Adaptive terminal sliding-mode control strategy for DC-DC buck converters

Area of Science:

• Electrical Engineering
• Control Systems
• Power Electronics

Background:

• DC-DC buck converters are crucial for voltage regulation.
• Conventional sliding mode control (SMC) and terminal sliding mode control (TSMC) have limitations in dynamic load conditions.
• Output voltage stability and fast response are critical for converter performance.

Purpose of the Study:

• To develop an Adaptive Terminal Sliding Mode Control (ATSMC) strategy for DC-DC buck converters.
• To achieve finite-time convergence of output voltage error.
• To enhance dynamic response during load variations using an adaptive law.

Main Methods:

• Implementation of a terminal sliding mode control (TSMC) approach.
• Integration of an adaptive law to create the ATSMC strategy.
• Analysis of controller parameter influence (fractional power) on system performance.
• Validation through computer simulations and experimental testing.

Main Results:

• ATSMC ensures finite-time convergence of output voltage error.
• Faster startup response observed with increased fractional power in the sliding function.
• Faster transient response to load changes with decreased fractional power.
• ATSMC demonstrates superior performance compared to conventional SMC and TSMC during load variations.

Conclusions:

• The proposed ATSMC strategy offers significant improvements in DC-DC buck converter performance.
• A trade-off exists between startup and transient response, requiring careful selection of the fractional power parameter.
• ATSMC provides a robust and efficient control solution for dynamic power electronic systems.