Controlling DC microgrids in communities, buildings and data centers. Issue 3 (15th May 2020)

• Record Type: Journal Article
• Authors: Kolluri, Ramachandra Rao; Mareels, Iven; de Hoog, Julian
• Is Part Of: IET smart grid. Volume 3:Issue 3(2020)
• Page Start: 376
• Page End: 384
• Publication Date: 2020-05-15
• Subjects: eigenvalues and eigenfunctions -- quality control -- voltage control -- power generation control -- distributed power generation -- computer centres; voltage stability -- current power‐sharing -- DC voltage droop control -- communication‐based consensus control -- primary voltage droop control loop -- current sharing performance -- voltage deviation -- voltage quality control -- low latency communication‐based control technique -- proportional current sharing -- DC microgrids -- data centers -- developing countries -- renewable energy -- master‐less control strategy -- energy source; C0310B Computer facilities -- C3110B Voltage control -- C3340H Control of electric power systems -- B8120K Distributed power generation; Smart power grids -- Periodicals; Computer science -- Periodicals; Energy industries -- Periodicals; Broadcasting -- Periodicals; 333.79110285
• DOI: 10.1049/iet-stg.2019.0281
• Languages: English
• ISSNs: 2515-2947

Abstract

Abstract : Microgrid technology is poised to transform the electricity industry. In the context of commercial/domestic buildings and data centers, where most loads are native direct current, DC microgrids are in fact a natural choice. Voltage stability and current/power‐sharing between sources within a DC microgrid have been studied extensively in recent years. DC voltage droop control is known to have its drawbacks in that current or power‐sharing is relatively poor. To eliminate this drawback, some have proposed to add a communication‐based consensus control in addition to the primary voltage droop control loop. The current sharing performance is improved, however, the voltage deviation inherent in droop control requires a further, slower control to achieve voltage quality control. To overcome this complication, and reduction in response time, a low latency communication‐based control technique that achieves proportional current sharing without significant voltage deviations is proposed in this work. The stability of the proposed control technique is compared to state‐of‐the‐art using eigenvalue and transient analyses. The negative impact of communication delays on proposed control is discussed in detail.