Stability Analysis of AC-DC Power System Feeding Paralleled Buck-Converter

Main Article Content

จุฑาทิพย์ กล้าสงคราม


This paper proposes stability analysis of AC-DC power system feeding paralleled controlled buck-converter. Normally, a controlled buck-converter behaves as a constant power load, that can affect the stability of system. Therefore, stability analysis is very important. In this paper, the proposed mathematical model is used with the Middlebrook’s criterion to predict the unstable point. The results are validated by the well-known Eigenvalue’s theorem and the simulation. Good agreement between the theory and simulation is achieved.

Article Details

How to Cite
กล้าสงคราม จ., “Stability Analysis of AC-DC Power System Feeding Paralleled Buck-Converter”, sej, vol. 15, no. 1, pp. 86–96, Apr. 2020.
Research Articles


A. Emadi, A. Khaligh, C.H. Rivetta, and G.A. Williamson, “Constant power loads and negative impedance instability in automotive systems: definition, modeling, stability, and control of power electronic converters and motor drives,” IEEE Trans. Veh. Technol., vol. 55, no. 4, pp. 1112-1125, Jul. 2006.

J. Mahdavi, A. Emadi, M.D. Bellar, and M. Ehsani, “Analysis of power electronic converters using the generalized state-space averaging approach.” IEEE Trans. on Circuit and Systems., Vol. 44, pp. 767-770, August 1997.

C. Rivetta, G.A. Williamson, and A. Emadi, “Constant power loads and negative impedance instability in sea and undersea vehicles: statement of the problem and comprehensive large-signal solution,” Proc. IEEE Electric Ship Tech Symposium., July 2005, pp. 313-320.

K-N. Areerak, S.V. Bozhko, G.M. Asher, and D.W.P. Thomas, “Stability analysis and modelling of AC-DC System with mixed load using DQ-transformation method.” In 2008 IEEE International Symposium on Industrial Electronics (ISIE08). Cambridge, UK, 2008 pp. 19-24.

R. D. Middlebrook, “Input filter consideration in design and application of switching regulators,” IEEE Industry Applicat. Soc. Annu. Meeting, 1976, pp. 366-382.

A. Emadi, “Modeling of power electronic loads in AC distribution systems using the genearlized state-space averaging method.” IEEE Trans. on Indus. Elect., vol. 51, no. 5, pp. 992-1000, Oct 2004.

A. Emadi, “Modeling and analysis of multiconverter DC power electronic systems using the generalized state-space averaging method.” IEEE Trans. on Indus. Elect., vol. 51, no. 3, pp. 661-668, Jun 2004.

X. Feng, J. Liu, and F. C. Lee, “Impedance specification for stable DC distributed power system,” IEEE Trans. Power Electron., vol. 17, no. 2, pp. 157-162, Mar. 2002.

T. Sopapirm, “Instability mitigation of a three-phase diode rectifier feeding a controlled buck converter by using the active damping method,” in 2018 21st International Conference on Electrical Machines and System, Jeju, 2018, pp. 745-748.

กองพัน อารีรักษ์, “ระบบควบคุม,” พิมพ์ครั้งที่ 1. นครราชสีมา : สำนักพิมพ์มหาวิทยาลัยเทคโนโลยีสุรนารี, 2560.

เทพพนม โสภาเพิ่ม, “การวิเคราะห์เสถียรภาพของระบบไฟฟ้ากำลังเอซีเป็นดีซีที่มีโหลดเป็นอิเล็กทรอนิกส์กำลังขนานกัน,” วิทยานิพนธ์ปริญญาวิศวกรรมศาสตรมหาบัณฑิต, สาขาวิชาวิศวกรรมไฟฟ้า, มหาวิทยาลัยเทคโนโลยีสุรนารี, นครราชสีมา, 2554.