配电网自动无功补偿装置研制

为使配电网的无功补偿更加方便灵活,对高短路阻抗变压器型的新型可控电抗器与固定电容器组合作为配电网的自动无功补偿装置进行了研究。通过调节高短路阻抗变压器二次侧的晶闸管触发角,可以实现配电网中无功功率的动态自动无级补偿。根据变电站参数,合理选取电容器组和可控电抗器的容量,能实现变电站低压侧母线无功功率的自动跟踪和无级补偿。通过备用电容器投切的滞环控制律的设计,以减少电容器组的投切次数。对某一实际系统进行仿真测试的结果表明该装置能够实现无功的动态无级补偿,并具有良好的动态响应性能,对提高配电网的功率因数和抑制配电网的电压波动有明显效果。

Automatic reactive power compensator in distribution system

To make the compensation more flexible,an automatic reactive power compensator of distri-bution networks is developed,which combines high impedance TCT(Thyristor Control Transformer) with FC(Fixed Capacitors).The dynamic stepless compensation of reactive power in distribution networks is realized by changing the firing angle of thyristor at the secondary side of transformer with S / C high impedance.The number of capacitor group and the capability of controllable reactor are properly chosen according to substation parameters for its low-voltage busbar automatic stepless reactive power compensation.Hysteresis control is designed for standby capacitor to reduce its switching times.A practical system is simulated and results show that,the device can compensate the reactive power with better dynamic performance,which helps to restrain the voltage fluctuation and improve the power factor of distribution network.