模拟量输入合并单元计量性能检测研究

Research on Metering Performance Testing of Analog-Input Merging Unit

针对模拟量输入合并单元计量误差特性及相关测试项目,研究了检测装置的技术方案。提出了基于时钟同步法的信号生成技术,降低了相位噪声;采用自适应直流供电系统和热保护技术,增强装置可靠性;构建了基于NI PCI-4472的合并单元校验系统,满足0.2级及以下等级合并单元测试。对三个厂家的合并单元进行了测试,结果表明,所测合并单元的部分计量性能需要提高才能确保电能计量准确。研究结果可推进相关标准制定,有利于提升数字化电能计量系统的可靠性和准确度,促进智能电网建设。

This paper examined the technical solution for detection devices for the measurement error characteristics of the analog-input merging unit and related test items.It proposed a signal generation technology based on the clock synchronization method to reduce phase noise.It used an adaptive DC power supply system and thermal protection technology to enhance the device’s reliability.It also constructed a merging unit verification system based on NI PCI-4472 to meet the merging unit test of level 0.2 and below.By testing the combined units of the three manufacturers,the results showed that part of the measurement performance of the tested combined units needs to be improved to ensure the accuracy of electric energy measurement.The research result can promote the formulation of relevant standards,which is conducive to improving the reliability and accuracy of the digital electric energy measurement system and promoting the construction of smart grids.