电测与仪表
電測與儀錶
전측여의표
ELECTRICAL MEASUREMENT & INSTRUMENTATION
2014年
5期
51-55
,共5页
罗劲松%王金梅%张小娥
囉勁鬆%王金梅%張小娥
라경송%왕금매%장소아
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
光伏電站%低電壓穿越%dq鎖相環%電壓跌落檢測%二階廣義積分
광복전참%저전압천월%dq쇄상배%전압질락검측%이계엄의적분
photovoltaic power station%low voltage ride through( LVRT)%dq-phase locked loop( dq-PLL)%voltage sag detection%second order generalized integral( SOGI)
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。
快速準確檢測齣併網點電壓不同類型的跌落故障是光伏電站實現低電壓穿越的前提。針對電壓負序分量導緻基于dq鎖相環的常規檢測方法無法檢測電壓不對稱跌落的問題，採用二階廣義積分法對電壓進行相序分離，濾除負序分量讓正序分量進入鎖相環，實現對電壓不對稱跌落故障的檢測。基于Matlab/Simulink搭建瞭倣真平檯，倣真結果錶明上述方法對多種類型的電壓跌落故障有較高檢測精度，驗證瞭該方法的可行性。
쾌속준학검측출병망점전압불동류형적질락고장시광복전참실현저전압천월적전제。침대전압부서분량도치기우dq쇄상배적상규검측방법무법검측전압불대칭질락적문제，채용이계엄의적분법대전압진행상서분리，려제부서분량양정서분량진입쇄상배，실현대전압불대칭질락고장적검측。기우Matlab/Simulink탑건료방진평태，방진결과표명상술방법대다충류형적전압질락고장유교고검측정도，험증료해방법적가행성。
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.
