基于多区域互联系统的一种分解协调电力系统损耗计算方法
首发时间:2012-05-21
摘要:为了实现分层和分布式计算结果的一致性,在大规模电力系统损耗计算中需要一种分解协调方法。本文提出了一种简单实用的两级算法。首先,将互联系统分成几个互联的子系统,属于相邻子系统的边界节点的测量数据,构成一个边界区域。电力系统损耗计算的概念是建立在状态估计的基础之上的。其次,该问题的KKT(库恩--塔克)等式条件很自然地被分成两类子集。一类是区域的状态估计,另一类是边界区域的协调方程。基于给定的边界状态并考虑已知的测量类型,前面的方程可以通过传统的潮流计算方程解决。再次,如果满足协调方程的误差条件,整个电力系统损耗计算就完成了。否则,用协调方程的计算结果来修正子系统中边界节点的状态。将该算法在实际电力系统中实施和测试。结果表明该方法的有效性。
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A decomposition and coordination power system loss calculation for multi-area interconnected system
Abstract:In order to realize hierarchical and distributed computation and keep results consistent, a decomposition-coordination approach is needed in large scale power system loss calculation. This paper proposes a simple and practical two-level algorithm. Firstly, the interconnected power system is divided into several overlapped subsystems. The boundary buses with measurement data, which belong to neighboring subsystem, constitute a boundary region. With the idea of state estimation, the power system loss calculation model is established. Then, the KKT(Karush-Kuhn-Tucker) condition equations of the problem are divided into two kinds of subsets naturally. One is regional state estimation, and the other is coordination equation of boundary region. With the given boundary state and considering the known measurements type, the former equation can be solved by the traditional power flow algorithm. Then, if the error condition of coordination equation is satisfied, the whole power system loss calculation is finished. Otherwise, the result of coordination equation is used to modify boundary buses state in subsystem. The algorithm is implemented and tested using a real power system. The result indicates the validity of the approach.In this paper.
Keywords: electric power system distributed calculation power loss calculation state estimation
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