基于高频暂态稀疏测量的复杂直流配电网故障定位

为了解决直流配电网中高速通信测量点不足、故障特征复杂等导致的故障定位精度差的问题,提出了一种适用于复杂直流配电网的新型直流极间短路故障定位算法.首先,根据高频瞬态电流环路,构建含有电平转换器和DC/DC转换器的高频阻抗等效模型为故障过程提供稳定的阻抗值.其次,利用BCS理论推导与稀疏测量点相对应的节点高频暂态电压方程....

Fault location of a complex DC distribution network based on high-frequency transient sparse measurement

To solve the problem of poor fault location accuracy caused by insufficient high-speed communication measurement points and complex fault characteristics in DC distribution networks, a new DC two-pole short-circuit fault location algorithm is proposed. First, a high-frequency impedance equivalent model containing a level shifter and a DC/DC converter is constructed to provide a stable impedance value for the fault process according to the high-frequency transient current loop. Secondly, the BCS theory is used to derive the high-frequency transient voltage equation of the node corresponding to the sparse measurement point. Finally, the node''s high-frequency transient current sparse vector is determined to achieve fault location, combining the node''s high-frequency transient voltage equation and Bayesian compressive sensing theory. The experimental results show that the proposed algorithm has a low requirement for the number of measurement points, does not need to measure data strictly synchronously, and is not affected by the control strategy and transition resistance of the converter, and has high fault location accuracy.This work is supported by the Key Research Project of Hebei Provincial Science and Technology Department (No. SCG2017442) and the Science and Technology Project of State Grid Hebei Electric Power Co., Ltd. (No. SGHEHS00FCJS1900440).