Active Disturbance Rejection Control Design with Suppression of Sensor Noise Effects in Application to DC-DC Buck Power Converter

TL;DR

This paper introduces a cascade observer structure for ADRC that effectively suppresses sensor noise effects in DC-DC buck converters, improving control performance without noise over-amplification.

Contribution

A novel cascade ESO design for ADRC that reduces sensor noise impact and enhances control accuracy in power converters.

Findings

Effective noise suppression demonstrated in experiments

Improved estimation and control performance

Compatibility with low-pass filtering techniques

Abstract

The performance of active disturbance rejection control (ADRC) algorithms can be limited in practice by high-frequency measurement noise. In this work, this problem is addressed by transforming the high-gain extended state observer (ESO), which is the inherent element of ADRC, into a new cascade observer structure. Set of experiments, performed on a DC-DC buck power converter system, show that the new cascade ESO design, compared to the conventional approach, effectively suppresses the detrimental effect of sensor noise over-amplification while increasing the estimation/control performance. The proposed design is also analyzed with a low-pass filter at the converter output, which is a common technique for reducing measurement noise in industrial applications.