基于RTDS的分布式光伏并网建模研究

Research on Distributed Photovoltaic Grid Connection Modeling Based on RTDS

随着分布式光伏大规模发展,需要加强分布式光伏并网的建模研究。首先,基于RTDS实时仿真平台建立光伏列阵、并网逆变器、滤波器和隔离变压器等光伏并网模型。其次,在电网三相对称时,采用双环控制结构搭建光伏控制系统模型。然后,考虑电网不对称故障,建立基于双同步旋转坐标系的光伏负序控制模型。最后,通过仿真证明了所建模型在电网发生故障时光伏具有良好性能,验证了光伏负序控制可以有效降低负序电流,减小电流畸变。

With the large-scale development of distributed photovoltaic,it is necessary to strengthen the modeling research of distributed photovoltaic grid connection.Firstly,based on RTDS real-time simulation platform,photovoltaic grid connected models such as photovoltaic array,grid connected inverter,filter and isolation transformer are established.Secondly,when the power grid is three-phase symmetrical,the double loop control structure is used to build the photovoltaic control system model.Then,considering the asymmetric fault of power grid,a photovoltaic negative sequence control model based on double synchronous rotating coordinate system is established.Finally,the simulation results show that the proposed model also has good performance in case of power grid failure,and it is verified that photovoltaic negative sequence control can effectively reduce negative sequence current and current distortion.