微电网系统中基于双二阶滤波器的主动阻尼方法

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Abstract The power electronics interfacing converters are usually parallel connected to the common bus via LCL filters in a microgrid. The LCL filters have resonance problems. Especially in a parallel inverter system, the additional resonance and anti-resonance peaks can be found in the frequency domain analysis result. In this paper, the frequency domain characteristic of the parallel LCL-filtered inverters is analyzed. Active damping method based on bi-quad filter is reached. By using this kind of method, the multiple poles leading to instability issues are damped at the same time without additional sensors and close-loops in the control system. The additional two pairs of zeros and poles are involved by the bi-quad filter. Hence, the original root locus is changed and the multiple pairs of unstable poles are moved into the unit circle in z domain. The system stability is thereby guaranteed. The theoretical analysis is showed by the model with three LCL filtered parallel inverters implemented in dSPACE1103.

Key words： Bi-quad filter active damping LCL filter microgrids

Received: 20 September 2012 Published: 25 March 2014

PACS:

TM46

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	Lu Xiaonan
	Sun Kai
	Huang Lipei

Cite this article:

Lu Xiaonan,Sun Kai,Huang Lipei. Active Damping Method Based on Bi-Quad Filter for Microgrid Applications[J]. Transactions of China Electrotechnical Society, 2013, 28(3): 261-268.

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http://dgjsxb.ces-transaction.com/EN/ OR http://dgjsxb.ces-transaction.com/EN/Y2013/V28/I3/261

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