Restricting Voltage Deviation of DC Microgrids with Critical and Ordinary Nodes

TL;DR

This paper introduces a distributed control algorithm for multi-bus DC microgrids that balances voltage regulation and current sharing, especially managing critical and ordinary nodes effectively under plug-and-play conditions.

Contribution

It presents a novel control strategy that ensures voltage stability for critical nodes while maintaining current sharing among ordinary nodes in DC microgrids.

Findings

The proposed algorithm effectively restricts voltage deviations in simulations.

It achieves voltage regulation for critical nodes and current sharing for ordinary nodes.

The control method works under plug-and-play configurations.

Abstract

Restricting bus voltage deviation is crucial for normal operation of multi-bus DC microgrids, yet it has received insufficient attention due to the conflict between two main control objectives in DC microgrids, i.e., voltage regulation and current sharing. By revealing a necessary and sufficient condition for achieving these two objectives, this paper proposes a compromised distributed control algorithm, which regulates the voltage deviation of all buses by relaxing the accuracy of current sharing. Moreover, for a class of DC Microgrids consisting of both critical nodes and ordinary nodes, this paper proposes a distributed control algorithm that restricts the voltage deviation of critical nodes and simultaneously keeps the current sharing of ordinary nodes. This algorithm also works under plug-and-play settings. Simulations illustrate our theory.