基于直流擾動(dòng)功率的直流配電網(wǎng)電壓暫降源定位
魯濤1，呂干云1，賈德香2，王程2，徐曉東1
（1 南京工程學(xué)院 電力工程學(xué)院，江蘇 南京 211167；2 國(guó)網(wǎng)能源研究院有限公司，北京 102209）
摘 要：電壓暫降源定位對(duì)解決相應(yīng)供用電雙方糾紛及責(zé)任認(rèn)定等起到重要作用。提出一種基于直流擾動(dòng)功率法的直流配電網(wǎng)電壓暫降源定位方法，分析了導(dǎo)致直流配電網(wǎng)電壓暫降的典型原因，將故障狀態(tài)分解為正常狀態(tài)和擾動(dòng)狀態(tài)的疊加，建立直流擾動(dòng)功率與擾動(dòng)源位置之間的對(duì)應(yīng)關(guān)系，根據(jù)直流擾動(dòng)功率的正負(fù)來判斷暫降源的位置。在Simulink平臺(tái)上搭建了直流配電網(wǎng)暫降分析仿真模型，分別對(duì)直流配電網(wǎng)的外部交流電網(wǎng)故障與內(nèi)部故障引起的電壓暫降進(jìn)行源定位分析。仿真實(shí)驗(yàn)結(jié)果表明，該方法可有效完成直流配電網(wǎng)電壓暫降源的定位，具有應(yīng)用范圍較廣、可靠性高的優(yōu)點(diǎn)。
關(guān)鍵詞：直流配電網(wǎng)；電壓暫降源定位；直流擾動(dòng)功率
中圖分類號(hào)：TM711 文獻(xiàn)標(biāo)識(shí)碼：A 文章編號(hào)：1007-3175(2020)06-0001-04
Voltage Sag Source Location of DC Distribution Network Based on DC Disturbance Power
LU Tao1, LYU Gan-yun1, JIA De-xiang2, WANG Cheng2, XU Xiao-dong1
（1 School of Electric Power Engineering, Nanjing Institute of Technology, Nanjing 2111 67, China;
2 State Grid Energy Research Institute Co., Ltd, Beijing 102209, China）
Abstract: The location of voltage sag source plays an important role in solving the disputes and identifying responsibility between two power supply companies. In this paper, a method for locating source of voltage sag in DC distribution network based on DC disturbance power is provided; the typical causes of the voltage sag in the DC distribution network are analyzed, and the fault state is decomposed into the superposition of the normal state and the disturbance state, and establish the correspondence between the DC disturbance power and the location of the disturbance source, and determine the location of the sag source according to the positive and negative of the DC disturbance power. A DC distribution network sag analysis simulation model was built on Simulink to analyze the source locating caused by the external AC grid fault and internal fault caused by the internal distribution network. Simulation results show that the proposed method can accomplish locates the sag source from upstream or downstream.
Key words: DC distribution network; voltage sag source location; DC disturbing power
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