风电网电压波动特性影响因素的建模仿真

Modeling and Simulation for Influencing Factors of Voltage Fluctuation Characteristics Caused by Wind Power Grid

基于风电机组的特性,阐述了双馈感应电机的动态数学模型和并网模型,利用Matlab/Simulink软件搭建了含风电场的并网仿真模型。重点讨论了在风剪切和塔影效应共同作用的风速模型下,湍流强度、电网阻抗角以及系统短路容量对风电网电压波动特性的影响及可采取的改进措施。仿真结果表明,塔影效应、湍流强度、电网阻抗角和系统短路容量对产生电压波动影响较大。通过充分考虑区域环境和周边电网状况、选择合适的输电线路材料、合理确定并网点及电压等级,能在一定程度上抑制电压波动。

Based on the characteristics of wind turbines,the dynamic mathematical model and the gridconnected model of the doubly-fed induction generator were described,and a simulation model of grid-connected in which the wind farms are included was built by the software of Matlab / Simulink. What is more,in the wind speed model with the combined effect of wind shear and tower shadow,the influences of turbulence intensity,the grid impedance angle and system short-circuit capacity on voltage fluctuation characteristics,with some available improvements,were discussed emphatically. The simulation results show that there are relatively great impacts of the tower shadow effect,the turbulence intensity,the grid impedance angle and system short circuit capacity on the voltage fluctuation. Therefore,the voltage fluctuation can be suppressed to some extent by taking fully account of the regional environment and the surrounding grid conditions,selecting the appropriate materials of electric transmission line and reasonably choosing the voltage class and location where the wind farm is connected with power grid.