Research on Linear Active Disturbance Rejection Control in DC/DC Boost Converter

Hui Li,Junwei Lu,Xinxiu Liu

doi:10.3390/electronics8111249

Abstract

This paper proposes a cascade control strategy based on linear active disturbance rejection control (LADRC) for a boost DC/DC converter. It solves the problem that the output voltage of boost converter is unstable due to non-minimum phase characteristics, input voltage and load variation. Firstly, the average state space model of boost converter is established. Secondly, a new output variable is selected, and a cascade control is adopted to solve the problems of narrow bandwidth and poor dynamic performance caused by non-minimum phase. LADRC is used to estimate and compensate the fluctuations of input voltage and loads in time. Linear state error feedback (LSEF) is used to achieve smaller errors than traditional control method, which ensures the stability and robustness of the system under internal uncertainty and external disturbance. Subsequently, the stability of the system is determined by frequency domain analysis. Finally, the feasibility and superiority of the proposed strategy is verified by simulation and hardware experiment.

Highlights

With the vigorous promotion of renewable energy such as photovoltaics and wind turbines, the DC microgrid has received extensive attention [1,2,3]
The output voltage controlled at 24 Vofand a 50 boost
The current of the current loop is taken as a new output

Summary

Introduction

With the vigorous promotion of renewable energy such as photovoltaics and wind turbines, the DC microgrid has received extensive attention [1,2,3]. Compared with the AC microgrid, the DC microgrid has the advantages of high efficiency and simple control structure [4]. The DC microgrid avoids some of the problems in the AC microgrid. Reactive power flow, harmonic current, and synchronization [5]. The DC microgrid will become the main power architecture for buildings, parks, and power electronic loads. The instability of the output voltage will cause some problems, including protection device malfunction and damage to the electrical equipment, so it is important to ensure the stability of the DC output voltage

Methods

Results

Conclusion