小功率光伏并网逆变器控制策略的研究  

Study on control scheme based on low-power photovoltaic grid-connected inverter

作　　者：易映萍[1] 罗海[1] 胡四全 

机构地区：[1]上海理工大学,上海200093 [2]许继柔性输电系统公司,河南许昌461000

出　　处：《电力系统保护与控制》2016年第4期64-68,共5页Power System Protection and Control

基　　金：国家高技术研究发展计划(863计划)资助项目(2012AA050206)~~

摘　　要：为减少开关频率引起的电流谐波和实现电气隔离,采用带T型滤波器和工频隔离变压器的并网逆变器拓扑。针对传统电流SPWM控制响应速度慢和单纯采用电流PI控制不能消除电网扰动对并网电流影响的缺点,提出了电流PI和电网电压前馈相结合的SPWM电流瞬时值跟踪控制。通过对光伏并网逆变器控制原理的理论分析,设计了并网逆变器控制模型,并推导出各个控制环节的传递函数模型,最后进行了电流环PI调节器的设计。通过对Matlab仿真结果分析,表明该种控制策略是可行的。In order to reduce line-side current harmonic caused by switching frequency and achieve electrical isolation, a grid-connected inverter with a T filter and an isolation transformer is used. To make up for the shortcomings of independent PI control of current and low response rate of traditional current-SPWM control, the method of current- SPWM control of tracking current momentary value with PI control of current and voltage feed-forward is presented. With the analysis of control principle of grid-connected inverter, control model of the grid-connected inverter is designed, transfer functions of every control link are derived and PI parameters are designed. At last, the Matlab simulation results show that the control strategy is feasible.

关 键 词：T型滤波器 工频隔离变压器 电流PI 电压前馈 SPWM电流瞬时值跟踪控制 Matlab 

分 类 号：TM464[电气工程—电器] TM615