基于电力电子电抗器的起动补偿一体化装置

Starting Compensation Integrated Device Based on Power Electronic Reactor

针对高压大功率电动机起动电流大、起动过程中功率因数低的问题,提出一种基于电力电子电抗器的软起动无功功率补偿一体化方法,设计了该一体化装置的拓扑结构,研究分析了该一体化装置的工作原理。针对起动过程中无功功率补偿问题,采用无功功率就地补偿方法,减小起动引起的电网降压。为了获得较好的无功功率补偿效果,提出一种实用的基于电网压降允许值的无功功率补偿量工程计算方法,该方法可以准确地计算出无功功率补偿量。最后,以19 000 kW/10kV电动机为对象,通过仿真及实验验证了该一体化装置可以有效减小电动机的起动电流,提高电动机起动过程中的功率因数,减小电动机起动过程中的电网电压降幅。

In order to deal with these problems caused by the high-voltage large power motors start-up direct-on-line, such as too large starting eurrent,low power factor in the starting process and so on,a design method which integrates soft starter with reactive power compensation based on power electronic reactor is proposed,the topology of the integrated device is completed,and the working principle of the integrated device is researched,and reduce the grid buck caused by starting.In order to obtain better reactive power compensation effect,a reactive power on-site compensation method is adopted,and a practical reactive power compensation engineering calculation method which can accurately calculate the capacity of the reactive power compensation is proposed.Finally,a 19 000 kW/10 kV motor is selected as a research object,the results of simulation and experiment all show that the integrated device can effectively reduce the starting current,inerease the power factor,and reduce the voltage drop of the power grid during the motor starting.