风电机组并网对电网静态电压稳定性分析

Analysis of Static Voltage Stability of Power Grids Connected to Wind Turbines

近年来,随着风电技术的飞速发展,大规模的风电并网得到了广泛应用,相应的风电并网时的要求也越来越严格,风电机组在并网过程中对静态电压稳定和风电机组正常运行都产生了很大影响。本文在MATALAB/Simulink仿真软件中搭建了系统仿真模型,研究并分析了风电机组在接入电网后对电网静态电压稳定性的影响。为了探究风电机组并网后静态电压稳定的条件,本文根据风机的运行原理及模型,得到了一种判断风电机组静态电压平衡的判据,即潮流雅可比矩阵法,根据潮流雅可比矩阵值的大小来判断并网后静态电压的稳定。最后在经过PSO算法进行改进后,通过判断其特征值中是否有小于零的值来判断系统静态电压的稳定性,经验证可知,该方法能够判断出系统静态电压的稳定性。

In recent years,with the rapid development of wind power technology,large-scale wind power grid-connected has been widely used,and the corresponding requirements for wind power integration are becoming more and more strict.Wind turbines are stable to static voltage during grid-connected process.The normal operation of the wind turbine has a great impact.In this paper,the system simulation model is built in the simulation software of MATALAB/Simulink,and the influence of wind turbine on the static voltage stability of the grid after it is connected to the grid is studied and analyzed.In order to investigate the conditions of static voltage stability after wind turbines are connected to the grid,this paper obtains a criterion for judging the static voltage balance of wind turbines according to the operating principle and model of the wind turbine,namely the trend Jacobian matrix method,according to the trend Jacobian matrix value.The size is used to determine the stability of the static voltage after grid connection.Finally,after the improvement of the PSO algorithm,the stability of the static voltage of the system is judged by judging whether there is a value less than zero in the eigenvalue.It is proved that the method can judge the stability of the static voltage of the system.