Improved Linear ADRC for Hybrid Energy Storage Microgrid Output-Side Converter

Abstract

As an effective application form for large-scale and efficient use of distributed power, microgrid not only realizes the flexible control of distributed power but also provides reliable power supply for the load. However, the power quality on the load side will be severely deteriorated when the microgrid is disturbed. To cope with this issue, an improve linear active disturbance rejection control (LADRC) technique is proposed in this article. In this technology, the idea of series correction is introduced into the disturbance observation channel of linear extended state observer. This strategy can achieve more accurate tracking of disturbance items through the correction link, and handle the unknown modeling error and external disturbances of the system as an overall disturbance through a single structure. Then, according to the linear feedback law to achieve good control of the output-side converter. Moreover, the traceability, convergence, and stability of ILADRC are analyzed. More importantly, guidance on parameters configuration is given on the basis of performance analysis. Finally, the validity of the proposed improved LADRC technique is verified on a 40-kW experiment platform.