基于dq锁相环的改进型光伏电站并网点电压跌落检测方法研究.pdfVIP

学兔兔 第5l卷 第5期 电测与仪表 Vo1．51 NO．5 2014年 3月10日 Electrical MeasurementInstrumentation Mar．10，2014 基于dq锁相环的改进型光伏电站并网点 电压跌落检测方法研究水 罗劲松，王金梅，张小娥 (宁夏大学物理电气信息学院，银川750021) 摘要：快速准确检测出并网点电压不同类型的跌落故障是光伏电站实现低电压穿越的前提。针对电压负序分 量导致基于dq锁相环的常规检测方法无法检测电压不对称跌落的问题，采用二阶广义积分法对电压进行相序 分离，滤除负序分量让正序分量进入锁相环，实现对电压不对称跌落故障的检测。基于Matlab／Simulink搭建 了仿真平台，仿真结果表明上述方法对多种类型的电压跌落故障有较高检测精度，验证了该方法的可行性。 关键词：光伏电站；低电压穿越；dq锁相环；电压跌落检测；二阶广义积分 中图分类号：TM615 文献标识码：A 文章编号：1001—1390(2014)05—0051—05 Research on Improved Grid-Connected Point Voltage Sag Detection Method of Photovoltaic Power Station Based on dq——PLL LUO Jin-song，WANG Jin—mei，ZHANG Xiao—e (School of Physical and Electrical Information，Ningxia University，Yinchuan 75002 1，China) Abstract：Fast and accurately detecting different types of grid—connected point voltage sag faults is the precondition to achieve low voltage ride through of photovohaic power station．For the conventional vohage sag detection methods based on dq—PLL can not detect voltage unsymmetrical sag faults because of the negative sequence components of voltage．A sequence separation method based on second—order generalized integral is adopted to separate the sequences of voltage，filtering the negative sequence components and entering the positive sequence components into enter the PLL．In this way，the detection of voltage·unsymmetrical sag faults can be realized．The simulation results based on MATLAB／Simulink verified the above method has higher detection accuracy for several types of voltage sag faults，and the feasibility of the method is proved． Key words：photovohaic power station，low voltage ride t