含风电的电力系统动态频率响应快速评估方法

大规模随机波动的风电功率接入电网引起系统频率偏差,从而影响系统安全稳定运行。为了研究不同频率风电功率波动对系统频率偏差的影响,提出了考虑发电机特性、调速器特性、系统网络结构、负荷特性,含风电的电力系统频率响应频域分析模型。基于该模型推导了风电功率激励下的电力系统各节点频率响应传递函数的显式表达式。根据传递函数的幅频特性能准确反映不同频率风电功率波动激励下各节点的频率响应特性。将该模型应用于IEEE 10机39节点系统,结合实测风电场功率波动数据进行了算例仿真,结果表明利用该模型能快速准确评估风电功率对系统各节点频率响应的影响。

A Fast Assessment Method for Power System Dynamic Frequency Response to Wind Power Fluctuation

The frequency deviation caused by wind power fluctuations endangers the safe and stable operation of power system. A frequency domain model including governors, networks and load characteristics is developed to analyze the power system frequency response to the wind power fluctuations of different frequencies. Based on the proposed model, an explicit expression of the transfer function is obtained for evaluation of multiple wind power inputs and multiple node frequency outputs. The magnitude-frequency characteristic of the transfer function can accurately reflect the frequency response of different nodes to the wind power fluctuations. The proposed model is evaluated on the IEEE 10-unit 39-bus system, and combined with the measured data of wind power fluctuations, a simulation example is analyzed. The result validates that the model can evaluate the influence of wind power fluctuations on the system frequency response at all nodes efficiently and accurately. This work is supported by National Basic Research Program of China (973 Program) (No. 2012CB215201) and National Natural Science Foundation of China (No. 51477122).