Abstract
This paper deals with the modeling and small-signal stability analysis of a dc-distribution electrical power system (EPS) sourced by a permanent magnet synchronous generator (PMSG). The topology employed here is one of the main candidates for future more electric aircraft (MEA). A detailed mathematical model is developed and comprehensive EPS modal analysis is performed. Eigenvalue sensitivity and participation factor are utilized to assess the effect of machine and control parameters, as well as system operating conditions, on EPS stability. Furthermore, this paper also presents comparative analysis of system models with and without the inclusion of system cabling. This crucial analysis shows that the tendencies in stability behavior can be significantly different with and without cabling. It is, therefore, shown that system simplification, by removal of cabling, can deliver remarkably misleading results. Time domain simulations are carried out to support the theoretical analysis. The comprehensive analysis presented in this paper provides EPS designers with an extremely useful methodology for the selection of appropriate EPS parameters at the early design stages.
Highlights
With increasing concern about environmental protection, the development of a “more electric” system to replace the conventional mechanical and hydraulic power for vehicles has become popular in recent years
This concept has been widely accepted in transportation including automotive, ship and aircraft power systems [1], [2] The electrical power system (EPS) is a hot topic for researchers in the more electric aircraft (MEA)
In [15], comprehensive modal analysis including participation factor and eigenvalue sensitivity analysis with respect to machine and control parameters is performed for a doubly-fed induction generator (DFIG)-based wind turbine system
Summary
With increasing concern about environmental protection, the development of a “more electric” system to replace the conventional mechanical and hydraulic power for vehicles has become popular in recent years. In [15], comprehensive modal analysis including participation factor and eigenvalue sensitivity analysis with respect to machine and control parameters is performed for a DFIG-based wind turbine system. The study of sensitivity provides useful guidance for analysis, planning, and operation of power systems It was successfully applied for optimal tuning of control parameters [17], [18], determining locations of compensating devices, for damping improvement and stability enhancement such as capacitor compensation and FACTS devices [14]. (2) Analysis of the impact on EPS stability of the key parameters (machine parameters, cable lengths, fluxweakening and DC current controllers, as well as operating parameters such as the generator speed and the load power) has been carried out through investigation into the system eigenvalues sensitivity and corresponding participation factors.
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