Research on Decoupling Control of Variable Air Volume Air Conditioning Based on Subspace
The variable air volume air conditioning system has multiple control loops,and the loops are coupled with each other.The system model parameters may change due to factors such as external environment and operating conditions.A data-driven subspace decoupling control strategy is proposed to address the characteristics of multi loop,long time delay,and uncertainty in the control of variable air volume air conditioning systems.This control strategy uses subspace identification method to identify the system state space model online,calculate and update the decoupler parameters and establish a subspace model.By combining the subspace description of the controlled object output and the relationship between the controller parameters,performance indicators are constructed to complete the online parameter tuning of PID controller parameters.Simulation analysis was conducted on the coupling circuits of water flow rate,air temperature,and air flow rate,static pressure.The results showed that the subspace decoupling control method effectively eliminated the coupling effect between the circuits and improved the stability and response speed of the control system.
variable air volume air conditioningPID controllersubspacedecoupling control
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