A comparison of the effectiveness of installing reactive power compensators,such as shunt capacitors,static var compensators(SVCs),and static synchronous compensators(STATCOMs),was presented in large-scale power netwo...A comparison of the effectiveness of installing reactive power compensators,such as shunt capacitors,static var compensators(SVCs),and static synchronous compensators(STATCOMs),was presented in large-scale power networks.A suitable bus was first identified using modal analysis method.The single shunt capacitor,single SVC,and single STATCOM were installed separately on the most critical bus.The effects of the installation of different devices on power loss reduction,voltage profile improvement,and voltage stability margin enhancement were examined and compared for 57-and 118-bus transmission systems.The comparative study results show that SVC,and STATCOM are expensive compared to shunt capacitor,yet the effect of installing STATCOM is better than SVC and the effect of installing SVC is better than that of shunt capacitor in achieving power loss reduction,voltage profile improvement and voltage stability margin enhancement.展开更多
特高压串补平台在投切操作过程中,串联隔离开关触头间会出现间歇电弧,同时引起特高压电容式电压互感器(capacitor voltage transformer,CVT)出现绝缘问题,因此非常有必要开展串补平台投切过程对CVT影响的相关研究。构建了实体串补平台、...特高压串补平台在投切操作过程中,串联隔离开关触头间会出现间歇电弧,同时引起特高压电容式电压互感器(capacitor voltage transformer,CVT)出现绝缘问题,因此非常有必要开展串补平台投切过程对CVT影响的相关研究。构建了实体串补平台、CVT和隔离开关回路实验来模拟特高压串补平台的投切操作,测量出投切过程中CVT上的快速暂态电压和电流;并通过对CVT内部电容元件的快速暂态电流试验,分析研究了串补平台投切过程中CVT的绝缘破坏机制和绝缘耐受强度。试验研究发现,在串联隔离开关操作时,线路电感、串补平台对地电容和CVT电容构成的回路中产生谐振过程,隔离开关触头间的间歇性电弧击穿会造成CVT承受多次的暂态过电压和过电流。另外,CVT电容器元件之间焊接点是最易发生绝缘故障的位置,并总结出目前CVT可以耐受幅值不高于4.5 k A的快速暂态电流。展开更多
为了研究长距离交流输电线路上并联电抗器布置对功率传输的影响,基于长距离超、特高压输电线路分布参数等效电路及二端口模型,分析了传输线路的最大传输功率及最大传输效率,推导了串补条件下两种并联电抗器布置方案的级联传输矩阵。采用...为了研究长距离交流输电线路上并联电抗器布置对功率传输的影响,基于长距离超、特高压输电线路分布参数等效电路及二端口模型,分析了传输线路的最大传输功率及最大传输效率,推导了串补条件下两种并联电抗器布置方案的级联传输矩阵。采用500 k V、1 100 k V线路典型参数,针对并联电抗器布置对最大传输功率与最大传输效率的影响进行数值模拟分析。研究结果表明并联电抗器位置在发送端与中点串补电容之间或者接收端与中点串补电容之间变化时,最大传输功率与最大传输效率均随其位置变化而发生变化。同时,并联电抗器补偿度也会影响功率传输,随着并联电抗器补偿度的增加最大传输功率及最大传输效率均会降低。展开更多
文摘A comparison of the effectiveness of installing reactive power compensators,such as shunt capacitors,static var compensators(SVCs),and static synchronous compensators(STATCOMs),was presented in large-scale power networks.A suitable bus was first identified using modal analysis method.The single shunt capacitor,single SVC,and single STATCOM were installed separately on the most critical bus.The effects of the installation of different devices on power loss reduction,voltage profile improvement,and voltage stability margin enhancement were examined and compared for 57-and 118-bus transmission systems.The comparative study results show that SVC,and STATCOM are expensive compared to shunt capacitor,yet the effect of installing STATCOM is better than SVC and the effect of installing SVC is better than that of shunt capacitor in achieving power loss reduction,voltage profile improvement and voltage stability margin enhancement.
文摘特高压串补平台在投切操作过程中,串联隔离开关触头间会出现间歇电弧,同时引起特高压电容式电压互感器(capacitor voltage transformer,CVT)出现绝缘问题,因此非常有必要开展串补平台投切过程对CVT影响的相关研究。构建了实体串补平台、CVT和隔离开关回路实验来模拟特高压串补平台的投切操作,测量出投切过程中CVT上的快速暂态电压和电流;并通过对CVT内部电容元件的快速暂态电流试验,分析研究了串补平台投切过程中CVT的绝缘破坏机制和绝缘耐受强度。试验研究发现,在串联隔离开关操作时,线路电感、串补平台对地电容和CVT电容构成的回路中产生谐振过程,隔离开关触头间的间歇性电弧击穿会造成CVT承受多次的暂态过电压和过电流。另外,CVT电容器元件之间焊接点是最易发生绝缘故障的位置,并总结出目前CVT可以耐受幅值不高于4.5 k A的快速暂态电流。
文摘为了研究长距离交流输电线路上并联电抗器布置对功率传输的影响,基于长距离超、特高压输电线路分布参数等效电路及二端口模型,分析了传输线路的最大传输功率及最大传输效率,推导了串补条件下两种并联电抗器布置方案的级联传输矩阵。采用500 k V、1 100 k V线路典型参数,针对并联电抗器布置对最大传输功率与最大传输效率的影响进行数值模拟分析。研究结果表明并联电抗器位置在发送端与中点串补电容之间或者接收端与中点串补电容之间变化时,最大传输功率与最大传输效率均随其位置变化而发生变化。同时,并联电抗器补偿度也会影响功率传输,随着并联电抗器补偿度的增加最大传输功率及最大传输效率均会降低。
