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Zero-Axis Virtual Synchronous Coordinate Based Current Control Strategy for Grid-Connected Inverter

Author

Listed:
  • Longyue Yang

    (School of Electrical and Power Engineering, China University of Mining and Technology, Xuzhou 221116, China)

  • Chunchun Feng

    (School of Electrical and Power Engineering, China University of Mining and Technology, Xuzhou 221116, China)

  • Yan Zhao

    (School of Electrical and Power Engineering, China University of Mining and Technology, Xuzhou 221116, China)

  • Jianhua Liu

    (School of Electrical and Power Engineering, China University of Mining and Technology, Xuzhou 221116, China)

Abstract

Unbalanced power has a great influence on the safe and stable operation of the distribution network system. The static power compensator, which is essentially a grid-connected inverter, is an effective solution to the three-phase power imbalance problem. In order to solve the tracking error problem of zero-sequence AC current signals, a novel control strategy based on zero-axis virtual synchronous coordinates is proposed in this paper. By configuring the operation of filter transmission matrices, a specific orthogonal signal is obtained for zero-axis reconstruction. In addition, a controller design scheme based on this method is proposed. Compared with the traditional zero-axis direct control, this control strategy is equivalent to adding a frequency tuning module by the orthogonal signal generator. The control gain of an open loop system can be equivalently promoted through linear transformation. With its clear mathematical meaning, zero- sequence current control can be controlled with only a first-order linear controller. Through reasonable parameter design, zero steady-state error, fast response and strong stability can be achieved. Finally, the performance of the proposed control strategy is verified by both simulations and experiments.

Suggested Citation

  • Longyue Yang & Chunchun Feng & Yan Zhao & Jianhua Liu, 2018. "Zero-Axis Virtual Synchronous Coordinate Based Current Control Strategy for Grid-Connected Inverter," Energies, MDPI, vol. 11(5), pages 1-26, May.
    • Handle: RePEc:gam:jeners:v:11:y:2018:i:5:p:1225-:d:145681
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    References listed on IDEAS

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    1. Borzou Yousefi & Soodabeh Soleymani & Babak Mozafari & Seid Asghar Gholamian, 2017. "Speed Control of Matrix Converter-Fed Five-Phase Permanent Magnet Synchronous Motors under Unbalanced Voltages," Energies, MDPI, vol. 10(10), pages 1-21, September.
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