基于虚拟阻抗的逆变器死区补偿及谐波电流抑制分析  

Dead-Time Effect and Background Grid-Voltage Harmonic Suppression Methods for Inverters with Virtual Impedance Control

作　　者：陈杰[1] 章新颖 闫震宇 韦徵[2] 陈新[1] Chen Jie;Zhang Xinying;Yan Zhenyu;Wei Zheng;Chen Xin(Jiangsu Key Laboratory of New Energy Generation and Power Conversion,Nanjing University of Aeronautics&Astronautics,Nanjing 211106,China;NARI Group Corporation/State Grid Electric Power Research Institute,Nanjing 211106,China)

机构地区：[1]南京航空航天大学江苏省新能源发电与电能变换重点实验室,南京211106 [2]国电南瑞科技股份有限公司,南京211106

出　　处：《电工技术学报》2021年第8期1671-1680,共10页Transactions of China Electrotechnical Society

基　　金：国家自然科学基金面上项目(51777095);南瑞集团科技项目“大规模新能源发电建模、硬件在环平台构建及源网协同控制技术”资助。

摘　　要：并网逆变器作为可再生能源发电系统与大电网之间的关键接口,在控制模式及电能质量方面有着较高的要求。间接电流控制逆变器既有较快的电流响应,也可实现并/离网模式的平滑转换。该文以并网逆变器为研究对象,对开关体器件死区效应产生的谐波电流以及电网电压背景谐波造成的并网电流畸变问题进行分析。进而提出虚拟并联陷波阻抗、串联谐振阻抗的改进控制策略,有效抑制了因上述两个问题引起的谐波电流,显著改善了并网电流质量。仿真及实验验证了所提方法的有效性。Grid-connected inverters,as the interface between distributed energy and large power grids,have high requirements in terms of control structure and power quality.Inverters with indirectcurrent-control has fast power response and can realize the smooth transfer between grid-connected and stand-alone modes.In this paper,the grid-connected current distortion caused by the dead-time effect of the semiconductor devices and the grid-voltage background harmonics are analyzed.Furthermore,specific solutions by adding virtual parallel and series impedance are given to improve the power quality.Simulation and experiments verify the effectiveness of the proposed method.

关 键 词：间接电流控制逆变器 死区补偿 电压背景谐波 虚拟阻抗 

分 类 号：TM315[电气工程—电机]