摘要
当电网出现故障时,在孤岛检测时,常用的无源检测方法和有源检测方法中的有源频率偏移、滑模频率偏移和输出功率扰动法都存在检测盲区。针对这几种方法在孤岛检测时的缺陷,提出了一种主动式孤岛检测新方法,通过脉动负载改变逆变器并网负荷大小,检测逆变器输出电压、频率等来判断孤岛的发生。通过理论分析了该方法具有检测速度快,对电网无影响,无检测盲区。该方法对多台并网运行的光伏逆变器也同样适用。并通过仿真测试和实际产品试验验证了该方法的有效性。
When the grid fails, two methods are used for the islanding detection, one is the passive detection method and the other one is the active detection method which includes the active frequency drift, sliding mode frequency shift and output power disturbance method, but they all have non-detection zone. For the defects of these methods, this paper puts forward a new active islanding detection method. It identifies the islands through changing the size of the inverter output load with pulsating load, and detecting inverter output voltage and frequency. The theoretical analysis shows that this method is fast and has no effect on the grid, and there are not blind spots. This method also applies to multiple grid-connected PV inverters. Simulation results verify the validity of the method.
出处
《电力系统保护与控制》
EI
CSCD
北大核心
2013年第22期117-121,共5页
Power System Protection and Control
基金
河南省科技攻关(重点)项目(112102210339)
关键词
光伏逆变
并网
孤岛检测
无源
主动
PV grid inverters
grid-connedted
islanding detection
passive
active
