4.8 Article

A Virtual Complex Impedance Based P - (V) over dot Droop Method for Parallel-Connected Inverters in Low-Voltage AC Microgrids

期刊

IEEE TRANSACTIONS ON INDUSTRIAL INFORMATICS
卷 17, 期 3, 页码 1763-1773

出版社

IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/TII.2020.2997054

关键词

Droop control; low-voltage ac microgrid; power-sharing; virtual impedance

资金

  1. National Natural Science Foundation of China [61533010, 61833008, 61933005]

向作者/读者索取更多资源

A new P-(V) droop method is proposed in this article to decouple the power of distributed generators in low-voltage microgrids, improving power-sharing accuracy. It utilizes virtual complex impedance, restoration mechanism, and modified strategy to ensure grid stability and achieve efficient power sharing.
Due to the high R/X ratio and mismatched feeder impedance of low-voltage microgrids, conventional droop method is no longer able to decouple the active and reactive power of distributed generators and the powersharing accuracy is degraded. In this article, a virtual complex impedance based P - (V) over dot droop method is proposed to decouple the powers and improve the power-sharing accuracy among DGs. With the virtual impedance method, the equivalent impedance between virtual power source and point of common coupling is shaped to be purely resistive. Then, a P - (V) over dot strategy is adopted to alleviate the effect of mismatched line impedance, where the virtual powers rather than the ordinary P/Q are used in the droop equation. In case the output voltage violates the operation code, a restoration mechanism is proposed to reset (V) over dot to zero. Compared with existing virtual impedance and Q - (V) over dot droop methods, the proposed method combines the advantages of both. Besides, a modified P - (V) over dot strategy is also presented to accelerate the restoration process and improve the active power-sharing accuracy at the same time. Simulation results validate the effectiveness of the proposed method.

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