Virtual DC machine: an inertia emulation and control technique for a bidirectional DC–DC converter in a DC microgrid. Issue 6 (11th April 2018)

• Record Type: Journal Article
• Authors: Samanta, Soumya; Mishra, Jyoti Prakash; Roy, Binoy Krishna
• Is Part Of: IET electric power applications. Volume 12:Issue 6(2018)
• Page Start: 874
• Page End: 884
• Publication Date: 2018-04-11
• Subjects: DC machines -- voltage control -- distributed power generation -- renewable energy sources -- machine control -- DC‐DC power convertors -- power generation control; virtual DC machine -- bidirectional DC–DC converter -- DC microgrid -- DC bus voltage fluctuations -- DC machine operation -- inertia emulation -- control technique -- VDCM -- controller design -- microgrid applications; Electric power -- Periodicals; Electric power systems -- Periodicals; 621.305
• DOI: 10.1049/iet-epa.2017.0770
• Languages: English
• ISSNs: 1751-8660

Abstract

Abstract : In a DC microgrid (DCMG), the DC bus voltage is vulnerable to the power fluctuations caused by the variations of intermittent renewable energy sources and local loads. A concept is developed to operate a bidirectional DC–DC converter as a DC machine to mimic the inertia characteristic of a DC machine and regulate the DC bus voltage fluctuations during power fluctuations of the DCMG. The concept of operating a bidirectional DC–DC converter as a DC machine can be termed as virtual DC machine (VDCM). The proposed concept of a VDCM is basically a control technique for a bidirectional DC–DC converter, which is derived from the theory of the DC machine operation and its speed control technique. The implementation, operation, controller design and dynamics of VDCM are also discussed. A VDCM can be easily operated in both generating and motoring mode also. Being free from comparatively slower mechanical devices, a VDCM can switch over from one mode to another very quickly. Hence, it provides a useful way to control the storage devices in microgrid applications.