基于故障分量功率特征的电压暂降源定位方法研究

发布时间：2018-01-18 11:38

本文关键词：基于故障分量功率特征的电压暂降源定位方法研究　出处：《西安科技大学》2017年硕士论文　论文类型：学位论文

【摘要】：电压暂降影响供电的电能质量,造成严重的经济损失;而且会引起供电方和用电方的经济纠纷。准确的电压暂降源定位,对判断电压暂降源在系统中的相对位置,及电力系统的安全、经济运行具有重要的意义。本文针对短路故障引起的电压暂降进行定位研究。提出了基于故障分量功率的电压暂降源定位方法。应用线性电路叠加定理,将故障网络分,解为稳态网络和故障分量网络;分析了故障分量瞬时功率的特征规律。提出了基于故障分量瞬时功率的电压暂降源定位方法,若监测到的故障分量瞬时功率为正,则电压暂降源位于监测装置的上游;反之,若监测到的故障分量瞬时功率为负,则电压暂降源位于下游。此方法主要用于对称故障引起的电压暂降。为解决故障分量功率定位法无法定位不对称暂降的问题,本文利用改进的瞬时对称分量法,将故障分量网络分解为故障分量正序、负序和零序网络;定义故障分量序功率,分析了故障分量序功率的特征规律。提出了基于故障分量序功率的电压暂降源定位方法,若监测到的故障分量瞬时正序(负序)功率为正,则电压暂降源位于监测装置的上游;反之,若监测到的故障分量瞬时正序(负序)功率为负,则电压暂降源位于下游。此方法对不对称故障和对称故障引起的电压暂降均能有效定位。研究了电压暂降源的定位方案,融合两种定位方法,选用运算量更小的故障分量功率法定位对称暂降,选用对任何暂降都能准确定位的故障分量序功率法定位不对称暂降。定位方案可准确、快速的实现电压暂降源定位。利用MATLAB/Simulink搭建双电源供电系统模型,对不同故障点和各种不同短路类型进行仿真分析。仿真结果表明文中所给出的定位方案对称故障和不对称故障引起的电压暂降均能有效定位,定位准确率高。
[Abstract]:The voltage sags affect the power quality of power supply, causing serious economic losses; and will cause the power supply side and the electricity side of the economic disputes. The accurate location of voltage sag source, to determine the relative position of the voltage sag source in the system, and the safety of the power system, the economic operation has important significance. According to the short circuit fault caused by voltage sag is proposed. The localization of voltage sags based on fault component of power source localization method. Application of superposition theorem, the solutions for the steady-state fault network, and network fault component network; analyzes the characteristics of instantaneous power fault component is proposed. The voltage instantaneous power failure component based on sag source location method, if the fault component instantaneous power monitoring is positive, upstream of the voltage sag source in the monitoring device; on the contrary, if the fault component instantaneous power monitoring is negative, then The voltage sag source located downstream. This method is mainly used for voltage sag caused by symmetrical fault. In order to solve the fault location method cannot locate the asymmetric component power sag problem, this paper uses the improved instantaneous symmetrical component method, the fault component network is decomposed into fault component positive sequence, negative sequence and zero sequence fault component sequence power network; definition analysis of the characteristics of fault component, sequence power was put forward. Based on sequence power fault voltage sag source location method, if the positive sequence fault component instantaneous monitoring to the (negative) power is upstream of the voltage sag source in the monitoring device; on the contrary, if the positive sequence fault component instantaneous monitoring to the (negative sequence power) is negative, then the voltage sag source located downstream. This method of asymmetric fault voltage and symmetrical fault caused by sags are effective positioning. Positioning square of voltage sag source case, fusion two Positioning method, positioning method using power fault component symmetrical smaller computational sag, the fault component sequence power asymmetry on any method can accurately locate the sag sag. Positioning scheme can accurately and quickly realize the voltage sag source location. The use of MATLAB/Simulink to build a double power supply system model for different fault and a variety of different fault types are simulated. The simulation results show that the voltage caused by symmetrical fault and asymmetric fault location scheme is given in the paper of the sag are effective positioning accuracy.

【学位授予单位】：西安科技大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TM714.2

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