Optimal Energy Management of Multi-Microgrids with Sequentially Coordinated Operations

Song, Nah Oak; Lee, Ji Hye; Kim, Hak Man; Im, Yong Hoon; Lee, Jae Yong

doi:10.3390/en8088371

Cited by 55 publications

(33 citation statements)

References 17 publications

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“…The control strategies based on communication can achieve excellent voltage regulation and proper power sharing, including concentrated control [7,8], master/slave control [9], and distributed control [10][11][12]. However, the communication would increase the investment and reduce the system expandability.…”

Section: Introductionmentioning

confidence: 99%

Conventional P-ω/Q-V Droop Control in Highly Resistive Line of Low-Voltage Converter-Based AC Microgrid

et al. 2016

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Abstract:In low-voltage converter-based alternating current (AC) microgrids with resistive distribution lines, the P-V droop with Q-f boost (VPD/FQB) is the most common method for load sharing. However, it cannot achieve the active power sharing proportionally. To overcome this drawback, the conventional P-ω/Q-V droop control is adopted in the low-voltage AC microgrid. As a result, the active power sharing among the distributed generators (DGs) is easily obtained without communication. More importantly, this study clears up the previous misunderstanding that conventional P-ω/Q-V droop control is only applicable to microgrids with highly inductive lines, and lays a foundation for the application of conventional droop control under different line impedances. Moreover, in order to guarantee the accurate reactive power sharing, a guide for designing Q-V droop gains is given, and virtual resistance is adopted to shape the desired output impedance. Finally, the effects of power sharing and transient response are verified through simulations and experiments in converter-based AC Microgrid.

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Section: Introductionmentioning

confidence: 99%

Conventional P-ω/Q-V Droop Control in Highly Resistive Line of Low-Voltage Converter-Based AC Microgrid

et al. 2016

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“…PV sources of DC system are connected to a DC bus through a DC/DC boost converter, while the storage device is linked by a DC/DC buck-boost converter [11]. On the other hand, the PV and storage generation of AC system are connected to AC bus through a cascaded DC/DC/AC converter [34][35][36]. Regardless of the number of ICs, their role is to provide bidirectional energy transfer between two sides, depending on their prevailing internal supply-demand conditions [15].…”

Section: System Structurementioning

confidence: 99%

“…It avoids frequent energy fluctuation and improves the quality of output voltage, but does not take into account the coordination control of multiple DG units. For the optimal operation of hybrid microgrid [33,34], a simple algorithm is developed to determine the required sizing of generating units and the associated storage capacity in [33]. However, it requires the state of charge information of the battery in real-time.…”

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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“…The stand-alone algorithm and the grid-connected algorithm are the key to maintain the stability of the TP/SP MMGs during the power supplies and loads restoration stage. (6) where, µ is the relative optimal membership degree matrix of the decision matrix F in Equation (5), and 0 ď λ ab ď 1. (3) The weighted summations of the column of the relative optimal membership degree matrix µ are calculated with the weight T n = [t 1 t 2 t 3 .…”

Section: Power Supplies and Load Restorationmentioning

confidence: 99%

“…Unlike the single MG, multi-microgrids (MMGs) are a hybrid systems made up of multiple sub-microgrids (SMGs), to meet specific function and control targets [6][7][8]. Considering the independent operation of the SMG and the coordinated operation of the whole system, the control scheme of MMGs should not only ensure the stable operation of each SMG, but also the power exchange between SMGs.…”

Section: Introductionmentioning

confidence: 99%

Black Start Strategy for PV-ESS Multi-Microgrids with Three-Phase/Single-Phase Architecture

et al. 2016

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Abstract:With the rapid development of microgrids (MGs) in recent years, it is anticipated that combinations of multiple microgrids-multi-microgrids (MMGs)-will gradually become a new form of power grid. A safe and efficient black start strategy for MMGs is in urgent demand because of their complicated structure and control systems. In this paper, first, we analyze the topology and control system of residential-type MMGs with three-phase/single-phase (TP/SP) architecture. Second, a black start strategy based on a hierarchical control scheme is presented, including the selection strategy for the main power supply and master microgrid, the stand-alone operation strategy, and the grid-connected operation strategy. After the selection of the main power supplies, the master MG is determined. Hereby, all sub-microgrids (SMGs) execute the stand-alone algorithm. When the synchronous connection condition is satisfied, the slave SMGs connect to the master MG who provides the voltage and frequency support. Meanwhile, the control algorithm transfers to the grid-connected algorithm, with the grid dispatching value set to zero. Finally, experimental results from the MMG experimental setup in the Clean Energy Technology Laboratory (CETLAB) are presented to verify the effectiveness and feasibility of the proposed black start strategy.

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Optimal Energy Management of Multi-Microgrids with Sequentially Coordinated Operations

Cited by 55 publications

References 17 publications

Conventional P-ω/Q-V Droop Control in Highly Resistive Line of Low-Voltage Converter-Based AC Microgrid

Conventional P-ω/Q-V Droop Control in Highly Resistive Line of Low-Voltage Converter-Based AC Microgrid

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

Black Start Strategy for PV-ESS Multi-Microgrids with Three-Phase/Single-Phase Architecture

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