基于模糊理论的中央空调冷水机组节能控制方法

Energy saving control method for central air conditioning chillers units based on fuzzy theory

中央空调系统的能耗设备主要为制冷机组、水泵、风机。其中,制冷机组是整个系统中能耗最大的设备,因此,对制冷机组进行节能控制具有重要意义。但传统的恒温节能控制和时间节能控制方法往往无法根据环境温度的变化或负载变化进行智能调控,为此,设计基于模糊理论的中央空调冷水机组节能控制方法。设计二维结构的自适应模糊PID节能控制器,定义输入和输出变量的词集,建立模糊PID节能控制器的控制规则,对进入控制器的两个采样输入量实施模糊化处理,输出模糊化处理结果,以温度误差和误差变化作为输入变量,以调整中央空调冷水机组的输出量为最终输出量,对中央空调冷水机组进行节能控制。结果表明,该方法的温度误差仅为0.2℃,湿度误差仅为0.4%,投入后年总耗电量有效降低,具有较好的温度均匀控制效果,对于阶跃扰动响应的反应速度更快。

The energy consuming equipment of the central air conditioning system mainly includes refrigeration units,water pumps,and fans.Among them,the refrigeration unit is the equipment with the highest energy consumption in the entire system,therefore,energy⁃saving control of the refrigeration unit is of great significance.However,traditional constant temperature energy⁃saving control and time energy⁃saving control methods often cannot intelligently regulate based on changes in environmental temperature or load.Therefore,a energy⁃saving control method for central air conditioning chillers based on fuzzy theory is designed.Design an adaptive fuzzy PID energy⁃saving controller with a two⁃dimensional structure,define the word set of input and output variables,establish the control rules of the fuzzy PID energy⁃saving controller,implement fuzzification on the two sampled inputs entering the controller,output the fuzzification results,use temperature error and error change as input variables,adjust the output of the central air conditioning chiller as the final output,and carry out energy⁃saving control on the central air conditioning chiller.The results show that the temperature error of this method is only 0.2℃,and the humidity error is only 0.4%.After being put into use,the total annual power consumption is effectively reduced,and it has a good temperature uniform control effect.The response speed to step disturbances is faster.