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

Department of Electrical Engineering, Southeast University, No. 2 Sipailou, Nanjing 210096, China
State Grid Zhejiang Electric Power Research Institute, Hangzhou 310014, China
Author to whom correspondence should be addressed.
These authors contributed equally to this work.
Academic Editor: Thorsten Staake
Energies 2015, 8(8), 7542-7562;
Received: 14 April 2015 / Revised: 18 June 2015 / Accepted: 15 July 2015 / Published: 24 July 2015
(This article belongs to the Special Issue Smart Metering)
PDF [2044 KB, uploaded 24 July 2015]


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. View Full-Text
Keywords: multiple PR regulators; load current observer (LCO); voltage control; three-phase inverter multiple PR regulators; load current observer (LCO); voltage control; three-phase inverter

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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).

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Dou, X.; Yang, K.; Quan, X.; Hu, Q.; Wu, Z.; Zhao, B.; Li, P.; Zhang, S.; Jiao, Y. An Optimal PR Control Strategy with Load Current Observer for a Three-Phase Voltage Source Inverter. Energies 2015, 8, 7542-7562.

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