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PLC based expert rule PID constant-pressure water supply system and method

A constant pressure water supply, regular technology, applied in the water supply pipeline system, water supply device, water supply main pipeline, etc., to achieve the effect of improving rapidity and improving stability

Inactive Publication Date: 2019-09-20
XUZHOU NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The purpose of the present invention is to provide a new control strategy to change the defect that traditional PID parameters cannot be self-tuned and self-adapted online, and to reduce energy consumption while improving the stability and automation of the control system

Method used

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  • PLC based expert rule PID constant-pressure water supply system and method
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  • PLC based expert rule PID constant-pressure water supply system and method

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Embodiment

[0033] like figure 1 As shown, a PLC-based expert rule PID constant pressure water supply system, the system is composed of water pumps, frequency converters and PLC, etc., to adjust the speed of the water pump unit and change the number of operating water pumps. The pressure sensor mainly detects the water outlet pressure of the water pump, and then transmits the data to the PLC for feedback comparison with the set water pressure value. After the PLC calls the expert rule PID subroutine to set and calculate the three PID parameters, the CPU sends a control signal to adjust the pump motor speed and control the number of water pumps to stabilize the water pump outlet pressure near the given pressure.

[0034] By improving traditional PID and adding expert rule base to traditional PID, it can perform adaptive self-tuning online. Make it quickly track the water pressure parameter setting value by changing the frequency of the asynchronous motor of the water pump to control the w...

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PUM

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Abstract

The invention discloses a PLC based expert rule PID constant-pressure water supply system and method. The system consists of water pumps, frequency converters, a PLC and the like, wherein pressure sensors are mainly used for detecting pressure of water outlets of the water pumps, and then transmitting data to the PLC to perform feedback control with a set water pressure value. After computing processing is performed in the PLC, a CPU emits a control signal to regulate rotation speed of motors of the water pumps and to control number of the water pumps, so that pressure of the water outlets of the water pumps is stabilized near given pressure. According to the control system and method disclosed by the invention, conventional PID is improved, and an expert rule base is added into the conventional PID, so that the conventional PID can be self-tuned in a self-adaptive mode online. The PLC based expert rule PID constant-pressure water supply system quickly tracks a water pressure parameter set value, and controls water amount by changing frequency of an asynchronous motor of a water pump, so that water supply pressure is controlled, and automatic control of the water supply system is realized. The system can realize PID parameter self-adaption, improves stability of the water supply system, can perform parameter online self-tuning, and facilities improving quickness of the water supply system.

Description

technical field [0001] The invention relates to automatic control, in particular to a PLC-based expert rule PID constant pressure water supply system and method. Background technique [0002] In our country, due to the structure of the city and the management of the city, the water source for residents' life or the water required for factory production is provided by the water supply network of the water company. However, due to technical limitations, the water pressure of the water supply can only reach 0.35-0.4Mpa, which can only provide water supply for users living below the eighth floor. With the strides forward in national construction, the construction of high-rise buildings in cities continues to increase, and the water supply pressure provided by the current water supply system can no longer meet the water supply and fire water supply requirements of high-rise buildings. Moreover, the equipment in the control part of the water supply system in small and medium-size...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F04B23/04F04B49/06E03B7/07E03B11/16E03B11/10
CPCE03B7/07E03B11/10F04B23/04F04B49/065
Inventor 邓斌夏正龙张鹏
Owner XUZHOU NORMAL UNIVERSITY
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