风速波动下双馈机组风电场动态等值

摘要

Due to the complexity of wind farm dynamic performance, it is difficult to meet the requirement of system dynamic security analysis by simulating on each generator. It is critical to establish a suitable dynamic equivalent model and evaluate the effect of the wind power generation on the reliable operation of power system correctly. This paper analyzes the dynamic performance of wind farm affected by generator control system when the wind speed changes, and proposes a dynamic grouping method for DFIG as well as a wind speed equivalent model for coherent group wind turbines. Then a multi-machine dynamic equivalent model for wind farm is proposed through an equivalent aggregation of coherent group wind turbines, generators, converter systems and collector systems. The proposed method is proved to be effective and feasible after a comparison of the equivalent effects in the situation of fault, wind variation and different working conditions.%由于风电场动态行为的复杂性,对每台风机进行仿真计算难以满足系统动态安全分析要求.如何建立合适的风电场动态等值模型,正确评价风力发电对电力系统可靠运行的影响,是非常重要而迫切的.分析了风速变化时风机控制系统作用下风电场动态特性,提出双馈风电机组的动态分群方法以及同群机组的风速等值模型.并对分群后双馈机组及其电气接线系统进行等值聚合,提出了多机表征的风电场动态等值模型.算例在不同工况、故障和风速变化下进行等值效果比较,验证了该方法的有效性和可行性.