【摘要】 文中介绍了牵引供电系统实时测量中的关键技术———交流采样。针对牵引供电系统的特殊性 ,为实现交流采样高精度实时测量 ,本文研究谐波和三相负荷严重的不平衡工况下的无功功率的算法 ,同时对频率的测量算法进行了研究 ,硬件上采用锁相倍频技术 ,实现采样频率对工频频率的在线自动跟踪。更多还原

【Abstract】 This paper introduces a key technique for electric power supplied traction system-AC Sampling. According to the peculiarity of the electric power supplied traction system, this articlediscusses the algorithms of reactive power with nonsinusoidal waveforms and unbalanced loads. Then evaluates the frequency tracking methods and gives two high performance methods in details.In order to track fundamental frequency automatically , phase locking frequency multiplier can be used in hardware.更多还原