海上风电场故障特性及保护配合的研究

摘要

In general,the equipment and lines used in offshore wind farms are different from those of onshore wind farms.Therefore,it is necessary to study the configuration of relay protection for offshore wind farms.This paper analyzes the short circuit current and terminal voltage drop with the fault of the components in the wind power field and the outgoing line by the simulation software of ETAP,and studies the characteristics and fault characteristics of the offshore wind farm.When multiple wind farms are connected to the grid,the wind turbines will provide short-circuit current that cannot be ignored and it will be a bilateral power supply for the short-circuit point.Therefore,considering the characteristics and the low-voltage ride-through capability of the wind turbine,it proposes the protection scheme and the setting principle of the components and lines of the offshore wind farm.The cooperation of the protection program and action sequence of the offshore wind farm model built on the software ETAP is simulated,and the correctness and rationality of the proposed protection scheme and action sequence are verified.%一般海上风电场所选用设备和线路与陆上风电场有所不同,有必要对海上风电场的继电保护配置进行专门研究.利用ETAP仿真软件对风电场内元件及送出线故障时各元件的短路电流和机端电压跌落情况进行分析,并研究海上风电场本身特征和故障特性.在多个风电场并网时,风机会提供不容忽视的短路电流,短路点成为双侧电源供电.为此,考虑其特性及风机低电压穿越能力,提出海上风电场各元件和线路的保护配置方案及其整定原则.并对ETAP软件上搭建的某海上风电场模型进行保护及动作时序配合的仿真,验证了所提保护配置方案及动作时序的正确性和合理性.