processes according to the computer program stored in the read-only memory (ROM) 12 or the computer program loaded from the storage unit 18 into the random access memory (RAM) 13. Various programs and data required for the operation of the electronic device 10 can also be stored in the RAM 13. The processor 11, ROM 12, and RAM 13 are connected to each other via a bus 14. An input / output (I / O) interface 15 is also connected to the bus 14.

[0190] Multiple components in the electronic device 10 are connected to the I / O interface 15, including an input unit 16, such as a keyboard, a mouse, etc.; an output unit 17, such as various types of displays, speakers, etc.; a storage unit 18, such as a magnetic disk, an optical disk, etc.; and a communication unit 19, such as a network card, a modem, a wireless communication transceiver, etc. The communication unit 19 allows the electronic device 10 to exchange information / data with other devices via a computer network such as the Internet and / or various telecommunication networks.

[0191] The processor 11 can be any general-purpose and / or specialized processing component with processing and computing capabilities. Some examples of the processor 11 include, but are not limited to, a central processing unit (CPU), a graphics processing unit (GPU), various specialized artificial intelligence (AI) computing chips, various processors that run machine learning model algorithms, a digital signal processor (DSP), and any other suitable processor, controller, microcontroller, etc. The processor 11 executes the various methods and processes described above, such as the inverter data processing method.

[0192] In some embodiments, the inverter data processing method can be implemented as a computer program tangibly contained in a computer-readable storage medium, such as the storage unit 18. In some embodiments, part or all of the computer program can be loaded and / or installed on the electronic device 10 via the ROM 12 and / or the communication unit 19. When the computer program is loaded into the RAM 13 and executed by the processor 11, one or more steps of the inverter data processing method described above can be performed. Alternatively, in other embodiments, the processor 11 can be configured to execute the inverter data processing method in any other appropriate manner (e.g., via firmware).

[0193] Various embodiments of the systems and techniques described herein can be implemented in digital electronic circuit systems, integrated circuit systems, field programmable gate arrays (FPGAs), application specific integrated circuits (ASICs), application specific standard products (ASSPs), system-on-chip systems (SOCs), programmable logic devices (CPLDs), computer hardware, firmware, software, and / or combinations thereof. These various embodiments can include being implemented in one or more computer programs that are executable and / or interpreted on a programmable system that includes at least one programmable processor, which can be a special purpose or general purpose programmable processor that can receive data and instructions from a storage system, at least one input device, and at least one output device, and transmit data and instructions to the storage system, the at least one input device, and the at least one output device.

[0194] Computer programs for implementing the methods of the present invention may be written in any combination of one or more programming languages. These computer programs may be provided to a processor of a general-purpose computer, a special-purpose computer, or other programmable data processing device, such that when the computer program is executed by the processor, the functions / operations specified in the flowcharts and / or block diagrams are implemented. The computer program may be executed entirely on the machine, partially on the machine, as a stand-alone software package, partially on the machine and partially on a remote machine, or entirely on a remote machine or server.

[0195] In the context of the present invention, computer-readable storage media can be tangible media that can contain or store a computer program for use with an instruction execution system, device or equipment or used in combination with an instruction execution system, device or equipment. Computer-readable storage media can include but are not limited to electronic, magnetic, optical, electromagnetic, infrared or semiconductor systems, devices or equipment, or any suitable combination of the foregoing. Alternatively, computer-readable storage media can be machine-readable signal media. More specific examples of machine-readable storage media can include electrical connections based on one or more lines, portable computer disks, hard disks, random access memories (RAM), read-only memories (ROM), erasable programmable read-only memories (EPROM or flash memory), optical fibers, portable compact disk read-only memories (CD-ROM), optical storage devices, magnetic storage devices, or any suitable combination of the foregoing.

[0196] To provide interaction with a user, the systems and techniques described herein can be implemented on an electronic device having: a display device (e.g., a CRT (cathode ray tube) or LCD (liquid crystal display) monitor) for displaying information to the user; and a keyboard and pointing device (e.g., a mouse or trackball) through which the user can provide input to the electronic device. Other types of devices can also be used to provide interaction with the user; for example, the feedback provided to the user can be any form of sensory feedback (e.g., visual feedback, auditory feedback, or tactile feedback); and input from the user can be received in any form (including acoustic input, voice input, or tactile input).

[0197] The systems and techniques described herein can be implemented in a computing system that includes back-end components (e.g., as a data server), or a computing system that includes middleware components (e.g., an application server), or a computing system that includes front-end components (e.g., a user computer with a graphical user interface or web browser through which a user can interact with implementations of the systems and techniques described herein), or a computing system that includes any combination of such back-end components, middleware components, or front-end components. The components of the system can be interconnected by any form or medium of digital data communication (e.g., a communication network). Examples of communication networks include: a local area network (LAN), a wide area network (WAN), a blockchain network, and the Internet.

[0198] A computing system may include clients and servers. The clients and servers are typically remote from each other and typically interact via a communication network. This client-server relationship arises through computer programs running on the respective computers, creating a client-server relationship. The server may be a cloud server, also known as a cloud computing server or cloud host. This server is a hosting product within the cloud computing service ecosystem that addresses the management difficulties and limited scalability of traditional physical hosting and VPS services.

[0199] It should be understood that the various forms of the processes shown above can be used to reorder, add, or delete steps. For example, the steps described in the present invention can be performed in parallel, sequentially, or in a different order, as long as the desired results of the technical solution of the present invention can be achieved. This is not limited herein.

[0200] The above specific embodiments do not limit the scope of protection of the present invention. Those skilled in the art will appreciate that various modifications, combinations, sub-combinations, and substitutions may be made based on design requirements and other factors. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention are intended to be included within the scope of protection of the present invention.

Claims

1. A method for processing inverter data, characterized in that: include: Obtaining loss parameters of a power switching device in an inverter system and a saturation conduction voltage drop of the power switching device; wherein the loss parameters include an operating junction temperature, a collector current, a collector-emitter voltage, a reverse recovery loss, a turn-off loss, and a turn-on loss of the power switching device; Calculating the system loss of the inverter system according to the loss parameter, the saturation conduction voltage drop, and the number of the power switching devices; Constructing a load equivalent model of the load motor according to a three-phase inductance equivalent model, a three-phase mutual inductance equivalent model, and a three-phase resistance equivalent model of the load motor in the inverter system; Constructing a system simulation model of the inverter system based on the power switching device, the loss parameter, the system loss and the load equivalent model; Based on a fixed modulation wave frequency, the system simulation model is run to determine the inverter efficiency.

2. The method according to claim 1, characterized in that Calculating the system loss of the inverter system according to the loss parameter, the saturation conduction voltage drop, and the number of the power switching devices includes: Determining the insulated gate bipolar transistor loss and the diode loss in the power switching device according to the turn-on loss of the power switching device having the loss parameter; Taking the sum of the IGBT loss and the diode loss as the loss value of a single power switching device; The system loss of the inverter system is calculated according to the loss value of a single power switching device and the number of the power switching devices.

3. The method according to claim 1, characterized in that The step of constructing a load equivalent model of the load motor according to a three-phase inductance equivalent model, a three-phase mutual inductance equivalent model, and a three-phase resistance equivalent model of the load motor in the inverter system includes: For each speed segment, a three-phase inductance equivalent model, a three-phase mutual inductance equivalent model, and a three-phase resistance equivalent model of the load motor in the inverter system under the speed segment are respectively constructed; According to the three-phase inductance equivalent model, the three-phase mutual inductance equivalent model and the three-phase resistance equivalent model in the speed range, an equivalent model composition structure of the load motor in the speed range is constructed; The equivalent model component structures at each speed segment are integrated to obtain a load equivalent model of the load motor.

4. The method according to claim 1, wherein The constructing of a system simulation model of the inverter system based on the power switching device, the loss parameter, the system loss and the load equivalent model includes: Determining an intelligent power unit of the inverter system according to the power switching device, the loss parameter and the system loss; Inputting a modulation wave frequency signal into the system simulation model, and using a constant voltage-frequency ratio algorithm to determine a control voltage according to the modulation wave frequency signal; Using a pulse width modulation algorithm, the intelligent power unit in the system simulation model is controlled by the control voltage to obtain a three-phase current for driving the load equivalent model to operate; A system simulation model of the inverter system is constructed according to the intelligent power unit, the control voltage, the load equivalent model and the three-phase current.

5. The method according to claim 4, characterized in that After determining the inverter efficiency, it also includes: Obtaining a torque-current value correspondence between the torque of the load motor and the effective current value of the three-phase current, a speed-current frequency correspondence between the motor speed of the load motor and the current frequency of the three-phase current, and an efficiency-current parameter correspondence between the inverter efficiency and the current parameters of the three-phase current; wherein the current parameters include the effective current value and current frequency of the three-phase current; Determining an efficiency-performance parameter correspondence between the inverter efficiency and the performance parameters of the load motor according to the torque-current value correspondence, the speed-current frequency correspondence, and the efficiency-current parameter correspondence; wherein the performance parameters of the load motor include the torque and motor speed of the load motor; An efficiency MAP of the inverter efficiency is plotted according to the efficiency-performance parameter correspondence.

6. The method according to claim 1, characterized in that The step of running the system simulation model based on the fixed modulation wave frequency to determine the inverter efficiency includes: Based on a fixed modulation wave frequency, running the system simulation model to determine the output current and output frequency of the system simulation model; The bias voltage is swept to determine the inverter efficiency at output current and output frequency.

7. The method according to claim 1, characterized in that The step of running the system simulation model based on the fixed modulation wave frequency to determine the inverter efficiency includes: Based on a fixed modulation wave frequency, running the system simulation model to obtain performance parameters of the load motor; Based on the performance parameter, segmenting the motor speed of the load motor to obtain at least two speed segments; Determining a weight of the speed segment energy according to the speed segment energy corresponding to the speed segment and the total speed energy; The operating efficiency of the inverter system is determined according to the weight and the segmented efficiency of the inverter system in each speed segment.

8. An inverter data processing device, characterized in that: include: A loss parameter acquisition module, configured to acquire loss parameters of a power switching device in an inverter system and a saturation conduction voltage drop of the power switching device; wherein the loss parameters include an operating junction temperature, a collector current, a collector-emitter voltage, a reverse recovery loss, a turn-off loss, and a turn-on loss of the power switching device; a system loss calculation module, configured to calculate the system loss of the inverter system according to the loss parameter, the saturation conduction voltage drop, and the number of the power switching devices; a load equivalent model determination module, configured to construct a load equivalent model of the load motor according to a three-phase inductance equivalent model, a three-phase mutual inductance equivalent model, and a three-phase resistance equivalent model of the load motor in the inverter system; A system simulation model building module, configured to build a system simulation model of the inverter system based on the power switching device, the loss parameter, the system loss and the load equivalent model; The power conversion efficiency determination module is used to run the system simulation model based on a fixed modulation wave frequency to determine the inverter efficiency.

9. An electronic device, characterized in that: The electronic device comprises: at least one processor; and a memory communicatively connected to the at least one processor; wherein, The memory stores a computer program that can be executed by the at least one processor. The computer program is executed by the at least one processor to enable the at least one processor to perform the inverter data processing method according to any one of claims 1 to 7.

10. A computer-readable storage medium, characterized in that The computer-readable storage medium stores computer instructions, and the computer instructions are used to enable a processor to implement the inverter data processing method according to any one of claims 1 to 7 when executed.

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