提高单相光伏并网系统低压穿越能力的电流解耦控制策略  

Current Decoupling Control Strategy for Improving the Low-voltage Ride Through Capability of Single-phase Photovoltaic Grid-connected System

作　　者：涂睿[1] 曹一家[1] 李勇[1] 丁立国[1] 李世军[1] TU Rui;CAO Yijia;LI Yong;DING Liguo;LI Shijun(College of Electrical and Information Engineering,Hunan University,Changsha 410082,China)

机构地区：[1]湖南大学电气与信息工程学院,长沙410082

出　　处：《电力系统及其自动化学报》2018年第6期66-72,共7页Proceedings of the CSU-EPSA

摘　　要：为避免单相光伏并网系统在电网电压跌落故障期间突然脱网造成的严重后果,提出了一种基于单相dq电流解耦的低压穿越控制策略。该策略参考国内外电网低压故障相关技术标准,根据实时检测电网电压的跌落深度大小,通过对并网电流dq解耦来分别控制调节并网的有功电流和无功电流参考,从而向电网注入一定的无功功率,帮助电网电压的恢复,由此达到低压穿越的目的。最后,通过系统仿真测试,验证了该方法的可行性和有效性。To avoid serious consequences caused by the off-grid of a single-phase photovoltaic grid-connected system during grid voltage sags,a low-voltage ride through（LVRT）control strategy is proposed based on single-phase dq current decoupling.With reference to the low-voltage fault related technical standards on power grid both at home andabroad as well as according to the real-time detected depths of grid voltage sags,the proposed strategy controls and regulates the active current and reactive current reference through the dq decoupling of grid current. In this way,the corre-sponding reactive power can be injected to the grid and help to recover the grid voltage,achieving the objective ofLVRT. Finally,the feasibility and effectiveness of the proposed method are verified by tests conducted on a system simulation model.

关 键 词：单相光伏 并网系统 逆变控制 无功补偿 低压穿越 

分 类 号：TM46[电气工程—电器]