基于带不平衡度非线性正反馈的负序电流扰动孤岛检测方法

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Abstract Islanding detection is an essential function of grid-connected inverters. Its basic requirement is to detect islanding state without non-detection zone (NDZ) within the specified time and minimize the impacts on power quality. With its unique advantages in rapid detection, high efficiency and no NDZ, the negative-sequence current perturbation method is widely used. However, because of the fluctuations arising from unbalance factor of grid voltage, the negative-sequence current perturbation method with positive feedback of unbalance factor will affect the symmetry of grid current. Thus, this paper proposes a novel islanding detection with nonlinear positive feedback, which injects less negative-sequence perturbation current. The feedback function is greater than the positive feedback threshold and is less than the restrictive value under the maximum unbalance factor of grid voltage. The proposed method can not only detect islanding successfully, but also quantitatively restrain the unbalance factor of grid current. Theoretical analysis, simulation and experimental results verify the correctness and feasibility of the method.

Key words： Islanding detection grid-connected inverter negative-sequence current unbalance factor nonlinear positive feedback

Received: 04 May 2014 Published: 28 July 2016

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TM615

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	Articles by authors
	Ding Hao
	Wei Yanjun
	He Yu
	Zhang Di
	Qi Hanhong
	Zhang Jinlong

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Ding Hao,Wei Yanjun,He Yu等. Negative-Sequence Current Perturbation Islanding Detection Method with Nonlinear Positive Feedback of Unbalance Degree[J]. Transactions of China Electrotechnical Society, 2016, 31(14): 211-218.

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https://dgjsxb.ces-transaction.com/EN/ OR https://dgjsxb.ces-transaction.com/EN/Y2016/V31/I14/211

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