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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摘要微电网系统中的电力电子接口变换器通常呈并联结构, 且通过LCL滤波器连接到公共母线。LCL滤波器自身具有谐振问题, 特别是在并联逆变器系统中, 频域分析结果中存在额外的正向谐振尖峰和反向谐振尖峰。本文在分析微电网中带有LCL滤波器的并联逆变器系统谐振特性的基础上, 采用基于双二阶滤波器的主动阻尼方法, 在不引入额外的传感器和控制闭环的情况下, 对并联系统中多对不稳定极点同时进行调整。该方法通过在控制系统中添加两对零极点, 改变根轨迹的走向, 使得多对不稳定极点均移动到z平面单位圆之内, 因此系统稳定性得以保证。基于dSPACE1103搭建的实时仿真模型表明了理论分析结果。

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	陆晓楠
	孙凯
	黄立培

关键词 ：双二阶滤波器, 主动阻尼, LCL滤波器, 微电网

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

收稿日期: 2012-09-20 出版日期: 2014-03-25

PACS:

TM46

基金资助:国家自然科学基金资助项目（51177083）

作者简介: 陆晓楠男, 1985年生, 博士研究生, 研究方向为电力电子变换器控制。孙凯男, 1977年生, 副教授, 研究方向为电力电子变换器控制及电机控制。

引用本文:

陆晓楠, 孙凯, 黄立培. 微电网系统中基于双二阶滤波器的主动阻尼方法[J]. 电工技术学报, 2013, 28(3): 261-268. Lu Xiaonan, Sun Kai, Huang Lipei. Active Damping Method Based on Bi-Quad Filter for Microgrid Applications. Transactions of China Electrotechnical Society, 2013, 28(3): 261-268.

链接本文:

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

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