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Subject: search.filters.subject.Cascade Control

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    Developing HERMS Temperature Control: A Study on PID-P and PI-P Cascade Control
    (2025-01-01)
    Panaudomsup, Sumit
    ;
    Subhagandha, Thanachok
    ;
    Chanma, Kittidach
    ;
    Boksuwan, Sungwan
    The Heat Exchange Recirculating Mash System (HERMS) is widely utilized in craft brewing to maintain precise temperature control during the mashing process, which is critical for optimizing enzymatic activity and mash efficiency. This study explores the performance of two cascade control configurations: (1) a PID-P system, where an outer PID loop regulates an inner P loop, and (2) a PI-P system, where an outer PI loop regulates an inner P loop. The system was modeled using First-Order (FO) models, with control parameters optimized using Skogestad's tuning method. Simulations in MATLAB Simulink and real-world experimental validation were conducted to evaluate temperature stability, response time, energy efficiency, and wort quality. Results demonstrate that while both control strategies effectively maintain mash temperature, the PI-P configuration offers improved energy efficiency and reduced power fluctuations, making it more suitable for precision brewing applications. These findings contribute to optimizing HERMS temperature control, enhancing consistency, and reducing energy consumption in both home and industrial brewing setups.
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    A study of flow-level cascade control with WirelessHARTTM transmitter using LabVIEW
    (2017-12-13)
    Somkane, Pongsakorn
    ;
    Kongratana, V.
    ;
    Gulpanich, S.
    ;
    Tipsuwanporn, V.
    ;
    Wongvanich, N.
    This work presents a cascade control architecture to combat network induced delays in Wireless network controlled systems. Specifically a flow-level cascade control system is considered whereby the primary process variable is liquid level, and the secondary process variable is the flow rate. The flow-level process variables are measured by Wireless HART differential Pressure (DP) transmitter and sent through a WirelessHART gateway. Control actions are provided by a control valve actuator which is manipulated through a PLC. The PLC and the WirelessHART gateway are managed by an OPC server providing a medium of communication. The PID controller gains are designed through the LabView software, in which the network induced delays is offset by adjusting the controller interval until the responses are satisfactory. Results show that cascade control outperformed the single loop control, in both handling network induced delays and coping with disturbances.