电测与仪表Issue(5)：51-55,5.
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
Research on Improved Grid-Connected Point Voltage Sag Detection Method of Photovoltaic Power Station Based on dq-PLL
摘要
Abstract
Fast and accurately detecting different types of grid-connected point voltage sag faults is the precondition to achieve low voltage ride through of photovoltaic power station. For the conventional voltage 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.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Key words
photovoltaic power station/low voltage ride through( LVRT)/dq-phase locked loop( dq-PLL)/voltage sag detection/second order generalized integral( SOGI)分类
信息技术与安全科学引用本文复制引用
罗劲松,王金梅,张小娥..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[J].电测与仪表,2014,(5):51-55,5.基金项目
国家自然科学基金资助项目(51167015) （51167015）
科技部国际合作项目(2011DFA11780)宁夏回族自治区自然科学基金资助项目(NZ1152) （2011DFA11780）
