基于有源钳位的无变压器型单相光伏并网逆变器

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Abstract The DC-AC decoupling technique is usually adopted in conventional transformerless photovoltaic inverter to suppress the leakage current induced by the common-mode voltage variation. However, the leakage current still exists due to the existence of the parasitic parameters of the circuit. A novel transformerless inverter is proposed for photovoltaic grid-connected systems, which suppresses the leakage current by clamping the common-mode voltage to half of the input dc voltage. The proposed topology can also achieve the high efficiency due to the low conducting losses. Besides, a PWM control method is given out for the inverter according to the analysis of the operational principle. Furthermore, comparison among several topologies is presented to explore the performance of the proposed topology. Finally, a 2kW prototype is built to verify the effectiveness of the inverter.

Key words： Leakage current transformerless photovoltaic grid-connected inverter active clamp

Received: 28 March 2014 Published: 14 September 2015

PACS:

TM464

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	Articles by authors
	Cui Wenfeng
	Hu Sengjun
	Li Wuhua
	He Xiangning
	Cao Fengwen

Cite this article:

Cui Wenfeng,Hu Sengjun,Li Wuhua等. An Active Voltage Clamp Transformerless Inverter for Single-Phase Photovoltaic Grid-Connected Systems[J]. Transactions of China Electrotechnical Society, 2015, 30(16): 26-32.

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https://dgjsxb.ces-transaction.com/EN/ OR https://dgjsxb.ces-transaction.com/EN/Y2015/V30/I16/26

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