期刊
IEEE TRANSACTIONS ON INDUSTRIAL INFORMATICS
卷 18, 期 6, 页码 3958-3969出版社
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/TII.2021.3110951
关键词
Impedance; Voltage control; Transient analysis; Regulation; Inverters; Microgrids; Wires; Adaptive virtual impedance; current sharing; islanded ac microgrid; iterative virtual impedance regulation (IVIR); parallel-connected inverters
类别
资金
- National Natural Science Foundation of China [52007154]
- Central University Basic Research Fund of China [G2020KY05107, TII-21-2625]
This article proposes a decentralized current sharing strategy based on iterative virtual impedance regulation (IVIR) to improve current sharing accuracy in islanded microgrids. The strategy eliminates impedance mismatches, accurately distributes current components, and maintains good voltage quality through several continuous iterations, without requiring communication or grid impedance knowledge.
The output impedances of inverters can be reshaped to improve current sharing accuracy in islanded microgrids. This article proposes a decentralized current sharing strategy based on iterative virtual impedance regulation (IVIR). The whole IVIR process is decomposed into several continuous iterations. During each iteration, three stages are involved. In the first stage, a virtual impedance increment is generated with the integral of the inverter uniform output currents. Then, an impedance compensation is introduced to restore the voltage magnitude in the second stage. In the third stage, the current sharing error is evaluated. Based on this iterative regulation, the impedance mismatches are eliminated with small virtual impedances, all the balanced, unbalanced, and harmonic current components are distributed accurately, and good voltage quality maintains. The proposed control strategy requires neither communication nor grid impedance knowledge. Simulation and experimental results are presented to verify the effectiveness of the proposed strategy.
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