A Novel Filter Extracted Equivalent Control Based Fixed Frequency Sliding Mode Approach for Power Electronic Converters

Abdul Rehman Yasin, Muhammad Ashraf and Aamer Iqbal Bhatti
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Abdul Rehman Yasin: Department of Electrical Engineering, Capital University of Science and Technology (CUST), Islamabad Expressway, Kahuta Road, Zone-V, Islamabad 44000, Pakistan
Muhammad Ashraf: Department of Electrical Engineering, Capital University of Science and Technology (CUST), Islamabad Expressway, Kahuta Road, Zone-V, Islamabad 44000, Pakistan
Aamer Iqbal Bhatti: Department of Electrical Engineering, Capital University of Science and Technology (CUST), Islamabad Expressway, Kahuta Road, Zone-V, Islamabad 44000, Pakistan

Energies, 2019, vol. 12, issue 5, 1-14

Abstract: The key issue in the implementation of the Sliding Mode Control (SMC) in analogue circuits and power electronic converters is its variable switching frequency. The drifting frequency causes electromagnetic compatibility issues and also adversely affect the efficiency of the converter, because the proper size of the inductor and the capacitor depends upon the switching frequency. Pulse Width Modulation based SMC (PWM-SMC) offers the solution, however, it uses either boundary layer approach or employs pulse width modulation of the ideal equivalent control signal. The first technique compromises the performance within the boundary layer, while the latter may not possess properties like robustness and order reduction due to the absence of the discontinuous function. In this research, a novel approach to fix the switching frequency in SMC is proposed, that employs a low pass filter to extract the equivalent control from the discontinuous function, such that the performance and robustness remains intact. To benchmark the experimental observations, a comparison with existing double integral type PWM-SMC is also presented. The results confirm that an improvement of 20% in the rise time and 25.3% in the settling time is obtained. The voltage sag during step change in load is reduced to 42.86%, indicating the increase in the robustness. The experiments prove the hypothesis that a discontinuous function based fixed frequency SMC performs better in terms of disturbances rejection as compared to its counterpart based solely on ideal equivalent control.

Keywords: DC-DC converter; fixed frequency sliding mode control (SMC); pulse width modulation (PWM); filter extracted equivalent control (FEEC) (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2019
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (2)

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