三相交流充电桩对电压暂降敏感度的试验研究

Experimental Research on Sensitivity of Three-phase AC Charging Pile During Voltage Sag

随着电动汽车三相交流充电桩的研发与使用,电能质量问题在三相交流充电桩的使用中愈发重要,采用Chroma 61860回收式电网模拟电源对电动汽车三相交流充电桩遭受的电压暂降情况进行模拟。该试验采用模拟握手的方法避免电压暂降对电动汽车的影响,只对三相交流充电桩产生影响,降低测试成本。依据试验数据,绘制三相交流充电桩的电压暂降敏感度曲线,试验表明当供电电源发生电压暂降时会对交流充电桩的电压模块产生影响。当发生电压暂降时,三相交流充电桩电源模块的工作能力下降,随着电压暂降的次数增多,交流充电桩对电压暂降幅值的耐受能力逐渐下降,即暂降发生后能够使充电桩正常工作的最低工作电压增高,试验中所用充电桩在发生电压暂降后能够正常工作的最低工作电压初始为35 V,随着试验次数的增多,其在暂降后的最低工作电压升高为38 V。

With the development and application of three-phase AC charging pile for electric vehicles,power quality is becoming more and more important in the use of three-phase AC charging pile.Chroma 61860 reclaimed power grid analog power supply is used to simulate the voltage sag of three-phase AC charging pile for electric vehicle.In this experiment,a simulated handshake method is used to avoid the influence of voltage sag on electric vehicle,which only affects the three-phase AC charging pile and reduces the test cost.According to the test data,the voltage sag sensitivity curve of three-phase AC charging pile is drawn.The test shows that the voltage sag of power supply will affect the voltage module of AC charging pile.When voltage sag occurs,the working ability of power supply module of threephase AC charging pile decreases.With the increase of voltage sag times,the endurance ability of AC charging pile to voltage sag amplitude decreases gradually.That is to say,the lowest working voltage of charging pile can be increased after sag occurs.The lowest working voltage that can work normally after voltage sag is initially 35 V.With the increase of test times,the lowest working voltage after voltage sag increases to 38 V.