A novel dynamic integral sliding mode control for power electronic converters

Area of Science:

• Power Electronics
• Control Systems Engineering
• Electrical Engineering

Background:

• Sliding mode control (SMC) offers robustness and rapid response for power electronic converters.
• Variable switching frequency in conventional SMC leads to electromagnetic compatibility and power loss issues.

Purpose of the Study:

• To propose a dynamic integral sliding mode control (DISMC) strategy for power converters that operates at a fixed switching frequency.
• To address the drawbacks of conventional SMC, specifically concerning switching frequency variations.

Main Methods:

• Development of a novel dynamic integral sliding mode control algorithm.
• Implementation and testing on a dedicated hardware test rig with unregulated input voltage (12.5-22.5 V) and a 30 V output.
• Experimental validation under varying load conditions and input voltage uncertainties.

Main Results:

• The DISMC demonstrates excellent controller efficiency across a wide range of loads.
• The closed-loop system exhibits robustness against sudden load condition changes and uncertain input voltages.
• Significant improvements in rise time, settling time, and controller robustness compared to conventional controllers were observed.

Conclusions:

• The proposed dynamic integral sliding mode control effectively achieves fixed switching frequency in power converters.
• DISMC offers superior performance, efficiency, and robustness, overcoming limitations of traditional SMC methods.
• This technique is a viable solution for enhancing the performance and reliability of power electronic systems.