Method for automatically controlling constant temperature and humidity air-conditioning system

Abstract

By adopting the method of combining mechanism analysis with experimental analysis, the invention establishes a mathematical model of a constant temperature and humidity air-conditioning system, deduces a four-output and four-input transfer function matrix, and designs a decoupling compensator by adopting the feedforward compensation method so that the transfer function matrix of the constant temperature and humidity air-conditioning system can be converted into a diagonal matrix, thereby getting rid of the coupling among control loops and carrying out verification through emulation. Results indicate that the application effect of the decoupling controller in the constant temperature and humidity air-conditioning system is better, and the quality and the performance of the system are improved and increased.

Description

technical field [0001] The invention relates to a control method of an air conditioning system, in particular to a decoupling control method for a control loop in which multiple control parameters of a constant temperature and humidity air conditioner are coupled to each other. Background technique [0002] Since the constant temperature and humidity air conditioning control system has the characteristics of multi-variable, nonlinear, and large time-delay, in many engineering cases, each control loop is controlled separately. [0003] figure 1 It is the control schematic diagram of the constant temperature and humidity air-conditioning room. The control system consists of temperature, humidity and pressure sensors, variable air volume controller, fan inverter, humidification device and its regulating valve, surface cooler and its regulating valve, new return air regulating valve, and on-site DDC controller. There are 4 control loops, which are air supply temperature contro...

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Problems solved by technology

[0014] According to the above control principle, it is normal for each loop to operate independently, but if all loops work at the same time, the whole system will be unstable.

This is due to the mutual coupling, mutual influence and mutual interference between the various control loops of the air conditioning system. It is obviously extremely unreasonable to design these loops as if they are not connected to each other.

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