不同接入方式下限流电抗器参数计算方法研究  

Research on Reactor Parameters Calculation for Current Limiting in Different Access

作　　者：赵铁英[1] 刘俊领[2] 

机构地区：[1]河南理工大学电气工程与自动化学院 [2]河南理工大学能源科学与工程学院,河南焦作454000

出　　处：《电力科学与工程》2015年第3期40-45,共6页Electric Power Science and Engineering

基　　金：河南理工大学博士基金(60807/008)

摘　　要：为了限制短路电流水平,电力系统中多采用线路中串联限流电抗器的方法来限制短路电流,限流电抗的参数直接影响到短路电流水平。通过计算系统需要接入的电抗值,选择合适的电抗器参数,可以使短路电流保持在供电系统能够接受的范围。针对电力系统中限流电抗器的两种不同接入方式,对包含限流电抗器的配电网短路过程进行分析,根据不同接入方式下系统短路暂态过程中电流变化规律,结合故障时系统能够承受的最大电流水平,计算出限流电抗器需要提供的阻抗值,推导出限流电抗器参数阻抗值选择计算方法。结果表明在不同接入方式下,所需接入的电抗值不同,经故障限流器接入时,电抗器接入系统时间滞后于短路发生时间,因此为了获得相同的限流效果,需要选择阻抗值更高的限流电抗器。Current limiting reactor has higher resistance value, so it is widely used in power system in order to lim-it short circuit current.Current limiting reactor is involved in whole process in short circuit fault, which affects short circuit current level directly.Through calculating reactor impedance the system needed, we can choose cur-rent limiting reactor with proper impedance value and maintain short-circuit current at an acceptable range during the fault.In accordance with two different access ways connecting to the electrical power system, this paper ana-lyzed short circuit transient process of a distributing network with current limiting reactor, focused on current chan-ging law in short circuit process, combined with the maximum current system can sustain in fault, concluded a method to calculate current limiting reactor resistance needed.The results show that the impedance needed to con-nect to the system is different in different access ways.In fault current limiter access way, limiting reactor will con-nect to the system shortly after the fault occurs, so we need to choose a higher impedance reactor in order to get the same current limiting effect.

关 键 词：电力系统 短路 限流电抗器 接入方式 

分 类 号：TM47[电气工程—电器]