基于支路开断直流模拟法的黑箱外网参数估计研究

针对黑箱外网参数估计难以求解以及不稳定问题，提出了基于支路开断直流模拟法的黑箱外网参数估计新方法。该方法基于输网电阻远小于电抗的原理简化扩展电压源支路模型，利用支路开断直流模拟法构建边界节点间等值电纳与采样状态的线性关系，使得边界节点间等值电纳参数求解简单而且稳定；进一步利用支路开断前后的状态数据建立扩展支路参数的最小二乘模型，最终通过支路开断前后两个数据断面实现外网等值参数的高精度求解，IEEE39节点系统的仿真结果论证了本文方法的准确性。

Black-box Parameter Estimation of External Network Based on Branch Outage DC Simulation Method

In view of difficulties and instability problems in solving the black-box parameters of external network， this paper proposes a new method for estimating the black-box parameters of the external network based on branch outage DC simulation method. The extended voltage-source-branch model is simplified based on the principle that the resistance of transmission grid is much smaller than the reactance. The linear relation between equivalent susceptance among boundary nodes and sampling state is constructed by using the branch outage DC simulation method， which makes the calculation process of the equivalent susceptance among boundary nodes simple and stable. Furthermore, the least squares model of the extended branch parameters is established by using the state data before and after the branch outage. Finally， the two measurement snapshots before and after the branch outage are used to obtain the high-precision solution to the external network equivalent parameters. The simulation results of IEEE 39-node system demonstrate the accuracy of the proposed method.