基于电压暂降监测点优化配置的同心松弛凹陷域分析

提出了一种基于电压暂降监测点优化配置的同心松弛凹陷域分析方法。在传统MRA法的基础上，根据变压器的接线方式以及故障点的位置构建系统的零序节点阻抗矩阵，修正电压暂降幅值，克服了传统MRA法存在监测盲区的缺点，实现对实际配电网的电压暂降监测点优化配置以及故障定位。根据监测点布点方案以及故障点定位结果，提出以故障点为中心的同心松弛凹陷域，定义的提出及分析计算可以有效减少供电部门凹陷域计算的工作量，为解决由于电压暂降带来的责任归属问题提供理论依据。通过对含有多个电压等级的实际配电网进行仿真分析，验证了该方法的实用性与有效性。

An analysis to the concentric relaxation vulnerability area of voltage sag based on optimal allocation of voltage sag monitors

A method to analyze the concentric relaxation vulnerability area of voltage sag based on optimal allocation of voltage sag monitors is proposed. On the basis of traditional MRA method, zero sequence impedance matrix is constructed according to the transformer connection mode and fault point location, on this basis, the amplitude of voltage sag is modified, which overcomes the shortcomings of monitoring blind spot existing in the traditional MRA method. Then the optimal allocation of the voltage sag monitoring points and fault location of the actual distribution network are realized. According to allocation of voltage sag monitors and result of fault location, the concentric relaxation vulnerability whose center is the fault point is proposed. The proposed definition can effectively reduce the workload involved in traditional voltage sag vulnerability areas and provide us a judgment reference of the attribution of liabilities between power supply department and power users. The practicability and effectiveness of the proposed method are verified by the simulation of the actual distribution network with multiple voltage levels. This work is supported by Natural Science Foundation of Shandong Province (No. ZR2012EEM026).