Open AccessDistributed virtual inertia control and stability analysis of dc microgrid
Author(s) -
Zhu Xiaorong,
Xie Zhiyun,
Jing Shuzhi,
Ren Hui
Publication year - 2018
Publication title -
iet generation, transmission and distribution
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.92
H-Index - 110
eISSN - 1751-8695
pISSN - 1751-8687
DOI - 10.1049/iet-gtd.2017.1520
Subject(s) - microgrid , control theory (sociology) , inertia , permanent magnet synchronous generator , converters , wind power , computer science , matlab , engineering , voltage , electrical engineering , control (management) , physics , classical mechanics , artificial intelligence , operating system
A dc microgrid is a low inertia system dominated by power converters. As a result, the change rate of the dc voltage is very fast under power variation. In this study, a distributed virtual inertia control is proposed to enhance the inertia of the dc microgrid and decrease the change rate of the dc voltage. The inertia of the dc microgrid can be enhanced by the kinetic energy in the rotor of the permanent magnet synchronous generators (PMSG)‐based wind turbine, the energy stored in batteries and the energy from the utility grid. By introducing a virtual inertia control coefficient, a general expression of the inertial power provided by each controllable power sources is defined. The proposed inertia control is simply a first‐order inertia loop and is implemented in the grid‐connected converter, the battery interfaced converter and the PMSG interfaced converter, respectively. The small‐signal model of the dc microgrid with the proposed inertia control is established. The range of virtual inertia control coefficient is determined through stability analysis. Finally, a typical dc microgrid is built and simulated in Matlab/Simulink, and the effectiveness of the proposed control strategy and correctness of the stability analysis are verified.