利用模糊控制理论设计合理的切泵逻辑，实现了平稳切换。
Rational switching logic of pumps is designed with fuzzy control theory, and stable switching is implemented.
同时利用同步切换控制实现水泵由变频电源向工频电源的平稳切换。
Moreover, synchronous switch is applied to the system in order to complete the smooth switch on condition that frequency and phase of inverter power and power supply are the same.
现场工业试验成功地实现了大功率电机变频到工频的平稳切换，切换电流大大减小。
In the industry test is realized to successfully complete the switch from VF to WF, the switch current greatly decrease.
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