电力系统多时间尺度灵活性指标研究

Multi-Time Scale Flexible Indices of Power System

为了更好地解决间歇性电源接入电网的问题,应对风电的不确定性,考虑负荷的变化,提出了电力系统多时间尺度的灵活性评价模型。首先对风电的不确定性进行了介绍,阐述了灵活性的概念和特点,从应对电网中风电场出力变化能力的角度,针对负荷的变化,列举了3类不同的时间尺度,提出了基于不同时间尺度下系统响应电网中风电场出力变化最大速率的灵活性评价模型;对具体的灵活性评价数学模型进行阐述,并利用内点法实现了模型的求解。最后,以甘肃电网为例,对文中提出的灵活性指标进行了具体的算例说明。

To solve the problem of intermittent power connected to grid, this paper proposes the flexibility evaluation model of multi-time scale power system with considering wind power uncertainty and load fluctuation. This paper firstly introduces the wind power uncertainty, and describes the concept and characteristic of flexibility. From the view of the output change capacity of the wind farm in power grid, according to the change of load, we enumerate three kinds of time scales, and propose the flexibility evaluation model for the system response to the maximum change rate of wind farm output in power grid based on different time scales. Then, we explain the mathematical model of specific flexibility evaluation, and use interior point method to solve the model. Finally, taking Gansu power system as an example, the proposed flexibility indices is illustrated by a specific example.