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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摘要相比较传统的L型滤波器,LCL滤波器以其较低的成本和更好的高次滤波衰减能力适合应用于大功率场合下的三相并网逆变器。文章详细分析了根据逆变器电压电流传感器安装位置不同导致网侧等效阻抗的变化以及对并网逆变器采用不同电流控制方式时的系统稳定性。针对LCL滤波器本身存在的谐振问题以及传统的增加滤波器无源阻尼电阻会带来系统额外的功率损耗,降低变流器效率等缺点,文章通过建立基于LCL滤波器滤波电容串联和并联阻尼电阻的系统控制模型,构建系统传递函数并利用系统传函等效原则,选择滤波电容电压前馈分别实现基于有源虚拟阻尼电阻串联和并联的LCL滤波器系统控制方案,给出前馈系数计算方法。最后通过仿真和实验验证了采用基于有源虚拟阻尼电阻并联LCL滤波的三相并网逆变器控制策略,仿真和实验结果表明在不增加系统额外功率损耗的同时,逆变器并网电流工作稳定且谐波含量低。

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	龚春英

关键词 ：并网逆变器, 稳定性分析, LCL滤波器, 有源虚拟阻尼电阻, 控制策略

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

收稿日期: 2012-09-20 出版日期: 2014-11-05

PACS:	TM641
	TM46

基金资助:江苏省新能源发电与电能变换重点实验室开放研究基金,光宝电力电子技术科研基金和江苏省基础研究计划（自然科学基金）（BK20131360）资助项目

作者简介: 陈新男,1973年生,博士,副教授,主要研究方向为功率电子变换技术和新能源发电控制技术。韦徵男,1982年生,博士研究生,主要研究方向为功率电子变换技术。（通讯作者）

引用本文:

陈新, 韦徵, 胡雪峰, 陈轶涵, 龚春英. 三相并网逆变器LCL滤波器的研究及新型有源阻尼控制[J]. 电工技术学报, 2014, 29(6): 71-79. Chen Xin, Wei Zheng , Hu Xuefeng , Cen Yihan , Gong Chunying. Research on LCL Filter in Three-Phase Grid-Connected Inverter and Novel Active Damping Control Strategy. Transactions of China Electrotechnical Society, 2014, 29(6): 71-79.

链接本文:

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

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