A New Technique for Simultaneous Load Current Sharing and Voltage Regulation in DC Microgrids

Setiawan, Made Andik; Abu-Siada, A.; Shahnia, Farhad

doi:10.1109/tii.2017.2761914

Cited by 51 publications

(13 citation statements)

References 31 publications

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“…Voltage shifting techniques are the solution to dynamically shift the voltage back to its predefined nominal value in such situations [8]. Mostly, voltage shifting techniques employ distributed communications, which are based on the combination of decentralized and distributed control [8], [13], [25]. The modified droop control by the voltage shifting technique using a voltage compensation term is…”

Section: Load Sharing In DC Microgridsmentioning

confidence: 99%

Decentralized Voltage Regulation in Islanded DC Microgrids Based on a Modified Droop Control using Superimposed AC Voltage

Nabatirad¹,

Razzaghi²,

Bahrani³

2021

Preprint

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The conventional droop control is a widely-used technique in load sharing among Distributed Generator (DG) units in islanded DC Microgrids (MGs). This method provides Plug-and-Play (PnP) capability for DG units; however, poor load sharing accuracy and unregulated voltage are two shortcomings of that. This article proposes a novel control system in islanded DC MGs to provide simultaneous regulated voltage and accurate load sharing. The method utilizes a modified droop control technique in a decentralized manner. The proposed control system injects a superimposed AC voltage to the network that carries a frequency proportional to the master DG unit output current. The injected voltage adjusts an added a term to the conventional droop control named as the voltage compensation term in order to cancel voltage changes. This term adjusts terminal voltage of DG units proportional to the frequency of the superimposed AC voltage. The performance of the proposed control system is validated via a set of simulation studies using PLECS, and the experimental results confirm the viability and feasibility of the proposed control system.

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Section: Load Sharing In DC Microgridsmentioning

confidence: 99%

Decentralized Voltage Regulation in Islanded DC Microgrids Based on a Modified Droop Control using Superimposed AC Voltage

Nabatirad¹,

Razzaghi²,

Bahrani³

2021

Preprint

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“…Furthermore, the DC supplies can be equally obtained from photovoltaic (PV) output terminals or other renewable energy source. To realize constant output power and voltage for renewable energy sources of intermittent characteristics, some control algorithms such as constant voltage source mode can be employed [29]. It is worth noting that the half-bridge modules will have the same blocking voltage requirement since they are connected across the same DC-supply.…”

Section: The Proposed Multilevel Inverter and Its Modulation Strategymentioning

confidence: 99%

“…DC-DC converter is utilized to maintain the DC voltages v1 and v2 at constant levels as per the control approach proposed in [5,29]. It is assumed that a constant voltage control algorithm as presented in [5,29] is utilized to maintain the PV-modules output voltage at 80 volts as shown in Fig. 16(a).…”

Section: E Case Study 5: Photovoltaic Applicationmentioning

confidence: 99%

A Three-Phase Symmetrical DC-Link Multilevel Inverter With Reduced Number of DC Sources

Hasan

Abu-Siada

Dahidah

2018

IEEE Trans. Power Electron.

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This paper presents a novel three-phase DC-link multilevel inverter topology with reduced number of input DC power supplies. The proposed inverter consists of series-connected half-bridge modules to generate the multilevel waveform and a simple H-bridge module, acting as a polarity generator. The inverter output voltage is transferred to the load through a threephase transformer, which facilitates a galvanic isolation between the inverter and the load. The proposed topology features many advantages when compared with the conventional multilevel inverters proposed in the literatures. These features include scalability, simple control, reduced number of DC voltage sources and less devices count. A simple sinusoidal pulse-width modulation technique is employed to control the proposed inverter. The performance of the inverter is evaluated under different loading conditions and a comparison with some existing topologies is also presented. The feasibility and effectiveness of the proposed inverter are confirmed through simulation and experimental studies using a scaled down low-voltage laboratory prototype.

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“…A number of challenges related to microgrid operation have been reported, and several solutions have been suggested in the literature. One of the common technical issues is related to the power sharing between dispatchable distributed generation units (DDGUs) within the microgrid [1]. If a microgrid has only one large DDGU along with other small non-dispatchable distributed generation units (NDDGUs) (mainly renewable energy sources without energy storage) then only the a single DDGU will have to compensate for any variations in the demand or generation from NDDGUs.…”

Section: Introductionmentioning

confidence: 99%

Active Power Sharing in a Micro-Grid with Multiple Grid Connections

Rizvi

Abu-Siada

2022

Designs

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This paper presents a mechanism for active power sharing among multiple dispatchable and distributed generation units within a micro grid comprising one or multiple interconnections with the main grid. Ideally, a micro grid should act as a constant load or a constant voltage source when connected to the main grid. However, to achieve ideal operation, natural load variations and the intermittency of renewable energy sources within the microgrid need to be adequately and timely compensated for by dispatchable power sources. While several control algorithms have been reported in the literature to achieve ideal microgrid operation, the majority of the proposed methods assumed a micro grid with a single interconnection to the main grid. In the real world, micro grids may have to maintain multiple live links with the main grid for several technical and operational reasons such as reliability, power-dispatch restriction, and operational limitations requirements. Therefore, a new method of active power sharing is proposed in this paper, which is equally effective for micro grids with one or multiple grid connections. The robustness of the proposed method is examined under different microgrid operating conditions. The results reveal the flexibility of the proposed method to adapt under various real-world operating conditions.

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A New Technique for Simultaneous Load Current Sharing and Voltage Regulation in DC Microgrids

Cited by 51 publications

References 31 publications

Decentralized Voltage Regulation in Islanded DC Microgrids Based on a Modified Droop Control using Superimposed AC Voltage

Decentralized Voltage Regulation in Islanded DC Microgrids Based on a Modified Droop Control using Superimposed AC Voltage

A Three-Phase Symmetrical DC-Link Multilevel Inverter With Reduced Number of DC Sources

Active Power Sharing in a Micro-Grid with Multiple Grid Connections

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