CAJ | 학술논문

充分利用主动电压相位突变检测与被动电流扰动的互补特性,提出基于相关因子的复合孤岛检测方法,克服单一相位突变检测方法的被动检测方法在近乎阻性负载下失效的问题,加快检测速度,并尽可能减少对电能质量的影响.利用当孤岛发生时逆变器输出电压和电流扰动的相互关系产生相关因子,通过阈值判断孤岛是否发生.在MATLAB 仿真平台上搭建光伏并网系统仿真模型,选择代表性负载,模拟实际过程,进行相应分析,较好地验证了这一方案的可行性和有效性.此外,复合检测方法还能区分孤岛现象与电网电压不稳定或大负载的突然投入/切除引起电网的异常偏离.
충분이용주동전압상위돌변검측여피동전류우동적호보특성,제출기우상관인자적복합고도검측방법,극복단일상위돌변검측방법적피동검측방법재근호조성부재하실효적문제,가쾌검측속도,병진가능감소대전능질량적영향.이용당고도발생시역변기수출전압화전류우동적상호관계산생상관인자,통과역치판단고도시부발생.재MATLAB 방진평태상탑건광복병망계통방진모형,선택대표성부재,모의실제과정,진행상응분석,교호지험증료저일방안적가행성화유효성.차외,복합검측방법환능구분고도현상여전망전압불은정혹대부재적돌연투입/절제인기전망적이상편리.
To make the best of complementary,both voltage phase jump detection method and passive current disturbance detection method for PV grid power system island detection arepropsed.It can overcome the disadvantages that the phasc jump detection method failure to work under resistive load,achieve fast and effective island detection,reduce the influenince to energy quantity.There is a correlator between the inverter output voltage and the current disturbance,when the correlator is higher than the threshold,island occurs.The model of PV grid power system is built under MATLAB,typical load is chosen for simulation and analysis.Experiment results verify that the complementary method is effective,it can distinguish island form grid voltage instability or voltage deviation.