具有复数滤波器结构锁相环的并网逆变器对弱电网的适应性研究

doi:10.19595/j.cnki.1000-6753.tces.190619

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Abstract According to the traditional synchronous rotating frame PLL (SRF-PLL) grid- connected inverter system, combined with the fundamental positive sequence voltage extraction characteristics of complex coefficient-filter, an grid-connected inverter system with complex coefficient-filter-based PLL (CFPLL-GIS) is constructed. On this basis, considering the influence of PLL, the impedance model of CFPLL-GIS is established. The impedance-based stability criterion analysis shows that the introduction of complex coefficient-filter structure can improve the phase angle of equivalent output impedance of grid-connected inverter system in the middle frequency band, and can significantly improve the adaptability of grid-connected inverter system to weak grid. Meanwhile, taking the loop-gain of the grid-connected inverter system as the design guide, a remodeling control strategy of equivalent output impedance of the grid-connected inverter system is proposed to improve the impedance characteristics of the system, ensuring sufficient stability margin of the grid-connected inverter s

Key words： Weak grid complex coefficient-filter phase locked loop grid-connected inverter impedance criterion impedance remodeling stability margin

Received: 22 May 2019

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TM464

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	Tu Chunming
	Gao Jiayuan
	Li Qing
	Jiang Fei
	Guo Qi

Cite this article:

Tu Chunming,Gao Jiayuan,Li Qing等. Research on Adaptability of Grid-Connected Inverter with Complex Coefficient-Filter Structure Phase Locked Loop to Weak Grid[J]. Transactions of China Electrotechnical Society, 2020, 35(12): 2632-2642.

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https://dgjsxb.ces-transaction.com/EN/10.19595/j.cnki.1000-6753.tces.190619 OR https://dgjsxb.ces-transaction.com/EN/Y2020/V35/I12/2632

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