电网自适应解列方案中孤岛静态工作点校验方法

摘要

解列控制是电力系统第三道防线的重要手段.本文遵循自适应解列中的"搜索+检验"决策思路,针对待检验孤岛灵活多变,孤岛运行工况变化大,潮流计算初值难以给定的困难,基于LM算法设计了一种解列后孤岛静态工作点验证新方法,提高了验证方法的快速性和准确性.本文从满足同步约束和功率平衡约束的已知解列断面出发,首先探究如何快速地形成孤岛潮流模型,然后引入自适应LM算法进行孤岛潮流计算,判断解列后的孤岛是否存在静态工作点;并针对不存在静态工作点的孤岛,提出了相应的孤岛潮流调整辅助信息.最后,采用实际算例介绍了本文方法的基本过程,验证了方法的可行性.%Islanding control is an important means in the third defensive line of power systems. This paper follows the"search+test"idea in the adaptive islanding control,and proposes a new method to verify the existence of the steady-state operating point of the candidate islands in the test phase based on the Levenberg-Marquardt(LM)al-gorithm. We discuss how to form an islanding power flow model quickly from the already-known splitting interface first,which satisfies the synchronization constraint and power balance constraint. Then,we introduce the adaptive LM algorithm to calculate power flow of the candidate islands,and determine whether there is a steady-state operat-ing point. For the island lacking of steady-state operating point,the corresponding power flow adjustment informa-tion has been put forward. Finally,actual power networks are used to present verification process and to verify its feasibility.