An Optimal PR Control Strategy with Load Current Observer for a Three-Phase Voltage Source Inverter

Xiaobo Dou, Kang Yang, Xiangjun Quan, Qinran Hu, Zaijun Wu, Bo Zhao, Peng Li, Shizhan Zhang and Yang Jiao
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Xiaobo Dou: Department of Electrical Engineering, Southeast University, No. 2 Sipailou, Nanjing 210096, China
Kang Yang: Department of Electrical Engineering, Southeast University, No. 2 Sipailou, Nanjing 210096, China
Xiangjun Quan: Department of Electrical Engineering, Southeast University, No. 2 Sipailou, Nanjing 210096, China
Qinran Hu: Department of Electrical Engineering, Southeast University, No. 2 Sipailou, Nanjing 210096, China
Zaijun Wu: Department of Electrical Engineering, Southeast University, No. 2 Sipailou, Nanjing 210096, China
Bo Zhao: State Grid Zhejiang Electric Power Research Institute, Hangzhou 310014, China
Peng Li: State Grid Zhejiang Electric Power Research Institute, Hangzhou 310014, China
Shizhan Zhang: Department of Electrical Engineering, Southeast University, No. 2 Sipailou, Nanjing 210096, China
Yang Jiao: Department of Electrical Engineering, Southeast University, No. 2 Sipailou, Nanjing 210096, China

Energies, 2015, vol. 8, issue 8, 1-21

Abstract: Inverter voltage control is an important task in the operation of a DC/AC microgrid system. To improve the inverter voltage control dynamics, traditional approaches attempt to measure and feedforward the load current, which, however, needs remote measurement with communications in a microgrid system with distributed loads. In this paper, a load current observer (LCO) based control strategy, which does not need remote measurement, is proposed for sinusoidal signals tracking control of a three-phase inverter of the microgrid. With LCO, the load current is estimated precisely, acting as the feedforward of the dual-loop control, which can effectively enlarge the stability margin of the control system and improve the dynamic response to load disturbance. Furthermore, multiple PR regulators are applied in this strategy conducted in a stationary frame to suppress the transient fluctuations and the total harmonic distortion (THD) of the output voltage and achieve faster transient performance compared with traditional dual-loop control in a rotating dq0 frame under instantaneous change of various types of load ( i.e. , balanced load, unbalanced load, and nonlinear load). The parameters of multiple PR regulators are analyzed and selected through the root locus method and the stability of the whole control system is evaluated and analyzed. Finally, the validity of the proposed approach is verified through simulations and a three-phase prototype test system with a TMS320F28335 DSP.

Keywords: multiple PR regulators; load current observer (LCO); voltage control; three-phase inverter (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2015
References: View complete reference list from CitEc
Citations: View citations in EconPapers (5)

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