Robust Flatness-Based Control With Nonlinear Observer for Boost Converters
Zohreh Shahrouei, Mahsa Rahmati, Roghayeh Gavagsaz‐Ghoachani, Matheepot Phattanasak, Jean‐Philippe Martin, Serge Pierfederici
Abstract
DC–DC boost converters are widely used in different applications, such as electric transportation systems and telecommunications. A robust controller is required due to boost converter nonlinear behavior. Reducing the number of sensors in the control system is important. It leads to a lower cost system. This article presents sensorless flatness-based control and a nonlinear observer for a boost converter. Practically, it is difficult to build an exact mathematical model. Thus, online estimators are applied to estimate the modeling error and build a more realistic model. In addition, the output current and input voltage are estimated by the observer. As a result, the sensors of these two parameters are removed. The proposed controller is robust to variations in the input voltage and load resistance. A one-loop structure is implemented for the proposed controller to control the input current and output voltage. Because of the one-loop structure properties, high dynamical performance can be achieved. A reduced number of sensors and a high-bandwidth controlled system are the main contributions of this article. Simulation and experimental results are presented to confirm the effectiveness of the proposed control method.