Power Management Strategy Based on Virtual Inertia for DC Microgrids

Pedro Jose Dos Santos Neto, Tarcio Andre Dos Santos Barros, Joao Pedro Carvalho Silveira, Ernesto Ruppert Filho, Juan Carlos Vasquez, Josep M. Guerrero

Research output: Contribution to journalJournal articleResearchpeer-review

2 Citations (Scopus)

Abstract

This article presents a power management strategy (PMS) to control the power flow in a dc microgrid operating in the grid-connected mode. The microgrid model is composed of the ac utility grid interfaced with a voltage source inverter operating as a grid-forming converter (VSC), an energy storage system (ESS) formed by a battery bank and a bidirectional dc-dc converter operating as a grid-supporting unit, a distributed generation acting as a grid-feeding unit, and the customer loads with strict voltage regulation. The power management technique applies a virtual inertia concept together with a state of charge-based management function to regulate the charging and discharging process of the battery bank according to the dc microgrid power flow. Thus, high-rate peaks of power are avoided, which improves the ESS life cycle. With the proposed PMS, an autonomous power flow is achieved inside the dc microgrid, while the ac utility grid focuses exclusively upon forming the dc bus and processing the surplus or shortage of power. In addition, the proposed strategy simplifies the communication link between the grid inverter and the ESS, since the VSC power is the sole information exchanged. The experimental results show that the proposed PMS is reliable, leading to high ESS performance and power flow control within the dc microgrid, without degrading the dc bus voltage.
Original languageEnglish
Article number9069316
JournalIEEE Transactions on Power Electronics
Volume35
Issue number11
Pages (from-to)12472-12485
Number of pages14
ISSN0885-8993
DOIs
Publication statusPublished - Nov 2020

Keywords

  • DC microgrid
  • energy storage system
  • grid-connected mode
  • power management strategy
  • virtual inertia

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