A distributed control strategy based on droop control and low-bandwidth communication in DC microgrids with increased accuracy of load sharing

2018 ◽  
Vol 40 ◽  
pp. 155-164 ◽  
Author(s):  
Pedram Ghalebani ◽  
Mohsen Niasati
Keyword(s):  
Distributed Control ◽  
Control Strategy ◽  
Load Sharing ◽  
Droop Control ◽  
Dc Microgrids

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 Distributed Control Strategy for DC Microgrids of Photovoltaic Energy Storage Systems in Off-Grid Operation

Energies ◽  
2018 ◽  
Vol 11 (10) ◽  
pp. 2637 ◽  
Author(s):  
Mingxuan Chen ◽  
Suliang Ma ◽  
Haiyong Wan ◽  
Jianwen Wu ◽  
Yuan Jiang
Keyword(s):  
Energy Storage ◽  
Power Systems ◽  
Distributed Control ◽  
Control Strategy ◽  
Storage System ◽  
Voltage Stabilizer ◽  
Dc Microgrid ◽  
Dc Microgrids ◽  
Photovoltaic Energy ◽  
Operation Conditions

DC microgrid systems that integrate energy distribution, energy storage, and load units can be viewed as examples of reliable and efficient power systems. However, the isolated operation of DC microgrids, in the case of a power-grid failure, is a key factor limiting their development. In this paper, we analyze the six typical operation modes of an off-grid DC microgrid based on a photovoltaic energy storage system (PV-ESS), as well as the operational characteristics of the different units that comprise the microgrid, from the perspective of power balance. We also analyze the key distributed control techniques for mode transformation, based on the demands of the different modes of operation. Possible reasons for the failure of PV systems under the control of a voltage stabilizer are also explored, according to the characteristics of the PV output. Based on this information, we propose a novel control scheme for the seamless transition of the PV generation units between the maximum PV power tracking and steady voltage control processes, to avoid power and voltage oscillations. Adaptive drooping and stabilization control of the state of charge of the energy storage units are also considered, for the protection of the ESS and for reducing the possibilities of overcharging and/or over-discharging. Finally, various operation conditions are simulated using MATLAB/Simulink, to validate the performance of the proposed control strategy.

An AC/DC-Coupled Droop Control Strategy for VSC-Based DC Microgrids

2022 ◽  
pp. 1-1
Author(s):  
Boshen Zhang ◽  
Fei Gao ◽  
Yun Zhang ◽  
Dong Liu ◽  
Houjun Tang
Keyword(s):  
Control Strategy ◽  
Droop Control ◽  
Dc Microgrids
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