Title :
DQ-transformation approach for modelling and stability analysis of AC-DC power system with controlled PWM rectifier and constant power loads
Author :
Areerak, K-N. ; Bozhko, S.V. ; Asher, G.M. ; Thomas, D.W.P.
Author_Institution :
Sch. of Electr. & Electron. Eng., Nottingham Univ., Nottingham
Abstract :
In this paper a technique for analysing aircraft frequency wild power systems with constant power loads is developed and demonstrated. Power electronic based loads often behave as constant power loads, especially when feeding machine or actuator drives under current and speed control. The constant power (CP) loads can affect the stability of the power system. The problem is a particular issue in aircraft power systems as the proportion of CP loads increases with the advent of the more-electric aircraft. This paper deals with stability analysis of a three-phase frequency-wild AC power system with a CP load fed through a vector-controlled front-end PWM converter. The mathematical model suitable for stability analysis is derived using the DQ-transformation method. It is shown how the proposed approach can be applied to study the power system behaviour under different loads and parameters variations, as well as to assess the power system stability margins. The study is supported by intensive simulations that verify the reported theoretical results.
Keywords :
AC-DC power convertors; PWM power convertors; PWM rectifiers; aircraft power systems; power electronics; power system control; power system stability; AC-DC power system stability analysis; DQ-transformation; PWM rectifier control; aircraft frequency wild power systems; power electronics; vector-controlled front-end PWM converter; Aerospace electronics; Aircraft; Control system synthesis; Power system analysis computing; Power system control; Power system modeling; Power system stability; Pulse width modulation; Rectifiers; Stability analysis;
Conference_Titel :
Power Electronics and Motion Control Conference, 2008. EPE-PEMC 2008. 13th
Conference_Location :
Poznan
Print_ISBN :
978-1-4244-1741-4
Electronic_ISBN :
978-1-4244-1742-1
DOI :
10.1109/EPEPEMC.2008.4635567