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为了综合治理电气化铁路给电网带来的低功率因数、高谐波含量和大负序电流的问题,改变目前仅通过补偿无功功率来提高功率因数的现状,提出了在每个牵引臂安装一套晶闸管相控电抗器与固定电容器相结合的静止无功补偿器,通过对整个变电站无功功率的综合控制来提高功率因数、稳定电网电压、抑制谐波并改善负序电流;同时分析了该静止无功补偿器的拓扑结构和无功控制的数学模型及无功计算。在怀化供电段涟源牵引变电站的运行结果表明:装置投运后功率因数从0.8提高到0.96,不平衡度由原来的20.43%下降到1.81%;谐波和负序电流都有较大程度的减少。实践证明,基于无功控制的动态无功补偿方法可改善牵引网的电能质量。
In order to comprehensively deal with the problems of low power factor, high harmonic content and large negative current caused by electrified railway to the power grid and to change the present situation of improving the power factor only by compensating reactive power, Thyristor thyristor reactor and fixed capacitor combination of static var compensator, through the overall control of the substation reactive power to improve the power factor, the stability of the grid voltage, harmonic suppression and improve the negative sequence current; while the analysis of the Topology of Static Var Compensator and Mathematical Model of Reactive Power Control and Reactive Power Calculation. The operation results of Lianyuan traction substation in Huaihua Power Supply Section show that the power factor of the unit increases from 0.8 to 0.96 and the imbalance decreases from 20.43% to 1.81%. The harmonic and the negative sequence current have a great reduction. Practice has proved that reactive power compensation based on reactive power compensation can improve traction network power quality.