The fractional-order proportional–integral–derivative (FOPID) controller has two more parameters than the integer-order proportional–integral–derivative (PID). Such characteristic makes the controller design more flexible and leads to superior performance. This study proposes a variable coefficient FOPID (VCFOPID) with optimal single step parameters, combining discrete synthesis and variable control parameters. The new algorithm is compared with previous FOPID discrete methods via several examples. Since the energy losses of the single-ended primary-inductor converter (SEPIC) cannot be ignored, the standard models are insufficient and a new model is derived using quantum-behaved particle swarm optimisation. The VCFOPID is applied to the SEPIC and both the effectiveness of the controller and the model are verified experimentally. ; The authors would like to thank the anonymous reviewers for their constructive comments, which greatly improved the quality of this paper. This work was supported by the National Natural Science Funds of China (nos. 61403115 and 11971032). ; info:eu-repo/semantics/publishedVersion


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    Title :

    Variable coefficient fractional‐order PID controller and its application to a SEPIC device


    Contributors:

    Publication date :

    2031-01-01


    Remarks:

    doi:10.1049/iet-cta.2019.0361



    Type of media :

    Article (Journal)


    Type of material :

    Electronic Resource


    Language :

    English



    Classification :

    DDC:    629




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