文章介绍了等精度测频方法和传统测频方法的原理并进行了误差分析,提出了应用等精度测频方法测量机组转速,给出了基于此方法进行机组转速测量的软、硬件实现,并进行了系统测试,试验结果表明,该系统具有测量精度高,抗干扰能力强等优点,适合在电力自动化测控系统中应用。 This paper introduces the principles of equal precision frequency measurement method and traditional frequency measurement method and carries out error analysis. It puts forward the application of equal precision frequency measurement method to measure unit speed, and gives the software and hardware implementation of unit speed measurement based on this method. The system test is carried out. The test results show that the system has the advantages of high measurement accuracy and strong anti-interference ability, and is suitable for the application in the automatic measurement and control system of electric power.