Active Damping Control Strategy for Five-phase Permanent Magnet Synchronous Motor Drive System without Electrolytic Capacitors

doi:10.11985/2023.04.012

Abstract

Abstract:

The electrolytic capacitor-less motor drive system has the advantages of small size, long life and high reliability. However, the motor drive system using film capacitors may have the problem of DC-link voltage instability, which is mainly manifested in the over-voltage phenomenon of DC-link voltage caused by LC resonance between film capacitors and grid-side inductors, and the existing resonance suppression strategy is widely used in the three-phase motors, while the five-phase permanent magnet synchronous motors without electrolytic capacitors resonance suppression strategy is applied to a lesser extent. For this reason, an active damping resonance suppression strategy for five-phase permanent magnet synchronous motors is proposed. Firstly, the instability and LC resonance of the system are analyzed based on the transfer function of the simplified driving circuit and the mathematical model of the five-phase permanent magnet synchronous motor is constructed. Secondly, the specific implementation of the damping current is introduced. Finally, the damping current is converted into a voltage command to construct a feedback loop to achieve the resonance suppression of the bus voltage, and the validity of the method is verified in the simulation.

Key words: Electrolytic capacitor-less, five-phase permanent magnet synchronous motor, LC resonant, active damping

CLC Number:

TM341

CHEN Qian, CHEN Xin, YAN Lihao, SHI Hao, HAN Xin. Active Damping Control Strategy for Five-phase Permanent Magnet Synchronous Motor Drive System without Electrolytic Capacitors[J]. Journal of Electrical Engineering, 2023, 18(4): 106-113.

Figures/Tables 15

References 21

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参数	数值
网侧输入电压有效值/V	380
网侧输入额定频率/Hz	50
直流电容/μF	15
网侧电感/mH	2
电机极对数p	4
电机定子电阻/Ω	0.8
基波d、q轴电感/mH	5.3/17
三次谐波d、q轴电感/mH	1.91/1.97
额定转速/(r/min)	3 000
额定转矩/(N·m)	27