Journal
IET GENERATION TRANSMISSION & DISTRIBUTION
Volume 12, Issue 5, Pages 1198-1205Publisher
INST ENGINEERING TECHNOLOGY-IET
DOI: 10.1049/iet-gtd.2017.1036
Keywords
reactive power control; decentralised control; adaptive control; power system stability; invertors; decentralised control; adaptive virtual impedance design principle; droop control strategy; microgrid; reactive power sharing ratio; inductive virtual impedance design principle; small signal stability; inverter
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Funding
- National key research and development program of China [2016YFB0900605]
- science and technology project of SGCC [SGZJ0000BGJS1600312]
- National Natural Science Foundation of China [51377142]
- planning and analysis of distribution network in Jilin province China [JLZB-17JNG1501]
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The droop control strategy has been widely used in the microgrid. Though the real power sharing is accurate, the performance of reactive power sharing is not good due to the lack of global information. A new control strategy that employs an adaptive virtual impedance is proposed to improve the reactive power sharing accuracy without communication. In the proposed controller, reactive power sharing is realised through the adaptive virtual impedance, whose coefficient is set to the square of the reactive power sharing ratio. Only inductive virtual impedance is adopted by using the absolute value of the reactive power. The proposed controller only uses local information. Its reactive power sharing accuracy and the virtual impedance design principle are analysed and explained. Small signal stability of an inverter equipped with the proposed controller is analysed. It has been shown that the reactive power sharing error of the proposed controller could be reduced by less about 50% compared to conventional droop control. Real-time simulation results are submitted to verify the effectiveness.
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