Installation on a community-sized DC microgrid system and suggestion on a DC short-circuit test procedure

Abstract

Installation and operation of a real DC microgrid (J1G) with variable energy sources are studied in this paper.Concrete�y, the paper presents main distributed energy sources as well as protective devices to construct the low voltage DC J1.G. Simulation on faulted and normal operation modes of the DC pG is also mentioned to observe signals of voltage, current, and power. Based on the simulation results, it is proposed that operation of fast acting fuses (FAFs) is velY ifficient to replace no-fuse breakers (NFBs) at some certain locations for protecting DC microgrids. Next, planning for actual short-circuit (SC) test procedures at the DC microgrid is peljormed, which focuses on staged fault tests containing pole-to-pole and pole-to-groundfaults. Peljormance of SC test procedures is to validate estimation of fault CUITents and the DC protection system proposed. As a result, the paper indicates new contributions on bUilding the real community-sized DC J1.G and suggestions on doing staged short-circuit tests.

Decentralized Mode-Adaptive Guidance and Control for DC Microgrid

“…The primary subsystems of [13] are the grid model of (1), the storage control law of (2), and the OXD power apportionment strategy of (7) and (8). The OXD apportionment strategy of Fig.…”

“…This creates two broad categories of microgrids based on their configuration: (i) islanded microgrids, or those completely M disconnected from any other power grid and (ii) networked microgrids, or those connected to either a large utility power grid or other microgrids [4], [5]. Islanded microgrids can play a role in networked microgrids, as well as provide a means for powering remote locations [4], [6], [7], [8].…”

“…First, dc microgrids have been found to be more efficient, eliminating losses associated with the ac/dc and dc/ac conversions necessary for the integration of many renewable energy sources, storage systems, and dc loads [18], [19]. Second, dc microgrids do not suffer from the additional complexity of frequency synchronization and control of reactive power [8], [19]. This paper will develop a decentralized, mode-adaptive (DMA) power apportionment strategy for a dc microgrid, that under specific initial conditions, performs similar to the OXD power apportionment strategy of [13] in terms of bus voltage ripple and exergy destruction rate in steady state, with the added benefit of increased scalability.…”