Journal
IEEE TRANSACTIONS ON SMART GRID
Volume 13, Issue 6, Pages 4245-4255Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/TSG.2022.3184911
Keywords
Inverters; Oscillators; Voltage control; Microgrids; Reactive power; Voltage; Power harmonic filters; Grid-forming inverters; Hopf oscillator; unbalanced-voltage compensation
Categories
Funding
- National Natural Science Foundation of China [51877130]
- National Key Research and Development Project of China [2017YFGH001164]
- Program Bilateral and Multilateral Research and Technology Co-Operation Between Greece and China [2017YFGH001164, eSOLAR/T7 DeltaKI-00066]
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This paper proposes a novel unbalanced-voltage compensation control method based on the Hopf oscillator and verifies its effectiveness through experiments.
In islanded microgrids, distributed generators (DGs) are employed as distributed compensators to improve the power quality on the load side. Due to the access of unbalanced loads, the low-voltage microgrid will naturally exhibit three-phase unbalance, which may cause additional power losses and deteriorate power quality. Therefore, this paper proposes a novel unbalanced-voltage compensation control method based on the Hopf oscillator, which introduces the negative-sequence voltage and current into the traditional Hopf oscillator to achieve the negative sequence voltage droop characteristics. It can not only realize the negative sequence droop control of a single inverter, but it is also capable to support the reactive power automatic distribution between multi-parallel grid-forming inverters. Compared with the traditional unbalanced voltage compensation method based on filtered negative sequence reactive power, the proposed unbalanced voltage compensation method can slightly improve the dynamic response. Experimental results verify the effectiveness of the proposed control strategy.
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