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Adaptive-MPPT-Based Control of Improved Photovoltaic Virtual Synchronous Generators

Author

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  • Xiangwu Yan

    (Key Laboratory of Distributed Energy Storage and Micro-Grid of Hebei Province, North China Electric Power University, Baoding 071003, China)

  • Jiajia Li

    (Key Laboratory of Distributed Energy Storage and Micro-Grid of Hebei Province, North China Electric Power University, Baoding 071003, China)

  • Ling Wang

    (Key Laboratory of Distributed Energy Storage and Micro-Grid of Hebei Province, North China Electric Power University, Baoding 071003, China)

  • Shuaishuai Zhao

    (Key Laboratory of Distributed Energy Storage and Micro-Grid of Hebei Province, North China Electric Power University, Baoding 071003, China)

  • Tie Li

    (State Grid Liaoning Electric Power Research Institute, Shenyang 110000, China)

  • Zhipeng Lv

    (China Electric Power Research Institute (CEPRI), Beijing 100192, China)

  • Ming Wu

    (China Electric Power Research Institute (CEPRI), Beijing 100192, China)

Abstract

The lack of inertia and damping mechanism of photovoltaic (PV) grid-connected systems controlled by maximum power point tracking (MPPT) poses a challenge for the safety and stability of the grid. Virtual synchronous generator (VSG) technology has attracted wide attention, since it can make PV grid-connected inverter present the external characteristics of a synchronous generator (SG). Nevertheless, traditional PV-VSG is generally equipped with an energy storage device, which leads to many problems, such as increased costs, space occupation, and post-maintenance. Thus, this paper proposes a two-stage improved PV-VSG control method based on an adaptive-MPPT algorithm. When PV power is adequate, the adaptive-MPPT allows the PV to change the operating point within a stable operation area to actualize system supply-demand, matching in accordance to the load or dispatching power demand; when PV power is insufficient, PV achieves traditional MPPT control to reduce power shortage; simultaneously, improved VSG control prevents the DC bus voltage from falling continuously to ensure its stability. The proposed control approach enables the two-stage PV-VSG to supply power to loads or connect to the grid without adding additional energy storage devices, the effectiveness of which in off-grid and grid-connected modes is demonstrated by typical simulation conditions.

Suggested Citation

  • Xiangwu Yan & Jiajia Li & Ling Wang & Shuaishuai Zhao & Tie Li & Zhipeng Lv & Ming Wu, 2018. "Adaptive-MPPT-Based Control of Improved Photovoltaic Virtual Synchronous Generators," Energies, MDPI, vol. 11(7), pages 1-18, July.
    • Handle: RePEc:gam:jeners:v:11:y:2018:i:7:p:1834-:d:157686
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    References listed on IDEAS

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    3. Muhammad Yasir Ali Khan & Haoming Liu & Zhihao Yang & Xiaoling Yuan, 2020. "A Comprehensive Review on Grid Connected Photovoltaic Inverters, Their Modulation Techniques, and Control Strategies," Energies, MDPI, vol. 13(16), pages 1-40, August.
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    5. Yongbin Wu & Donghui Zhang & Liansong Xiong & Sue Wang & Zhao Xu & Yi Zhang, 2019. "Modeling and Mechanism Investigation of Inertia and Damping Issues for Grid-Tied PV Generation Systems with Droop Control," Energies, MDPI, vol. 12(10), pages 1-17, May.

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