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针对目前电气化铁道产生大量谐波及无功功率的现状,以及现有固定电容器式无功功率补偿方式常产生容性过补,与电网谐振、补偿装置自身过载及滤波效果差等问题,提出了一种基于变压器式可控电抗器的改进型静止动态无功补偿器的新模型.在带气隙的变压器二次侧设置若干组绕组,每组绕组用反并联晶闸管控制其导通程度,可平滑连续调节可控电抗器的功率.通过改变级间容量递增系数,从而实现无功功率的动态补偿.这种方法具有可控电抗器不饱和、产生谐波电流小的优点,变压器二次侧电压低,利于电力电子器件的长期可靠工程化运行.试验表明,设计出的模型具有良好的动态无功功率补偿性能.
In view of the present situation of a great deal of harmonic and reactive power generated in electrified railway, as well as the existing capacitive overcompensation, resonance with the power grid, overloading of the compensation device and poor filtering effect of the existing fixed capacitor reactive power compensation methods, A New Model of Improved Static Dynamic VAR Compensator Based on Transformer Controllable Reactor Several sets of windings are set on the secondary side of the transformer with air gap and each winding is controlled by its anti-parallel thyristor to control its conduction. Smooth and continuous regulation of the controllable reactor power.It can realize dynamic compensation of reactive power by changing the interstage capacity increment coefficient.This method has the advantages of controllable reactor unsaturated and small harmonic current generation.The transformer secondary side Low voltage is conducive to the long-term reliable engineering operation of power electronic devices.Experiments show that the designed model has good dynamic reactive power compensation performance.