考虑N-1安全性的输电网络启发式扩展规划方法

A heuristic method for transmission network expansion planning considering N-1 security

在输电网规划中,数学优化方法尽管能得到数学上优化的解,但是不得不对各种约束进行简化构造出可计算的模型,特别是N-1检验条件无法直接列入模型,也不一定保证其最优解在实际工程中的实用价值。因此提出了一种考虑N-1安全性的输电网络启发式规划方法,该方法将启发式方法和N-1检验相结合,通过采用直流潮流模型对网络进行减线及加线分析,自动地变换网络拓扑结构,进行两步扩展后生成最终的规划网络。具有简单快速、直观的优点,最后通过一个算例进行验证,结果表明所提方法能够得到满足实际工程需要的电网规划方案。

In the transmission network planning, even though the mathematic method can get the optimal result, it needs to construct calculable model considering all constraints, especially the N-1 safety analysis can＇t be included in the model and the optimal result cannot always ensure the practicability in the practical engineering. So in this paper, a heuristic method of transmission network planning which takes into account N-1 safety analysis is presented. It combines heuristic method and N-1 safety analysis, adopts DC Power Flow model to add and delete line to transform network configuration automatically and creates the final network through two-step expansion planning. It is simple and rapid. A sample system is used to testify this method and the result shows it can give a planning scheme that can meet practical engineering needs.