An internal model decoupling control method and control system for a variable air volume air conditioner

Abstract

Belonging to the technical field of air conditioner control, the invention discloses an internal model decoupling control method and control system of a variable air volume air conditioner. The methodincludes: building a three-input three-output model adopting air volume, cold supply water flow and fan rotating speed as the input variables and taking room temperature, supply air temperature and static pressure as the output variables; constructing an internal model control structure; and constructing a decoupling network model, which adopts a multiple-input multiple-output internal model decoupling control method for decoupling, and realizes single-input single-output control of the air volume-room temperature, chilled water flow-supply air temperature and draught fan rotating speed-static pressure. According to the invention, internal model decoupling control is adopted to weaken the coupling performance of the control loop with strong coupling performance, namely the air volume-roomtemperature, chilled water temperature-supply air temperature and fan rotating speed-static pressure, to negligible, and when any control variable changes, the influence caused by the coupling loop can be negligible, and the overall stability and robustness of the variable-air volume air conditioning system are improved.

Description

technical field [0001] The invention belongs to the technical field of air conditioning control, and in particular relates to an internal model decoupling control method and a control system of a variable air volume air conditioner. Background technique [0002] Currently, the closest prior art: [0003] Due to its advantages of comfort, energy saving, low noise, and easy retrofitting, variable air volume air conditioners (VAV) have attracted much attention in various fields such as civil and industrial, and are widely used in various large-scale intelligent buildings. Although the variable air volume air conditioner has the above advantages, the VAV system is a multivariable, strongly coupled system with time lag, which makes it difficult to precisely control the variable air volume air conditioner. When the loops work together, the strong coupling between parameters makes it difficult for the control system of the VAV air conditioner to reach a stable state, so it is of p...

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Problems solved by technology

[0008] (1) The prior art variable air volume air conditioning system cannot eliminate the coupling between the room temperature, supply air temperature, and static pressure control loops, resulting in strong coupling instability of each loop and affecting the normal operation of the air conditioner

[0009] (2) The existing variable air volume air conditioning system does not combine internal model control, resulting in poor robustness and dynamic performance of the control system in control

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