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Applying Directly Modified RDFT Method in Active Power Filter for the Power Quality Improvement of the Weak Power Grid

Author

Listed:
  • Rui Hou

    (School of Information and Control Engineering, Qingdao University of Technology, Qingdao 266525, China)

  • Jian Wu

    (School of Electrical Engineering and Automation, Harbin Institute of Technology, Harbin 150001, China)

  • Huihui Song

    (School of Electrical Engineering and Automation, Harbin Institute of Technology, Harbin 150001, China)

  • Yanbin Qu

    (School of Electrical Engineering and Automation, Harbin Institute of Technology, Harbin 150001, China)

  • Dianguo Xu

    (School of Electrical Engineering and Automation, Harbin Institute of Technology, Harbin 150001, China)

Abstract

The recursive discrete Fourier transformation (RDFT) method can be used for grid voltage phase-locking and harmonic current detection in a shunt active power filter (SAPF). However, in weak power grids such as microgrids, significant errors might occur in the amplitude and phase detection due to grid frequency deviation. In this study, to resolve this problem, a directly modified RDFT (DMRDFT) method is proposed for SAPF weak grid application. Through theoretical analysis, the errors of phase and amplitude detection were found to consist of fixed error and fluctuating error. The fixed error is only determined by frequency deviation, whereas the fluctuating error is also related to the recursive pointer and the initial phase. The DMRDFT algorithm can obtain the real grid frequency through the calculation of the phase angle difference for two consecutive periods. Then it can employ the grid frequency deviation and the recursive pointer value to directly correct the detection results gathered by the conventional RDFT algorithm. As a result, DMRDFT can yield accurate amplitude and phase information of the grid voltage or current with a simple calculation. Simulation results verify the high precision of the proposed DMRDFT method in both steady and dynamic situations. Experimental results show that the DMRDFT method can significantly increase the SAPF compensation performance when grid frequency shifts.

Suggested Citation

  • Rui Hou & Jian Wu & Huihui Song & Yanbin Qu & Dianguo Xu, 2020. "Applying Directly Modified RDFT Method in Active Power Filter for the Power Quality Improvement of the Weak Power Grid," Energies, MDPI, vol. 13(18), pages 1-20, September.
    • Handle: RePEc:gam:jeners:v:13:y:2020:i:18:p:4884-:d:415238
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    References listed on IDEAS

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    1. Felipe J. Zimann & Eduardo V. Stangler & Francisco A. S. Neves & Alessandro L. Batschauer & Marcello Mezaroba, 2020. "Coordinated Control of Active and Reactive Power Compensation for Voltage Regulation with Enhanced Disturbance Rejection Using Repetitive Vector-Control," Energies, MDPI, vol. 13(11), pages 1-18, June.
    2. Mihaela Popescu & Alexandru Bitoleanu & Constantin Vlad Suru & Mihaita Linca & Gheorghe Eugen Subtirelu, 2020. "Adaptive Control of DC Voltage in Three-Phase Three-Wire Shunt Active Power Filters Systems," Energies, MDPI, vol. 13(12), pages 1-24, June.
    3. Yunguang Gao & Xiaofan Li & Wenjie Zhang & Dianchao Hou & Lijun Zheng, 2020. "A Sliding Mode Control Strategy with Repetitive Sliding Surface for Shunt Active Power Filter with an LCLCL Filter," Energies, MDPI, vol. 13(7), pages 1-21, April.
    4. Dong Wang & Xiaojie Zhang & Lei Yang & Yunhui Huang & Wei Huang & Chen Wu & Shengnan Li, 2020. "Analysis of Synchronization Stability for Multi VSCs Parallel-Connected to Weak Grids by Improved Net Damping Criterion," Energies, MDPI, vol. 13(13), pages 1-16, June.
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    Cited by:

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    2. Janusz Mindykowski & Tomasz Tarasiuk & Piotr Gnaciński, 2021. "Review of Legal Aspects of Electrical Power Quality in Ship Systems in the Wake of the Novelisation and Implementation of IACS Rules and Requirement," Energies, MDPI, vol. 14(11), pages 1-21, May.

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