Mute permanent magnet generator control system

Abstract

The invention belongs to the technical field of electric power output control of motors, and particularly discloses a mute permanent magnet generator control system, which comprises the following steps of: defining information entropy of a motor load data set by acquiring a bearing working condition of a motor in a historical cycle operation process; accordingly, the corresponding complexity and uncertainty of the load change in the operation process of the motor are reflected, and then the power output demand of the generator in future periodic operation is predicted and evaluated; proper control modes of power output are selected according to actual requirements, including vector control and direct torque control, so that accurate matching of the power output of the generator and load power requirements is ensured; by detecting the influence state of each variable factor of motor operation in the vector control module and performing precision correction control on the voltage component in the corresponding voltage equation of the d-q rotating coordinate system, the precision control on each variable in the motor can be realized, and the efficiency and the stability of the generator can be improved.

Description

Technical Field

[0001] The invention belongs to the technical field of electric power output control of motors and relates to a silent permanent magnet generator control system. Background Art

[0002] In today's power industry, silent permanent magnet generators have been widely used in many application scenarios due to their high efficiency, energy saving, and environmental protection, such as data centers, scientific research laboratories, and other places with high requirements for noise and power stability. However, with the continuous improvement of power quality and generator performance requirements, the existing technology has gradually exposed some significant limitations in the power output control of silent permanent magnet generators. These problems have seriously restricted the performance optimization and wider application of the generator, prompting us to devote ourselves to the development of a more advanced silent permanent magnet generator control system.

[0003] The limitations of power output control in the prior art include: 1. When selecting a power output control method, the prior art may lack the definition of information entropy for the generator power output, resulting in a lack of accuracy in the prediction of power output demand, which in turn leads to a mismatch between the selected control method and actual demand.

[0004] 2. When performing power output control, the existing technology mainly analyzes the fluctuation defects of the overall voltage parameters of the motor and makes overall voltage corrections based on this, ignoring the specific performance of the voltage in different components. The fluctuation analysis of the overall voltage parameters often cannot accurately reflect the specific changes of the voltage in the excitation current component and the torque component, so it is difficult to make targeted corrections. Summary of the invention

[0005] In view of this, in order to solve the problems raised in the above background technology, a silent permanent magnet generator control system is now proposed.

[0006] The purpose of the present invention can be achieved through the following technical solutions: The present invention provides a silent permanent magnet generator control system, which includes: a parameter acquisition module: used to obtain the motor load condition, the motor load condition includes the load degree of each load of the motor during the historical cycle operation process and the load degree of the motor during the future cycle operation, where each load is numbered 1, 2, ...i..., n.

[0007] Working condition demand analysis module: used to evaluate the power output demand of the generator in the future cycle operation according to the motor load working condition, and then compare the power output demand of the generator in the future cycle operation with the preset power output demand limit. When the power output demand of the generator in the future cycle operation exceeds the preset power output demand limit, the vector control module is selected, otherwise the direct torque control module is selected.

[0008] Vector control module: used to detect the influence of various variable factors in the operation of the motor, and to perform precision correction control on the voltage component in the corresponding voltage equation of the dq rotating coordinate system. The variable factors include temperature variable, magnetic saturation variable, power supply variable, and load variable.

[0009] Direct torque control module: used to obtain the speed feedback signal through the speed sensor installed on the motor shaft, and then set the speed control parameters based on the speed feedback signal.

[0010] Compared with the prior art, the present invention has the following beneficial effects: (1) The present invention obtains the load conditions of the motor during its historical cycle operation and defines the information entropy of the motor load data set, thereby reflecting the corresponding complexity and uncertainty of the load changes during the motor operation process, and then predicts and evaluates the power output demand of the generator in the future cycle operation, providing a scientific basis for the power output scheduling management of the generator.

[0011] (2) The present invention predicts the power output demand of the generator in future cycles and selects an appropriate control method for the power output according to actual demand, including vector control and direct torque control, thereby ensuring that the power output of the generator is accurately matched with the power demand of the load and reducing unnecessary energy waste.

[0012] (3) The present invention detects the influence state of various variable factors on the operation of the motor in the vector control module, and performs precision correction control on the voltage component in the corresponding voltage equation of the dq rotating coordinate system, thereby achieving precise control over the various variables inside the motor, helping to improve the efficiency and stability of the generator, and making the power output more stable and reliable. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings required for describing the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without paying creative work.

[0014] Figure 1 This is a schematic diagram of the connection of the system modules of the present invention.

[0015] Figure 2 It is a schematic diagram of the corresponding flow chart of the vector control module of the present invention. DETAILED DESCRIPTION

[0016] 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.

[0017] See also Figure 1 As shown, the present invention provides a silent permanent magnet generator control system, which includes: a parameter acquisition module, a working condition demand analysis module, a vector control module, and a direct torque control module.

[0018] The parameter acquisition module is connected to the operating condition demand analysis module, and the operating condition demand analysis module is respectively connected to the vector control module and the direct torque control module.

[0019] The parameter acquisition module is used to acquire the motor load condition, which includes the load degree of each load of the motor during the historical cycle operation process and the load degree of the motor during the future cycle operation, wherein each load is numbered 1, 2, ..., i..., n.

[0020] The operating condition demand analysis module is used to evaluate the power output demand of the generator in the future cycle operation according to the motor load condition, and then compare the power output demand of the generator in the future cycle operation with the preset power output demand limit. When the power output demand of the generator in the future cycle operation exceeds the preset power output demand limit, the vector control module is selected, otherwise the direct torque control module is selected.

[0021] In a preferred embodiment, the power output demand of the generator in the future periodic operation is evaluated according to the motor load condition, including: identifying the load degree χi, the start time, and the load level of the motor in each historical periodic operation process from the motor load condition. and stop time Analyze the start and stop frequency of each load Δt represents the preset reference interval duration. The load level and start-stop frequency of each load are taken as the motor load data set (D1, D2), and then the load level χ in the motor load data set is obtained. i and the probability of occurrence of the start-stop frequency yi, denoted as p(χ i )、p(y i ).

[0022] The information entropy of the motor load dataset is defined as

[0023]

[0024] Compare the load level of the motor in the future cycle with the preset basic power output requirements to obtain the basic power output requirement D of the motor in the future cycle. 0 , based on which the power output demand of the generator in the future cycle operation is evaluated D = D 0 +E*H(D1+D2), where E represents the influence coefficient of preset information entropy on additional power demand.

[0025] Specifically, the information entropy of the motor load data set mainly quantifies the uncertainty and complexity of the motor load pattern. If the information entropy of the motor load data set is high, it means that the load change is highly random and unpredictable. In this case, in order to meet the ever-changing needs, the motor control system needs to have stronger adaptability and more flexible adjustment mechanisms. On the contrary, if the information entropy is low, it means that the load is relatively stable, and the change pattern is relatively simple and predictable. At this time, the motor can adopt a more fixed control strategy to meet the power output demand.

[0026] The present invention obtains the load conditions of the motor in the historical cycle operation process, constructs a motor load data set belonging to the load degree and start-stop frequency, and defines the information entropy of the motor load data set, thereby reflecting the corresponding complexity and uncertainty of the load changes in the motor operation process, and then predicts and evaluates the power output demand of the generator in the future cycle operation, providing a scientific basis for the power output scheduling management of the generator.

[0027] The vector control module is used to detect the influence state of various variable factors in the operation of the motor, and to perform precision correction control on the voltage component in the corresponding voltage equation of the dq rotating coordinate system. The various variable factors include temperature variables, magnetic saturation variables, power supply variables, and load variables.

[0028] The basic concept of the dq rotating coordinate system is that the d-axis is usually defined as a direction consistent with the magnetic flux direction of the rotor permanent magnet, or in an induction motor, consistent with the magnetic flux direction generated by the excitation current; the q-axis is a direction perpendicular to the d-axis, usually corresponding to the current component that generates torque.

[0029] In a preferred embodiment, the voltage equation corresponding to the dq rotating coordinate system is expressed as follows: The initial parameters of the generator are set, including the stator resistance Rs, the d-axis inductance Ld and the q-axis inductance Lq, the electrical angular velocity ωe of the motor, and the back electromotive force E generated by the permanent magnet. f .

[0030] The power output demand of the generator in the future periodic operation is matched with the corresponding preset current components of the dq rotating coordinate system to obtain the current components Id and Iq of the d-axis and q-axis.

[0031] The d-axis current component and q-axis current component of the motor at each time point corresponding to each load in the historical cycle operation process are obtained, and a series of transient change rates of the d-axis and q-axis current components corresponding to each load in the historical cycle operation process of the motor are obtained by calculating the difference between the current components between adjacent time points and the time length ratio. The corresponding transient change rates of the d-axis and q-axis current components of the load degree of each load are obtained by average calculation.

[0032] The corresponding transient change rate of the current component of the d-axis and q-axis of the load level of each load is matched with the load level of the motor in the future cycle, and the load level with the smallest difference between the load level of each load and the load level of the future cycle is obtained, and the corresponding transient change rate of the current component of the d-axis and q-axis to which it belongs is obtained, which is recorded as the corresponding transient change rate of the current component of the d-axis and q-axis of the load level of the motor in the future cycle

[0033] Calculate the d-axis voltage component in the corresponding voltage equation of the dq rotating coordinate system and the q-axis voltage component

[0034] See also Figure 2 As shown, in a further preferred embodiment, the corresponding process of the vector control module includes: A1, detecting the value of the corresponding compensation item of each variable factor in the corresponding voltage equation of the dq rotating coordinate system, the value of the corresponding compensation item of each variable factor includes the value of the corresponding output power compensation item of the power supply variable, the value of the corresponding stator resistance compensation item of the temperature variable, the value of the corresponding inductance compensation item of the magnetic saturation variable, and the value of the corresponding torque compensation item of the load variable.

[0035] The value of the torque compensation item corresponding to the load variable includes: installing a torque sensor on the motor shaft to obtain the torque in real time, extracting the torque of each load of the motor shaft during the historical cycle operation process, comparing it with the torque given by the corresponding load in the motor control algorithm, and obtaining the torque deviation of each load of the motor shaft during the historical cycle operation process, and then taking the average value as the value of the torque compensation item corresponding to the load variable.

[0036] A2. Parameterize and compare the values ​​of the corresponding compensation items of each variable factor to determine the values ​​of the corresponding compensation items of the key variable factor.

[0037] Furthermore, when the value of the torque compensation item corresponding to the load variable is the value of the compensation item corresponding to the key variable factor, the value of the torque compensation item corresponding to the load variable is used as the motor power output control value, which is regulated to improve the power control accuracy of the motor.

[0038] A3. Match the value of the corresponding compensation item of the key variable factor with the control amplitude and control phase of the d-axis and q-axis components to which the preset corresponding compensation item belongs, and obtain the control amplitude and control phase of the d-axis and q-axis components to which the corresponding compensation item of the key variable factor belongs, and then control them to achieve the effect of precision control of the d-axis voltage component and the q-axis voltage component in the corresponding voltage equation of the dq rotating coordinate system.

[0039] In a further preferred embodiment, the value of the output power compensation item corresponding to the power supply variable includes: real-time monitoring of the power supply voltage and current of each load of the motor during the historical cycle operation process through sensors, taking the neutral operation moment of each load as the monitoring moment, and obtaining the corresponding instantaneous output power of the motor at the monitoring moment of each load during the historical cycle operation process.

[0040] The neutral operation time refers to the middle time between the start time and the stop time of the load.

[0041] The load degree of each load during the historical cycle operation of the motor is matched with the expected output power corresponding to each preset load degree, and the expected output power of each load during the historical cycle operation of the motor is obtained. It is compared with the corresponding instantaneous output power at the monitoring moment of the corresponding load to obtain a series of output power deviations, and then the value of the output power compensation item is obtained by average calculation.

[0042] In a further preferred embodiment, the temperature variable corresponds to the value of the stator resistance compensation term, including: obtaining the real-time temperature through a temperature sensor installed near the motor winding, extracting the temperature T2 of each load of the motor winding during the historical cycle operation process i , and subtract it from the preset suitable temperature of the motor winding to obtain the temperature change ΔTi of the motor winding at each load during the historical cycle operation process.

[0043] The room temperature T1 is obtained through the temperature sensor, and the resistance value R1 of the motor winding at room temperature is extracted, and the resistance value R2 of the motor winding at each load temperature during the historical cycle operation process is extracted i , and then calculate the resistance temperature coefficient of the motor winding at each load during the historical cycle operation according to the formula

[0044] For the stator resistance Rs in the motor d-axis voltage equation, when the temperature changes and causes Rs to increase, the value of the stator resistance compensation term is calculated as Where n represents the number of load times during the historical cycle operation.

[0045] Furthermore, when the value of the stator resistance compensation term corresponding to the temperature variable is the value of the compensation term corresponding to the key variable factor, R′s is substituted into the motor d-axis voltage equation, that is, The required d-axis voltage U′d is calculated from this; the required q-axis voltage is calculated similarly Thereby improving the power control accuracy of the motor.

[0046] The motor winding is a part of the motor stator, and is composed of coils of wires wound around the stator. The stator resistance refers to the resistance generated by the stator winding, and is an important parameter of the motor.

[0047] In a further preferred embodiment, the value of the inductance compensation item corresponding to the magnetic saturation variable includes: establishing a magnetization curve corresponding to the motor rotor position, and quantifying the magnetic saturation degree coefficient by comparing the magnetization intensity of the magnetic saturation point in the magnetization curve with the theoretical saturation magnetization intensity.

[0048] The theoretical saturation magnetization is the maximum possible magnetization.

[0049] The magnetic field distribution of the motor under each load condition in the historical cycle operation process is obtained through simulation calculation. According to the magnetic field distribution and the law of electromagnetic induction, the inductance values ​​of the d-axis and q-axis under each load condition are calculated, and the magnetic saturation coefficient of the d-axis and q-axis under each load condition is obtained by quantifying the magnetic saturation coefficient.

[0050] A mathematical fitting method (such as polynomial fitting, exponential fitting, etc.) is used to fit the inductance values ​​of the d-axis and q-axis under each load condition as the dependent variable and the magnetic saturation coefficient as the independent variable, and a relationship function between the corresponding inductance values ​​of the d-axis and q-axis and the magnetic saturation coefficient is established.

[0051] The corresponding magnetic saturation coefficients of the d-axis and q-axis of the motor rotor position at the detection moment are obtained, and substituted into the relationship function between the corresponding axis inductance and the magnetic saturation coefficient to obtain the matching inductance value, which is recorded as the value of the corresponding inductance compensation item of the d-axis and q-axis.

[0052] Furthermore, when the value of the inductance compensation item corresponding to the magnetic saturation variable is the value of the compensation item corresponding to the key variable factor, the value of the inductance compensation item is substituted into the motor d-axis voltage equation according to the corresponding substitution method of the stator resistance compensation item, and then real-time inductance compensation is performed in the dq-axis voltage equation.

[0053] In a further preferred embodiment, the establishment of the corresponding magnetization curve of the motor rotor position is specifically as follows: by using a hysteresis loop instrument device to collect the magnetization intensity data of the magnetic material corresponding to the motor rotor position under the magnetic field intensity of each load in the historical cycle operation process, the magnetization intensity is used as the vertical coordinate and the magnetic field intensity is used as the horizontal coordinate to draw a magnetization curve, that is, a curve showing the change of the magnetization intensity (M) with the magnetic field intensity (H) of each load.

[0054] Use appropriate mathematical functions (such as polynomials, exponential functions, etc.) to fit the magnetization curve to obtain the mathematical relationship between the magnetization intensity and the magnetic field intensity, and locate the magnetic saturation point on the magnetization curve, that is, the point where the magnetization intensity no longer increases significantly with the magnetic field intensity. This point corresponds to the state where the magnetic moments in the material are almost all directional.

[0055] In a further preferred embodiment, the value of the corresponding compensation item of the key variable factor is determined by constructing the value of the corresponding compensation item of each variable factor as a normalized parameter index, such as the value of the output power compensation item corresponding parameter index The corresponding parameter index of the stator resistance compensation item The corresponding parameter index of the value of the corresponding inductance compensation item of the d-axis and q-axis The value of the torque compensation item corresponds to the parameter index Compare them with each other and filter out the maximum value. The variable factor to which it belongs is the key variable factor, and e is a natural constant.

[0056] The P comp represents the value of the output power compensation term, L′d and L′q represent the values ​​of the corresponding inductance compensation terms of the d-axis and q-axis respectively, and T comp represents the value of the torque compensation term, T 0 They respectively represent the output power compensation item, the stator resistance compensation item, the corresponding inductance compensation items of the d-axis and q-axis, and the corresponding preset reference values ​​of the torque compensation item.

[0057] The present invention detects the influence state of various variable factors on the operation of the motor in the vector control module, and performs precision correction control on the voltage component in the corresponding voltage equation of the dq rotating coordinate system, so as to achieve precise control of various variables inside the motor, help improve the efficiency and stability of the generator, and make the power output more stable and reliable.

[0058] The direct torque control module is used to obtain a speed feedback signal through a speed sensor installed on the motor shaft, and then set a speed control parameter based on the speed feedback signal.

[0059] In a preferred embodiment, the speed control parameters are set based on the speed feedback signal, including: installing a high-precision speed sensor on the motor shaft to monitor the speed of the motor in real time, converting it into an electrical signal, and transmitting it to a direct torque control module, and the direct torque control module preprocesses the received electrical signal to obtain an accurate speed feedback signal.

[0060] The speed sensor may be a Hall sensor, a photoelectric encoder or a magnetoelectric sensor, etc. The specific selection depends on the type of motor and the application scenario.

[0061] The pre-processing refers to filtering, amplification and digitization.

[0062] According to the rated speed of the motor 0 And the power output demand D of the generator in the future cycle operation, set the reference speed value ω′ 0 Indicates the preset speed corresponding safety margin.

[0063] The speed feedback signal is compared with the reference speed value to calculate the speed deviation, and then the coefficient parameters of the PI controller are set according to the size and change trend of the speed deviation.

[0064] The coefficient parameters of the PI controller are such as the proportional coefficient (Kp) and the integral coefficient (Ki). For example, when the speed deviation of the motor shaft at each load during the historical cycle operation exceeds the specified deviation value, the speed regulation speed is accelerated by increasing the proportional coefficient of the PI controller.

[0065] The proportional coefficient determines the response speed and amplification degree of the controller to the speed deviation; the integral coefficient is used to eliminate static error and improve the steady-state accuracy of the system.

[0066] The present invention predicts the power output demand of the generator in future cycles and selects an appropriate control method for the power output according to actual demand, including vector control and direct torque control, to ensure that the power output of the generator is accurately matched with the power demand of the load and reduce unnecessary energy waste.

[0067] The above contents are merely examples and explanations of the concept of the present invention. Those skilled in the art may make various modifications or additions to the specific embodiments described or replace them in a similar manner. As long as they do not deviate from the concept of the invention or exceed the scope defined by the present invention, they shall all fall within the protection scope of the present invention.

Claims

1. A silent permanent magnet generator control system, characterized in that: The system includes: Parameter acquisition module: used to obtain the motor load condition, wherein the motor load condition includes the load degree of each load of the motor in the historical cycle operation process and the load degree of the motor in the future cycle operation, wherein each load is numbered 1, 2, ...i..., n; Working condition demand analysis module: used to evaluate the power output demand of the generator in the future cycle operation according to the motor load working condition, and then compare the power output demand of the generator in the future cycle operation with the preset power output demand limit. When the power output demand of the generator in the future cycle operation exceeds the preset power output demand limit, the vector control module is selected, otherwise the direct torque control module is selected; Vector control module: used to detect the influence of various variable factors in the operation of the motor, and to perform precision correction control on the voltage component in the corresponding voltage equation of the dq rotating coordinate system. The variable factors include temperature variable, magnetic saturation variable, power supply variable, and load variable. Direct torque control module: used to obtain the speed feedback signal through the speed sensor installed on the motor shaft, and then set the speed control parameters based on the speed feedback signal.

2. A silent permanent magnet generator control system according to claim 1, characterized in that: The evaluation of the power output demand of the generator for future periodic operation according to the motor load condition includes: Identify the load level χi, start time and stop time of each load in the historical cycle operation process from the motor load condition, and analyze the corresponding start and stop frequency y of each load i , the load level and start-stop frequency of each load are taken as the motor load data set (D1, D2), and then the probability of the load level χi and start-stop frequency yi in the motor load data set is obtained, which is recorded as p(χ i )、p(y i ); The information entropy of the motor load dataset is defined as The load level of the motor in the future cycle is compared with the preset basic power output demands to obtain the basic power output demand D0 of the motor in the future cycle. Based on this, the power output demand of the generator in the future cycle is evaluated D=D0+E*H(D1+D2), where E represents the influence coefficient of the preset information entropy on the additional power demand.

3. A silent permanent magnet generator control system according to claim 1, characterized in that: The corresponding voltage equation of the dq rotating coordinate system is expressed as: Set the initial parameters of the generator, including stator resistance Rs, d-axis inductance Ld and q-axis inductance Lq, electrical angular velocity ωe of the motor, back electromotive force E generated by the permanent magnet f ; Match the power output demand of the generator in the future periodic operation with the corresponding preset current components of the dq rotating coordinate system to obtain the current components Id and Iq of the d-axis and q-axis; Obtain the d-axis current component and the q-axis current component of the motor at each time point corresponding to each load during the historical cycle operation process, and calculate the corresponding transient change rate of the d-axis and q-axis current components of the load level of each load; The corresponding transient change rate of the current component of the d-axis and q-axis of the load level of each load is matched with the load level of the motor in the future cycle, and the load level with the smallest difference between the load level of each load and the load level of the future cycle is obtained, and the corresponding transient change rate of the current component of the d-axis and q-axis to which it belongs is obtained, which is recorded as the corresponding transient change rate of the current component of the d-axis and q-axis of the load level of the motor in the future cycle Calculate the d-axis voltage component in the corresponding voltage equation of the dq rotating coordinate system and the q-axis voltage component 4. A silent permanent magnet generator control system according to claim 3, characterized in that: The corresponding process of the vector control module includes: A1. Detect the value of the corresponding compensation item of each variable factor in the corresponding voltage equation of the dq rotating coordinate system. The value of the corresponding compensation item of each variable factor includes the value of the corresponding output power compensation item of the power supply variable, the value of the corresponding stator resistance compensation item of the temperature variable, the value of the corresponding inductance compensation item of the magnetic saturation variable, and the value of the corresponding torque compensation item of the load variable; A2. Parameterize and compare the values ​​of the corresponding compensation items of each variable factor to determine the values ​​of the corresponding compensation items of the key variable factor; A3. Match the value of the corresponding compensation item of the key variable factor with the control amplitude and control phase of the d-axis and q-axis components to which the preset corresponding compensation item belongs, and obtain the control amplitude and control phase of the d-axis and q-axis components to which the corresponding compensation item of the key variable factor belongs, and then control them to achieve the effect of precision control of the d-axis voltage component and the q-axis voltage component in the corresponding voltage equation of the dq rotating coordinate system.

5. A silent permanent magnet generator control system according to claim 4, characterized in that: The value of the output power compensation item corresponding to the power supply variable includes: The power supply voltage and current of each load of the motor during the historical cycle operation are monitored in real time by sensors, and the corresponding instantaneous output power of the motor at each load monitoring time during the historical cycle operation is obtained by taking the neutral operation time of each load as the monitoring time; The load degree of each load during the historical cycle operation of the motor is matched with the expected output power corresponding to each preset load degree, and the expected output power of each load during the historical cycle operation of the motor is obtained. It is compared with the corresponding instantaneous output power at the monitoring moment of the corresponding load to obtain a series of output power deviations, and then the value of the output power compensation item is obtained by average calculation.

6. A silent permanent magnet generator control system according to claim 4, characterized in that: The value of the stator resistance compensation item corresponding to the temperature variable includes: The real-time temperature is obtained by installing a temperature sensor near the motor winding, and the temperature T2 of each load of the motor winding during the historical cycle operation is extracted. i , and subtract it from the preset suitable temperature of the motor winding to obtain the temperature change ΔT of the motor winding at each load during the historical cycle operation process i ; The room temperature T1 is obtained through the temperature sensor, and the resistance value R1 of the motor winding at room temperature is extracted, and the resistance value R2 of the motor winding at each load temperature during the historical cycle operation process is extracted i , and then calculate the resistance temperature coefficient of the motor winding at each load during the historical cycle operation according to the formula For the stator resistance Rs in the motor d-axis voltage equation, the value of the stator resistance compensation term is calculated as Where n represents the number of load times during the historical cycle operation.

7. A silent permanent magnet generator control system according to claim 4, characterized in that: The value of the inductance compensation item corresponding to the magnetic saturation variable includes: Establishing the magnetization curve corresponding to the motor rotor position, and quantifying the magnetic saturation degree coefficient by comparing the magnetization intensity at the magnetic saturation point in the magnetization curve with the theoretical saturation magnetization intensity; The magnetic field distribution of the motor under each load condition during the historical cycle operation is obtained through simulation calculation. According to the magnetic field distribution and the law of electromagnetic induction, the inductance values ​​of the d-axis and q-axis under each load condition are calculated, and the magnetic saturation coefficient of the d-axis and q-axis under each load condition is obtained through the quantification method of the magnetic saturation coefficient. The inductance values ​​of the d-axis and q-axis under each load condition are taken as dependent variables and the magnetic saturation coefficient is taken as an independent variable by using a mathematical fitting method to fit and establish a relationship function between the corresponding inductance values ​​of the d-axis and q-axis and the magnetic saturation coefficient; The corresponding magnetic saturation coefficients of the d-axis and q-axis of the motor rotor position at the detection moment are obtained, and substituted into the relationship function between the corresponding axis inductance and the magnetic saturation coefficient to obtain the matching inductance value, which is recorded as the value of the corresponding inductance compensation item of the d-axis and q-axis.

8. A silent permanent magnet generator control system according to claim 7, characterized in that: The establishment of the corresponding magnetization curve of the motor rotor position is specifically as follows: The magnetization intensity data of the magnetic material corresponding to the motor rotor position under the magnetic field intensity of each load in the historical cycle operation process are collected by using the hysteresis loop instrument equipment, and the magnetization intensity is used as the ordinate and the magnetic field intensity is used as the abscissa to draw a magnetization curve; The magnetization curve is fitted using a suitable mathematical function to obtain the mathematical relationship between the magnetization intensity and the magnetic field intensity, and the magnetic saturation point is located on the magnetization curve.

9. A silent permanent magnet generator control system according to claim 7, characterized in that: The method of determining the values ​​of the corresponding compensation items of the key variable factors is as follows: constructing the values ​​of the corresponding compensation items of each variable factor into normalized parameter indicators, such as the value corresponding parameter indicator of the output power compensation item, the value corresponding parameter indicator of the stator resistance compensation item, the value corresponding parameter indicator of the d-axis and q-axis corresponding inductance compensation items, and the value corresponding parameter indicator of the torque compensation item, and comparing them with each other to select the maximum value, and the variable factor to which it belongs is the key variable factor.

10. A silent permanent magnet generator control system according to claim 1, characterized in that: The speed control parameter is set based on the speed feedback signal, including: A high-precision speed sensor is installed on the motor shaft to monitor the motor speed in real time, convert it into an electrical signal, and transmit it to the direct torque control module. The direct torque control module pre-processes the received electrical signal to obtain an accurate speed feedback signal; The reference speed value is set according to the rated speed of the motor and the power output demand of the generator in the future cycle operation; The speed feedback signal is compared with the reference speed value to calculate the speed deviation, and then the coefficient parameters of the PI controller are set according to the size and change trend of the speed deviation.

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