Parameter-free identification high-voltage permanent magnet synchronous motor loading control method and system

Abstract

The invention discloses a parameter-free identification high-voltage permanent magnet synchronous motor loading control method and system. The method comprises the following steps: acquiring three-phase current and three-phase voltage output by a high-voltage frequency converter; performing coordinate transformation calculation analysis on the three-phase current and the three-phase voltage to obtain feedback reactive power; obtaining a corresponding d-axis voltage and a q-axis voltage according to a difference value between the feedback reactive power and the given reactive power and a voltage formed through V / F operation; and converting the d-axis voltage and the q-axis voltage to obtain a corresponding updated three-phase voltage, modulating the three-phase voltage, and outputting the modulated three-phase voltage to the high-voltage permanent magnet synchronous motor to realize loading control of the high-voltage permanent magnet synchronous motor. According to the method, parameter identification is not needed, and the counter-supporting loading of the high-voltage permanent magnet synchronous motor is directly controlled by controlling the constant reactive power, so that the method is simpler and more convenient, the test operation is greatly facilitated, and the loading test efficiency is improved.

Description

Technical Field

[0001] The present application relates to the technical field of motor loading test, and in particular to a method and system for controlling high-voltage permanent magnet synchronous motor loading without parameter identification. Background Art

[0002] With the development of the economy, high-voltage motor equipment is increasingly used in industry to achieve the conversion between electrical energy and mechanical energy.

[0003] After manufacturing, high-voltage motors must undergo a loading test before leaving the factory. This test typically involves connecting two high-voltage motors via flanges and using two high-voltage inverters to drive the motors.

[0004] Early motors were mostly asynchronous motors. After a high-voltage inverter was powered on, V / F (voltage / frequency) control was often used to drive the motor's slip, thereby achieving motor loading. With the advent of high-voltage permanent magnet synchronous motors, factory loading tests for these motors have become an essential step.

[0005] The existing high-voltage permanent magnet synchronous motor loading factory test has the following shortcomings: First, when the high-voltage inverter is driving the high-voltage permanent magnet synchronous motor, parameter identification must be performed before loading can be performed. If the parameter identification is not accurate, the parameter identification results must be corrected. This process is relatively cumbersome, which brings great inconvenience to the factory loading test of the high-voltage motor and affects the efficiency of the factory test of the high-voltage motor. Second, the size and power of high-voltage permanent magnet synchronous motors vary greatly. This requires the high-voltage inverter to accurately control the power of the high-voltage motor during the loading test. However, for general test stations, they may only purchase a large high-voltage inverter for loading factory tests of various types of high-voltage motors. This poses a challenge to the control accuracy and control performance of the high-voltage inverter. In particular, when using a large high-voltage inverter to drive a low-power high-voltage motor, unstable control may make it impossible to complete the loading. Summary of the Invention

[0006] The embodiments of the present application provide a parameter-free high-voltage permanent magnet synchronous motor loading control method and system to solve the problems that the existing high-voltage permanent magnet synchronous motor loading factory test requires parameter identification, the process is cumbersome, the efficiency is low, and it cannot cope with high-voltage motors of different power and has low control accuracy.

[0007] The present application provides a method for controlling a high-voltage permanent magnet synchronous motor loading without parameter identification, the method comprising: Collect the three-phase current and three-phase voltage output by the high-voltage inverter; Performing coordinate transformation calculation and analysis on the three-phase current and three-phase voltage to obtain feedback reactive power; According to the difference between the feedback reactive power and the given reactive power, and the voltage formed by the V / F operation, the corresponding d-axis voltage and q-axis voltage are obtained; The d-axis voltage and the q-axis voltage are converted to obtain corresponding updated three-phase voltages, which are modulated and output to the high-voltage permanent magnet synchronous motor to achieve loading control of the high-voltage permanent magnet synchronous motor.

[0008] In one example, performing coordinate transformation calculation and analysis on the three-phase current and three-phase voltage to obtain feedback reactive power specifically includes: Performing coordinate transformation on the three-phase current and the three-phase voltage to obtain corresponding d-axis current, q-axis current, d-axis voltage and q-axis voltage; A vector cross product operation is performed on the d-axis current, the q-axis current, the d-axis voltage, and the q-axis voltage to obtain feedback reactive power.

[0009] In one example, the coordinate transformation includes Clark transformation and Park transformation.

[0010] In one example, performing a vector cross product operation on the d-axis current, the q-axis current, the d-axis voltage, and the q-axis voltage to obtain the feedback reactive power specifically includes: The product of the d-axis current and the q-axis voltage and the product of the q-axis current and the d-axis voltage are added together to obtain feedback reactive power.

[0011] In one example, obtaining the corresponding d-axis voltage and q-axis voltage according to the difference between the feedback reactive power and the given reactive power and the voltage formed by the V / F operation specifically includes: According to the difference between the feedback reactive power and the given reactive power, the corresponding d-axis voltage is obtained through a PI regulator; The d-axis voltage is added to the voltage formed by V / F operation to obtain the corresponding q-axis voltage.

[0012] In one example, the modulated output to the high-voltage permanent magnet synchronous motor specifically includes: Performing carrier phase-shift PWM modulation on the updated three-phase voltage to form a corresponding wave signal; The wave signal is sent to the cascaded power unit in the high-voltage inverter, and the corresponding voltage is output to the high-voltage permanent magnet synchronous motor.

[0013] In one example, before collecting the three-phase current and three-phase voltage output by the high-voltage inverter, the method further includes: Perform multi-channel current sampling through different current sampling loops; wherein each current sampling loop corresponds to a sampling accuracy of currents of different size ranges; Selecting a current sampling loop that matches the multiple current values ​​according to the multiple current values ​​collected by the multi-channel current sampling and the size range corresponding to each current sampling loop; The current value corresponding to the selected current sampling loop is used as the three-phase current value with the highest accuracy in the multi-channel current sampling and is output.

[0014] In one example, before collecting the three-phase current and three-phase voltage output by the high-voltage inverter, the method further includes: According to the maximum rated current of the high-voltage inverter, a plurality of current sampling loops with different size ranges are divided; wherein the size ranges corresponding to the current sampling loops do not overlap.

[0015] The embodiment of the present application provides a high-voltage permanent magnet synchronous motor loading control system without parameter identification, which is based on any of the above-mentioned high-voltage permanent magnet synchronous motor loading control methods without parameter identification. The system includes: Acquisition module, used to collect the three-phase current and three-phase voltage output by the high-voltage inverter; A reactive power analysis module is used to perform coordinate conversion calculation and analysis on the three-phase current and three-phase voltage to obtain feedback reactive power; a calculation module, configured to obtain corresponding d-axis voltage and q-axis voltage according to the difference between the feedback reactive power and the given reactive power and the voltage formed by V / F operation; The dq-abc conversion module is used to convert the d-axis voltage and the q-axis voltage to obtain the corresponding updated three-phase voltage, which is output to the high-voltage permanent magnet synchronous motor after modulation to achieve loading control of the high-voltage permanent magnet synchronous motor.

[0016] In one example, the system further includes a multi-channel current sampling circuit and an automatic selection module; The automatic selection module is configured to perform multi-channel current sampling through different current sampling loops, wherein each current sampling loop corresponds to a sampling accuracy of currents in different ranges, and based on multiple current values ​​collected by the multi-channel current sampling and the ranges corresponding to each current sampling loop, a current sampling loop matching the multiple current values ​​is selected, and the current value corresponding to the selected current sampling loop is used as the three-phase current value with the highest accuracy in the multi-channel current sampling and output.

[0017] The present invention provides a method and system for controlling the loading of a high-voltage permanent magnet synchronous motor without parameter identification, which can achieve the following beneficial effects: When performing loading tests on high-voltage permanent magnet synchronous motors, a high-voltage inverter eliminates the need for parameter identification. Instead, reactive power calculation and analysis are used to maintain a constant reactive power, directly controlling the motor's load. This simplifies and streamlines testing, greatly facilitating test operations and improving loading test efficiency. Furthermore, by pre-setting multiple current sampling circuits with varying sampling accuracy for different current levels, the system automatically switches current sampling circuits based on the output current, selecting the most accurate one. This ensures high current sampling accuracy and allows the use of a single, larger high-voltage inverter to perform loading tests on high-voltage permanent magnet synchronous motors of varying power levels, enhancing loading test versatility and reducing costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following briefly introduces the drawings required for the embodiments or the description of the prior art. The drawings described here are used to provide a further understanding of the present application and constitute a part of the present application. The illustrative embodiments of the present application and their descriptions are used to explain the present application and do not constitute an improper limitation on the present application. In the drawings: Figure 1 A flow chart of a method for controlling high-voltage permanent magnet synchronous motor loading without parameter identification according to an embodiment of the present application; Figure 2 Schematic diagram of reactive power analysis principle provided in the embodiment of the present application; Figure 3 A schematic diagram of automatic selection of multiple current sampling loops provided in an embodiment of the present application; Figure 4 A schematic structural diagram of a high-voltage permanent magnet synchronous motor loading control system without parameter identification provided in an embodiment of the present application; Figure 5 A schematic structural diagram of another high-voltage permanent magnet synchronous motor loading control system without parameter identification provided in an embodiment of the present application. DETAILED DESCRIPTION

[0019] To make the purpose, technical solutions, and advantages of this application more clear, the technical solutions of this application will be clearly and completely described below in conjunction with the specific embodiments of this application and the corresponding drawings. Obviously, the embodiments described are only part of the embodiments of this application, not all of them. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0020] Figure 1 The flow chart of the method for controlling the loading of a high-voltage permanent magnet synchronous motor without parameter identification provided in the embodiment of the present application includes the following steps: S101: Collect the three-phase current and three-phase voltage output by the high-voltage inverter.

[0021] In the embodiment of the present application, the high-voltage inverter needs to collect the output three-phase current and three-phase voltage to perform reactive power analysis.

[0022] S102: performing coordinate transformation calculation and analysis on the three-phase current and three-phase voltage to obtain feedback reactive power.

[0023] In an embodiment of the present application, the feedback reactive power is obtained by calculating and analyzing the three-phase current and three-phase voltage. The feedback reactive power represents the current real-time reactive power corresponding to the current real-time three-phase current and three-phase voltage, and changes with the changes in the three-phase current and three-phase voltage.

[0024] Specifically, coordinate transformation calculation and analysis are performed on the three-phase current and the three-phase voltage to obtain the feedback reactive power, which specifically includes: performing coordinate transformation on the three-phase current and the three-phase voltage respectively to obtain the corresponding d-axis current, q-axis current and d-axis voltage, q-axis voltage; performing vector cross product operation on the d-axis current, q-axis current, d-axis voltage, and q-axis voltage to obtain the feedback reactive power.

[0025] Furthermore, a vector cross product operation is performed on the d-axis current, q-axis current, d-axis voltage, and q-axis voltage to obtain feedback reactive power, specifically including: adding the product of the d-axis current and the q-axis voltage, and the product of the q-axis current and the d-axis voltage to obtain feedback reactive power.

[0026] That is to say, the formula Q=U d *I q +U q *I d The feedback reactive power is calculated, where Q represents reactive power and U d Indicates the d-axis voltage, U q represents the q-axis voltage, I d Indicates the d-axis current, I q represents the q-axis current.

[0027] Furthermore, when performing coordinate transformation on three-phase current and three-phase voltage, the available coordinate transformation methods include Clark Transformation and Park Transformation. Clark Transformation and Park Transformation are core mathematical tools for coordinate transformation in motor control. Their combined use enables decoupled control of AC motors. The Clark Transformation converts the three-phase stationary coordinate system (abc) into a two-phase stationary coordinate system (αβ), achieving system dimensionality reduction. The Park Transformation then converts the two-phase stationary coordinate system (αβ) into a two-phase rotating coordinate system (dq), achieving conversion of AC quantities to DC quantities.

[0028] like Figure 2 As shown, the three-phase current i output by the high-voltage inverter is collected. a 、i b 、i c , through Clark and Park transformation, the current in the three-phase coordinate system is converted into the current I in the rotating coordinate system d and I q . Collect the three-phase voltage u output by the high-voltage inverter a * 、u b * 、u c * , through Clark and Park transformation, the voltage in the three-phase coordinate system is converted to the voltage U in the rotating coordinate system d and U q . Take the vector cross product of voltage and current, that is, Q=U d *I q +U q *I d , and get the feedback reactive power. Under the condition of constant frequency, the reactive power can be controlled to control the stable operation of the high-voltage permanent magnet synchronous motor.

[0029] S103: Obtain corresponding d-axis voltage and q-axis voltage according to the difference between the feedback reactive power and the given reactive power, and the voltage formed by the V / F operation.

[0030] In an embodiment of the present application, the control of the high-voltage permanent magnet synchronous motor is achieved by controlling the reactive power of the high-voltage inverter. Therefore, the given reactive power is determined in advance. After the feedback reactive power of the high-voltage inverter is calculated, the difference between the feedback reactive power and the given reactive power needs to be determined to control the high-voltage permanent magnet synchronous motor based on the difference to achieve constant control of the reactive power.

[0031] Specifically, the corresponding d-axis voltage and q-axis voltage are obtained according to the difference between the feedback reactive power and the given reactive power, and the voltage formed by the V / F operation, which specifically includes: according to the difference between the feedback reactive power and the given reactive power, the corresponding d-axis voltage is obtained through the PI regulator; the d-axis voltage and the voltage formed by the V / F operation are added to obtain the corresponding q-axis voltage.

[0032] S104: converting the d-axis voltage and the q-axis voltage to obtain corresponding updated three-phase voltages, and outputting the voltages to the high-voltage permanent magnet synchronous motor after modulation to implement loading control of the high-voltage permanent magnet synchronous motor.

[0033] In this embodiment of the present application, the difference between the feedback reactive power and the set reactive power is compared and then calculated to obtain an updated three-phase voltage. This updated three-phase voltage is then used to control the high-voltage permanent magnet synchronous motor. Furthermore, subsequent calculations and analyses of the feedback reactive power are based on the updated three-phase voltage.

[0034] Specifically, it is necessary to perform coordinate conversion on the d-axis voltage and the q-axis voltage, and convert the dq coordinate system into a three-phase voltage in the abc coordinate system.

[0035] Furthermore, after modulation, it is output to the high-voltage permanent magnet synchronous motor, specifically including: performing carrier phase-shift PWM modulation on the updated three-phase voltage to form a corresponding wave signal; sending the wave signal to the cascaded power unit in the high-voltage inverter, and outputting the corresponding voltage to the high-voltage permanent magnet synchronous motor.

[0036] In one embodiment of the present application, before collecting the three-phase current and three-phase voltage output by the high-voltage inverter, the method further includes: performing multi-channel current sampling through different current sampling loops; wherein each current sampling loop corresponds to a sampling accuracy of current in a different size range; based on multiple current values ​​collected by the multi-channel current sampling and the size range corresponding to each current sampling loop, selecting a current sampling loop that matches the multiple current values; and using the current value corresponding to the selected current sampling loop as the three-phase current value with the highest accuracy in the multi-channel current sampling, and outputting it.

[0037] Among them, the current sampling loops correspond to sampling accuracies of currents of different size ranges, indicating that different current sampling loops have different accuracies for collecting currents of different sizes. For example, current sampling loop 1 has the highest accuracy for collecting currents within a first range, and current sampling loop 2 has the highest accuracy for collecting currents within a second range. The sizes of the first range and the second range are different.

[0038] Generally speaking, the current values ​​collected by multiple current sampling loops are relatively close (for example, the current sampling values ​​of three loops are 82A, 82.5A, and 84A respectively). Therefore, by matching with the current sampling loop, the current sampling loop with the highest accuracy in collecting currents within this range can be selected, and the current value collected by this loop will be used as the basis.

[0039] Furthermore, the current sampling loops may be divided into a plurality of current sampling loops of different size ranges according to the maximum rated current of the high-voltage inverter; wherein the size ranges corresponding to the current sampling loops do not overlap.

[0040] like Figure 3 As shown, the maximum rated current of the high-voltage inverter is 300A, and three current sampling paths are divided as an example for explanation.

[0041] The first path includes a current sensor 1 and a current sampling circuit 1, which corresponds to a sampling circuit under a rated current of 100A. The current sampled by this path is calibrated to the rated current of 100A, and the current sampling accuracy is high within 0-100A; the second path includes a current sensor 2 and a current sampling circuit 2, which corresponds to a sampling circuit under a rated current of 200A. The current sampled by this path is calibrated to the rated current of 200A, and the current sampling accuracy is high within 100-200A; the third path includes a current sensor 3 and a current sampling circuit 3, which corresponds to a sampling circuit under a rated current of 300A. The current sampled by this path is calibrated to the rated current of 300A, and the current sampling accuracy is high within 200-300A.

[0042] During current sampling, the three-phase current i output by the high-voltage inverter a ,i b ,i c , enter three channels respectively, and the current size is detected by the current sensor. The three sampling loop values ​​obtained all enter the automatic selector. The automatic selector selects which current sampling circuit to match based on the detected current size. When the output current is 0-100A, since the first sampling loop has a higher current accuracy in detecting this range, the automatic selector selects the current acquisition value of the first sampling loop and sends it to the control system; when the output current is 100-200A, since the second sampling loop has a higher current accuracy in detecting this range, the automatic selector selects the current acquisition value of the second sampling loop and sends it to the control system; when the output current is 200-300A, since the third sampling loop has a higher current accuracy in detecting this range, the automatic selector selects the current acquisition value of the third sampling loop and sends it to the control system.

[0043] In an embodiment of the present application, when the high-voltage frequency converter performs a loading test on a high-voltage permanent magnet synchronous motor, parameter identification is not required. By calculating and analyzing the reactive power, the reactive power can be controlled to be constant, thereby directly controlling the loading of the high-voltage permanent magnet synchronous motor. This is simpler and more convenient, greatly facilitates the test operation, and improves the efficiency of the loading test. In addition, by presetting multiple current sampling circuits with different sampling accuracies for different current sizes, the current sampling circuit can be automatically switched according to the size of the output current, and the current sampling circuit with the highest accuracy can be selected. This ensures high precision of current sampling and allows the use of a larger high-voltage frequency converter device to realize the loading test of high-voltage permanent magnet synchronous motors of different power sizes, which is conducive to enhancing the high capacity of the loading test and saving costs.

[0044] Corresponding to the above-mentioned parameter-free identification high-voltage permanent magnet synchronous motor loading control method, the present application also provides a parameter-free identification high-voltage permanent magnet synchronous motor loading control system, which is described in detail below.

[0045] Figure 4 A schematic structural diagram of a high-voltage permanent magnet synchronous motor loading control system without parameter identification is provided in an embodiment of the present application.

[0046] like Figure 4 As shown in the figure, the high-voltage inverter is connected to the high-voltage permanent magnet synchronous motor for loading test. During the loading test, the three-phase current i output by the high-voltage inverter is collected. a ,i b ,i c , sent to the reactive power analysis module, combined with the three-phase wave modulation signal u a * ,u b * ,u c * , sent to the reactive power analysis module. The reactive power analysis module parses the feedback reactive power value Q, calculates the error between the given reactive power Q* and the feedback reactive power Q, and sends it to the PI regulator. The PI regulator outputs the d-axis voltage U d , while the voltage U and U formed by V / F operation d Add up to get U q Voltage value. Voltage U d and U q The voltage wave signal u is generated by changing the dq coordinate system to the abc coordinate system a * ,u b * ,u c * . Three-phase voltage u a * ,u b *,u c * The final transmission signal is formed through carrier phase-shift PWM debugging and sent to each power unit A1~A5, B1~B5, C1~C5 of the high-voltage inverter through optical fiber communication. After the power units are cascaded, the output voltage is sent to the high-voltage permanent magnet synchronous motor.

[0047] Among them, the structure proposed by this system does not limit the voltage level of the high-voltage inverter, nor does it limit the type of power unit mentioned, as long as it can achieve the functions described in this system.

[0048] Figure 5 A structural schematic diagram of another parameter-free high-voltage permanent magnet synchronous motor loading control system provided in an embodiment of the present application is provided. The parameter-free high-voltage permanent magnet synchronous motor loading control system operates based on the above-mentioned parameter-free high-voltage permanent magnet synchronous motor loading control method.

[0049] like Figure 5 As shown, the system includes: The acquisition module 501 is used to acquire the three-phase current and three-phase voltage output by the high-voltage inverter; The reactive power analysis module 502 is used to perform coordinate transformation calculation and analysis on the three-phase current and three-phase voltage to obtain feedback reactive power; a calculation module 503 for obtaining corresponding d-axis voltage and q-axis voltage according to the difference between the feedback reactive power and the given reactive power and the voltage formed by the V / F operation; The dq-abc conversion module 504 is used to convert the d-axis voltage and the q-axis voltage to obtain corresponding updated three-phase voltages, which are modulated and output to the high-voltage permanent magnet synchronous motor to achieve loading control of the high-voltage permanent magnet synchronous motor.

[0050] In one embodiment, the system further includes a multi-channel current sampling circuit and an automatic selection module; An automatic selection module is used to perform multi-channel current sampling through different current sampling loops; wherein each current sampling loop corresponds to a sampling accuracy of current in a different size range, and based on multiple current values ​​collected by the multi-channel current sampling and the size range corresponding to each current sampling loop, a current sampling loop that matches the multiple current values ​​is selected, and the current value corresponding to the selected current sampling loop is used as the three-phase current value with the highest accuracy in the multi-channel current sampling and output.

[0051] It should be understood that the various parts disclosed in this application can be implemented using hardware, software, firmware, or a combination thereof. In the description of the above embodiments, specific features, structures, materials, or characteristics can be combined in any one or more embodiments or examples in a suitable manner.

[0052] The various embodiments in this application are described in a progressive manner. Similar parts between the various embodiments can be referred to in conjunction with each other. Each embodiment focuses on the differences between the other embodiments. In particular, the system embodiment is generally similar to the method embodiment, so the description is relatively simple. For relevant parts, refer to the partial description of the method embodiment.

[0053] The system and method provided in the embodiments of the present application correspond one to one. Therefore, the system also has similar beneficial technical effects to its corresponding method. Since the beneficial technical effects of the method have been described in detail above, the beneficial technical effects of the system will not be repeated here.

[0054] The flowcharts and block diagrams in the accompanying drawings illustrate the possible architectures, functions and operations of the systems, methods and computer program products according to various embodiments of the present application. In this regard, each box in the flowchart or block diagram can represent a module, program segment, or part of a code, which contains one or more executable instructions for implementing the specified logical functions. It should also be noted that in some alternative implementations, the functions marked in the boxes can also occur in an order different from that marked in the accompanying drawings. For example, two boxes represented in succession can actually be executed substantially in parallel, and they can sometimes be executed in the opposite order, depending on the functions involved. It should also be noted that each box in the block diagram and / or flowchart, and the combination of boxes in the block diagram and / or flowchart, can be implemented using a dedicated hardware-based system that performs the specified functions or operations, or can be implemented using a combination of dedicated hardware and computer instructions. The modules described in the embodiments of the present application may be implemented in software or hardware, wherein the name of a module does not necessarily limit the unit itself.

[0055] It should also be noted that the terms "comprises," "includes," or any other variations thereof are intended to encompass non-exclusive inclusion, such that a process, method, commodity, or apparatus that includes a series of elements includes not only those elements but also other elements not explicitly listed, or includes elements inherent to such process, method, commodity, or apparatus. In the absence of further limitations, an element defined by the phrase "comprises a ..." does not exclude the presence of other identical elements in the process, method, commodity, or apparatus that includes the element.

[0056] The foregoing is merely an embodiment of the present application and is not intended to limit the present application. For those skilled in the art, the present application may have various changes and variations. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present application should all be included within the scope of the claims of the present application.

Claims

1. A method for controlling high-voltage permanent magnet synchronous motor loading without parameter identification, characterized in that: The method comprises: Collect the three-phase current and three-phase voltage output by the high-voltage inverter; Performing coordinate transformation calculation and analysis on the three-phase current and three-phase voltage to obtain feedback reactive power; According to the difference between the feedback reactive power and the given reactive power, and the voltage formed by the V / F operation, the corresponding d-axis voltage and q-axis voltage are obtained; The d-axis voltage and the q-axis voltage are converted to obtain corresponding updated three-phase voltages, which are modulated and output to the high-voltage permanent magnet synchronous motor to achieve loading control of the high-voltage permanent magnet synchronous motor.

2. The method for controlling the high-voltage permanent magnet synchronous motor loading without parameter identification according to claim 1, characterized in that: The coordinate transformation calculation and analysis of the three-phase current and the three-phase voltage to obtain the feedback reactive power specifically includes: Performing coordinate transformation on the three-phase current and the three-phase voltage to obtain corresponding d-axis current, q-axis current, d-axis voltage and q-axis voltage; A vector cross product operation is performed on the d-axis current, the q-axis current, the d-axis voltage, and the q-axis voltage to obtain feedback reactive power.

3. The method for controlling the high-voltage permanent magnet synchronous motor loading without parameter identification according to claim 2, characterized in that: The coordinate transformation includes Clark transformation and Park transformation.

4. The method for controlling the high-voltage permanent magnet synchronous motor loading without parameter identification according to claim 2, characterized in that: The performing of a vector cross product operation on the d-axis current, the q-axis current, the d-axis voltage, and the q-axis voltage to obtain the feedback reactive power specifically includes: The product of the d-axis current and the q-axis voltage and the product of the q-axis current and the d-axis voltage are added together to obtain feedback reactive power.

5. The method for controlling the high-voltage permanent magnet synchronous motor loading without parameter identification according to claim 1, characterized in that: The step of obtaining the corresponding d-axis voltage and q-axis voltage according to the difference between the feedback reactive power and the given reactive power and the voltage formed by the V / F operation specifically includes: According to the difference between the feedback reactive power and the given reactive power, the corresponding d-axis voltage is obtained through a PI regulator; The d-axis voltage is added to the voltage formed by V / F operation to obtain the corresponding q-axis voltage.

6. The method for controlling high-voltage permanent magnet synchronous motor loading without parameter identification according to claim 1, characterized in that: The output to the high-voltage permanent magnet synchronous motor after modulation specifically includes: Performing carrier phase-shift PWM modulation on the updated three-phase voltage to form a corresponding wave signal; The wave signal is sent to the cascaded power unit in the high-voltage inverter, and the corresponding voltage is output to the high-voltage permanent magnet synchronous motor.

7. The method for controlling the high-voltage permanent magnet synchronous motor loading without parameter identification according to claim 1, characterized in that: Before collecting the three-phase current and three-phase voltage output by the high-voltage inverter, the method further includes: Perform multi-channel current sampling through different current sampling loops; wherein each current sampling loop corresponds to a sampling accuracy of currents of different size ranges; Selecting a current sampling loop that matches the multiple current values ​​according to the multiple current values ​​collected by the multi-channel current sampling and the size range corresponding to each current sampling loop; The current value corresponding to the selected current sampling loop is used as the three-phase current value with the highest accuracy in the multi-channel current sampling and is output.

8. The method for controlling the high-voltage permanent magnet synchronous motor loading without parameter identification according to claim 7, characterized in that: Before collecting the three-phase current and three-phase voltage output by the high-voltage inverter, the method further includes: According to the maximum rated current of the high-voltage inverter, a plurality of current sampling loops with different size ranges are divided; wherein the size ranges corresponding to the current sampling loops do not overlap.

9. A parameter-free identification high-voltage permanent magnet synchronous motor loading control system, based on the parameter-free identification high-voltage permanent magnet synchronous motor loading control method according to any one of claims 1 to 8, characterized in that: The system comprises: Acquisition module, used to collect the three-phase current and three-phase voltage output by the high-voltage inverter; A reactive power analysis module is used to perform coordinate conversion calculation and analysis on the three-phase current and three-phase voltage to obtain feedback reactive power; a calculation module, configured to obtain corresponding d-axis voltage and q-axis voltage according to the difference between the feedback reactive power and the given reactive power and the voltage formed by V / F operation; The dq-abc conversion module is used to convert the d-axis voltage and the q-axis voltage to obtain the corresponding updated three-phase voltage, which is output to the high-voltage permanent magnet synchronous motor after modulation to achieve loading control of the high-voltage permanent magnet synchronous motor.

10. The parameter identification-free high-voltage permanent magnet synchronous motor loading control system according to claim 9, characterized in that: The system also includes a multi-channel current sampling circuit and an automatic selection module; The automatic selection module is configured to perform multi-channel current sampling through different current sampling loops, wherein each current sampling loop corresponds to a sampling accuracy of currents in different ranges, and based on multiple current values ​​collected by the multi-channel current sampling and the ranges corresponding to each current sampling loop, a current sampling loop matching the multiple current values ​​is selected, and the current value corresponding to the selected current sampling loop is used as the three-phase current value with the highest accuracy in the multi-channel current sampling and output.

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