750 kV电网对陕西无功电压和线损的影响

Influence of 750 kV Power Grid on Shaanxi Reactive Voltage and Line Loss

750 kV电网将于2009年进入陕西,未来陕西电网的主网架将由750 kV电网构成。分析了750 kV电网对无功电压和线损带来的影响,认为甘陕断面750 kV联络线的无功交换对于陕西电网的电压控制能力有着显著的影响,影响程度和乾县变电站主变压器的档位有关。当750 kV电网设备发生N-1和N-2故障时,除信延线故障外,其他情况下电网电压都不会发生越限。在750 kV电网建设的各个阶段,只要合理配置无功补偿设备,陕西电网电压都可以控制到令人满意的水平。

750 kV power grid will enter Shaanxi province in 2009. The future main power grid structure will be 750 kV power grid. The effect of 750 kV power grid upon reactive voltage and line loss is analyzed. The reactive power exchange between Gansu and Shaanxi section has great influence on the voltage regulation capacity,which is related with the scale of voltage tap of the transformer at Qianxian substation. When N-1 and N-2 fault of the devices belonging to the 750 kV power grid happen, the voltage does not go beyond the voltage limitation except the line from Xinyi substation to Yan＇an substation.