• Asmar Asmar Department of Electrical Engineering University of Bangka Belitung


The stability of the electric power system is related to the balance of power in the system. When a power change occurs, the rotor will swing affecting the power angle, rotation speed, frequency and stability of the system. The Unbalanced load causes the momentary power of the generator to contain the sinusiodal component. To know the effect of sinusiodal component, must be known relation between power angle with momentary power. The relationship is determined by the symmetric component method. The power angle relationship with the momentary power obtained is applied to the swing equation. With the linearization of the equation, it can be seen the effect on steady state generator stability. The results showed that an increase in load imbalance caused a decrease in the stability limit.

Keywords: unbalanced load, symmetrical component,instantaneous power, steady state stability


Download data is not yet available.

Author Biography

Asmar Asmar, Department of Electrical Engineering University of Bangka Belitung

Lecturer Department of Electrical Engineering University of Bangka Belitung


[1] A. von Jouanne dan B. B. Banerjee, “Voltage Unbalance: Power qualityissues, related standards and mitigation techniques,” Electric Power Research Institute, Palo Alto, CA, EPRI Final Rep., May 2000
[2] R. Bergeron, “Voltage Unbalance On Distribution Systems—Phase I,” Canadian Electrical Association, Montréal, Québec, Project no. 231 D 488, Jan. 1989
[3] M. H. Hesse and J. Sabath, “EHV Double-Circuit Untransposed Transmission Line-Analysis And Tests,” IEEE Trans. Power App. Sys., vol. PAS-90, issue 3, pp. 984-992, May 1971
[4] M. Chindris dkk, “Propagation of Unbalance in Electric Power Systems“, Electrical Power Quality and Utilisation, Oktober 2007
[5] P. Paranavithana dkk, “Propagation Of Voltage Unbalance From Hv To Mv Power Systems”, 20th International Conference on Electricity Distribution Prague, 8-11 June 2009
[6] H. Saadat, “Power System Analysis,” McGraw-Hill, Singapore, 1999
[7] W.J. Bonwick dan P.J. Hession,”Fast Measurement Of Real And Reactive In Three Phase Citcuits”, IEE Proc-A, Vol. 139, Maret 1992
[8] O. Usta dan M. Bayrak, “A New Digital Algorithm For Protection Of Synchronous Generators Against Unbalanced Fault Conditions”, Large Engineering System Conference on Power Engineering, Halifax, Canada, Juni 1999
[9] M. Bayrak dan O. Usta, “Instantaneous Power In Unbalanced Three Phase System,” ELECO’99 International Conference on Electrical and ElectronicaEngineering,1999
[10] P. Kundur, “Power System Stability And Control”, McGraw-Hill, New York, 1994
[11] Asmar dkk, “Kecepatan Putaran Dan Frekuensi Generator Pada Kondisi Beban Tidak Seimbang”, Media Elektrika, 2014
[12] W. D. Stevenson, “Analisis sistem tenaga listrik,” Erlangga, Jakarta, 1993
[13] R.A. Gabel dkk,”Sinyal dan sistem linear”, Erlangga, 1996
[14] J. Machowski dkk.,“Power system dynamics,” John Wiley & Sons,.Ltd, United Kingdom,2008
Abstract viewed = 99 times
PDF (Bahasa Indonesia) downloaded = 270 times