摘要
介绍了基于直接数字式频率合成DDS(DirectDigitalSynthesis)技术的工频频率滑差源的研制。该滑差源具有df/dt频率滑差功能,主要用于继电保护频率滑差试验仪的核心部件数字调幅调相滑频电压源。简述了频率滑差的原理,重点叙述了适应于频率滑差输出的软件算法,以及相位累加器、数字波形的合成、数字移相和输出波形的程控调幅等环节的设计思想。
A power frequency slip source based on DDS(Direct Digital Synthesis)technology is de-veloped. With the function of d f/ d t slip,it is mainly used in the relay protection test instrument as its digital amplitude and phase modulated voltatge source. The principle of frequency slip is intro-duced briefly. The software algorithm for frequency slip output and the design ideas of phase accumulator,digital wave composition,digital phase shift,and programmable amplitude modulation of output wave are emphasized.
出处
《电力自动化设备》
EI
CSCD
北大核心
2005年第1期72-74,78,共4页
Electric Power Automation Equipment
