【作者】 张宗杰；

【导师】 徐玉琴；

【作者基本信息】 华北电力大学 ， 电力系统及其自动化， 2011， 硕士

【摘要】 近几年来,随着配电网的不断发展,城市电网中电缆线路的比例越来越高,使得电网的对地电容电流增加,当电网发生单相接地故障时,接地电弧不能自行熄灭。为解决这一问题,我国配电网多采用中性点经消弧线圈接地方式。本文在此背景下,研究了高短路阻抗变压器式消弧线圈,该消弧线圈具有响应速度快、电感量连续可调的优点。首先,对高短路阻抗变压器式消弧线圈的结构和工作原理进行研究,建立数学模型,推导参数之间的基本关系式。随后,利用Matlab/Simulink仿真软件建立高短路阻抗变压器式消弧线圈的仿真模型,来模拟其运行的电气特性,并且搭建10kV配电网模型,仿真电网发生单相接地故障时,消弧线圈对电网电容电流的补偿效果。通过仿真实验,分析出当高短路阻抗变压器式消弧线圈调节范围满足实际应用要求时,一次侧电流谐波问题严重,不利于电弧的自行熄灭。为解决高短路阻抗变压器式消弧线圈的谐波污染问题,设计单相有源电力滤波器,并且在Matlab/Simulink仿真软件中建立仿真模型,仿真结果有力的证明了该方法能够有效地抑制高短路阻抗变压式消弧线圈一次侧电流谐波。最后根据谐振接地系统的要求,设计高短路阻抗变压器式消弧线圈控制系统,侧重设计以PIC单片机为核心的触发脉冲控制部分。更多还原

【Abstract】 In recent years, with the continuous development of distribution networks, the scale of power grid is increasing rapidly.What`s more,with the large use of cable lines, the grounding capacitance current is increasing,thus the grounding faults increasing notably and grounding arc can’t be self-extinguished,which makes the situation worse. In order to solve this issue,the compensating method of neutral point grounding through Peterson coil is commonly used in our country.Due to this background,the paper studies the high short-circuit impedance transformer arc suppression coil,whitch has the advantages of adjustable inductance and fast response.Firstly,according to the sructure and working principle of the high short-circuit impedance transformer arc suppression coil,established its mathemati- cal model,derived the basic relatioship between the parametes. Secondly, using Matlab / Simulink simulation software to establish its computer simulation model ,whitch can simulate the electrical characteristics of its operation. And using this software to establish 10kV distribution network simulation model, whitch can simulate Peterson coil compensation for the grounding capacitance current.By doing the simulation , we found that when the adjustment range of the high short-circuit impedance transformer arc suppression coil met the actual requiremen- ts,the problem of harmonic current is serious,whitch is not conductive to extinguish the arc.To solve the problem, designed the Single-phase Active Power Filter for he high short-circuit impedance transformer arc suppression coil.And using Matlab / Simulink simulation software to establish its computer simulation model . The simulation results show that the Single-phase Active Power Filter can effectively suppress the harmonic current of the high short-circuit impedance transformer arc suppression coil to solve the problem.Finally, according to the requirements of resonant grounding system ,designed the control system of the high short-circuit impedance transformer arc suppression coil .And designed in detail the trigger pulse control section,which is based on the PIC microcontroller.更多还原