计及故障持续时间的电力系统暂态稳定分布式控制

Transient stable distributed control of power system grid considering fault duration

中文关键词  故障持续时间  暂态稳定控制  固定时间  电力系统通信拓扑建模  分布式控制器  储能装置

英文关键词  duration of failure  transient stability control  fixed time  power system communication topology modeling  distributed controller  energy storage device

中文摘要

      针对电力系统故障持续时间会影响暂态稳定控制的问题, 本文提出了一种使系统在固定时间内恢复暂态稳定运行的策略. 该策略通过电力系统通信拓扑建模方法为每个发电机建立“邻居发电机”, 利用发电机本地信息和其邻居发电机的信息设计分布式控制器, 通过控制储能装置作用于受扰动后的系统, 使其在固定时间内恢复稳定运行. 其次, 此控制策略还解决了一些实际挑战, 如控制器的输入延时、外部的干扰、储能装置的容量限制等. 通过构建李雅普诺夫函数并利用图论知识对该策略展开了稳定性分析, 推导出了稳定系统的时间界限. 最后, 将控制器投入新英格兰39节点测试系统中, 并与其它控制器进行比较, 仿真结果验证了在低容量储能装置限制下和抗干扰性上控制器性能的优势.

英文摘要

      A strategy for restoring power system transient stability in a fixed time is proposed to address the issue that the duration of power system fault affects transient stability control. This strategy creates a“neighbor generator”for each generator by the power system communication topological modeling method, and uses the local information of the generator and that of its neighbor generator to design a distributed controller that acts on the disturbed system through controlling the energy storage device to restore its stable operation in a fixed time. Secondly, this control strategy tackles various practical challenges, such as the input delay of the controller, external interference, and the capacity constraint of the energy storage device. By constructing a Lyapunov function and using graph theory, a stability analysis of the strategy is developed, and then the time-bound of the stable system is derived. Finally, the controller is compared to other controllers using the New England 39-bus test system. The simulation results demonstrate the performance advantages of the controller under the restriction of low capacity energy storage device and the property of anti-interference.