高准确度的超低频交流电压表设计  

Design of High Accuracy Ultra-Low-Frequency AC Voltage Meter

作　　者：何梓滨[1] 

机构地区：[1]北京东方计量测试研究所,北京100086

出　　处：《宇航计测技术》2011年第3期34-39,共6页Journal of Astronautic Metrology and Measurement

摘　　要：分析了超低频交流电压信号的测量方法,设计了基于采样计算方式的超低频交流电压测量方案。设计了以高速高精度A/D转换器和高性能DSP处理器为核心的超低频交流电压表硬件电路,设计了基于线性插值的非同步采样同步化算法,设计了基于复合梯形求积公式的有效值算法。对所研制的超低频交流电压表进行了量值溯源与校准测试,测试结果表明所研制的超低频交流电压表测量频率下限达到了0.001Hz,测量不确定度优于0.01%。This paper analyzed the measuring methods of the ultra-low-frequency AC voltage signal,and designed a measuring method based on sampling-calculation.Designed the hardware circuit structure of the ultra-low-frequency AC voltage meter based on high-speed precision A/D converter and high-performance DSP processor,and designed the synchronization algorithm for non-synchronous sampling based on linear interpolation,and designed the RMS algorithm based on the composite trapezoidal quadrature formula.Developed the ultra-low-frequency AC voltage meter,and calibrated and tested its specification.The results showed that the developed ultra-low frequency AC voltage meter measurement frequency limit reached 0.001Hz,and its measurement uncertainty was better than 0.01%.

关 键 词：超低频 交流电压表 非同步采样 同步化算法 DSP 

分 类 号：TM93[电气工程—电力电子与电力传动]