Fuzzy adaptive central air-conditioning cooling water energy-saving control system and fuzzy adaptive method thereof

Abstract

The invention provides a fuzzy adaptive central air-conditioning cooling water energy-saving control system and a fuzzy adaptive method thereof. The system comprises an industrial control computer, a programmable logic controller (PLC), an analog input module, an analog output module, a digital input module, a digital output module, a frequency converter, first and second platinum resistance temperature sensors, a cooling fan and a cooling water pump, wherein the first and second platinum resistance temperature sensors acquire the temperature signals of cooling supply and return water in real time; the signal is transmitted to the PLC and then to the industrial control computer; and the industrial control computer obtains the proportion and integral controller parameters in a cooling water pump and cooling fan control circuit through real-time computation according to the computer programs and ensures the parameters to automatically adapt to variation of the working conditions of the central air-conditioning system. The invention solves the problems of higher energy consumption and poor control performance in the operation processes of the traditional central air-conditioning cooling water systems and ensures the central air-conditioning cooling water system to operate efficiently and stably under partial load operation conditions.

Description

technical field [0001] The invention relates to a central air-conditioning cooling water energy-saving control system based on fuzzy self-adaptation and a fuzzy self-adaptive method thereof, belonging to the field of air-conditioning control. Background technique [0002] The central air-conditioning cooling water system is used to ensure the energy efficiency ratio of the normal operation of the air-conditioning host, and the energy saving of the cooling water system is an important way to save energy in the central air-conditioning system. The traditional central air-conditioning cooling water system is a constant-flow supply system. Once the air-conditioning host is started, the system’s cooling water pump and cooling tower fan are always fully loaded regardless of the air-conditioning load. In this form, the actuator usually used to control the outlet water temperature of the cooling tower is a valve, which does not substantially reduce the flow of cooling water, but als...

AI Technical Summary

Problems solved by technology

At present, proportional and integral (PI) controllers are widely used in central air-conditioning systems to regulate and control the operation of each sub-circulation system. The experience and sense of responsibility of engineering commissioning personnel are greatly influenced by human factors, and once the parameters are set, if they are not adjusted by humans, they will remain fixed and cannot be automatically adjusted with changes in the operating status of the air conditioning system, and it is impossible to realize on-site self-control. adjust

This proportional and integral (PI) control with fixed parameters is used to control the central air-conditioning cooling water system with complex dynamic characteristics, which not only has poor energy saving effect, but also easily causes oscillation and poor control performance.

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