大容量风电场接入电网的暂态稳定特性和调度对策研究

Studies on the Transient Behavior and Dispatching Strategy of Power System Integrated With Large Scale Wind Farms

给出了异步风力发电机组的动态仿真数学模型和含风电场的电力系统暂态稳定分析方法,与国内大型电力系统分析软件相联接,实现了含风电场的电网动态稳定分析及其工程应用。结合风电场接入系统实例,分析了大容量风电场接入系统后电网的暂态稳定特性,提出了保证风电场和电网安全稳定运行的风电场安全容量的概念。探讨了通过控制负荷侧功率因数、采取动态无功补偿装置、加强网架结构、故障后切除风电机组等措施改善电网暂态稳定水平、提高风电场安全容量的办法。通过计算风电场不同开启容量下最大可调出力及对应风速的关系,提出了风电场接入系统后的电网调度对策,采取该调度策略,可以提高风电场的接入系统容量。

The dynamic model of induction wind generators and the dynamic stability analysis method of power system with wind farms were presented, the engineering application was realized through the integration of the model and the method with the power system analysis software widely used in China. Combining a typical example, the transient behavior of the power system integrated with a large scale wind farm was analyzed and a concept of Security Capacity of the Wind Farm is given forward considering the condition to guarantee the security and stability of both the power system and the wind farm. Some strategies, for example, the control of power factor of the load, the application of dynamic reactive power compensator, strengthening of the grid and tripping of the wind turbines after the fault were studied to improve the transient behavior and enhance the Security Capacity of the Wind Farm. A dispatching strategy was brought forward by calculating the relationship among operable capacity, dispatchable power and wind velocity. The penetration of wind power can be increased through the application of this dispatching strategy.