基于光伏并网逆变器的被动式反孤岛策略

Passive anti-islanding strategy based on photovoltaic grid-connected inverter

相对于离网光伏发电系统,并网光伏发电系统在运行时具有较高的电能利用效率,这就要求工作时候满足并网条件。对于光伏并网发电系统来说,必须要考虑一种故障——孤岛效应。孤岛效应可以使电压以及频率失去控制、产生很大的冲击电流、损害电网设备以及对人员造成电击的危险。因此下文主要介绍基于光伏并网逆变器的被动式反孤岛策略,从而最大程度上减小孤岛效应。

Compared with off-grid photovoltaic power generation system, grid-connected photovoltaic power generation system has high energy utilization efficiency in operation, which requires working conditions to meet the grid. For photovoltaic grid-connected power generation system, we must consider a fault-islanding effect. Islanding can cause voltage and frequency losses, create large inrush currents, damage grid equipment, and the risk of electric shock to personnel. Therefore, the following mainly introduces the passive anti-islanding strategy based on PV grid-connected inverters to minimize the islanding effect.