分布式光伏发电并网的继电保护影响分析

Analysis of Relay Protection Impact for Grid-connected Distributed Photovoltaic Generation

随着光伏发电的大规模发展,越来越多的光伏项目通过分布接入、自发自用、余电上网的模式并入电网,因此光伏发电并网技术成为了工程中重要的研究方向。以分布式光伏发电系统并网为基础,从工程实际出发,分别从潮流的双向流动、电压和频率分析了分布式光伏发电系统对并网点继电保护的影响,也分析了对对侧变电站继电保护的影响,最后提出了校核定值、限制接入容量、增加保护设备、完善控制策略和完善前期回路等应对措施。

With the large-scale development of photovoltaic power generation,more and more photovoltaic projects are merged into the power grid through the mode of distribution access,self-use and residual power supply.Therefore,photovoltaic power generation grid-connected technology has become an important research direction in the project.Based on the grid connection of the distributed photovoltaic power generation system,starting from the actual engineering,the influence of the distributed photovoltaic power generation system on the relay protection of the parallel point is analyzed from the two-way flow,voltage and frequency of the power flow,and the influence on the relay protection of the opposite substation is also analyzed.Finally,some countermeasures are put forward,such as checking the rated value,limiting the access capacity,increasing the protection equipment,perfecting the control strategy and perfecting the early loop.