LCL型并网变换器PCC点电压反馈有源阻尼控制策略  

PCC Voltage Feedback Active Damping Control Strategy for Grid-connected Converter with LCL Filter

作　　者：王颖杰[1] 王文超[1] 李炎[1] 许贺[1] WANG Yingjie;WANG Wenchao;LI Yan;XU He(School of Information and Electrical Engineering,China University of Mining and Technology,Xuzhou 221008,Jiangsu,China)

机构地区：[1]中国矿业大学信息与电气工程学院,江苏徐州221008

出　　处：《电气传动》2017年第2期29-34,共6页Electric Drive

基　　金：中国博士后科学基金项目(2014M561726);国家重点研发计划(2016YFC0600906)

摘　　要：并网变换器作为分布式发电系统与电网间的连接枢纽,并网电流质量是其关键,采用LCL滤波器可用较小的电感量有效地降低电流谐波,但易引起谐振。同时,随着分布式发电系统的增大,公共接入点(PCC)的电网阻抗使得LCL滤波器固有谐振频率发生移动,更不利于电流系统的控制。而已有的大部分研究并没有重视电网阻抗的影响。针对上述问题,提出了一种基于公共接入点电压反馈的有源阻尼控制策略,该策略不需额外地增加传感器。分析了反馈环节参数对所提策略阻尼效果的影响。仿真验证了该策略的有效性与可行性。Grid-connected converter is the connecting hub between the distributed generation system and thegrid,and the quality of grid connected current is the key.Although the use of LCL filters can effectively reduce thecurrent harmonics with smaller inductance,it is easy to cause resonance.Meanwhile,with the increase of thedistributed generation system,the grid impedances of the public connecting point(PCC)make the LCL filter′sinherent resonant frequency shift,which is not conducive to the control for the current system.However,most of thestudies have not paid much attention to the influence of the grid impedance.In view of the above problems,presentedan active damping control strategy without extra sensors,which was based on public connecting point voltagefeedback.The effect of the feedback link parameters on the damping effect was analyzed.The validity and feasibilityof the proposed control strategy are verified by simulation.

关 键 词：并网变换器 电网阻抗 公共接入点电压 LCL滤波器 有源阻尼 

分 类 号：TM46[电气工程—电器]