摘要
在周期电气信号的微机测量中普遍采用等间隔同步交流采样。采样时间间隔不均匀或采样周期与信号周期不同步,均会导致测量误差。该文对目前常用的硬件同步采样、软件同步采样和异步采样三种交流采样方式的同步方法进行分析,针对其同步误差的产生原因,提出了相应的消除或减小同步误差的改进方法。这些方法实现简单,应用范围广,给计算机增加的工作量小,能显著提高测量精度。对谐波测量的仿真结果和科研实践证实了这些方法的可行性和有效性。它们对交流电参量微机测量装置的软、硬件设计,具有指导和参考价值。
In digital measurement of period electric signals, uniform and synchronous sampling is a commonly used method with high performance and low computational complexity. However, in practice, precisely uniform and synchronous sampling is not easy to realize, and consequent undesired effects to measurement are brought in. In this paper, the traditional synchronization methods of AC sampling are examined and the factors that cause uniformity error and synchronization error are found out. Some novel methods, designed to minish the synchronous errors and improve measurement accuracy, are whereafter proposed. They are easy to realize, can be widely applied and need less additional work. The results of both the simulations of harmonic measurement and the experiments show that the proposed methods are feasible and effective. All the methods are helpful for the soft- and hardware design of the instrument of electric parameter measurement.
出处
《中国电机工程学报》
EI
CSCD
北大核心
2002年第9期38-42,共5页
Proceedings of the CSEE
基金
国家自然科学基金项目(59707002)
湖南省电力科技攻关项目(20003027)。~~
关键词
电气信号
测量
微机
交流采样
同步方法
synchronization
AC sampling
electric para-meter
error
measurement
