期刊
JOURNAL OF CONTROL AUTOMATION AND ELECTRICAL SYSTEMS
卷 32, 期 1, 页码 30-41出版社
SPRINGER
DOI: 10.1007/s40313-020-00644-2
关键词
Fractional calculus; IMC; ABC algorithm; Series cascade control; Dead-time compensator; Unstable processes
In this study, an advanced dead-time compensator-based series cascade control structure is proposed for unstable processes, utilizing fractional order-based internal model control approach. The design of controllers is optimized using constrained artificial bee colony algorithm, with simulation studies conducted to illustrate the advantages of the proposed strategy.
In industrial unstable processes, disturbance rejection is more challenging task than setpoint tracking. So, cascade control structure is widely used in many chemical processes to reject disturbances. In this work, an advanced dead-time compensator-based series cascade control structure (SCCS) is suggested for unstable processes. The suggested SCCS has three controllers (named as primary, secondary and stabilizing controllers). Both primary and secondary controllers are designed using fractional order-based internal model control (IMC) approach. The stabilizing proportional-derivative controller is designed using maximum sensitivity considerations and Routh-Hurwitz stability criteria. Optimal values of the closed-loop time constants and fractional orders of IMC filters are obtained using constrained artificial bee colony (ABC) algorithm. This ABC algorithm uses a multi-objective function involving minimization of integral of absolute error, integral of time weighted absolute error and integral of squared error. Simulation studies are conducted using some benchmark plant models used in literature for illustrating the advantages of the proposed strategy compared to the state of the art. Moreover, robust stability of the proposed design is analysed and quantitative performance measures are also computed.
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