特高压输电线路并联电抗器补偿方案

Research on Three-Phase Shunt Reactor Compensation of UHV Transmission Lines

在特高压线路中,并联电抗器起限制工频过电压、抑制潜供电流、避免谐振过电压以及无功平衡等作用。首先研究了并联电抗器限制工频过电压的特性,分析计算表明并联电抗器仅可以有效抑制所在端的甩负荷工频过电压,为保障线路沿线电压均分布在允许范围,当线路长度超过550 km时宜采用分段补偿;然后分析了潜供电流和非全相谐振的原理以及它们与补偿度的关系;最后给出了并联电抗器配置的原则和计算方法。

The shunt reactor has the function of limiting the power frequency overvohage, inhibiting secondary arc current, avoiding the resonance overvohage and keeping reactive power balance in the ultra high voltage （UHV） transmission line. The characteristics of the shunt reactor for limiting power frequency overvohage are studied firstly, which shows that the shunt reactors can only effectively suppressed the load shedding power frequency overvoltage where the shunt reactors are located. In order to ensure the voltage along the line controlled in the allowable range, sectional compensation should be used for the llne of more than 550 km in length. Then an analysis is made on the principle of the secondary arc current and the non full phase resonance and their relationship with the shunt compensation degree. Finally, the configurations principles and calculation methods of shunt reactor are proposed.