摘要
希尔伯特变换在数字信号处理理论和应用中有着十分重要的作用,它维系着对离散序列进行傅里叶变换后的实部和虚部之间或者幅度和相位之间的关系。而现代电力工业的高速发展对无功电能计量提出了更高的要求。本文阐述了无功计量理论及Hilbert移相无功算法及其仿真应用,并给出了采样点平移无功算法与Hilbert移相无功算法的误差对比。数据表明Hilbert移相无功算法具有移相准确,计量精度高的特点,本算法已在以DSP为运算单元的多功能电能表中应用。
Hilbert transform plays an important role in digital signal processing theory and applications to maintain the relationships of real part and imaginary part or amplitude and phase of Fourier transform of a sequence. With modern electric power industry developing rapidly, it is requested that reactive power is measured more accurately. In this paper, reactive power measurement theory, Hilbert phase-shifting algorithm and simulation and applications are expounded, then error contrast of reactive power algorithm based on sampling points phase-shifting and Hilbert are given. The data shows that Hilbert phase-shifting algorithm shifts phase and measure reactive power accurately, and it has been applied in the DSP unit for the multi-function electric energy meter.
出处
《电测与仪表》
北大核心
2009年第6期35-38,共4页
Electrical Measurement & Instrumentation
关键词
HILBERT变换
无功功率
电能计量
Hilbert transform, reactive power, electric energy measurement
