摘要
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.
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 are proposed.It can overcome the disadvantages that the phase jump detection method failure to work under resistive load,achieve fast and effective island detection,reduce the influence 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.
出处
《湘潭大学自然科学学报》
CAS
CSCD
北大核心
2011年第4期100-104,共5页
Natural Science Journal of Xiangtan University
基金
湖南省科技厅基金项目(11JJ8004,2010FJ3116)
湖南省教育厅基金项目(10A114)
