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

Author

Listed:
  • 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
    These authors contributed equally to this work.)

  • Xiangjun Quan

    (Department of Electrical Engineering, Southeast University, No. 2 Sipailou, Nanjing 210096, China
    These authors contributed equally to this work.)

  • 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)

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.

Suggested Citation

  • Xiaobo Dou & Kang Yang & Xiangjun Quan & Qinran Hu & Zaijun Wu & Bo Zhao & Peng Li & Shizhan Zhang & Yang Jiao, 2015. "An Optimal PR Control Strategy with Load Current Observer for a Three-Phase Voltage Source Inverter," Energies, MDPI, vol. 8(8), pages 1-21, July.
    • Handle: RePEc:gam:jeners:v:8:y:2015:i:8:p:7542-7562:d:53153
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    Citations

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    Cited by:

    1. Junhui Li & Tianyang Zhang & Lei Qi & Gangui Yan, 2017. "A Method for the Realization of an Interruption Generator Based on Voltage Source Converters," Energies, MDPI, vol. 10(10), pages 1-19, October.
    2. Syed Sabir Hussain Bukhari & Shahid Atiq & Byung-il Kwon, 2016. "Elimination of the Inrush Current Phenomenon Associated with Single-Phase Offline UPS Systems," Energies, MDPI, vol. 9(2), pages 1-16, February.
    3. Rizka Bimarta & Thuy Vi Tran & Kyeong-Hwa Kim, 2018. "Frequency-Adaptive Current Controller Design Based on LQR State Feedback Control for a Grid-Connected Inverter under Distorted Grid," Energies, MDPI, vol. 11(10), pages 1-29, October.
    4. Botong Li & Jianfei Jia & Shimin Xue, 2016. "Study on the Current-Limiting-Capable Control Strategy for Grid-Connected Three-Phase Four-Leg Inverter in Low-Voltage Network," Energies, MDPI, vol. 9(9), pages 1-18, September.
    5. Zhun Meng & Yi-Feng Wang & Liang Yang & Wei Li, 2017. "High Frequency Dual-Buck Full-Bridge Inverter Utilizing a Dual-Core MCU and Parallel Algorithm for Renewable Energy Applications," Energies, MDPI, vol. 10(3), pages 1-18, March.

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