带LCL输出滤波器的并网逆变器控制策略研究  

Control Strategy for Grid-connected Inverter With an LCL Output Filter

作　　者：王要强[1] 吴凤江[1] 孙力[1] 段建东[1] 

机构地区：[1]哈尔滨工业大学电气工程系,黑龙江省哈尔滨市150001

出　　处：《中国电机工程学报》2011年第12期34-39,共6页Proceedings of the CSEE

基　　金：国家自然科学基金项目(50477009)~~

摘　　要：并网逆变器用LCL输出滤波器是一个三阶多变量系统,给控制系统设计提出了更高的要求。针对该问题,提出一种基于逆变器侧电流闭环和电容电流前馈的并网逆变器控制策略,通过逆变器侧电流间接控制并网电流。该控制策略能够保证系统稳定和单位功率因数运行,并且整个控制过程无需增加额外的传感器,降低了系统成本,增强了系统可靠性。仿真和实验结果验证了提出控制策略的有效性与可行性。The grid-connected inverter with LCL output filter is a third-order and multi-variable system,claiming a higher demands to the control system design.Aiming at this,a grid-connected inverter control strategy based on inverter-side current closed-loop and capacitor current feed-forward was proposed,controling the grid-side current indirectly through the inverter-side current.With the proposed control strategy,system stability and unity power factor are ensured,at the same time,no additional sensors are needed,making equipment costs reduced and reliability enhanced.Effectiveness and feasibility of the proposed strategy are validated by both the simulation and experiment results.

关 键 词：并网逆变器 LCL滤波器 系统稳定性 功率因数 电流估计 

分 类 号：TM85[电气工程—高电压与绝缘技术]