scholarly journals Multidimensional Optimal Droop Control for DC Microgrids in Military Applications

2018 ◽  
Vol 8 (10) ◽  
pp. 1966 ◽  
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.

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

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.

scholarly journals Research on Bus Voltage Control Strategy of Off-grid DC Microgrid

2020 ◽  
Vol 185 ◽  
pp. 01064
Author(s):  
Yilonɡ Kanɡ ◽  
Ningkang Zheng ◽  
Xiangyang Yan ◽  
Huanruo Qi ◽  
Kai Li
Keyword(s):  
Control Strategy ◽  
High Reliability ◽  
Voltage Control ◽  
Droop Control ◽  
Voltage Control Strategy ◽  
Dc Microgrid ◽  
Voltage Quality ◽  
Dc Bus ◽  
Bus Voltage

It is important to achieve stability of bus voltage in control of DC microgrids. In the DC microgrid, the traditional droop control method is usually adopted to stabilize the bus voltage for its high reliability and cost-effectiveness. However, line resistance will reduce the voltage quality of the DC bus in actual situations. In order to improve the voltage quality of the DC bus, a novel bus voltage control strategy based on modified droop characteristic is proposed. Finally, the simulation model of the off-grid DC microgrid with improved droop control strategy is built on PSCAD/EMTDC platform, and the results verify the effectiveness and feasibility of the proposed control strategy.

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