高精度直流电能表测试系统的研制

为满足直流电在工业电力系统应用中的计量需求，克服传统电信号计量准确度不足，测量范围较窄等问题，设计了一种高精度直流电能表测试系统。系统以FPGA芯片为硬件控制核心，由零磁通传感器、精密采样电阻、高精度ADC等组成采样电路，进行大量高速数据的采集及处理，最终以电能脉冲输出形式表征功率和电能测试值，实现对直流电参数的计量校准。实验测试表明，该系统直流电压电流测试范围达到(0 ~1000)V和(0 ~200)A，在测试范围内可以满足电能计量0.02级的准确度要求。

Development of high precision DC Energy meter test system

In order to meet the measurement demand of direct current in the application of industrial power system, and overcome the problems of insufficient measurement accuracy and narrow measurement range of traditional electrical signals, a high precision DC Energy meter test system is designed. The system uses FPGA as the hardware control center, and the sampling circuit is composed of zero flux sensor, precision sampling resistor, high-precision ADC, etc. It collects and processes a large amount of high-speed data, and finally the power and electric energy test values are characterized in the form of electric energy pulse output, so as to achieve the measurement and calibration of DC parameters. The experimental results show that the test range of DC voltage and current of the system reaches (0~1000) V and (0~200) A respectively, within the test range, it can meet the accuracy requirements of 0.02 level of electric energy measurement.