配电网电压暂降源定位研究

发布时间：2018-01-04 20:15

本文关键词：配电网电压暂降源定位研究　出处：《中国矿业大学》2016年硕士论文　论文类型：学位论文

【摘要】：现代电力电子技术高速发展,敏感电力负荷大量应用,而敏感电力负荷对电能质量的要求相较传统负荷更高,由此造成的用户对电能质量问题的投诉愈加频繁,其中80%的投诉事件涉及电压暂降。电压暂降早已成为最严重的动态电能质量问题。电压暂降源定位,就是确定暂降源位于监测装置的哪一侧。准确的电压暂降源定位能够有效界定配电网中引起电压暂降的责任方,为供、用电双方提供解决矛盾的理论依据,同时,暂降源的定位能够有效评估配电网的薄弱环节,为电网改造提供指导意见。首先,本文以盱眙县梁营变电所供电区域配网为例,研究20k V配电网发生各种短路故障等扰动时,电压暂降的传播域和影响强度,为有效减弱电压暂降在配电网的危害提供建议。其次,在详细介绍现有暂降源定位方法的基础上,本文对已有5种定位方法建模仿真分析,指出包括扰动能量和扰动功率法(Disturbance Energy and Power,DEP)、电流实部极性法(Real Current Component,RCC)、系统轨迹斜率法(Slope of System Trajectory,SST)、距离阻抗继电器法(Distance Relay,DR)和等效阻抗实部极性法(Resistance Sign,RS)等定位方法的优势和缺陷。在此基础上,文章从电网故障分析入手,运用线性电路叠加定理,提出新的基于扰动功率极性的暂降源定位方法:以监测装置内电压电流互感器同极性方向为参考方向,若监测到的扰动功率为正,则电压暂降源位于监测装置的上游;反之,若监测到的扰动功率为负,则电压暂降源位于下游。在双端供电系统、辐射式电网、IEEE9节点标准环形电网等网架结构下仿真测试包括单相接地故障、两相接地故障、相间短路故障和三相短路在内的各种短路故障扰动以及大电机启动、电容投切等扰动类型,验证了该方法的准确性。文章最后设计了电压暂降源在线定位与监测装置及配电网扰动定位与电能质量在线监测分析系统,并通过实验证明本文方法适用于包括辐射式电网、双端供电网以及环形电网在内的各种网架结构。
[Abstract]:The rapid development of modern power electronic technology, a large number of application of the sensitive power load, power load and sensitive to power quality requirements compared to the traditional load is higher, the resulting user power quality problems become more and more frequent complaints, including complaints 80% voltage sag events. Voltage sag has become the most dynamic power quality problems. Serious. The voltage sag source location, is to determine which side is located in the sag source monitoring device. The accurate location of voltage sag source can effectively define the voltage sags in distribution network caused by the responsible party, for electricity, both to provide theoretical basis to solve the contradiction, at the same time, the voltage sag source location can be the effective evaluation of the weak link of the distribution network, to provide guidance for power grids. Firstly, this paper takes Xuyi County Liang Ying substation power distribution network as an example, all kinds of faults of 20K V distribution network disturbance etc., The spread of domain and the effect of voltage sags, to provide advice on the harm of distribution network is effectively reduced voltage sag. Secondly, based on the detailed introduction of the existing sag source location method, modeling simulation and analysis of the existing 5 kinds of positioning methods, pointed out that including the disturbance energy and disturbance power method (Disturbance Energy and Power. DEP), current real polarity method (Real Current Component, RCC), the system trajectory slope method (Slope of System Trajectory, SST), distance (Distance Relay, impedance relay method DR) and the equivalent impedance polarity method (Resistance Sign RS) the advantages and disadvantages of other positioning methods. On the basis of this paper, from the analysis of the fault of circuit using linear superposition theorem, put forward a new method of sag source location disturbance power polarity based on monitoring device voltage and current transformer polarity direction for the reference direction, if detected The disturbance power is upstream of the voltage sag source in the monitoring device; on the other hand, if the disturbance power monitoring is negative, then the voltage sag source located downstream. In the double end power supply system, radiant power grid, simulation test of IEEE9 node standard circular grid grid structure including single phase grounding fault, two-phase grounding fault, fault phase and three-phase short circuit fault disturbance and large motor starting, capacitor switching disturbance type, verified the accuracy of the method. Finally the design of voltage sag source location and online monitoring device and distribution network disturbance localization and on-line monitoring of power quality analysis system, and through experiments to prove that this method is applicable to include radiation power grid, power supply network and double end ring grid, all kinds of network structure.

【学位授予单位】：中国矿业大学
【学位级别】：硕士
【学位授予年份】：2016
【分类号】：TM714.2

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