One of the major challenges of voltage stabilization in DC microgrids are the large system scale and multiple interacting components. In recent publications, this has been addressed by a scalable and decentralized control design method referred to as plug-and-play. In contrast to the existing approaches, the method presented in this paper does not require the proposition of a Lyapunov function for control design and subsequent stability analysis, and can handle unknown loads (disturbances). It is based on passivity techniques, namely interconnection and damping assignment passivity-based control (IDA-PBC), and port-Hamiltonian systems (PHSs). The Hamiltonian being a byproduct of the modeling step, serves as natural Lyapunov function in our approach, which obviates the proposition step. An extension of the controller
with integral action (IA) robustiﬁes the design against unknown loads. A simulation which illustrates the functionality of the proposed voltage controller concludes our contribution.