Improved Instantaneous Average Current-Sharing Control Scheme for Parallel-Connected Inverter Considering Line Impedance Impact in Microgrid Networks

Roslan, Muhamad Akhmal Hakim; Ahmed, Khaled; Finney, S.J.; Williams, B.W.

doi:10.1109/tpel.2010.2102775

Cited by 111 publications

(64 citation statements)

References 40 publications

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“…In the master-slave control, the master converter works as a VSI by producing controlled voltage, while slave inverters act as CSIs by obeying the current pattern ordered from the master inverter [74,75]. The average load sharing control continuously updates the current reference for each inverter as a weighted average current [76,77]. To achieve proper power sharing and smooth mode transfer, peak-value based current sharing control is applied, where the reference current magnitude of a VSI is determined by the current magnitude of the VSI through peak value calculation [78,79].…”

Section: Communication-based Controlmentioning

confidence: 99%

Overview of AC Microgrid Controls with Inverter-Interfaced Generations

et al. 2017

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Distributed generation (DG) is one of the key components of the emerging microgrid concept that enables renewable energy integration in a distribution network. In DG unit operation, inverters play a vital role in interfacing energy sources with the grid utility. An effective interfacing can successfully be accomplished by operating inverters with effective control techniques. This paper reviews and categorises different control methods (voltage and primary) for improving microgrid power quality, stability and power sharing approaches. In addition, the specific characteristics of microgrids are summarised to distinguish from distribution network control. Moreover, various control approaches including inner-loop controls and primary controls are compared according to their relative advantages and disadvantages. Finally, future research trends for microgrid control are discussed pointing out the research opportunities. This review paper will be a good basis for researchers working in microgrids and for industry to implement the ongoing research improvement in real systems.

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Section: Communication-based Controlmentioning

confidence: 99%

Overview of AC Microgrid Controls with Inverter-Interfaced Generations

et al. 2017

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“…In [10], rather than regulating DC voltage and applying consensus-based approach on current sharing, the droop coefficient of each converter is adjusted to further enhance the current sharing among multiple converters. In [11], a generalized system-level model comprised of multiple parallel converters is derived to analyze the power sharing issues considering line impedance. Meanwhile, adaptive gain scheduling technology is employed to compensate the mismatching line impedance.…”

Section: Review Of Active Current Sharing Strategies In DC Microgridsmentioning

confidence: 99%

Looped-chain-based active current sharing strategy in DC microgrids

Liu

et al. 2017

Archives of Electrical Engineering

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Abstract:The integration of renewable energy sources in modern electric grids have drawn increasing attention nowadays. In order to effectively manage large-scale renewable energy sources and achieve flexible and efficient operation, the concept of microgrids have been proposed. Considering the nature of DC outputs in many distributed energy resources (DERs), DC microgrids have been extensively studied in the past years. Among the operational issues in DC microgrids, current sharing issues have become an important topic since it is highly relevant to the operation of DC microgrids. By adopting a proper design of current sharing strategy in DC microgrids, the current rating violations in each interface converter can be successfully avoided. In this paper, a looped-chainbased active current sharing strategy is proposed to realize high accuracy current sharing in DC microgrids. In particular, the output current is shared between the neighboring interface converters. Hence, following a clockwise or counter-clockwise order, a loopedchain-based control diagram can be established to share the reference value of the output current. A final status in the whole DC microgrid is that the output current of every interface converter is equalized. Hence, the desired current sharing objective can be satisfied. A MATLAB simulation model is established to verify the proposed loopedchain-based active current sharing strategy in DC microgrids.

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“…2, it can be seen that the drive circuitry for switches S 1 and S 2 does not demand isolation because their source terminals are both connected to the same reference node, what is an advantage over the interleaved topology. Besides, current sharing is of great concern in interleaving converters [22], [23], what is assured in the 3SSC buck converter due to the autotransformer without the use of special control schemes.…”

Section: F Theoretical Comparison With Other Buck-based Topologiesmentioning

confidence: 99%

A DC–DC Converter Based on the Three-State Switching Cell for High Current and Voltage Step-Down Applications

Balestero

Tofoli

Torrico-Bascopé

et al. 2013

IEEE Trans. Power Electron.

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This paper presents a pulsewidth modulation dc-dc nonisolated buck converter using the three-state switching cell, constituted by two active switches, two diodes, and two coupled inductors. Only part of the load power is processed by the active switches, reducing the peak current through the switches to half of the load current, as higher power levels can then be achieved by the proposed topology. The volume of reactive elements, i.e., inductors and capacitors, is also decreased since the ripple frequency of the output voltage is twice the switching frequency. Due to the intrinsic characteristics of the topology, total losses are distributed among all semiconductors. Another advantage of this converter is the reduced region for discontinuous conduction mode when compared to the conventional buck converter or, in other words, the operation range in continuous conduction mode is increased, as demonstrated by the static gain plot. The theoretical approach is detailed through qualitative and quantitative analyses by the application of the three-state switching cell to the buck converter operating in nonoverlapping mode (D < 0.5). Besides, the mathematical analysis and development of an experimental prototype rated at 1 kW are carried out. The main experimental results are presented and adequately discussed to clearly identify its claimed advantages.Index Terms-Buck converter, dc-dc converters, three-state switching cell (3SSC).

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Improved Instantaneous Average Current-Sharing Control Scheme for Parallel-Connected Inverter Considering Line Impedance Impact in Microgrid Networks

Cited by 111 publications

References 40 publications

Overview of AC Microgrid Controls with Inverter-Interfaced Generations

Overview of AC Microgrid Controls with Inverter-Interfaced Generations

Looped-chain-based active current sharing strategy in DC microgrids

A DC–DC Converter Based on the Three-State Switching Cell for High Current and Voltage Step-Down Applications

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