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Metering pump flow control method based on networked generalized predictive control optimization

A generalized predictive control and flow control technology, applied in the field of metering pumps, can solve problems such as difficult to achieve high-performance control, prone to integral saturation, and weak robustness, and achieve good tracking performance and anti-interference performance. The effect of responsiveness

Inactive Publication Date: 2018-12-07
ZHEJIANG UNIV OF TECH
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Problems solved by technology

[0011] In order to solve the problem of difficult to achieve high-performance control due to the lack of robustness of the conventional PID algorithm in the flow control of material dosing by the metering pump in the sewage treatment process, which is prone to integral saturation

Method used

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  • Metering pump flow control method based on networked generalized predictive control optimization
  • Metering pump flow control method based on networked generalized predictive control optimization
  • Metering pump flow control method based on networked generalized predictive control optimization

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Embodiment Construction

[0044] The present invention will be further described below in conjunction with the accompanying drawings.

[0045] refer to Figure 1 ~ Figure 2 , the GPC control loop is introduced into the traditional single-loop feedback control system, combined with PID control to form a GPC-PID flow cascade control system, and a networked control method is adopted.

[0046] Taking the diaphragm metering pump as an example to analyze its system structure, it can be seen that the metering pump is driven by the motor, and the diaphragm is concave and convex through the reduction device and the transmission mechanism to form a pressure difference to realize the inflow and outflow of fluid. The entire metering pump system can be decomposed into the motor control system part and the flow output and detection control system part. The motor system is used as the inner loop control object, and the remaining parts form the outer loop control object.

[0047] The control mode of the inner loop sy...

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Abstract

The invention discloses a metering pump flow control method based on networked generalized predictive control optimization. According to the method, a GPC and a PID form a cascade control system for sewage treatment flow control. A primary loop employs generalized predictive control to carry out optimized controlling like model prediction, rolling optimization, and feedback correction; and a secondary loop employs PID controlling to realize precise adjustment of the rotating speed of a metering pump, so that output flow control is realized. The primary loop employs a networking controlling mode; and a GPC algorithm is implemented at a PC side and PC side and a lower computer carry out communication by using an ethernet network. A variable-structure adaptive anti-integral saturation PID control algorithm is put forward to eliminate a possible integral saturation phenomenon in an execution mechanism. According to the invention, because of the flow control technology with networking control, the operation efficiency of the GPC algorithm is improved; with the GPC-PID cascade control system, the flow control accuracy is improved; and the possible integral saturation phenomenon in the execution mechanism is avoided based on the adaptive anti-integration saturation algorithm.

Description

technical field [0001] The invention relates to the technical field of metering pumps, in particular to a metering pump flow control method based on a digital frequency conversion controller. Background technique [0002] Industrial fluid dosing metering pumps are widely used in pharmaceutical, petroleum, chemical, water treatment and other fields, where quantitative dosing of materials is required. For example: drug delivery in the pharmaceutical industry. Generally, a pump set is composed of multiple metering pumps. Each pump set accurately transports and mixes chemicals according to production requirements, and needs to achieve accurate flow delivery. In the chemical process, adding strong base and strong acid preparations to adjust and control the pH of the reaction chamber requires the dosage of the preparations to be controlled within a certain range. [0003] At present, there are three main flow control methods for metering pumps: [0004] 1 handwheel manual adjus...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G05B19/418
CPCG05B19/41885G05B2219/32339Y02P90/02
Inventor 余世明潘雄平何德峰仇翔吴根忠宋秀兰俞立
Owner ZHEJIANG UNIV OF TECH
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