多端交直流系统状态估计

AC/MTDC POWER SYSTEM STATE ESTIMATION

综合分析了近些年来关于多端交直流系统 (AC/MT DC)状态估计的算法 ,并提出了一种AC/MTDC状态估计分析的新算法———改进交替求解法。此方法由于在对交流系统和直流系统进行解耦时未忽略耦合量 ,所以可以保证算法的收敛性。同时 ,由于对交直流系统实现了解耦 ,此算法可以采用简便的交直流系统交替迭代形式 ,并能很方便地与现有的交流状态估计算法相结合 ,且实现简单。算例验证了所提出的方法是正确的、有效的。

This paper reports the development of a novel and effective approach in AC/MTDC (Multi terminal DC) power system state estimation, called improved sequential method. The proposed approach is sequential in nature in which the MTDC system is solved followed by the AC system. Because the new method decouples the AC system and MTDC system without neglecting the coupling submatrices in the gain matrix, it exhibits good convergence characteristics compared to conventional techniques. The variables and measurement equations of the MTDC system related to the problem formulation are discussed. The effectiveness of the proposed algorithm is demonstrated in this paper with extensive testing in several test systems and the results are compared with the other state estimators.