Motor simulation device and method

Abstract

The embodiment of the application relates to the technical field of motor simulation, and discloses a motor simulation device and method, the device comprising: a motor winding simulation unit, a power unit and a control unit; wherein the power unit comprises: a first power unit and a second power unit; the motor winding simulation unit is connected with a motor driving system and the first power unit in alternating current power connection; wherein the motor winding simulation unit is used for simulating motor winding; the first power unit and the second power unit are connected through a direct current bus, and the second power unit is connected with a power grid in alternating current power connection; wherein the first power unit is used for simulating motor output current and transmitting to the motor driving system; the control unit is connected with the first power unit and the second power unit; wherein the control unit generates a PWM driving signal used for driving the power unit to simulate motor output current according to a terminal voltage of a sampled driving voltage signal of the motor driving system, and stable operation in a power generation mode or a motor mode is realized.

Description

Technical Field

[0001] This invention relates to the field of motor simulation technology, and in particular to a motor simulation device and method. Background Technology

[0002] The motor simulation devices and methods in the relevant technologies require hardware and software support, and the hardware cannot support the power generation mode under controllable conditions. Therefore, the motor simulation devices and methods in the relevant technologies can only simulate the motor mode and cannot simulate the normal power generation mode. As a result, it is impossible to achieve comprehensive, efficient and safe testing of the function and performance of the motor drive system. Therefore, there is an urgent need to provide a new motor simulation device and method that can stably operate in both power generation mode and electric mode. Summary of the Invention

[0003] The purpose of this invention is to solve the above-mentioned problems and provide a motor simulation device and method, which solves the problem that the existing motor simulation device cannot simulate the normal operation mode of power generation, thereby realizing comprehensive testing of the function and performance of the motor drive system.

[0004] To address the aforementioned problems, embodiments of this application provide a motor simulation device, comprising: a motor winding simulation unit, a power unit, and a control unit; wherein the power unit includes: a first power unit and a second power unit; the motor winding simulation unit is AC-connected to a motor drive system and the first power unit; wherein the motor winding simulation unit is used to simulate motor windings. The first power unit and the second power unit are connected via a DC bus, and the second power unit is AC-connected to the power grid; wherein the first power unit is used to simulate the motor output current and transmit it to the motor drive system; the control unit is connected to the first power unit and the second power unit; wherein the control unit generates a PWM drive signal for driving the power unit to simulate the motor output current based on the terminal voltage of the sampled drive voltage signal of the motor drive system.

[0005] To address the aforementioned problems, embodiments of this application provide a motor simulation method, comprising: sampling the terminal voltage of a drive voltage signal generated by a motor drive system; generating a PWM drive signal based on the terminal voltage of the drive voltage signal; simulating the motor output current based on the PWM drive signal; and transmitting the output current to the motor drive system.

[0006] The motor simulation device and method provided in this application connect a motor winding simulation unit to the AC power of a motor drive system, and simultaneously connects the motor winding simulation unit to the AC power of a first power unit. The first power unit and a second power unit are connected via a DC bus, and the second power unit is connected to the AC power of the power grid. The control unit is connected to the first and second power units via I / O, enabling the motor winding simulation unit to simulate the inductive electrical characteristics of the motor winding. The control unit drives the first and second power units to simulate the motor output current, so that the first power unit outputs simulated current to the motor drive system, and the second power unit outputs simulated current to the power grid. This ensures that the energy of the motor simulation device can flow bidirectionally with high efficiency, thereby ensuring that the motor can work stably in electric mode or generator mode. It is applicable to scenario simulation with electric mode or generator mode, such as wind turbine simulation test benches or new energy vehicle motor simulation test benches, thereby testing the electric control performance and generator control performance of the motor drive system.

[0007] In addition, the control unit includes: a sampling circuit, a comparison circuit, a protection circuit, a drive circuit, a DSP chip, and an FPGA chip; the sampling circuit is used to sample the terminal voltages Uab and Ubc of the drive voltage signal generated by the motor drive system; the comparison circuit is used to compare the sampled terminal voltages Uab and Ubc to obtain the characteristics of the sampled terminal voltages Uab and Ubc; both the DSP chip and the FPGA chip are used to calculate the characteristic current that the motor needs to generate; the drive circuit is used to generate the PWM drive signal of the drive power unit to simulate the output current of the motor, realizing the simulation of the electrical external characteristics of the motor by the motor simulation device and completing the closed-loop control.

[0008] In addition, the motor winding simulation unit adopts an LCL circuit topology, which can effectively reduce the harmonic interference generated by the first power unit during power generation in generator mode, while accurately simulating the inductive electrical characteristics of the motor winding.

[0009] In addition, both the first and second power units adopt the NPC topology, which greatly improves the DC terminal voltage of the motor and also increases the switching frequency of the power units, thereby simulating a higher fundamental frequency of the motor.

[0010] In addition, the switching modules of the first power unit and the second power unit both use controllable power switching devices, which ensures that the energy of the motor simulation device can flow in both directions with high efficiency, thereby ensuring that the motor simulation device can operate stably in electric mode or generator mode.

[0011] In addition, the motor simulation device is connected to the power section of the motor drive system, which enables the testing and verification of the motor drive system under power conditions. Attached Figure Description

[0012] One or more embodiments are illustrated by way of example with reference numerals in the accompanying drawings. These illustrations do not constitute a limitation on the embodiments. Elements with the same reference numerals in the drawings are denoted as similar elements. Unless otherwise stated, the figures in the drawings are not to be limited by scale.

[0013] Figure 1 This is a schematic diagram of a motor simulation device provided in an embodiment of this application;

[0014] Figure 2 This is a schematic diagram of the topology of a motor winding simulation unit provided in an embodiment of this application;

[0015] Figure 3 This is a schematic diagram of the topology of the first power unit provided in an embodiment of this application;

[0016] Figure 4 This is a schematic diagram of the topology of the second power unit provided in an embodiment of this application;

[0017] Figure 5 This is an energy flow diagram of a motor simulation device provided in an embodiment of this application;

[0018] Figure 6 This is a flowchart of a motor simulation method provided in an embodiment of this application. Detailed Implementation

[0019] As can be seen from the background technology, there is an urgent need to provide a new motor simulation device to solve the problem that existing motor simulation devices can only simulate the motor mode and cannot simulate the normal operation mode of power generation.

[0020] To address the aforementioned problems, this application provides a motor simulation device, comprising: a motor winding simulation unit, a power unit, and a control unit; wherein the power unit includes: a first power unit and a second power unit; the motor winding simulation unit is AC-connected to a motor drive system and the first power unit; wherein the motor winding simulation unit is used to simulate motor windings. The first power unit and the second power unit are connected via a DC bus, and the second power unit is AC-connected to the power grid; wherein the first power unit is used to simulate the motor output current and transmit it to the motor drive system; the control unit is connected to the first power unit and the second power unit; wherein the control unit generates a PWM drive signal for driving the power unit to simulate the motor output current based on the terminal voltage of the sampled drive voltage signal of the motor drive system.

[0021] The motor simulation device provided in this application connects a motor winding simulation unit to the AC power of a motor drive system, and simultaneously connects the motor winding simulation unit to the AC power of a first power unit. The first power unit and a second power unit are connected via a DC bus, and the second power unit is connected to the AC power of the power grid. The control unit is connected to the first and second power units via I / O, enabling the motor winding simulation unit to simulate the inductive electrical characteristics of the motor winding. The control unit drives the first and second power units to simulate the motor output current, so that the first power unit outputs simulated current to the motor drive system, and the second power unit outputs simulated current to the power grid. This ensures that the energy of the motor simulation device can flow bidirectionally with high efficiency, thereby ensuring that the motor can work stably in electric mode or generator mode. It can be applied to simulation scenarios with electric mode or generator mode, such as wind turbine simulation benches or new energy vehicle motor simulation benches, thereby testing the electric control performance and generator control performance of the motor drive system.

[0022] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the various embodiments of this application will be described in detail below with reference to the accompanying drawings. However, those skilled in the art will understand that many technical details have been presented in the various embodiments of this application to enable the reader to better understand this application. However, the technical solutions claimed in this application can be implemented even without these technical details and various changes and modifications based on the following embodiments.

[0023] This application provides a motor simulation device, which mainly consists of four parts: a motor winding simulation unit, a first power unit, a second power unit, and a control unit. The motor simulation device is as follows: Figure 1 As shown, the motor winding simulation unit is connected to the motor drive system via AC power, and is also connected to the first power unit via AC power. The first power unit and the second power unit are connected via a DC bus, and the first power unit is connected to the power grid via AC power. The control unit is connected to the first power unit and the second power unit via I / O, and is used to transmit low-voltage digital signals and low-voltage analog signals. The low-voltage digital signals and low-voltage analog signals are used to drive the first power unit and the second power unit to simulate mechanical energy or to convert the simulated mechanical energy into electrical energy.

[0024] The motor winding simulation unit is used to simulate motor windings and adopts an LCL circuit topology, such as... Figure 2 As shown, by using the LCL circuit topology, when the motor simulation device is in generator mode, the harmonic interference generated by the first power unit during power generation can be effectively reduced, and the inductive electrical characteristics of the motor windings can be accurately simulated.

[0025] The first and second power units are used to simulate the motor output current and transmit the output current to the motor drive system and the power grid, respectively. Both the first and second power units adopt an NPC topology. This NPC topology significantly increases the DC terminal voltage of the motor and also increases the switching frequency of the power units, thereby simulating higher fundamental motor frequencies and enabling the motor simulation device to simulate motors of different power levels. The topologies of the first and second power units are as follows: Figure 3 and Figure 4 As shown, the switching modules of both the first and second power units utilize controllable power switching devices, such as SiC and IGBT. By using these controllable power switching devices, the energy of the motor simulation device can flow efficiently in both directions, thus ensuring the motor can operate stably in either motoring or generating mode. Furthermore, by connecting more bridge arms in parallel—meaning the circuit provided in this embodiment is not limited to a three-phase circuit—a multi-phase circuit can be obtained, allowing the motor simulation device provided in this embodiment to simulate multi-phase motors.

[0026] The control unit generates a PWM drive signal to drive the power unit and simulate the motor output current based on the terminal voltage of the sampled drive voltage signal of the motor drive system. The control unit is the core of the motor simulation device and includes hardware modules such as sampling circuits, comparison circuits, protection circuits, and drive circuits, as well as chips such as DSP and FPGA. Specifically, the sampling circuit samples the terminal voltages Uab and Ubc of the drive voltage signal generated by the motor drive system; the comparison circuit compares the terminal voltages Uab and Ubc to obtain their characteristics; the protection circuit protects the control unit's circuitry, preventing unstable factors from affecting the control effect; both the SDS and FPGA chips calculate the characteristic current required by the motor body based on the characteristics of Uab and Ubc; and the drive circuit generates the PWM drive signal for the power unit based on the required characteristic current, which drives the power unit to perform switching actions, simulating the motor output current. Additionally, the control unit contains a pre-built digital model of the motor.

[0027] In addition, the motor simulation device is connected to the power section of the motor drive system, which enables testing and verification of the motor drive system under power conditions.

[0028] The motor simulation device proposed in this application actually includes a motor body model and a motor test bench with a load model. It can simulate electric motors and generators according to the user's actual needs, with specific energy flows as follows: Figure 5 As shown. The specific content is as follows:

[0029] In step 501, the operating mode of the motor is determined.

[0030] In step 502, when the motor simulation device is operating in electric mode, the motor drive system controls the digital model of the motor in the motor simulation device to rotate, simulating the output of mechanical energy.

[0031] In step 503, the motor simulation device converts the simulated mechanical energy into electrical energy, which is then transmitted to the power grid through the second power unit.

[0032] In step 504, when the motor simulation device is operating in power generation mode, electrical energy is obtained from the power grid and converted into simulated mechanical energy through the second power unit.

[0033] In step 505, the simulated mechanical energy drives the digital model of the motor to rotate, generating electrical energy.

[0034] In step 506, electrical energy is transmitted to the motor drive system through the first power unit.

[0035] The motor simulation device provided in this application embodiment can simulate various types of motors such as permanent magnet synchronous motors, asynchronous motors, brushless DC motors, and switched reluctance motors. It can also simulate various electrical and mechanical faults such as overcurrent, phase loss, short circuit, overtemperature, three-phase imbalance, and shaft breakage, thereby realizing comprehensive testing of the control function and performance of the motor drive system in a safe and efficient manner.

[0036] The motor simulation device provided in this application embodiment can simulate the inductive electrical characteristics of a motor winding through a motor winding simulation unit. A control unit drives a first power unit and a second power unit to simulate the motor output current. The first power unit outputs simulated current to the motor drive system, and the second power unit outputs simulated current to the power grid, ensuring efficient bidirectional energy flow. This allows the motor simulation device to operate stably in either electric or power generation mode, such as in scenarios with electric or power generation modes, like wind turbine simulation benches or new energy vehicle motor simulation benches. This allows for testing the electric and power generation control performance of the motor drive system. It enables testing and verification of the motor drive system under varying power conditions. Through the control operation of the control unit, the motor simulation device can simulate motor benches of different power levels to test the motor drive system, thereby saving equipment and time costs.

[0037] This application also provides a motor simulation method applied to the aforementioned motor simulation device. The implementation details of the motor simulation method in this embodiment are described below. The following content is only for understanding the implementation details of this solution and is not essential for implementing this solution. The specific process is as follows: Figure 6As shown, the steps may include the following:

[0038] In step 601, the terminal voltage of the drive voltage signal generated by the motor drive system is sampled.

[0039] In one example, after the motor drive system generates a drive voltage signal, it obtains the terminal voltage of the drive voltage signal, wherein the terminal voltage includes: terminal voltage Uab and terminal voltage Ubc.

[0040] In step 602, a PWM drive signal is generated based on the terminal voltage of the drive voltage signal.

[0041] In this embodiment, the characteristics of terminal voltages Uab and Ubc are obtained by comparing them; based on the characteristics of terminal voltages Uab and Ubc, the characteristic current that the motor needs to generate is calculated; and based on the characteristic current that the motor needs to generate, a PWM drive signal is generated.

[0042] In step 603, the motor output current is simulated according to the PWM drive signal, and the output current is transmitted to the motor drive system.

[0043] In one example, after receiving the PWM drive signal, the power unit in the motor simulation device executes a switching action according to the instruction of the PWM drive signal, simulates the motor output current, and transmits the output current to the motor drive system.

[0044] In this embodiment of the application, before sampling the terminal voltage of the drive voltage signal generated by the motor drive system, the method further includes: constructing a digital model of the motor; the digital model of the motor is used to simulate the rotation of the motor body.

[0045] In one example, the energy flow process of the motor simulation method is as follows: When the motor operates in electric mode, the motor drive system controls the rotation of the digital model of the motor in the motor simulation device. The simulated mechanical energy is calculated based on the model. The motor simulation device converts the simulated mechanical energy into electrical energy, which is then transmitted to the power grid through a second power unit within the motor simulation device. When the motor operates in generator mode, the motor simulation device obtains electrical energy from the power grid and converts it into simulated mechanical energy through the second power unit. The simulated mechanical energy drives the digital model of the motor to rotate, generating electrical energy, which is then transmitted to the motor drive system through a first power unit.

[0046] The motor simulation method provided in this application allows the motor simulation device to operate stably in electric or generator mode, thereby enabling the testing of the electric control performance and generator control performance of the motor drive system. It achieves power environment testing and verification of the motor drive system. Through the control operation of the control unit, the motor simulation device can simulate motor benches of different power levels to test the motor drive system, thus saving equipment and time costs.

[0047] It is not difficult to see that this embodiment is a method embodiment corresponding to the above-described motor simulation device embodiment, and this embodiment can be implemented in conjunction with the above-described motor simulation device embodiment. The relevant technical details mentioned in the above-described motor simulation device embodiment are still valid in this embodiment, and will not be repeated here to reduce repetition. Accordingly, the relevant technical details mentioned in this embodiment can also be applied to the above-described motor simulation device embodiment.

[0048] The steps of the various methods described above are only for clarity. In practice, they can be combined into one step or some steps can be split into multiple steps. As long as they include the same logical relationship, they are all within the scope of protection of this patent. Adding insignificant modifications or introducing insignificant designs to the algorithm or process, but without changing the core design of the algorithm and process, are also within the scope of protection of this patent.

[0049] The above embodiments are provided for those skilled in the art to implement and use this application. Those skilled in the art can make various modifications or changes to the above embodiments without departing from the inventive concept of this application. Therefore, the protection scope of this application is not limited to the above embodiments, but should conform to the maximum scope of the innovative features mentioned in the claims.

Claims

1. A motor simulation device, characterized in that, include: The system includes a motor winding simulation unit, a power unit, and a control unit; wherein the power unit comprises: a first power unit and a second power unit. The motor winding simulation unit is connected to the motor drive system and the first power unit via AC power; wherein, the motor winding simulation unit is used to simulate the motor winding; The first power unit and the second power unit are connected via a DC bus, and the second power unit is connected to the AC power grid; wherein, the first power unit is used to simulate the motor output current and transmit it to the motor drive system, and the second power unit is used to simulate the motor output current and transmit it to the power grid; The control unit is connected to the first power unit and the second power unit; wherein, the control unit generates a PWM drive signal for driving the power unit to simulate the output current of the motor based on the terminal voltage of the sampled drive voltage signal of the motor drive system; wherein... The motor winding simulation unit adopts an LCL circuit topology; Both the first power unit and the second power unit adopt an NPC topology.

2. The motor simulation device according to claim 1, characterized in that, The control unit includes: a sampling circuit, a comparison circuit, a protection circuit, a driving circuit, a DSP chip, and an FPGA chip; The sampling circuit is used to sample the terminal voltages Uab and Ubc of the drive voltage signal generated by the motor drive system; The comparison circuit is used to compare the sampled terminal voltage Uab and terminal voltage Ubc to obtain the characteristics of the sampled terminal voltage Uab and terminal voltage Ubc. Both the DSP chip and the FPGA chip are used to calculate the characteristic current that the motor needs to generate. The driving circuit is used to generate a PWM driving signal to drive the power unit to simulate the output current of the motor.

3. The motor simulation device according to claim 1, characterized in that, The switching modules of both the first power unit and the second power unit are controllable power switching devices.

4. The motor simulation device according to any one of claims 1-3, characterized in that, The motor simulation device is connected to the power section of the motor drive system.

5. A method for simulating an electric motor, characterized in that, The method, applied to the motor simulation device as described in any one of claims 1-4, comprises: The terminal voltage of the drive voltage signal generated by the sampled motor drive system; A PWM drive signal is generated based on the terminal voltage of the drive voltage signal; The PWM drive signal is used to simulate the motor output current, and the output current is transmitted to the motor drive system.

6. The motor simulation method according to claim 5, characterized in that, The terminal voltages of the driving voltage signal include terminal voltage Uab and terminal voltage Ubc; The step of generating a PWM drive signal based on the terminal voltage of the drive voltage signal includes: By comparing the terminal voltage Uab and the terminal voltage Ubc, the characteristics of the terminal voltage Uab and the terminal voltage Ubc are obtained; Based on the characteristics of the terminal voltages Uab and Ubc, calculate the characteristic current that the motor needs to generate; A PWM drive signal is generated based on the characteristic current required by the motor.

7. The motor simulation method according to claim 5, characterized in that, Before the terminal voltage of the drive voltage signal generated by the sampling motor drive system, the method further includes: constructing a digital model of the motor; the digital model of the motor is used to simulate the rotation of the motor body.

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