Power management of an isolated hybrid AC/DC micro‐grid with fuzzy control of battery banks

Hosseinzadeh, Mehdi; Salmasi, Farzad Rajaei

doi:10.1049/iet-rpg.2014.0271

Cited by 198 publications

(119 citation statements)

References 29 publications

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“…Initially, AC microgrids were evolved, as the conventional power systems were dominated by the AC form [19]. Therefore, integration of renewable distributed generators (RDGs) with the conventional AC systems was widely studied [20].…”

Section: Fuzzy Logic-based Operation Of Battery Energy Storage Systemmentioning

confidence: 99%

“…DC microgrids allow easier integration of renewables along with the elimination of harmonic distortion and synchronization issues inherently [22]. Therefore, integration of AC and DC microgrids is proposed, and this emerges the concept of hybrid AC/DC microgrids [19]. Due to above-mentioned merits, a hybrid AC/DC microgrid is considered in this study.…”

Section: Fuzzy Logic-based Operation Of Battery Energy Storage Systemmentioning

confidence: 99%

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Fuzzy Logic-Based Operation of Battery Energy Storage Systems (BESSs) for Enhancing the Resiliency of Hybrid Microgrids

2017

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Abstract:The resiliency of power systems can be enhanced during emergency situations by using microgrids, due to their capability to supply local loads. However, precise prediction of disturbance events is very difficult rather the occurrence probability can be expressed as, high, medium, or low, etc. Therefore, a fuzzy logic-based battery energy storage system (BESS) operation controller is proposed in this study. In addition to BESS state-of-charge and market price signals, event occurrence probability is taken as crisp input for the BESS operation controller. After assessing the membership levels of all the three inputs, BESS operation controller decides the operation mode (subservient or resilient) of BESS units. In subservient mode, BESS is fully controlled by an energy management system (EMS) while in the case of resilient mode, the EMS follows the commands of the BESS operation controller for scheduling BESS units. Therefore, the proposed hybrid microgrid model can operate in normal, resilient, and emergency modes with the respective objective functions and scheduling horizons. Due to the consideration of resilient mode, load curtailment can be reduced during emergency operation periods. Numerical simulations have demonstrated the effectiveness of the proposed strategy for enhancing the resiliency of hybrid microgrids.

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Section: Fuzzy Logic-based Operation Of Battery Energy Storage Systemmentioning

confidence: 99%

Section: Fuzzy Logic-based Operation Of Battery Energy Storage Systemmentioning

confidence: 99%

Fuzzy Logic-Based Operation of Battery Energy Storage Systems (BESSs) for Enhancing the Resiliency of Hybrid Microgrids

2017

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“…The term "hybrid AC/DC microgrid" conventionally refers to a microgrid that includes a conventional AC distribution system, as illustrated in Figure 1, and an extension DC grid that is connected to the AC system through one or more parallel bidirectional converters, as illustrated in Figure 2 [5][6][7][8][9][10][11][12][13][14][15][16][17][18][19][20][21]. In the present study, a new design for a hybrid AC/DC microgrid is proposed, while the two back-to-back (B2B) series and parallel converters are connected between AC and DC microgrids, as shown in Figure 3.…”

Section: Hybrid Ac/dc Microgrid Structurementioning

confidence: 99%

“…The different structures of the hybrid AC/DC microgrid and its coordination control algorithms were proposed in [5][6][7][8]. A real-time energy management algorithm was proposed for hybrid AC/DC microgrids, involving sustainable energy and hybrid energy storage, in [9][10][11]. The desired operating features of the hybrid microgrid can be added through interlinking converters.…”

Section: Introductionmentioning

confidence: 99%

A new proposal for the design of hybrid AC/DC microgrids toward high power quality

Khorasani¹,

Joorabian²,

Seifosadat³

2017

Turk J Elec Eng & Comp Sci

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Considering the advantages of DC microgrids, the extension of the conventional AC distribution grid can be implemented using a DC microgrid. This justifies the realization of a hybrid AC/DC microgrid. In the present study, a new global solution is presented to improve the power quality and to fully compensate the reactive power of an AC microgrid using DC bus capacity while introducing a new design for a hybrid AC/DC microgrid. In the new design, backto-back connections of two series and parallel converters, as well as the presentation of new controllers and simultaneous utilization of an earthing switch, are proposed. The proposed method guarantees the quality of the delivered voltage to consumers and the drawn current from the network according to the IEEE-519 and IEEE-1159 standards under different power quality problems (e.g., interruptions, sags, harmonics, and any variation in voltage/current signals from pure sinusoidal). Through the proposed design of the new hybrid AC/DC microgrid, as a new feature, the operation of the network in islanded mode can be achieved in accordance with power quality standards even in the worst load quality conditions. It should be noted that in common hybrid microgrids in islanded mode, the delivered voltage quality is proportional to the quality of the consumer's load current. Another possibility of the proposed design is the instantaneous VAR compensation of nonlinear and induction loads of consumers to keep the power factor of the distribution transformer close to unit value. Simulation results indicate that there are acceptable levels of compensation for different types of power quality problems. Total harmonic distortions and total demand distortions are below 3% in both the grid-connected and isolated modes of the hybrid AC/DC microgrid.

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“…The main difference is represented by the storage capability, since a fully-decentralized micro-grid is very likely to have batteries to guarantee continuous energy supply. How to optimally control this battery is a research topic [9], [10]. On the other hand, in a Smart Transformer grid the storage is absent or limited.…”

Section: State Of Art Of Micro-grid Conceptsmentioning

confidence: 99%

Analysis of the frequency‐based control of a master/slave micro‐grid

Buticchi

Carne

Barater

et al. 2016

IET Renewable Power Generation

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Renewable energy penetration in the low-voltage grid faces several limitations due to the current grid topology. Master/slave micro-grids could help solving these issues, by offering additional services to the grid, such as the power management of the distributed power energy sources.In some cases, the power produced by the distributed energy sources exceeds the local consumption of the low-voltage grid. The consequent reverse power flow can be either dangerous (for the medium voltage) or impossible (for a micro-grid with limited storage). The droop characteristic of commercial inverter can be exploited to avoid this behavior. However stability problems can arise due to a low phase-locked-loop (PLL) bandwidth. This paper investigates the stability of this solution depending on the bandwidth of the PLL of the distributed power generation sources. I. INTRODUCTIONThe distributed power generation systems (DPGS) became more and more important over the last few years. Their increasing popularity has been driven by the use of renewable energy sources and the rising costs of the energy distribution, leading to modifications of the electric grid. Among the renewable energy sources employed in this framework, photovoltaic (PV) is receiving a great attention. PV systems can be divided into island-grid (or stand-alone), where the converters supply local loads, and grid-connected, where the power produced by the panels is transferred to the electrical grid.In general, grid-connected systems have been preferred to stand-alone ones, since the mains can compensate the energy production oscillations due to the variable nature of the PV source. As a consequence a great number of distributed low power sources have been connected to the LV grid in the last years, leading in some case to grid stability problem such as: transformer reverse power flow, voltage rise, unexpected islanding operations, sympathetic tripping, etc.[1], [2].To partially mitigate these problems, standards have recently imposed to grid-connected inverters to vary their output power in function of the instantaneous value of grid voltage and frequency (CEI-021 [3]). In fact, when in a LV grid the amount of energy from installed distributed sources is comparable to the loads' consumption, particular care must be taken to manage conditions of high imbalance between power generation and energy demand. Therefore, grid-connected systems have to limit their output power to face the cases of low local consumption. For PV systems an example is that of summer months in south European regions, when to an high PV energy production may not correspond an equivalent local demand [4]. This paper investigates the stability of a micro-grid where a frequency control is adopted to manage the power balance [5]- [7]. The basic assumption is that the frequency of the micro-grid can be changed (fully-decentralized micro-grid or smart-transformer micro-grid) to interact with the distributed sources. The novelty of the proposed approach is that standard current-controlled grid-connected ...

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Power management of an isolated hybrid AC/DC micro‐grid with fuzzy control of battery banks

Cited by 198 publications

References 29 publications

Fuzzy Logic-Based Operation of Battery Energy Storage Systems (BESSs) for Enhancing the Resiliency of Hybrid Microgrids

Fuzzy Logic-Based Operation of Battery Energy Storage Systems (BESSs) for Enhancing the Resiliency of Hybrid Microgrids

A new proposal for the design of hybrid AC/DC microgrids toward high power quality

Analysis of the frequency‐based control of a master/slave micro‐grid

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