Multifunctional control design for modular plug-and-play battery storage in DC microgrids

Plug-and-Play (P&P) performance facilitates the modularity of DC microgrids. The realization of P&P operation relies on the control design of DC microgrids. Conventional control methods are normally designed for steady operation of a DC microgrid, neglecting or partially sacrifices the availability of P&P operations. Some bottom layer’s control designs such as droop control, from a hierarchical control scheme perspective for example, are inherently able to realize P&P operations. However, such methods have limitations in terms of power sharing accuracy. This paper proposes a control scheme that reconfigures hierarchical control and makes it more compatible for different P&P operation situations in DC microgrids. In this control scheme, Automatic Mater-Slave (AMS) control is implemented in the secondary control layer to automatically respond to those cases in the absence of communication or the failure of the master module. The proposed control scheme is validated by MATLAB/Simulink simulation

A Robust Consensus Algorithm for Current Sharing and Voltage Regulation in DC Microgrids

In this paper a novel distributed control algorithm for current sharing and voltage regulation in Direct Current (DC) microgrids is proposed. The DC microgrid is composed of several Distributed Generation units (DGUs), including Buck converters and current loads. The considered model permits an arbitrary network topology and is affected by unknown load demand and modelling uncertainties. The proposed control strategy exploits a communication network to achieve proportional current sharing using a consensus-like algorithm. Voltage regulation is achieved by constraining the system to a suitable manifold. Two robust control strategies of Sliding Mode (SM) type are developed to reach the desired manifold in a finite time. The proposed control scheme is formally analyzed, proving the achievement of proportional current sharing, while guaranteeing that the weighted average voltage of the microgrid is identical to the weighted average of the voltage references.Comment: 12 page