断路器保护特性测试电流的自适应控制策略

doi:10.19595/j.cnki.1000-6753.tces.200138

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Abstract Current converter is the core device to test the protection characteristics of circuit breaker. The existing test methods lack power factor adjustment. The current accuracy and stability also need to be improved. An adaptive control strategy for the circuit breaker testing application is proposed, in which a two-stage dual closed-loop control method is presented based on the front-stage fuzzy control and the post-stage impedance compensation. For the front-stage power factor compensation unit, the tracking error is introduced into the Sugeno-type fuzzy control to compensate the front-stage DC voltage tracking. At the post stage, a discrete impedance integration method is used to adaptively calculate the load impedance and an impedance compensation is then performed to improve current accuracy. The power factor correction and current accuracy are compared via both simulation and experiments. Comparison results show that compared with conventional method, the proposed strategy is able to reduce the current error from 3% to 1.2%. The maximum reduction ratio of THD is up to 17.1 %, which is significant to reduce the current distortion and grid harmonics.

Key words： Circuit breaker power factor correction current converter fuzzy control

Received: 14 February 2020

PACS:

TM561.1

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	Articles by authors
	You Yingmin
	Wang Jingqin
	Shu Liang
	Zhang Haigen
	Chen Chong

Cite this article:

You Yingmin,Wang Jingqin,Shu Liang等. Research on Adaptive Current Control Method in Circuit Breaker Protection Characteristic Test[J]. Transactions of China Electrotechnical Society, 2020, 35(15): 3203-3213.

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https://dgjsxb.ces-transaction.com/EN/10.19595/j.cnki.1000-6753.tces.200138 OR https://dgjsxb.ces-transaction.com/EN/Y2020/V35/I15/3203

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