直流充电桩电能计量关键技术设计

Design of Key Technology for DC Charging Pile Power Metering

针对当前直流(DC)充电桩电能计量存在计量效率低、误差大、电源纹波大、无法远程监控的问题,设计了充电桩计量电路。通过硬件乘法器级联原理实现三相交流有功功率的瞬时值硬件电路,能够快速获取交流(AC)有功功率在时域上输出的数据信息。将原始的多种信息输出变成单一的DC信号,为双通道模数转换器(ADC)同步测量提供了μs级别的AC有功功率信号。通过增量补偿控制输出模块对电网电压和实际输出电压的差值进行补偿,提高了充电桩测试电源的精度。DC充电桩能够远程无线通信,实现了多地区多客户端界面和现场操作终端界面的操作流程和数据的实时同步,大幅提升了DC充电桩电能计量能力。试验结果证明,该设计误差低、计量效率高。

Aiming at the current direct current(DC)charging pile power metering problems of low metering efficiency,large error,large power ripple,and inability to remotely monitor,the charging pile metering circuit is designed.The hardware circuit of instantaneous value of three-phase alterating curent(AC)active power is realized through the principle of hardware multiplier cascade,which can quickly obtain the data information of AC active power output in the time domain.By turning the original multiple information output into a single DC signal,it providesμs-level AC active power signals for the simultaneous measurement of dual-channel analog-to-digital converter(ADC).Through the incremental compensation control output module to compensate the power grid voltage and the actual output voltage difference,to improve the accuracy of the charging pile test power.The DC charging pile can remote wireless communication,realize the multi-region multi-client interface and on-site operation terminal interface operation process and data real-time synchronization,greatly improve the DC charging pile power measurement ability.The test results show that the design has low error and high metering efficiency.