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A Comprehensive VSM Control Strategy Designed for Unbalanced Grids

Author

Listed:
  • Huiyu Miao

    (School of Electrical Engineering, Southeast University, Nanjing 210096, China)

  • Fei Mei

    (College of Energy and Electrical Engineering, Hohai University, Nanjing 210098, China)

  • Yun Yang

    (School of Electrical Engineering, Southeast University, Nanjing 210096, China)

  • Hongfei Chen

    (School of Electrical Engineering, Southeast University, Nanjing 210096, China)

  • Jianyong Zheng

    (School of Electrical Engineering, Southeast University, Nanjing 210096, China)

Abstract

A virtual synchronous machine (VSM) is a converter which, compared to other types of converters, has more friendly interactions with the power grid because it is able to simulate the external characteristics of a synchronous machine, which can provide virtual inertia and damping. When the grid voltage is unbalanced, there will be negative sequence current and power oscillations. There will also be double-frequency ripples on the DC bus, which affect the normal operation of the DC power source or load. In order to solve these problems, a comprehensive control strategy is proposed in this paper. The principle of a VSM operated as a current source converter, also called VISMA, is used in the design. A complex coefficient filter is applied to separate the positive and negative sequence components of the grid voltage. By analyzing the reasons of power oscillations under unbalanced voltage, the electrical simulation part of the VSM is improved to achieve several objectives: to suppress negative sequence current and DC voltage ripples. Additionally, the rated voltage in the reactive control part is adaptively adjusted to stabilize the system. The validity of the proposed control strategy is verified by simulation and experiment.

Suggested Citation

  • Huiyu Miao & Fei Mei & Yun Yang & Hongfei Chen & Jianyong Zheng, 2019. "A Comprehensive VSM Control Strategy Designed for Unbalanced Grids," Energies, MDPI, vol. 12(6), pages 1-17, March.
    • Handle: RePEc:gam:jeners:v:12:y:2019:i:6:p:1169-:d:217176
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    References listed on IDEAS

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    1. Cao-Khang Nguyen & Thai-Thanh Nguyen & Hyeong-Jun Yoo & Hak-Man Kim, 2017. "Improving Transient Response of Power Converter in a Stand-Alone Microgrid Using Virtual Synchronous Generator," Energies, MDPI, vol. 11(1), pages 1-17, December.
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    Cited by:

    1. Solomon Feleke & Balamurali Pydi & Raavi Satish & Hossam Kotb & Mohammed Alenezi & Mokhtar Shouran, 2023. "Frequency Stability Enhancement Using Differential-Evolution- and Genetic-Algorithm-Optimized Intelligent Controllers in Multiple Virtual Synchronous Machine Systems," Sustainability, MDPI, vol. 15(18), pages 1-18, September.

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