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Vol. 154, Issue 7, July 2013, pp. 201-208




Variable Frequency Water Intaking Fuzzy PID Control System
1, 2 Xiaohui Mo and 1 Yi Zhang

1 Department of Information Technology, Jinling Institute of Technology, No. 99, Hongjing Ave., Jiangning Dist., Nanjing 211169, China 2 School of Automation, Southeast University, No. 2, Sipailou, Nanjing 210096, China

1 Tel.: 8625-86188966, fax: 8625-86188987

1 E-mail: mxh@jit.edu.cn, zhangyi@jit.edu.cn


Received: 28 April 2013   /Accepted: 19 July 2013   /Published: 31 July 2013

Digital Sensors and Sensor Sysstems


Abstract: The water intaking system of a water works usually controlled the rotation rate of water pumps manually according to experiences, with low accuracy rate and poor energy-saving effect in the past. Combining with the system status, this paper brings forward constructing a variable frequency water intaking control system with PLC and inverter as the core, and by means of fuzzy PID control. During operation of the system, PLC will get the standard inlet flow required for the clean water tank through PID operation according to the difference between the set water level and actual water level of the clean water tank. Then, PLC will compare the standard inlet flow and actual inlet flow of the clean water tank, output control signals through fuzzy PID operation, control the working frequency of inverter, and then control the rotation rate of water pump, adjust the inlet flow of clean water tank, and realize stable liquid level of clean water tank in water supply workshop. The operation and experiment demonstrates that the system make the work of water intaking automated in some degree. It is good for energy saving and improving the management of water works.


Keywords: Automatic water intaking system, Water pumps, PLC, Inverter, Fuzzy PID control.


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