TCSC提高大容量风电接入系统的稳定性及控制策略

摘要

Transient stability of the power system is changed with large-scale wind power integration of the system. The network transient energy function of the system with wind farms is derived, and the distribution of transient energy over the network of the power system, which is integrated with large scale wind turbines utilizing doubly fed induction generators(DFIG), is analyzed. Based on the feature that the majority of the transient energy of the system integrated with DFIG accumulates in the local section of the network, the impact of thyristor controlled series compensation(TCSC) on power system transient stability is studied. The network transient energy function is used to determine the control strategy of TCSC in transient stability process, which is only based on branch dynamic variables. As an example, the New England 10-generator 39-bus system and one machine infinite bus system are simulated. Simulation results demonstrate that the method can improve power system transient stability and voltage recovery of the wind farm.%大容量风电的接入使得系统的稳定性发生变化。本文推导出了含有大容量风电的网络暂态能量函数的表达式，分析了大容量基于双馈感应电机（DFIG）的风电机组接入系统后暂态能量在网络中的分布特性。根据大容量基于DFIG的风电机组接入系统，暂态能量的分布同样具有聚积性的特点，分析了可控串联补偿装置对系统暂态稳定性的影响，并以网络能量函数为依据提出了仅依赖于支路信息的控制策略。以单机无穷大系统和New England 10机39节点系统为算例进行了仿真计算，结果表明了所提控制策略可以有效提高系统暂态稳定性，并能改善风电场在电网发生故障后电压的恢复。