Autonomous Operation of Hybrid Microgrid With AC and DC Subgrids

Loh, Poh Chiang; Li, Ding; Chai, Yun; Blaabjerg, Frede

doi:10.1109/tpel.2012.2214792

Cited by 651 publications

(359 citation statements)

References 27 publications

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“…Diesel generation is assumed in this paper and the fuel cost model is shown in (9), where C Fuel is the cost of diesel fuel and P t DE is the output of the diesel generator during the t-th period. a 2 , a 1 and a 0 are polynomial coefficients of the consumption characteristic function of DE respectively, whose value are shown in Table A1 of Appendix A.…”

Section: Controllable Distributed Generationmentioning

confidence: 99%

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Double-uncertainty optimal operation of hybrid AC/DC microgrids with high proportion of intermittent energy sources

Han

et al. 2017

J. Mod. Power Syst. Clean Energy

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This paper applies double-uncertainty optimization theory to the operation of AC/DC hybrid microgrids to deal with uncertainties caused by a high proportion of intermittent energy sources. A fuzzy stochastic expectation economic model for day-ahead scheduling based on uncertain optimization theory is proposed to minimize the operational costs of hybrid AC/DC microgrids. The fuzzy stochastic alternating direction multiplier method is proposed to solve the double-uncertainty optimization problem. A real-time intra-day unbalanced power adjustment model is established to minimize real-time adjustment costs. Through comparative analysis of deterministic optimization, stochastic optimization and fuzzy stochastic optimization of day-ahead scheduling and real-time adjustment, the validity of fuzzy stochastic optimization based on a fuzzy stochastic expectation model is proved.

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Section: Controllable Distributed Generationmentioning

confidence: 99%

“…Microgrids can be divided into AC microgrids, DC microgrids and hybrid AC/DC microgrids [7]. Hybrid AC/DC microgrids are one of the most promising microgrid structures combining the advantages of AC and DC microgrids, which is convenient for integrating various forms of distributed generation and load [8,9].…”

Section: Introductionmentioning

confidence: 99%

Double-uncertainty optimal operation of hybrid AC/DC microgrids with high proportion of intermittent energy sources

Han

et al. 2017

J. Mod. Power Syst. Clean Energy

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show abstract

“…Moreover, a number of AC-distributed resources are connected to the microgrid through a multi-stage conversion controller, which lowers the system efficiency to some extent [11][12][13][14][15]. As an alternative to an AC microgrid, a direct current (DC) distribution microgrid has several attractive features and is developed in [16,17].…”

Section: Introductionmentioning

confidence: 99%

A Coordinated Control for Photovoltaic Generators and Energy Storages in Low-Voltage AC/DC Hybrid Microgrids under Islanded Mode

et al. 2016

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Abstract:The increasing penetration of renewable generators can be a significant challenge due to the fluctuation of their power generation. Energy storage (ES) units are one solution to improve power supply quality and guarantee system stability. In this paper, a hybrid microgrid is built based on photovoltaic (PV) generator and ES; and coordinated control is proposed and developed to achieve power management in a decentralized manner. This control scheme contains three different droop strategies according to characteristics of PV and ES. First, the modified droop control is proposed for PV, which can take full utilization of renewable energy and avoid regulating output active power frequently. Second, to maintain the direct current (DC) bus voltage stability, a novel droop control incorporating a constant power band is presented for DC-side ES. Third, a cascade droop control is designed for alternating current (AC)-side ES. Thus, the ES lifetime is prolonged. Moreover, interlinking converters (ICs) provide a bridge between AC/DC buses in a hybrid microgrid. The power control of IC is enabled when the AC-or DC-side suffer from active power demand shortage. In particular, if the AC microgrid does not satisfy the reactive power demand, IC then acts as a static synchronous compensator (STATCOM). The effectiveness of the proposed strategies is verified by simulations.

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“…Compared with AC micro-grid, the DC micro-grid system, which features as one stage energy conversion, can achieve much higher energy recovery efficiency and simpler power circuit topology, since many renewable DGs, energy storing systems (ESSs) [5], and an increasing number of loads directly utilize DC power. Additionally, the DC system offers improved controllability the complex synchronization, and the reactive power compensation control problems intrinsic to the AC grid can be ignored [6,7]. Furthermore, the DC micro-grid can be fully decoupled from the utility grid by an interface converter, enabling the seamless transition between grid-connected and islanded operation modes [8][9][10].…”

Section: Introductionmentioning

confidence: 99%

Energy Management of a Grid-connected High Power Energy Recovery Battery Testing System

Zhang¹,

Liu²,

Yoo³

et al. 2016

Journal of Electrical Engineering and Technology

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-Energy recovery battery testing systems (ERBTS) have been widely used in battery manufactures. All the ERBTS are connected in parallel which forms a special and complicated microgrid system, which has the shortcomings of low energy recovery efficiency, complex grid-connected control algorithms issues for islanded detection, and complicated power circuit topology issues. To solve those shortcomings, a DC micro-grid system is proposed, the released testing energy has the priority to be reutilized between various testing system within the local grid, Compared to conventional scheme, the proposed system has the merits of a simplified power circuit topology, no needs for synchronous control, and much higher testing efficiency. The testing energy can be cycleused inside the local micro-grid. The additional energy can be recovered to AC-grid. Numerous experimental comparison results between conventional and proposed scheme are provided to demonstrate the validity and effectiveness of the proposed technique.

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Autonomous Operation of Hybrid Microgrid With AC and DC Subgrids

Cited by 651 publications

References 27 publications

Double-uncertainty optimal operation of hybrid AC/DC microgrids with high proportion of intermittent energy sources

Double-uncertainty optimal operation of hybrid AC/DC microgrids with high proportion of intermittent energy sources

A Coordinated Control for Photovoltaic Generators and Energy Storages in Low-Voltage AC/DC Hybrid Microgrids under Islanded Mode

Energy Management of a Grid-connected High Power Energy Recovery Battery Testing System

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