Refrigeration house temperature feedforward-fuzzy control system based on dynamic load variation and control method

Abstract

The invention discloses a central air conditioning fuzzy PID control system based on load prediction control. The system comprises a load prediction module, a fuzzy PID control module, an executor, acontrolled object and a sensor. The load prediction module is composed of three load prediction units including the medium-term load prediction unit, the short-term load prediction unit and the flow prediction unit. A load prediction controller calculates the required chilled water flow of a current chilled water system according to history operating data and an outdoor temperature, then the required frequency of a chilled water pump is calculated by means of the intelligent fuzzy PID control system, finally, the rotating speed of the water pump is changed through a water pump frequency changer, variable flow control of central air conditioning chilled water is completed, and therefore, the system has the energy-saving benefit. By means of the refrigeration house temperature feedforward-fuzzy control system based on dynamic load variation and the control method, the phenomena that temperature control through a traditional central air conditioning system chilled water control scheme lags, and the control precision is not high are avoided, early response of a flow control system is achieved, and the performance of a central air conditioning system is guaranteed.

Description

technical field [0001] The invention relates to a central air-conditioning control technology, in particular to a fuzzy PID control system for central air-conditioning chilled water based on load forecasting. Background technique [0002] With the further advancement of my country's urbanization, my country's total energy consumption is also showing a trend of increasing year by year. According to current relevant surveys, my country's building energy consumption accounts for 30% of the total energy consumption, while the energy consumption of public buildings is 5-15 times of residential energy consumption. In addition, compared with residential buildings, the energy consumption of central air-conditioning systems in public buildings accounts for 45-70% of the total energy consumption. Building energy consumption has begun to restrict the development of my country's economy. Therefore, taking corresponding energy-saving measures for building central air-conditioning systems...

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Problems solved by technology

[0006] The technical problem to be solved by the present invention is to provide a fuzzy PID control system for central air-conditioning chilled water based on load forecasting to overcome several problems in the existing central air-conditioning chilled water control system for the above-mentioned deficiencies in the prior art: One is that the traditional control system cannot predict in advance the size of the building's required load at the next moment, and fails to take the actual cooling capacity of the user into consideration; the other is to solve the problem of poor accuracy and control problems in the application of traditional PID to air conditioning system control. hysteresis

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