A Fast-Transient Repetitive Control Strategy for Programmable Harmonic Current Source

• Lei, Wanjun (State Key Laboratory of Electrical Insulation and Power Equipment, Shaanxi Key Laboratory of Smart Grid, Xi'an Jiaotong University) ;
• Nie, Cheng (State Key Laboratory of Electrical Insulation and Power Equipment, Shaanxi Key Laboratory of Smart Grid, Xi'an Jiaotong University) ;
• Chen, Mingfeng (State Key Laboratory of Electrical Insulation and Power Equipment, Shaanxi Key Laboratory of Smart Grid, Xi'an Jiaotong University) ;
• Wang, Huajia (State Grid Shandong Electric Power Research Institute) ;
• Wang, Yue (State Key Laboratory of Electrical Insulation and Power Equipment, Shaanxi Key Laboratory of Smart Grid, Xi'an Jiaotong University)
• Received : 2016.06.08
• Accepted : 2016.11.17
• Published : 2017.01.20

Abstract

The repetitive control (RC) strategy is widely used in AC power systems because of its high performance in tracking period signal and suppressing steady-state error. However, the dynamic response of RC is determined by the fundamental period delay $T_0$ existing in the internal model. In the current study, a ($nk{\pm}i$)-order harmonic RC structure is proposed to improve dynamic performance. The proposed structure has less data memory and can improve the tracking speed by n/2 times. $T_0$ proves the effectiveness of the ($nk{\pm}i$)-order RC strategy. The simulation and experiments of ($6k{\pm}1$)-order and ($4k{\pm}1$)-order RC strategy used in the voltage source inverter is conducted in this study to control the harmonic current source, which shows the validity and advantages of the proposed structure.

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