充电桩直流计量模块现场检测装置及其溯源

为顺应电动汽车充电桩直流计量模块的现场检测要求,研制了一种表源一体化现场检测装置.该装置的源输出反馈调节模块和标准功率计量模块共用一套传感器.电压环节采用精密电阻分压测量方案;电流环节采用零磁通测量方案,零磁通电流互感器的反馈调节部分以二次谐波分量为敏感值,通过二阶滤波和两级放大实现提取.设计了分部式同步溯源方案校准该装置,对误差校准结果进行了不确定度评定.结果表明该装置在典型充电工况下准确度最佳,其他工况下的计量性能也满足溯源要求.

Field detection device for DC charging pile power metering module and its traceability

In order to calibrate DC power metering modules in the electric vehicle charging pile in the field,developed a field detection device based on source and meter integration design.In the device,the power source module and the standard power metering module shared a set of transducer.In the device,voltage was measured by precise resistance voltage divider,current was measured by zero flux current transformer.In the zero flux current transformer,measuring sensitive parameter for feedback regulation was second harmonic component,which was extracted by second-order filter and 2 stage amplifier.Designed a distributed synchronous traceability scheme.Evaluated uncertainty of calibration result.The results of calibration and evaluation indicate that the measurement accuracy is most high in the typical charging condition,and satisfy demand in the other charging condition.