单相LCL型并网逆变器新型谐波阻尼策略  

New Harmonic Damping Strategy for Single Grid-connected Inverter With LCL Filter

作　　者：王逸超[1] 罗安[1] 金国彬[1] 吕志鹏[2] 

机构地区：[1]国家电能变换与控制工程技术研究中心(湖南大学),湖南省长沙市410082 [2]中国电力科学研究院,北京市海淀区100192

出　　处：《中国电机工程学报》2014年第33期5803-5810,共8页Proceedings of the CSEE

基　　金：国家自然科学基金重点项目(51237003)~~

摘　　要：LCL型并网逆变器对高频谐波的衰减效果显著,但对电网背景谐波电压和来源于指令信号谐波成分的抑制能力有限。为了提高入网电流对谐波干扰的抑制能力,在分析常规电流跟踪控制策略的基础上,提出一种直接控制入网电流的单相LCL型并网逆变器新型谐波阻尼策略。分析新型谐波阻尼策略中闭环参数对系统性能的影响,给出控制参数的设计方案。通过频域分析、仿真和实验结果表明,所提新型谐波阻尼策略可有效增强入网电流对电网背景谐波电压和来源于指令信号谐波成分的抑制能力,实现输出高品质入网电流的控制目标。The grid-connected inverter with LCL filter has the ability of easily attenuating the high frequency current harmonics. However, the effect on the current of the background harmonic voltage and the command signal is difficult to be suppressed. In order to improve the harmonic suppression capability of the output current, a new harmonic damping strategy for single grid-connected inverter was proposed on the basis of analyzing the conventional current tracking control strategy. The influence of the closed-loop parameters on system performance was analyzed and the design of control parameters was presented. Frequency domain analysis, simulation and experimental results show that the proposed control strategy can effectively suppress the effect from background harmonic voltage and the command signal,realizing the control target of high-quality output current.

关 键 词：并网逆变器 LCL滤波器 谐波阻尼 背景谐波 总谐波含量 

分 类 号：TM615[电气工程—电力系统及自动化]