摘要
提出了一种基于GPS授时的电网频率测量的新方法,系统以GPS接收机提供的1PPS信号为基准源,结合GPS时钟信号和恒温晶振时钟信号精度互补这一特性,通过调控恒温晶振的压控端,使其输出频率随之改变,以维持短期和长期的时钟精度和稳定性。然后将此时钟提供给DSP的定时器,通过DSP的e CAP模块对输入信号的上升沿进行捕获,记录两个上升沿的触发时间得到电网的实时频率。
A new method of frequency measurement based on GPS timing grid was proposed. The 1 PPS signal source received from GPS was taken as datum fountain. Combined with the accuracy complementary feature of GPS clock signal and OCXO clock signal, through regulating the voltage-controlled of OCXO, output frequency change and maintaining clock short-term and long-term accuracy and stability were made. Then this clock would provide to DSP timer. Through e CAP module of DSP to capture the rise of input signal, the grid real-time frequency could be got by recording the triggering time of the two rising along.
出处
《电源技术》
CAS
CSCD
北大核心
2016年第3期709-710,714,共3页
Chinese Journal of Power Sources
基金
国家自然科学基金项目(51177099)
上海市科委基金(10160501700)
