适用于电网规划的风电场短路电流计算模型

摘要

在风电场短路电流特性及风电机组控制原理分析的基础上,探讨了一种风电场短路电流计算模型.首先分析不同类型的单台风电机组短路电流计算模型,并针对场内风电机组类型不同的情况,给出等值电抗的计算方法;然后针对集电系统的影响,推导出集电线路等值阻抗的求取方法;最后综合考虑场内机组类型不同和集电系统影响等因素,建立整个风电场的短路电流计算模型.仿真结果表明:与详细模型对比,采用所建立的模型时计算出的短路电流值偏大,在电气设备选型、导体的选择时有利于系统安全稳定运行,且所研究模型的误差能够满足风电场短路电流计算的工程应用精度要求.%On the basis of analyzing short-circuit current characteristic of the wind power field and control principles for wind power generators, this paper discusses a kind of calculation model for short-circuit current of the wind power field.It firstly analyzes the calculation model short-circuit current of different typed single wind power generator and provides computation method for equivalent reactance aiming at the situation of different types of wind power generators.Then in allusion to influence of the collector system, it deduces calculating method for equivalent reactance of integrated circuit.Finally, it comprehensively considers factors of different types of generators in the field and influence of the collector system and establishes the calculation method for short-circuit current of the whole wind power field.Simulation results indicate that compared with the detailed model, value of short-circuit current worked out by using this model is larger, which means more favorable in ensuring safe and stable operation of the system when selecting electrical equipment and conductors.Meanwhile, error of this model can meet precision requirement for engineering application of calculation on short-circuit current of the wind power field.