Controlling the output voltage of the SEPIC converter using the second-order twisting sliding model controller

One of the most significant advantages of the SEPIC converter is its ability to function as a bidirectional converter, allowing for both step-up and step-down voltage conversion. The utilization of this converter in solar systems, fuel cells, power factor correction, and electric chokes represents only a limited selection of its numerous applications. Given the nonlinearity inherent in the operation of this converter, the author of this article suggests employing a second-order twisting sliding mode controller as a means to regulate the output voltage. The aforementioned controller possesses the functionalities of a first-order sliding mode controller while exhibiting enhanced precision and the capacity to mitigate saltiness and high-frequency fluctuations. The purpose of presenting these simulation results is to showcase the controller's capabilities in the voltage increase–decrease mode and when the system parameters are altered. During the final stage of the testing procedure, an assessment is conducted on both the step signal and the noise to verify the controller's ability to maintain speed and stability.