Phase-locked loop synchronous switching and FNN intelligent variable frequency constant pressure water supply system

Abstract

The invention discloses a phase-locked loop synchronous switching and fuzzy neural network (FNN) intelligent variable frequency constant pressure water supply system. The system has the following working steps that: 1, a controller acquires an actual water pressure value of a water pressure acquisition device; 2, the controller compares the actual water pressure value acquired in the step 1 with the set water pressure value of the system; and 3, when the comparison in the step 2 has difference, the revolution speed of each asynchronous motor is controlled through a self-adjusting FNN module and a neural network self-setting module. Variable frequency control is performed on each asynchronous motor by using a phase-locked loop technology, and the neural network self-setting module can simultaneously regulate multiple proportion integration differentiation (PID) parameters on line. The interference influence of factors such as nonlinearity, time variation and the like in the constant pressure water supply system is overcome, the robustness of the constant pressure water supply system is enhanced, the steady state error of the system is eliminated, the problem of instable water pressure at a user side is well solved, and reliability and stability of the system are ensured.

Description

technical field [0001] The invention relates to the technical field of water supply, in particular to an intelligent variable frequency speed regulation constant pressure water supply system. Background technique [0002] In the field of water supply technology, when the demand for water supply changes greatly, it is necessary to ensure the constant water pressure in the water pipe network. In order to meet this technical requirement, in medium and large-capacity water supply systems, the technical solution of providing pressure closed-loop adjustment outside the frequency converter is generally adopted; at the same time, external logic control can also be provided for the circulation control of multiple water pumps; When switching the frequency power supply, the main circuit is connected in series with the soft starter to start the technical means; through the comprehensive use of the above methods, the technical purpose of frequency conversion and constant pressure water s...

AI Technical Summary

Problems solved by technology

The inverter integrates the pressure closed-loop adjustment and loop logic control functions inside the inverter, and its output interface limits the capacity with load, so it is only suitable for small and medium-capacity systems

[0011] At present, in the research of variable frequency speed regulation constant pressure water supply control system at home and abroad, there is no good solution to the problems of water pressure closed-loop control and non-disturbance smooth switching between variable frequency power supply and commercial frequency power supply in medium and large capacity constant pressure water supply systems. Program