小功率光伏并网逆变器控制策略的研究

易映萍; 罗海; 胡四全

引用本文:	易映萍,罗海,胡四全.小功率光伏并网逆变器控制策略的研究[J].电力系统保护与控制,2016,44(4):64-68.
	YI Yingping,LUO Hai,HU Siquan.Study on control scheme based on low-power photovoltaic grid-connected inverter[J].Power System Protection and Control,2016,44(4):64-68

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小功率光伏并网逆变器控制策略的研究
易映萍¹, 罗海¹, 胡四全²
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

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。

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

DOI：10.7667/PSPC150731

分类号:

基金项目:国家高技术研究发展计划(863计划)资助项目(2012AA050206)

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

YI Yingping¹, LUO Hai¹, HU Siquan²

1.University of Shanghai for Science and Technology, Shanghai 200093, China;2.Xuji Flexible Transmission System Corporation, Xuchang 461000, China

Abstract:

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.

Key words: T filter isolation transformer PI control of current voltage feed-forward current-SPWM control Matlab

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