A Disturbance-Observer-Based Load Current Feedforward Control and Parameter Design Method for Voltage-Sourced Inverter
Cao Wenyuan1, Han Minxiao1, Xie Wenqiang1, Li Rui2, Yuan Dong3
1. State Key Laboratory of Alternate Electrical Power System with Renewable Energy Source North China Electric Power University Beijing 102206 China; 2. China Electric Power Research Institute Beijing 100192 China; 3. State Grid Jiangsu Electric Power Co. Ltd Nanjing 210024 China
Abstract：To solve the output voltage fluctuation caused by load switching for voltage-sourced inverter with traditional voltage and current dual loop control, a disturbance-observer-based load current feedforward control method is proposed. This method regards the load current as a system disturbance, and feeds forward it to the output of the compensator in voltage loop after it is measured by disturbance observer, thereby the influence of the load current on the output voltage is suppressed. Without adding additional current sensors, signal transmission or processing circuits, fast tracking of the load current is realized, the dynamic performance of the system is thus improved and the steady-state error of output voltage is reduced. Based on the requirements of rapid response capability and stability of the control system, a parameter design method with universality and portability is given. The analysis shows that compared with the traditional dual loop control, the disturbance-observer-based load current feedforward control method proposed in this paper is less sensitive to parameter perturbation and the system is more robust. Simulations and experiments verify the feasibility and effectiveness of the proposed control strategy and the parameter design method.
曹文远, 韩民晓, 谢文强, 李蕊, 袁栋. 基于扰动观测器的电压源型逆变器负载电流前馈控制及参数设计方法[J]. 电工技术学报, 2020, 35(4): 862-873.
Cao Wenyuan, Han Minxiao, Xie Wenqiang, Li Rui, Yuan Dong. A Disturbance-Observer-Based Load Current Feedforward Control and Parameter Design Method for Voltage-Sourced Inverter. Transactions of China Electrotechnical Society, 2020, 35(4): 862-873.
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2020, Vol. 35 
