弱电网下并网逆变器的阻抗相角动态控制方法

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Abstract The grid shows the characteristics of weak grid due to scattered high power distributed power generation device. The grid impedance will affect the robust stability of the grid-connected inverters and lead to harmonic resonance as well as the instability of the system. The output impedance model of LCL-filtered single-phase grid-connected inverter was derived, and the study of stability based on impedance analysis was presented in the paper. In order to increase the phase margin of the grid-connected inverters, a novel impedance phase compensation control strategy was proposed, and the detailed implementation and parameter design of the impedance phase compensation control method was depicted. The effect of PLL loop, digital control delay, and the impedance phase compensation control on the output impedance characteristic was analyzed in quantity. The fundamental frequency phase effect of impedance phase compensation control was also analyzed. Finally combining impulse response based grid impedance online measurement and the impedance-phased dynamic control scheme was introduced, and the effectiveness of the impedance-phased dynamic control was verified by experiment.

Key words： Weak grid grid-connected inverter stability impedance phase compensation impedance-phased dynamic control

Received: 05 July 2015 Published: 19 January 2017

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TM615

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	Zhang Yang
	Chen Xin
	Wang Yun
	Gong Chunying

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Zhang Yang,Chen Xin,Wang Yun等. Impedance-Phased Dynamic Control Method of Grid-Connected Inverters under Weak Grid Condition[J]. Transactions of China Electrotechnical Society, 2017, 32(1): 97-106.

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https://dgjsxb.ces-transaction.com/EN/ OR https://dgjsxb.ces-transaction.com/EN/Y2017/V32/I1/97

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