Cost analysis of distributed storage in AC and DC microgrids

Gerber, Dániel; Nordman, Bruce; Brown, Richard E.; Poon, Jason

doi:10.1016/j.apenergy.2023.121218

Cited by 8 publications

(2 citation statements)

References 61 publications

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“…To demonstrate the effectiveness of the DC-DC converter DT modeling method, four simulation cases are conducted as discussed in the following subsections. The parameters for the simulation are listed in Table 1 , in which 48 V is a type of low-voltage dc microgrids that has been widely used for residential and communication applications 21 , 22 and for simulation and experimental verification in microgrids and renewable energy studies 23 , 24 . The time step employed for running the DT is 0.1 ms.…”

Section: Resultsmentioning

confidence: 99%

Digital twin based monitoring and control for DC-DC converters

Lei,

Zhou,

Dai

et al. 2023

Nat Commun

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The monitoring and control of DC-DC converters have become key issues since DC-DC converters are gradually playing increasingly crucial roles in power electronics applications such as electric vehicles and renewable energy systems. As an emerging and transforming technology, the digital twin, which is a dynamic virtual replica of a physical system, can potentially provide solutions for the monitoring and control of DC-DC converters. This work discusses the design and implementation of the digital twin DC-DC converter in detail. The key features of the physical and twin systems are outlined, and the control architecture is provided. To verify the effectiveness of the proposed digital twin method, four possible cases that may occur during the practical control scenarios of DC-DC converter applications are discussed. Simulations and experimental verification are conducted, showing that the digital twin can dynamically track the physical DC-DC converter, detect the failure of the physical controller and replace it in real time.

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Section: Resultsmentioning

confidence: 99%

Digital twin based monitoring and control for DC-DC converters

Lei,

Zhou,

Dai

et al. 2023

Nat Commun

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“…Lately, however, DC distribution has gained interest following the market development of DC sources, i.e., solar photovoltaic (PV) [1] and battery storage [2]. Advancements in power electronic technologies [3] and the availability of DC-ready and compatible end-user products [4][5][6] also incentivize DC distribution in buildings. Previous works have reported reduced energy losses [7,8], enhanced power quality [9], and cost savings [10] with DC distribution.…”

Section: Introductionmentioning

confidence: 99%

Enhanced DC Building Distribution Performance Using a Modular Grid-Tied Converter Design

Ollas,

Thiringer,

Persson

2024

Energies

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This work quantifies the techno-economic performance of AC and DC residential building distribution. Two methods, utilising software and hardware configurations, are showcased to improve DC distribution: (i) a novel rule-based battery dual-objective operation (DOO) and (ii) a modular Master/Slave design of the grid-tied converter (GC). Both methods use the GC’s load-dependent efficiency characteristic, eliminating partial-load operation and enhancing energy efficiency. The work uses measured annual PV and load data to evaluate the performance of the methods compared to AC and DC references. The techno-economic analysis includes the annual net electricity bill and monetised battery degradation. The results show that the DOO eliminates GC partial-load operation at the cost of increased battery usage, resulting in marginal net savings. In contrast, the modular converter design significantly reduces losses: −157 kWh/a (−31%) and −121 kWh/a (−26%), respectively, relative to the DC and AC references. For a parametric sweep of electricity price and discount rate, the Lifetime Operating Cost (LOC) comparison shows savings from DC of up to USD 575 compared to AC.

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