DC Bus Voltage Fluctuation Suppression Strategy for Small Capacitance Dual-PWM Speed Regulating System
Yao Xuliang1, Luo Xinghong1,2, Ma He1, Huang Shengqi1
1. College of intelligent Systems Science and Engineering Harbin Engineering University Harbin 150001 China; 2. Hangzhou Zhongheng Electric Company Limited Hangzhou 310051 China
Abstract Dual-PWM AC-DC-AC speed regulating system is widely used in modern Marine electric cranes. However, the system is not suitable for integration and maintenance because the DC bus uses large-capacity electrolytic capacitors. Based on the modeling of small signals, this paper presents a control strategy using small capacitance. Firstly, the reasons for system instability when the DC bus adopts small capacitors are analyzed. Then, the DC bus voltage feed-forward compensation and the d-axis current feed-forward compensation are designed to improve the system stability and load capacity. Combined with their advantages, the control strategy of small capacitance dual PWM speed regulation system is obtained. The simulation and experiment with permanent magnet synchronous motor as the load show that this strategy can ensure the stable operation of the system, restrain the voltage fluctuation of the DC bus during load sudden change and vibration, reduce the harmonic injection into the power network, and the parameter design method is universal.
Yao Xuliang,Luo Xinghong,Ma He等. DC Bus Voltage Fluctuation Suppression Strategy for Small Capacitance Dual-PWM Speed Regulating System[J]. Transactions of China Electrotechnical Society, 2022, 37(12): 2971-2981.
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2022, Vol. 37 
