Research on Adaptability of Grid-Connected Inverter with Complex Coefficient-Filter Structure Phase Locked Loop to Weak Grid
Tu Chunming1, Gao Jiayuan1, Li Qing1, Jiang Fei2, Guo Qi1
1. National Electric Power Conversion and Control Engineering Technology Research Center Hunan University Changsha 410082 China; 2. School of Electrical and Information Engineering Changsha University of Science and Technology Changsha 410004 China
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
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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2020, Vol. 35 
