三相并网逆变器LCL滤波器的研究及新型有源阻尼控制

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Abstract Compared with the traditional L type filter, LCL type filter is more suitable for three-phase grid-connected inverter which used in the high-power because of its lower cost and good performance in harmonic suppression. The variation of net impedance is analyzed according to the different positions of voltage and current sensors in the inverter. The stabilization analysis of system is also discussed on the paper in different current control ways. To the question of resonance in the LCL filter and the application of passive damped resistor will cause the power loss and affect the system efficiency, the system control models and transfer functions which based LCL filter capacitor-series and parallel damped resistor are constructed. According to the principle of equivalent function, the system control strategy which based on LCL filter capacitor-series and parallel active virtual damped resistor is obtained with the feedback of filter capacitor voltage on this paper. The control strategy which based on LCL filter capacitor-parallel active virtual damped resistor is verified in the Matlab/Simulink and experiment. The results of simulation and experiment show the current of grid is stabilization and low THD, and the system power loss is not increased at the same time.

Key words： Grid-connected inverter stabilization analysis LCL filter active virtual damped resistor control strategy

Received: 20 September 2012 Published: 05 November 2014

PACS:	TM641
	TM46

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	Chen Xin
	Wei Zheng
	Hu Xuefeng
	Cen Yihan
	Gong Chunying

Cite this article:

Chen Xin,Wei Zheng,Hu Xuefeng等. Research on LCL Filter in Three-Phase Grid-Connected Inverter and Novel Active Damping Control Strategy[J]. Transactions of China Electrotechnical Society, 2014, 29(6): 71-79.

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http://dgjsxb.ces-transaction.com/EN/ OR http://dgjsxb.ces-transaction.com/EN/Y2014/V29/I6/71

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