弱电网下多逆变器并网系统的全局高频振荡抑制方法

doi:10.19595/j.cnki.1000-6753.tces.181626

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Abstract This paper presents a global high-frequency oscillation suppression method for multi-inverter grid-connected system in weak grid. By introducing the global voltage variable of point of common coupling(PCC) and the high-frequency component of grid-connected current into the inverter control, the high-frequency oscillation suppression of multi-inverter system can be realized. Firstly, the virtual resistance of the paralleled inverter at the PCC was constructed by introducing the feedforward of the PCC voltage, which restrained the harmonic resonance of the impedance network caused by the harmonic voltage of the inverter and the background harmonic voltage of the grid. Secondly, the high-frequency component of grid-connected current was introduced to construct the virtual impedance paralleled to the output filter capacitor of the inverter, which increased the damping of the inverter and restrained the oscillation of the paralleled inverters. Simulations and experiments verified the effectiveness of the proposed method.

Key words： LCL filter resonance paralleled inverters active damping theory

Received: 09 October 2018 Published: 28 February 2020

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TM46

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	Xie Zhiwei
	Chen Yandong
	Wu Wenhua
	Wang Xiangyu
	Wang Zili

Cite this article:

Xie Zhiwei,Chen Yandong,Wu Wenhua等. A Global High-Frequency Oscillation Suppression Method for Multi-Inverter Grid-Connected System in Weak Grid[J]. Transactions of China Electrotechnical Society, 2020, 35(4): 885-895.

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https://dgjsxb.ces-transaction.com/EN/10.19595/j.cnki.1000-6753.tces.181626 OR https://dgjsxb.ces-transaction.com/EN/Y2020/V35/I4/885

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