摘要
针对变频恒压供水系统中水泵电机由变频电源供电向工频电源供电切换时,由于水泵电机断电后的电动势与工频电源相位差的不确定性,可能产生的过电流问题进行了锁相环同步切换控制的研究。
In variable-frequency constant-pressure system of water supply, the problem of excessive current may be generated when the system controls the pumps to get power from variable frequency equipment changing to the electricity network, and due to the phenomenon caused by the uncertain phase relationships between back electromotive force of the pmnp and the power supply. This paper discusses the synchronous switch control based on digital PLL （Phase Lock Loop） to solve the problem.
出处
《电子设计工程》
2012年第22期151-153,共3页
Electronic Design Engineering
基金
陕西工业职业技术学院2011年院级科研课题(ZK11-09)
关键词
变频调速
恒压供水
锁相环
同步切换
frequency control
constant pressure water supply
phase-locked loop
loop
simultaneous switching
