以简单系统和某实际电网为研究对象，分析风电、光伏接入对接入点短路电流的影响。计算结果显示，风电机组提供的短路电流衰减速度高于同步机组。其中：普通异步风机提供的短路电流较大，在50 ms时一般可衰减近50%；双馈异步风机故障瞬间提供的短路电流较异步风机大，但衰减速度非常快，50 ms时一般可衰减近97%左右；直驱永磁同步风机的短路电流最小，衰减最快，50 ms时基本不提供短路电流。受光伏电站中逆变器等电力电子装置的过载能力限制，光伏电站向系统提供的短路电流很小，光伏电站经多级升压后接入高压送电网中的短路电流基本可忽略不计。

Base on a simple power grid and a real power grid in northwest of China, this paper analyzes the influence of wind power and photovoltaic access on the short-circuit current of the access point. The calculation results show that, the attenuation rate of the short circuit current of wind generator is high than that of synchronous generator, in which the short circuit current of asynchronous induction generator is larger and can be attenuated by nearly 50% at 50 ms. The short current of doubly fed induction generator is larger than that of the asynchronous generator at the instant of short circuit, but the attenuation rate is very fast, and it can be attenuated nearly 97% at 50 ms. The direct drive permanent magnet synchronous generator has the smallest short-circuit current and the fastest attenuation rate, and does not provide short circuit current at 50 ms. Due to the overload capacity of inverters and other power electronic devices in photovoltaic power plants, the short circuit current supplied by photovoltaic power plants is very small, and the short-circuit current of photovoltaic power plants can be ignored when they are connected to the high voltage transmission grid by multi-stage boost.