基于确定型评价指标的电力系统调度灵活性研究

高比例可再生能源由于其不确定性等特点给电力系统的稳定运行带来了巨大挑战,因此更加快速稳定的电力系统调节能力需要多种灵活性资源的共同参与。为此,基于调度层面提出一种系统整体灵活性指标(Overall System Flexibility, OSF)。首先分析系统净负荷、机组、储能和联络线的灵活性特点并建立灵活性模型。提出一种基于能力要素的确定型指标,该指标能够将各部分资源作为一个整体来描述系统的灵活性。然后建立了考虑区域互联的电力系统调度模型并对指标进行计算。算例基于三区域IEEE RTS96系统,选取其中10个机组数据,从储能、联络线、备用容量等方面进行验证。计算出系统灵活性指标并对比分析,结果表明所提指标可以直观地反映系统的整体灵活性。

Research on dispatching flexibility of power system based on deterministic evaluation index

Due to its uncertainty and other characteristics, the high proportion of renewable energy has brought great challenges to the stable operation of power system. A more rapid and stable power system regulation capability requires the participation of multiple flexible resources. For this purpose, an Overall System Flexibility (OSF) index based on scheduling level is proposed. Firstly, the flexibility characteristics of net load, unit, energy storage and tie line of the system are analyzed and their flexibility model is established. Then, a deterministic index based on capability factor is proposed, which can describe the flexibility of the system as a whole. And the dispatching model of power system considering regional union is established and the indexes are calculated. Based on the three-area IEEE RTS96 system, 10 units of the system are selected. The OSF index is calculated and compared from the aspects of energy storage, tie line and reserve capacity. The results show that the proposed index can directly reflect the flexibility of the whole system. This work is supported by National Natural Science Foundation of China (No. 51877154).