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A Comprehensive Strategy for Accurate Reactive Power Distribution, Stability Improvement, and Harmonic Suppression of Multi-Inverter-Based Micro-Grid

Author

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  • Henan Dong

    (Institute of Electrical Engineering, Shenyang University of Technology, Shenyang 110023, China
    Liaoning Electric Power Company Electric Power Research Institute, State Grid Corporation of China, Shenyang 110006, China)

  • Shun Yuan

    (Institute of Electrical Engineering, Shenyang University of Technology, Shenyang 110023, China
    National Energy Administration, Beijing 100085, China)

  • Zijiao Han

    (Liaoning Electric Power Company, State Grid Corporation of China, Shenyang 110004, China)

  • Zhiyuan Cai

    (Institute of Electrical Engineering, Shenyang University of Technology, Shenyang 110023, China)

  • Guangdong Jia

    (Institute of Electrical Engineering, Shenyang University of Technology, Shenyang 110023, China)

  • Yangyang Ge

    (Liaoning Electric Power Company Electric Power Research Institute, State Grid Corporation of China, Shenyang 110006, China)

Abstract

Among the issues of accurate power distribution, stability improvement, and harmonic suppression in micro-grid, each has been well studied as an individual, and most of the strategies about these issues aim at one inverter-based micro-grid, hence there is a need to establish a model to achieve these functions as a whole, aiming at a multi-inverter-based micro-grid. This paper proposes a comprehensive strategy which achieves this goal successfully; since the output voltage and frequency of micro-grid all consist of fundamental and harmonic components, the strategy contains two parts accordingly. On one hand, a fundamental control strategy is proposed upon the conventional droop control. The virtual impedance is introduced to solve the problem of accurate allocation of reactive power between inverters. Meanwhile, a secondary power balance controller is added to improve the stability of voltage and frequency while considering the aggravating problem of stability because of introducing virtual impedance. On the other hand, the fractional frequency harmonic control strategy is proposed. It can solve the influence of nonlinear loads, micro-grid inverters, and the distribution network on output voltage of inverters, which is focused on eliminating specific harmonics caused by the nonlinear loads, micro-grid converters, and the distribution network so that the power quality of micro-grid can be improved effectively. Finally, small signal analysis is used to analyze the stability of the multi-converter parallel system after introducing the whole control strategy. The simulation results show that the strategy proposed in this paper has a great performance on distributing reactive power, regulating and stabilizing output voltage of inverters and frequency, eliminating harmonic components, and improving the power quality of multi-inverter-based micro-grid.

Suggested Citation

  • Henan Dong & Shun Yuan & Zijiao Han & Zhiyuan Cai & Guangdong Jia & Yangyang Ge, 2018. "A Comprehensive Strategy for Accurate Reactive Power Distribution, Stability Improvement, and Harmonic Suppression of Multi-Inverter-Based Micro-Grid," Energies, MDPI, vol. 11(4), pages 1-16, March.
    • Handle: RePEc:gam:jeners:v:11:y:2018:i:4:p:745-:d:138015
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    References listed on IDEAS

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    Cited by:

    1. Gonzalo Abad & Aitor Laka & Gabriel Saavedra & Jon Andoni Barrena, 2018. "Analytical Modeling Approach to Study Harmonic Mitigation in AC Grids with Active Impedance at Selective Frequencies," Energies, MDPI, vol. 11(6), pages 1-31, May.
    2. Jose R Sicchar & Carlos T. Da Costa & Jose R. Silva & Raimundo C. Oliveira & Werbeston D. Oliveira, 2018. "A Load-Balance System Design of Microgrid Cluster Based on Hierarchical Petri Nets," Energies, MDPI, vol. 11(12), pages 1-30, November.
    3. Zhilin Lyu & Qing Wei & Yiyi Zhang & Junhui Zhao & Emad Manla, 2018. "Adaptive Virtual Impedance Droop Control Based on Consensus Control of Reactive Current," Energies, MDPI, vol. 11(7), pages 1-17, July.

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