摘要
根据单相光伏并网逆变器的特点,针对两级式拓扑结构,对传统的双环控制方式(电压外环、电流内环)进行了详细分析,在此基础上提出一种基于输入功率前馈环节的新型光伏并网逆变器控制算法。该算法将光伏板输出功率作为前馈量加入到电流内环,使电流环给定含有输入功率信息。通过分析,该算法能有效提高传统控制方式输出电流对输入功率发生变化时的响应速度,使系统的动态响应性能更加优越。通过Matlab/Simulink对所设计算法进行了仿真分析,并给出有/无功率前馈环节输出电流对输入功率变化响应的对比,结果显示了该算法的有效性。同时设计1 kW试验样机,试验结果表明样机的动态响应特性也有明显的提高,进而证明了理论分析的正确性。
The traditional double-loop control strategy is analyzed according to the characteristics of two-stage grid-connected single-phase PV inverter,based on which a control algorithm with power feedforward is proposed.The output power of PV panels is added to the reference of current close-loop as power feedforward,which improves the dynamic response to the input power changes.Simulations with Matlab / Simulink are carried out and the comparison of output current response to input power change between controls with and without power feedforward verifies its effectiveness.The experimental result of 1 kW PV inverter prototype proves the correctness of theoretical analysis.
出处
《电力自动化设备》
EI
CSCD
北大核心
2010年第6期16-19,30,共5页
Electric Power Automation Equipment
基金
哈尔滨市科技创新人才研究专项基金项目(2008RFXXG007)~~
关键词
并网逆变器
两级式拓扑
双环控制
功率前馈
电流环
动态响应
grid-connected PV inverter
two-stage topology
double-loop control strategy
power feedforward
current closed-loop
dynamic response
