基于SRSM和Nataf方法的含风电场群电力系统暂态稳定分析

Transient Stability Analysis of Power System Integrated With Wind Farm Groups Based on SRSM and Nataf Method

为对风电场群接入电力系统进行暂态稳定分析,将随机响应面法(stochastic response surface method,SRSM)应用于计算系统的暂态稳定性。该方法将复杂非线性的电力系统视为黑箱,采用Nataf方法对风电场群建模,建立暂态稳定随机响应与相关性的风速输入之间的多项式关系,只需较少的仿真次数即可快速估计系统响应的概率统计信息,解决了如蒙特卡罗的传统随机性分析方法计算次数多、仿真时间长、占用内存大的问题。IEEE 10机39节点算例验证了Nataf与SRSM相结合的算法的有效性及可适用性。IEEE 50机145节点算例表明,具有相关性的风电场群风速对系统暂态输出有一定影响,因而影响系统的安全稳定运行。

To analyze the transient stability of power system integrated with wind farm groups, this paper applied stochastic response surface method （SRSM） to compute system＇s transient stability. This method regards power system as a black box and builds wind farm group models by Nataf technology. It established polynomial relationship between transient stochastic response and correlative wind speed. Compared with the traditional approaches, such as Monte Carlo, SRSM can solve problems that they are facing, like more number of calculation times, long simulation time and need of large memory space. The case study on the IEEE 10-machine and 39-bus system showed the effectiveness and applicability of the method which combined Nataf and SRSM. Simulation results on IEEE 50-machine and 145-bus system show that wind farm groups＇ correlative wind speed has certain effect on system＇s transient stability and thus influences the safe and stable operation of power systems.