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Study on the Current-Limiting-Capable Control Strategy for Grid-Connected Three-Phase Four-Leg Inverter in Low-Voltage Network

Author

Listed:
  • Botong Li

    (The Key Laboratory of Smart Grid of Ministry of Education, Tianjin University, Tianjin 300072, China)

  • Jianfei Jia

    (The Key Laboratory of Smart Grid of Ministry of Education, Tianjin University, Tianjin 300072, China)

  • Shimin Xue

    (The Key Laboratory of Smart Grid of Ministry of Education, Tianjin University, Tianjin 300072, China)

Abstract

The three-phase four-leg inverter can produce balanced voltages even with unbalanced loads, yet its controller design is quite complicated. Based on the analysis on time domain equations, a decoupled sequence control strategy for the three-phase four-leg inverter in a low-voltage network is proposed. A negative sequence controller and a zero sequence controller are added to the control strategy besides the positive sequence controller. Furthermore, considering the output limit of the inverter, a current limit design scheme is raised through the analysis on each sequence current in synchronous rotating frame. In the case of asymmetry, the limit value of each sequence current can be adjusted dynamically according to the design scheme. The output currents in each sequence can be controlled and limited for different purposes respectively. Finally, simulation results based on PSCAD/EMTDC V4.5.0 verify the validity of the control strategy.

Suggested Citation

  • 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.
    • Handle: RePEc:gam:jeners:v:9:y:2016:i:9:p:726-:d:77774
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    References listed on IDEAS

    as
    1. Miveh, Mohammad Reza & Rahmat, Mohd Fadli & Ghadimi, Ali Asghar & Mustafa, Mohd Wazir, 2016. "Control techniques for three-phase four-leg voltage source inverters in autonomous microgrids: A review," Renewable and Sustainable Energy Reviews, Elsevier, vol. 54(C), pages 1592-1610.
    2. 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.
    3. Ngoc Bao Lai & Kyeong-Hwa Kim, 2016. "An Improved Current Control Strategy for a Grid-Connected Inverter under Distorted Grid Conditions," Energies, MDPI, vol. 9(3), pages 1-23, March.
    4. Ningyun Zhang & Houjun Tang & Chen Yao, 2014. "A Systematic Method for Designing a PR Controller and Active Damping of the LCL Filter for Single-Phase Grid-Connected PV Inverters," Energies, MDPI, vol. 7(6), pages 1-21, June.
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    Cited by:

    1. Galo Guarderas & Airan Frances & Dionisio Ramirez & Rafael Asensi & Javier Uceda, 2019. "Blackbox Large-Signal Modeling of Grid-Connected DC-AC Electronic Power Converters," Energies, MDPI, vol. 12(6), pages 1-22, March.
    2. Yixiao Luo & Chunhua Liu & Feng Yu & Christopher H.T. Lee, 2017. "Design and Evaluation of an Efficient Three-Phase Four-Leg Voltage Source Inverter with Reduced IGBTs," Energies, MDPI, vol. 10(4), pages 1-14, April.

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