一、前言近几年，在国内各城市已开始推广使用微机自动给水设备，这种给水设备几乎都是采用变频调速的方式来实现恒压供水的，它取消了旧式供水设备的高位水箱和气压罐等，可以称之为第三代给水设备。它的优点是供水管网设计施工简便容易，供水压力稳定。但由于其中的变频... I. INTRODUCTION In recent years, the use of microcomputer-based automatic water supply equipment has been promoted in various cities in China. This type of water supply equipment almost always adopts variable frequency speed regulation to realize constant pressure water supply. It has eliminated the high level water tank of old water supply equipment and Pressure tanks, etc., can be called third-generation water supply equipment. Its advantages are simple and easy design and construction of water supply network, and stable water supply pressure. But because of the frequency conversion...