Title :
Dynamic Consideration of DC Microgrids With Constant Power Loads and Active Damping System—A Design Method for Fault-Tolerant Stabilizing System
Author :
Magne, Pierre ; Nahid-Mobarakeh, B. ; Pierfederici, S.
Author_Institution :
MacAUTO, McMaster Univ., Hamilton, ON, Canada
Abstract :
It is known that constant power loads (CPLs) can yield instability in dc-power systems under certain operating conditions. This instability phenomenon is due to the interaction between the dc-grid and the negative input impedance characteristic of the CPLs. Dynamic behavior and stability analysis of a dc-microgrid with CPLs is presented in this paper. Then, a method to design a fault-tolerant stabilizing system for a dc-microgrid with CPLs is presented. It consists in implementing a local stabilizing agent on each CPL. Then, a method to design the stabilizing system is proposed. The method is based on the definition and resolution of a constrained optimization problem. It permits to consider several fault scenarios, such as the electrical reconfiguration of the dc-microgrid, or the failure of an agent. To illustrate the method´s effectiveness, it has been implemented and experimentally tested on a test bed.
Keywords :
damping; distributed power generation; fault tolerance; optimisation; power system stability; CPL; DC microgrids; active damping system; constant power loads; constrained optimization problem; dc-power systems; fault-tolerant stabilizing system; instability phenomenon; local stabilizing agent; negative input impedance characteristic; Fault tolerance; Fault tolerant systems; Microgrids; Power system stability; Stability criteria; Voltage control; Active damping; fault-tolerance; microgrids; multiagent system; stability;
Journal_Title :
Emerging and Selected Topics in Power Electronics, IEEE Journal of
DOI :
10.1109/JESTPE.2014.2305979
