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

10.36227/techrxiv.16641184 ◽

2021 ◽

Author(s):

Mohammadreza Nabatirad ◽

Reza Razzaghi ◽

Behrooz Bahrani

Keyword(s):

Control System ◽

Load Sharing ◽

Voltage Regulation ◽

Control Technique ◽

Droop Control ◽

Dc Microgrids ◽

Distributed Generator ◽

Voltage Compensation ◽

Terminal Voltage ◽

Unit Output

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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Compensation of droop control using common load condition in DC microgrids to improve voltage regulation and load sharing

International Journal of Electrical Power & Energy Systems ◽

10.1016/j.ijepes.2014.07.079 ◽

2015 ◽

Vol 64 ◽

pp. 752-760 ◽

Cited By ~ 59

Author(s):

Nanfang Yang ◽

Damien Paire ◽

Fei Gao ◽

Abdellatif Miraoui ◽

Weiguo Liu

Keyword(s):

Load Condition ◽

Load Sharing ◽

Voltage Regulation ◽

Droop Control ◽

Dc Microgrids

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Improved droop control for effective load sharing and voltage regulation in DC microgrids

2016 Electric Power Quality and Supply Reliability (PQ) ◽

10.1109/pq.2016.7724101 ◽

2016 ◽

Cited By ~ 2

Author(s):

Gedeon Niyitegeka ◽

Jaeho Choi ◽

Yeonho Ok

Keyword(s):

Load Sharing ◽

Voltage Regulation ◽

Droop Control ◽

Dc Microgrids

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Optimized Droop Control Parameters for Effective Load Sharing and Voltage Regulation in DC Microgrids

Electric Power Components and Systems ◽

10.1080/15325008.2015.1021220 ◽

2015 ◽

Vol 43 (8-10) ◽

pp. 879-889 ◽

Cited By ~ 16

Author(s):

Fatih Cingoz ◽

Ali Elrayyah ◽

Yilmaz Sozer

Keyword(s):

Load Sharing ◽

Voltage Regulation ◽

Droop Control ◽

Control Parameters ◽

Dc Microgrids

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Investigation of Adaptive Droop Control Applied to Low-Voltage DC Microgrid

Energies ◽

10.3390/en14175356 ◽

2021 ◽

Vol 14 (17) ◽

pp. 5356

Author(s):

Prudhvi Kumar Gorijeevaram Reddy ◽

Sattianadan Dasarathan ◽

Vijayakumar Krishnasamy

Keyword(s):

Power Flow ◽

Control Method ◽

Low Voltage ◽

Experimental Studies ◽

Load Sharing ◽

Voltage Regulation ◽

Primary Objective ◽

Control Technique ◽

Droop Control ◽

Dc Microgrid

In a DC microgrid, droop control is the most common and widely used strategy for managing the power flow from sources to loads. Conventional droop control has some limitations such as poor voltage regulation and improper load sharing between converters during unequal source voltages, different cable resistances, and load variations. This paper addressed the limitations of conventional droop control by proposing a simple adaptive droop control technique. The proposed adaptive droop control method was designed based on mathematical calculations, adjusting the droop parameters accordingly. The primary objective of the proposed adaptive droop controller was to improve the performance of the low-voltage DC microgrid by maintaining proper load sharing, reduced circulating current, and better voltage regulation. The effectiveness of the proposed methodology was verified by conducting simulation and experimental studies.

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Multidimensional Optimal Droop Control for DC Microgrids in Military Applications

Applied Sciences ◽

10.3390/app8101966 ◽

2018 ◽

Vol 8 (10) ◽

pp. 1966 ◽

Cited By ~ 2

Author(s):

Kaitlyn Bunker ◽

Michael Cook ◽

Wayne Weaver ◽

Gordon Parker

Keyword(s):

Control System ◽

Control Strategy ◽

System Reliability ◽

Droop Control ◽

Hardware In The Loop ◽

Dc Microgrids ◽

Military Applications ◽

Bus Voltage ◽

Solar Resource

Reliability is a key consideration when microgrid technology is implemented in military applications. Droop control provides a simple option without requiring communication between microgrid components, increasing the control system reliability. However, traditional droop control does not allow the microgrid to utilize much of the power available from a solar resource. This paper applies an optimal multidimensional droop control strategy for a solar resource connected in a microgrid at a military patrol base. Simulation and hardware-in-the-loop experiments of a sample microgrid show that much more power from the solar resource can be utilized, while maintaining the system’s bus voltage around a nominal value, and still avoiding the need for communication between the various components.

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