2016 | Dragicevic, Tomislav; Lu, Xiaonan; Quintero, Juan Carlos Vasquez; Guerrero, Josep M.
This paper provides a comprehensive review of control strategies, stability analysis, and stabilization techniques for DC microgrids (MGs). The control strategies are categorized into local and coordinated levels, with coordinated control further divided into decentralized, centralized, and distributed control methods. Local control relies on local measurements, while coordinated control requires communication between units. Decentralized control is based on local measurements, centralized control uses a central controller, and distributed control involves communication between local controllers. The paper discusses the dynamics and stability of DC MGs, highlighting the impact of tightly regulated point-of-load (POL) converters on system stability due to negative impedances. The relationship between source and load impedances, known as the minor loop gain, is crucial for defining system stability. Various specifications for the minor loop gain are reviewed to ensure stability and maintain good system dynamics. Active stabilization techniques are also presented to improve system damping. The paper concludes with a discussion on future research trends and the importance of advanced control functionalities in DC MGs.This paper provides a comprehensive review of control strategies, stability analysis, and stabilization techniques for DC microgrids (MGs). The control strategies are categorized into local and coordinated levels, with coordinated control further divided into decentralized, centralized, and distributed control methods. Local control relies on local measurements, while coordinated control requires communication between units. Decentralized control is based on local measurements, centralized control uses a central controller, and distributed control involves communication between local controllers. The paper discusses the dynamics and stability of DC MGs, highlighting the impact of tightly regulated point-of-load (POL) converters on system stability due to negative impedances. The relationship between source and load impedances, known as the minor loop gain, is crucial for defining system stability. Various specifications for the minor loop gain are reviewed to ensure stability and maintain good system dynamics. Active stabilization techniques are also presented to improve system damping. The paper concludes with a discussion on future research trends and the importance of advanced control functionalities in DC MGs.