基于无功电流注入的光伏逆变器低电压穿越策略  

Low voltage ride-through strategy of PV inverter based on reactive current injection

作　　者：许志荣[1,2,3] 杨苹[1,2,3] 郑群儒 周述前 何婷[1,2,3] 

机构地区：[1]华南理工大学电力学院,广东广州510640 [2]华南理工大学风电控制与并网技术国家地方联合工程实验室.广东广州511458 [3]华南理工大学广东省绿色能源技术重点实验室,广东广州511458

出　　处：《可再生能源》2015年第9期1317-1322,共6页Renewable Energy Resources

基　　金：国家高技术研究发展计划“863”计划(2014AA052001);南沙区科技计划项目资助(2013P005);南方电网科学研究院科技项目(SEPRI-K143003)

摘　　要：大量的光伏电站接入电网,为了提高电力系统的稳定性,需考虑光伏发电的低电压穿越能力。文章基于无功电流电压支撑方案,提出使用电流单环控制的低电压穿越策略,当电网电压因故障而降低时,逆变器由电压电流双环控制切换到电流单环控制,升压电路由最大功率控制(MPPT)切换到稳压控制。经仿真表明,所提出的电流单环控制策略能在电网发生故障时,有效的完成电压的稳定过渡,实现低电压穿越,具有实用价值。A large number of photovoltaic power plants have been installed and connected to the grid,which requires low voltage ride-through（LVRT） of PV to improve the stability of the power system.Based on reactive current support scheme, a LVRT method of single-loop control strategy is proposed in this paper, when the grid voltage dips by a fault, the inverter operation is switched from the voltage and current duel-loop control strategy to the current single-loop control, the booster circuit is switched from the power maximum control（MPPT）, to the regulator voltage control. The simulation results show that the single-loop current control strategy can effectively keep voltage stability, achieve LVRT, which is seemed to be applied.

关 键 词：光伏发电 低电压穿越 双环控制 单环控制 

分 类 号：TM615[电气工程—电力系统及自动化]