计及电网拓扑优化的电压支撑决策模型

Voltage-support decision-making model considering power network topology optimization

电网电压支撑是源(发电与负荷)网协调合作的结果。电力系统中输配交融,电能双向流动,源网间呈现交织纠结的矛盾,导致仅依赖于源的调整的电压支撑方式出现非同调现象。在源平衡方式给定的前提下,将电网结构状态调整纳入决策量,建立考虑变压器过负荷闭锁调档限制的电压支撑决策模型,并由遗传算法和非线性原对偶内点法组合求解。算例分析证明了所提方法的有效性,显现应对未来电力系统多变情形下实施源网协同的必要性。

A power grid carrying structure model proposed, the indexes, such as transmission line based on complex network and intormation entropy is carrying capacity,carrying coefficient and whole-grid electrical structure carrying entropy, etc., are defined, and self-organized criticality of power grid is researched. The the qualitative relationship between it and the simulation of IEEE 118-bus system reveals that, the carrying structure can reflect the variation of grid structure and operating state, and there is macroscopic relevance between the carrying entropy variation and the load loss variation,based on which,a bi-level defense strategy against cascading failure is proposed to optimize the fault control and plan the grid development,and a cascading failure simulation model applying the defense strategy is built. A cascading failure simulation for a practical power grid verifies the rationality of the proposed indexes and the comparison of outage cumulative probabilistic distribution curve between with and without defense strategy verifies its effectiveness.