逆变器侧电流反馈的LCL并网逆变器电网电压前馈控制策略  

A Full Grid Voltage Feed-forward Control Strategy With Inverter-side Current Feedback for LCL Grid-connected Inverters

作　　者：吴云亚[1] 谢少军[2] 阚加荣[1] 过亮[3] 

机构地区：[1]盐城工学院实验教学部,江苏省盐城市224051 [2]南京航空航天大学自动化学院,江苏省南京市210016 [3]国电南瑞科技股份有限公司,江苏省南京市210003

出　　处：《中国电机工程学报》2013年第6期54-60,9,共7页Proceedings of the CSEE

基　　金：国家自然科学基金项目(51107108;51077070)~~

摘　　要：逆变器侧电流反馈的具有稳定性强、单闭环控制、参数设计简单和系统成本较低的优点,但是其属于电网电流间接控制,造成并网功率因数较低,此外,电网电流中还包含由电网电压引起的低次谐波电流。为保留其优点并克服其缺点,提出一种适用于逆变器侧电流反馈LCL并网逆变器的完全电网电压前馈控制策略,该策略能完全消除电网电压对电网电流的影响,并且并网功率因数得到了大大的提升。仿真与实验结果表明,所提控制策略正确、有效。The LCL grid-connected inverter, which uses the inverter-side current as feedback parameter, has many advantages, such as stronger stability, single-current loop, easy design for control parameters and its low cost. However, the grid current is controlled indirectly, which causes the power factor at grid-side is less than 1. Moreover, the grid current contains a lot of low-order harmonic, which results from low-order harmonic in grid voltage. A full grid-voltage feed-forward was proposed to overcome its shortcomings and reserve its merits, which can cancels out the effect of grid voltage on grid current and＇ the power factor at grid-side is approximately equal to 1. The simulation and experimental results verify that the performance of proposed control strategy is excellent.

关 键 词：并网逆变器 LCL滤波器 逆变器侧电流反馈 电网电流 低次谐波电流 电网电压前馈 

分 类 号：TM7[电气工程—电力系统及自动化]