An adaptive disturbance rejection control scheme for voltage regulation in DC micro-grids

Abstract

Trabajo presentado en la 20th IEEE International Conference on Industrial Technology, celebrada en Melbourne (Australia) del 13 al 15 de febrero de 2019 ; Uncertain generation by renewable sources and load variations have resulted in adding energy storage systems in the grid to maintain grid parameters (voltage, frequency) within prescribed limits. The disturbances being non-deterministic in nature, the voltage regulation control by the storage systems relies mostly on dual loop architecture with an outer voltage and inner current loop. Improvement in controller dynamics can be achieved through feed forward of disturbance profile but at expense of additional sensors and communication in the grid. This work explores the application of an adaptive disturbance rejection control scheme for disturbance estimation (without using additional sensors) employing an extended state and proportional integral observer (PI+ESO). The proposed observer aim to achieve robust disturbance estimation under grid parameter uncertainty. The effectiveness of the proposed scheme over the conventional one will be put forward through H¿ and H2 norm analysis of the system. The design and simulation results of the proposed scheme will be presented in this work. ; This work is done as part of project which has received funding from the European Union's Horizon 2020 research and innovation programme under the Marie Skłodowska Curie grant agreement No 675318 (INCITE). This work has been partially funded by the MINECO/FEDER project DPI2015-69286-C3-2-R. This work is supported by the Spanish State Research Agency through the Mara de Maeztu Seal of Excellence to IRI (MDM-2016-0656). This work is partially funded by AGAUR of Generalitat de Catalunya through the Advanced Control Systems (SAC) group grant (2017 SGR 482)