Distributed hierarchical droop control of boost converters in DC microgrids

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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Hybrid isochronous-droop control for power management in DC microgrids

2017 19th European Conference on Power Electronics and Applications (EPE'17 ECCE Europe) ◽

10.23919/epe17ecceeurope.2017.8099378 ◽

2017 ◽

Author(s):

Inam Ullah Nutkani ◽

Donald Grahame Holmes

Keyword(s):

Power Management ◽

Droop Control ◽

Dc Microgrids

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

10.36227/techrxiv.16641184.v1 ◽

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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