光伏接入对电网的影响研究

Research on the influence of photovoltaic access on a power grid

为解决光伏系统接入导致电网的电压分布、网络损耗和短路电流发生改变等问题,需要对光伏系统的接入位置和接入容量进行合理规划。首先,基于WSCC3机9节点环形电网模型建立了仿真模型,并对仿真过程中部分参数进行了简化处理。其次,分别对单、多个光伏发电系统的接入位置、接入容量仿真分析,研究了光伏并网对电网电压的影响。随后,对光伏接入位置、接入容量对系统网损的影响进行了仿真分析。最后,研究了光伏接入对网络短路电流的影响。通过以上仿真分析研究,有助于指导光伏系统的接入位置及容量。

In order to solve the problem of voltage distribution,network loss and short-circuit current change caused by photovoltaic system access,the access location and capacity of a photovoltaic system need to be reasonably planned.First,a simulation model is established based on the 9-node ring network model of a WSCC3 machine,and some parameters in the simulation process are simplified.Secondly,the influence of photovoltaic grid-connection on grid voltage is studied through simulation analysis of access location and capacity of single and multiple photovoltaic power generation systems.Then,the influence of photovoltaic access position and access capacity on system network loss is simulated and analyzed.Finally,the influence of photovoltaic access on short-circuit current is studied.The above simulation analysis and research can guide photovoltaic system access location and capacity.