Hierarchical Control of Parallel AC-DC Converter Interfaces for Hybrid Microgrids

Liu, Xiaonan; Guerrero, Josep M.; Sun, Kai; Vasquez, Juan C.; Teodorescu, Remus; Huang, Ling

doi:10.1109/tsg.2013.2272327

Cited by 364 publications

(152 citation statements)

References 26 publications

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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%

“…In this paper, some of the recent studies conducted on hybrid AC/DC microgrids are reviewed. 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].…”

Section: Introductionmentioning

confidence: 99%

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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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Section: Hybrid Ac/dc Microgrid Structurementioning

confidence: 99%

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

View full text Add to dashboard Cite

show abstract

“…Commonly, these control schemes can be categorized as centralized and decentralized control [10][11][12][13][14][15][16][17][18][19][20][21]. In centralized control, the controller collects system data using a high bandwidth communication link, schedules the tasks based on the collected information, and directs control decisions [12,[16][17][18].…”

Section: Introductionmentioning

confidence: 99%

Proportional Load Sharing and Stability of DC Microgrid with Distributed Architecture Using SM Controller

Rashad

Raoof

Ashraf

et al. 2018

Mathematical Problems in Engineering

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DC microgrids look attractive in distribution systems due to their high reliability, high efficiency, and easy integration with renewable energy sources. The key objectives of the DC microgrid include proportional load sharing and precise voltage regulation. Droop controllers are based on decentralized control architectures which are not effective in achieving these objectives simultaneously due to the voltage error and load power variation. A centralized controller can achieve these objectives using a high speed communication link. However, it loses reliability due to the single point failure. Additionally, these controllers are realized through proportional integral (PI) controllers which cannot ensure load sharing and stability in all operating conditions. To address limitations, a distributed architecture using sliding mode (SM) controller utilizing low bandwidth communication is proposed for DC microgrids in this paper. The main advantages are high reliability, load power sharing, and precise voltage regulation. Further, the SM controller shows high robustness, fast dynamic response, and good stability for large load variations. To analyze the stability and dynamic performance, a system model is developed and its transversality, reachability, and equivalent control conditions are verified. Furthermore, the dynamic behavior of the modeled system is investigated for underdamped and critically damped responses. Detailed simulations are carried out to show the effectiveness of the proposed controller.

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“…The master node is still a single point-of-failure. There have been some other power flow management methods based on communication [25,26]. In [25], a centralized controller is proposed to generate a compensation signal of primary layer.…”

Section: Introductionmentioning

confidence: 99%

“…Thus, an accurate and optimized power exchange between two subgrids is provided. In [26], a three-level hierarchical control for parallel ICs between AC bus and DC bus in a hybrid microgrid is presented. The bus voltage deviation caused by the droop control in the primary control level is restored, and proportional current sharing is accomplished.…”

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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Hierarchical Control of Parallel AC-DC Converter Interfaces for Hybrid Microgrids

Cited by 364 publications

References 26 publications

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

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

Proportional Load Sharing and Stability of DC Microgrid with Distributed Architecture Using SM Controller

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

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