Autonomous Load Sharing of Voltage Source Converters

Sao, Charles; Lehn, Peter W.

doi:10.1109/tpwrd.2004.838638

Cited by 261 publications

(155 citation statements)

References 5 publications

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“…Therefore, these methods are only valid for the microgrid with short distribution lines where the line impedance is negligible. Recently, the virtual reactor or integral unit to adjust the equivalent impedance of DGs is added to the conventional droop control loop [13,14]. However, the line impedance is still unknown even the equivalent impedance of DGs can be established.…”

Section: Introductionmentioning

confidence: 99%

Droop control method for load share and voltage regulation in high-voltage microgrids

Shuai

Wang

et al. 2016

J. Mod. Power Syst. Clean Energy

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When the line impedance is considered in the microgrid, the accuracy of load sharing will decrease. In this paper, the impact of line impedance on the accuracy of load sharing is analyzed. A robust droop control for a highvoltage microgrid is proposed based on the signal detection on the high-voltage side of the coupling transformer. For a high-voltage microgrid, the equivalent impedance of coupling transformer connecting distributed generator with the grid is usually the dominate factor. Compared with the conventional droop control strategy, the proposed control method in this paper detects the feedback signal from the high-voltage side of the coupling transformer. The impact of line impedance on the load sharing accuracy can be mitigated significantly. The proposed droop control only changes the detection point of the feedback signal, thus it is easy to be implemented. The PSCAD/EMTDC simulation results show the effectiveness of the proposed robust droop control concept in load sharing and voltage regulation with highly accuracy.

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Section: Introductionmentioning

confidence: 99%

Droop control method for load share and voltage regulation in high-voltage microgrids

Shuai

Wang

et al. 2016

J. Mod. Power Syst. Clean Energy

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“…In [9], a small highfrequency signal is injected in the system as control signal for the output active and reactive power. However, the circuitry required to measure the small real power variations in this signal adds to the complexity of the control [10]. In [10], each unit regulates its terminal voltage based on the reference voltage that is obtained from, firstly, the conventional Q/V droops and, secondly, a correction term based on the measured load voltage.…”

Section: Introductionmentioning

confidence: 99%

“…However, the circuitry required to measure the small real power variations in this signal adds to the complexity of the control [10]. In [10], each unit regulates its terminal voltage based on the reference voltage that is obtained from, firstly, the conventional Q/V droops and, secondly, a correction term based on the measured load voltage. An analogous method to achieve accurate power sharing by introducing load voltage feedback is presented in [11].…”

Section: Introductionmentioning

confidence: 99%

“…In this paper, the method of [10] is modified to improve the active power sharing ratio in low-voltage networks. The modifications are twofold.…”

Section: Introductionmentioning

confidence: 99%

“…The modifications are twofold. Firstly, [10] focusses on Q/V droops in the conventional P /f -Q/V droop control, while here, the P /V droops in the VBD control are adapted. Secondly, in microgrids, there is not a single load voltage.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Improvement of active power sharing ratio of P/V droop controllers in low-voltage islanded microgrids

Vandoorn

Kooning

Meersman

et al. 2013

2013 IEEE Power &Amp; Energy Society General Meeting

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Abstract-Microgrids provide a coordinated integration of distributed generation units in the electrical power system. By operating in islanded mode, they can increase the reliability of the system or electrify remote areas. For the power sharing and voltage control in low-voltage microgrids, active power/grid voltage droop control is highly suitable. In order to optimize the integration of renewable energy sources in the microgrid, a variant of this droop control, the voltage-based droop (VBD) control, has been presented. A well-known concern about droop controllers is the inherent trade-off between voltage control and power sharing. Therefore, in this paper, an additional control loop is included in the VBD control to improve the active power sharing ratio. In this way, accurate power sharing is achieved, i.e., the DG units respond to load changes exactly according to their droops. Although this modification relies on communication, it does not jeopardize the reliability of the microgrid as if the communication is lost, the basic VBD control still ensures a stable microgrid operation, while operating without the need for communication.

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A comprehensive review on issues, investigations, control and protection trends, technical challenges and future directions for Microgrid technology

Choudhury

2020

Int Trans Electr Energ Syst

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Summary Recent researches in electrical grids and networks fraternity are directed toward the integration of Microgrid (MG) technologies across the consumer's end. Nowadays, conventional power grid networks are obsolete due to its difficulty of control and protection when many numbers of distributed generations are used. MGs thus acts as a viable solution replacing the conventional grid as it provides integrating platform for Microsources, loads, Electrical Energy Storage Devices and Power Electronic Devices at the demand end within a small locality. MGs are capable of operating either in grid connected or autonomous mode of operation during a faulted situation. However, the system's stability, reliability, and operational control is of extreme concern basically during the islanded mode of operation. Regardless of that, very notable real time implementation and commercial use of MGs are yet to be deployed. This research article brings out a comprehensive review of various challenges and issues related to installation of MG, different controllers for power flow control, idea about the protection system, role of MGs in realizing smart grids (SGs), its major shortcomings, and future prospects.

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Autonomous Load Sharing of Voltage Source Converters

Cited by 261 publications

References 5 publications

Droop control method for load share and voltage regulation in high-voltage microgrids

Droop control method for load share and voltage regulation in high-voltage microgrids

Improvement of active power sharing ratio of P/V droop controllers in low-voltage islanded microgrids

A comprehensive review on issues, investigations, control and protection trends, technical challenges and future directions for Microgrid technology

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