S7-200的中央空调控制系统的设计+流程图+原理图
关键词：中央空调；PLC；变频器；PID；4276
Central air-conditioning control system design based on S7-200
Abstract:Central air conditioning has been widely used in major shopping malls, office buildings and other places, the traditional control system is more appropriate in controlling the temperature at the same time, but it consumes a lot of energy. Today, there is growing emphasis on the comfort of central air conditioning and energy efficiency, this paper focuses on the central air-conditioning refrigeration pump unit control system for a comfortable living and working environment and provide an effective energy-saving technical conditions.This article first introduces the central air-conditioning working principle and structure, summed up the shortcomings of traditional central air conditioning, namely frozen pumps, cooling pumps can not be self-adjusting load, long run at full capacity, resulting in a great waste of energy, with increasing frequency technology mature, the use of inverter, PLC, digital to analog conversion module, temperature sensors and other devices combine to constitute a closed-loop temperature control system, automatically adjust the pump output flow to save energy. The system uses Siemens S7-200PLC as the main control unit, using traditional PID control algorithm, Siemens MM440 inverter control pump operation speed, to ensure that the system be adjusted according to the actual load flow, thermostatically controlled, at the same time can save a lot of energy.
Keywords :central air conditioning; PLC; converter; PID
目 录
第1章 绪论 8
1.1 论文背景 8
1.2 中央空调控制的研究现状及发展 9
1.2.1 中央空调控制系统的发展 9
1.2.2 中央空调变流量控制的发展 11
第2章 中央空调原理 11
2.1 中央空调系统的结构和原理 11
2.1.1 概述 11
2.1.2 制冷原理 12
2.1.3 中央空调系统的构成 12
2.2 变流量空调系统概述 12
2.3 变频空调控制流程图 14
第3章.理论推导 14
3.1 PID控制的设计 15
3.1.1 PID控制原理 15
3.1.2 PID控制器的参数整定 16
3.1.3 PID的反馈逻辑 16
3.1.4 P、I、D参数调整原则 17
3.2实现设定值的自动调节 17
3.3 PID控制器设计及实现 17
3.4 变频器的原理 18
3.5 本章小结 19
第4章 中央空调控制系统的硬件设计 19
4.1 西门子S7-200PLC 20
4.2 PLC简介 21
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