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Synchronous motor rotor position evaluation method and device

A technology of synchronous motor and rotor position, applied in the direction of controlling electromechanical transmission, controlling generator, motor control, etc., can solve the problem of low precision, achieve good filtering effect, improve precision, and improve the effect of starting success rate

Active Publication Date: 2021-12-17
CHINA ELECTRIC POWER RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] In order to overcome the shortcomings of low precision in the above-mentioned prior art, the present application provides a method for evaluating the rotor position of a synchronous motor, including:

Method used

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  • Synchronous motor rotor position evaluation method and device
  • Synchronous motor rotor position evaluation method and device
  • Synchronous motor rotor position evaluation method and device

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0079] Embodiment 1 of the present application provides a method for evaluating the rotor position of a synchronous motor, the specific flow chart is as follows figure 1 As shown, the specific process is as follows:

[0080] S101: Determine the frequency of the induced signal in the voltage of the stator winding based on the collected voltage of the excitation winding;

[0081] S102: Determine the input signal of the moving average filter module (MAF) in the phase-locked loop based on the frequency of the induction signal in the voltage of the stator winding and the line voltage of the stator winding;

[0082] S103: Estimate the position of the rotor of the synchronous motor based on the input signal of the moving average filter module in the phase-locked loop.

[0083] Wherein, the frequency of the induced signal in the voltage of the stator winding is determined based on the collected voltage of the excitation winding, including:

[0084] Through the first voltage sensor (...

Embodiment 2

[0113] Based on the same inventive concept, Embodiment 2 of the present application also provides a synchronous motor rotor position evaluation device, such as Figure 4 shown, including:

[0114]A first determination module, configured to determine the frequency of the induced signal in the voltage of the stator winding based on the collected voltage of the excitation winding;

[0115] The second determination module is used to determine the input signal of the moving average filter module in the phase-locked loop based on the frequency of the induction signal in the voltage of the stator winding and the line voltage of the stator winding;

[0116] The evaluation module is used for evaluating the position of the rotor of the synchronous motor based on the input signal of the moving average filtering module in the phase-locked loop.

[0117] The first determining module is specifically used for:

[0118] collecting the voltage of the field winding through the first voltage s...

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Abstract

According to a synchronous motor rotor position evaluation method and device provided by the invention, the frequency of the induction signal in the voltage of the stator winding is determined firstly, then the input signal of the moving average filtering module in the phase-locked loop is determined, and finally the position of the synchronous motor rotor is evaluated, and the precision of the position of the synchronous motor rotor is improved through the moving average filtering module. The existing voltage of the excitation winding in the excitation winding is fully utilized, and the frequency of the alternating current signal in the voltage of the excitation winding is obtained by performing Fourier decomposition on the voltage of the excitation winding, so that the frequency of the induction signal in the voltage of the stator winding, which is equal to the frequency of the alternating current signal in the voltage of the excitation winding, is obtained, auxiliary equipment and additional signal injection are not needed, and the cost is low. Moreover, the starting success rate of the static frequency converter can be improved, a good foundation is laid for the static frequency converter in full-power variable-speed operation, heavy-load starting and low-speed load disturbance resistance improvement, and the operation performance of the synchronous motor is improved.

Description

technical field [0001] The present application relates to the field of power electronics technology, in particular to a method and device for evaluating the rotor position of a synchronous motor. Background technique [0002] Pumped storage power plants are usually used for large-capacity storage of electric energy, and the thyristor-based static frequency converter (Static Frequency Converter, SFC) is the core control equipment of pumped storage power plants. The static frequency converter performs commutation according to the rotor position of the synchronous motor, and then realizes self-synchronization. Once the rotor position is wrong, the static frequency converter will fail to commutate. Therefore, before the start of the synchronous motor, it is necessary to accurately obtain the initial position of the rotor, so as to ensure that the first set of thyristor pulse sequences produced by the static frequency converter can make the synchronous motor obtain the maximum st...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02P21/18H02P21/32H02P21/34H02P25/026
CPCH02P21/18H02P21/32H02P21/34H02P25/026H02P2203/03H02P2203/11
Inventor 李浩源李官军陶以彬吴福保杨波居蓉蓉余豪杰何洁琼陈国伟殷实孙博
Owner CHINA ELECTRIC POWER RES INST