Abstract
For non-square multivariable system, a design method of fractional order Smith predictor controller was proposed. Firstly, the structures of multivariable decoupling Smith predictor control and equivalent internal model control (IMC) were introduced. Then, the decoupler was deduced to achieve non-square system decoupling, and the model of decoupled system could be expressed as a square diagonal matrix. Considering the complexity of decoupled model, the particle swarm optimization (PSO) algorithm was used to reduce the high order model to the first order plus time delays (FOPTD) model. Finally, based on the IMC principle, a fractional order controller was designed, and the controller parameters were tuned by using the dominant pole placement method. The simulation results show that the proposed method is simple, and can provide a better dynamic performance and robustness.
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