Integral sliding mode based direct power control of isolated DC‐DC converter for improved voltage regulation

Abstract

This article presents an isolated bidirectional DC‐DC dual active bridge (DAB) converter with an integral sliding mode‐based direct power control (SM‐DPC). Maintaining the dc‐link stability and obtaining a robust control for the converter during sudden load change is a significant challenge. The sliding mode control is well known for its robustness, stability, and tracking performance. The sliding surface based on output voltage error is selected, while the proposed method utilizes the equivalent control approach to generate the power reference for the DAB converter. The direct power control provides an easy control method for the DAB converter as the output voltage depends on the transmitted power, governed by the phase shift angle of two H‐bridges of the converter. The proposed method enhances the steady‐state performance and renders a fast transient response under load change and input voltage variation. Moreover, the method avoids complicated converter modeling and utilizes the voltage dynamic equation and power transfer equation for the controller design. The controller performance and effectiveness are validated with experimental results for a 2‐kW DAB converter.

Optimization Strategy for Output Voltage of CCM Flyback Converter Based on Linear Active Disturbance Rejection Control

“…The control methods in references [34,35] are similar, both based on a one degree of freedom PID controller and utilizing intelligent algorithms for parameter optimization. Reference [36] uses fuzzy control, which is also an intelligent algorithm that requires two sensors for measurement. Compared to these three types of control, the control proposed in this study is an algorithm for offline adjustment of controller parameters.…”