并网光伏电站电磁暂态建模及其特性研究

针对宁夏地区某光伏电站并网情况,利用实时数字仿真仪 RTDS 对光伏发电系统控制模型及电磁暂态特性进行了分析与研究,并结合宁夏电网进行了建模验证及仿真计算。结果表明:光伏电站受到逆变器容量限制,故障电流一般不超过最大额定电流的 1.1~1.3 倍,不对称故障下光伏电站的故障电流以正序量为主,含少量的负序和畸变。

Photovoltaic power station electromagnetic transient model and its features

Aiming at a case of solar power photovoltaic plant in Ningxia started generation andconnected to the grid,analyzes and researches the control model and the electromagnetic transientcharacteristics of photovoltaic power generation system using real-time digital simulation(RTDS) software,combining with Ningxia power grid,makes model verification and simulation calculation.The results show that the photovoltaic power plant is limited by the inverter capacity,fault currentis generally not more than 1.1 to 1.3 times of the maximum rated current,when the asymmetricfault,fault current has mainly in positive sequence amount,containing little negative sequence anddistortion.