保留非线性的交直流联合系统状态估计算法

针对当前交直流联合系统各种状态估计方法所遇到的问题,提出了一种新的有功、无功和直流方程解耦的快速分解状态估计算法.在估计过程中交直流方程交替求解,并对直流方程采用保留泰勒级数展开式中所有高阶项的方法.其特点是:一方面可以使直流方程雅可比矩阵在迭代过程中恒定,降低计算量;另一方面使算法保持了良好的收敛性能.文中在IEEE 14节点系统中构造了多端交直流联合系统,并进行了仿真.仿真结果验证了该算法的有效性和可行性.

State Estimation Algorithm Retaining Nonlinearity for AC/DC Combination System

Aiming at the questions encountered in various state estimation algorithms for AC/DC combination system, a new state estimation algorithm is proposed in this paper, which can make AC active power, reactive power and DC equations decoupled fast. In the process of state estimation, AC and DC equations are solved in turn, keeping all high order derivatives of Taylor series for the DC equation. Thus, the Jacobian matrix related to the DC equations can be constant in the iterative process, which decreases the computation burden. On the other hand, it also makes the proposed algorithm have good convergence performance. Basing on the IEEE 14-bus system, a multi-terminal DC/AC combination system is established and simulated. The simulation results show that the algorithm is effective and feasible.