摘要
针对220 kV板桥变低压侧3组高压并联电容器装置(以下简称电容器装置)投运时,主变高压侧和低压侧三相电流出现相位和波形畸变进行分析。通过现场谐波检测,并进行系统仿真等值计算分析,发现其缘由是由于220 kV系统中存在3次谐波电压源,且因板桥变低压侧电容器装置参数配置不合理,导致产生3次谐波串联谐振条件引起3次谐波电流放大,从而造成板桥变高压侧和低压侧电流相位和波形畸变。通过将板桥变其中1组电容器装置内5%串联电抗器调整为12%串联电抗器,以抑制3次谐波的放大,保证了板桥变的正常启动。
In this paper, the phase and the waveform distortion of three-phase current at both high volt- age and low voltage side of main transformer in case of switching on 3 sets of capacitors at low voltage side of 220 kV Banqiao substation are analyzed. By harmonic detection at site, system simulation and equivalent calculation,it is found that the existence of 3rd harmonic source at 220 kV system and the unreasonable layout of parameters for capacitors at low voltage side of Banqiao substation lead to series resonance of 3rd harmonics and enlargement of 3rdharmonic current and, consequently current phase and waveform distortion at high voltage side and low voltage side of Banqiao substation. 5% series re- actor is adjusted into 12% series reactor in one set of capacitor at Banqiao substation in order to sup- press enlargement of 3rd harmonics and assure normal operation of Banqiao substation.
出处
《电力电容器与无功补偿》
2013年第5期34-39,70,共7页
Power Capacitor & Reactive Power Compensation
关键词
变电站
电流波形
谐波
串联谐振
并联谐振
substation
phase
cm＇rent waveform
third harmonic
series resonance
parallel resonance
