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Improved Capacitor Voltage Feedforward for Three-Phase LCL-Type Grid-Connected Converter to Suppress Start-Up Inrush Current

Author

Listed:
  • Shiying Zhou

    (State Key Laboratory of Advanced Electromagnetic Engineering and Technology, School of Electrical and Electronic Engineering, Huazhong University of Science and Technology, Wuhan 430074, China)

  • Xudong Zou

    (State Key Laboratory of Advanced Electromagnetic Engineering and Technology, School of Electrical and Electronic Engineering, Huazhong University of Science and Technology, Wuhan 430074, China)

  • Donghai Zhu

    (State Key Laboratory of Advanced Electromagnetic Engineering and Technology, School of Electrical and Electronic Engineering, Huazhong University of Science and Technology, Wuhan 430074, China)

  • Li Tong

    (Zhejiang Electric Power Corporation Research Institute, Hangzhou 310014, China)

  • Yong Kang

    (State Key Laboratory of Advanced Electromagnetic Engineering and Technology, School of Electrical and Electronic Engineering, Huazhong University of Science and Technology, Wuhan 430074, China)

Abstract

Three-phase active damping LCL-type grid-connected converters are usually used in distributed power generation systems. However, serious inrush current will be aroused when the grid-connected converter starts, especially in rectifier mode, if no effective control method is taken. The point of common coupling (PCC) voltage feedforward is usually used to suppress start-up inrush current. Unfortunately, it will introduce a positive feedback loop related to the grid current and grid impedance under weak grid conditions, and therefore, the grid current will be distorted and the system stability margin will be significantly reduced. To solve the above problems, this paper proposes a simple method based on a d -axis fundamental positive-sequence component of filter capacitor voltage feedforward, without extra sensors and software resources. With the proposed method, it is possible to suppress the start-up inrush current and maintain the grid current quality and system stability under weak grid conditions. The mechanism of start-up inrush current and the effectiveness of the method for inrush current suppression are analyzed in detail. Then, the influences of different feedforward methods on system stability are analyzed under weak grid conditions by the impedance model of grid-connected converter. Finally, experimental results verify the validity of the proposed method.

Suggested Citation

  • Shiying Zhou & Xudong Zou & Donghai Zhu & Li Tong & Yong Kang, 2017. "Improved Capacitor Voltage Feedforward for Three-Phase LCL-Type Grid-Connected Converter to Suppress Start-Up Inrush Current," Energies, MDPI, vol. 10(5), pages 1-19, May.
    • Handle: RePEc:gam:jeners:v:10:y:2017:i:5:p:713-:d:98989
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    References listed on IDEAS

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    1. 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.
    2. Yanxue Yu & Haoyu Li & Zhenwei Li & Zhou Zhao, 2017. "Modeling and Analysis of Resonance in LCL-Type Grid-Connected Inverters under Different Control Schemes," Energies, MDPI, vol. 10(1), pages 1-17, January.
    3. Weiyi Zhang & Daniel Remon & Antoni M. Cantarellas & Pedro Rodriguez, 2016. "A Unified Current Loop Tuning Approach for Grid-Connected Photovoltaic Inverters," Energies, MDPI, vol. 9(9), pages 1-19, September.
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    Cited by:

    1. Cheng Nie & Yue Wang & Wanjun Lei & Tian Li & Shiyuan Yin, 2018. "Modeling and Enhanced Error-Free Current Control Strategy for Inverter with Virtual Resistor Damping," Energies, MDPI, vol. 11(10), pages 1-15, September.

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