Title: Delay-based droop control in DC-DC converters: a novel technique to overcome the DC microgrid stability problems with constant power loads

Authors: P. Balakumar; T. Vinopraba; Geetha Chandrasekaran; S. Sankar

Addresses: School of Electrical Engineering, Vellore Institute of Technology, Chennai Campus, India ' Department of Electrical and Electronics Engineering, National Institute of Technology Puducherry Karaikal, Puducherry, India ' Department of Electrical and Electronics Engineering, National Institute of Technology Puducherry Karaikal, Puducherry, India ' Department of Electrical and Electronics Engineering, National Institute of Technology Puducherry Karaikal, Puducherry, India

Abstract: With the development of distributed renewable energy sources (DREs), DC microgrids are gaining popularity because of their high efficiency, reliability, and ease of connecting DREs. The negative incremental impedance caused by connecting multiple constant power loads (CPLs) at the DC microgrid generates voltage oscillations. To eliminate the effect of CPLs, a technique is proposed to suppress the oscillations created by the disturbance in the DC bus. In this paper, a delay-based control technique has been developed at the source side controller. The proposed approach is integrated with the existing maximum power point tracking (MPPT) algorithm with a droop controller to suppress the oscillations at the DC bus. This approach enhances the power quality of the multiple CPLs connected in the DC microgrid.

Keywords: constant power loads; distributed renewable energy sources; DC microgrid; MPPT with droop control; modelling of cascaded converter.

DOI: 10.1504/IJPELEC.2024.137827

International Journal of Power Electronics, 2024 Vol.19 No.3/4, pp.246 - 260

Received: 04 Feb 2023
Accepted: 14 Jul 2023
Published online: 05 Apr 2024 *

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