Motor simulator control method for suppressing low-frequency circulating current in common DC bus

By injecting zero-sequence components on the motor simulator side and adjusting the algorithm, the low-frequency circulation caused by the common DC bus structure is suppressed, and the problems of system loss and test accuracy are solved, and efficient circulation suppression and maintenance of motor simulator performance are achieved.

CN118707922BActive Publication Date: 2025-03-11HARBIN INST OF TECH AT WEIHAI
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Patent Information

Application Number
CN202410693019.2
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2024-05-30
Publication Date
2025-03-11
Estimated Expiration
2044-05-30

AI Technical Summary

Technical Problem

The common DC bus structure causes low-frequency circulation in the motor-to-torch test platform, increasing system losses, reducing system life, and affecting test accuracy. The prior art solutions usually require modifying the algorithm of the motor controller or adding hardware common mode inductor, resulting in increased system complexity and not in line with practical application scenarios.

Method used

The unified model of the sinusoidal pulse width modulation algorithm based on zero-sequence component injection and the space vector pulse width modulation algorithm is adopted. Through the common mode voltage modulation factor adjustment algorithm, the common mode voltage on the motor controller side is cancelled in real time, thereby actively generating the common mode voltage on the motor simulator side to suppress low-frequency circulation.

Benefits of technology

It effectively suppresses the low-frequency circulation of the common DC bus, reduces system losses, extends the system life, and improves the test accuracy. It does not interfere with the control algorithm of the motor controller under test, maintaining the good output performance of the motor simulator.

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Abstract

The present application provides a motor simulator control method for suppressing low-frequency circulating current of a common DC bus, which is used to control the motor simulator in a motor-to-motor test platform with a common DC bus structure, and suppress the low-frequency circulating current between the motor controller and the motor simulator, including the following steps: establishing a control model of the motor-to-motor test platform with a common DC bus structure; establishing a unified model of a sinusoidal pulse width modulation algorithm based on zero-sequence component injection and a space vector pulse width modulation algorithm; using a common-mode voltage modulation factor to adjust the sinusoidal pulse width modulation algorithm based on zero-sequence component injection; and using the adjusted sinusoidal pulse width modulation algorithm based on zero-sequence component injection to control the motor simulator. The method provided in the present application controls the power inverter unit on the motor simulator side to actively generate a common-mode voltage at the zero-vector action time level to achieve effective suppression of low-frequency circulating current.
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Citation Information

Patent Citations

  • SVPWM control method of electric motor control and controller employing the same

    CN101159424A