Abstract
Problem statement: The Phillips-Heffron model of a power system with UPFC published by AJAS, demonstrates the effect of the UPFC in improving power system oscillation stability. Unfortunately, some of the equations have not been correctly derived and so working with this model in its existing form is misleading. Approach: In this study, the model is revisited and the equations are re-derived obtaining correct results. Three-machine power system installed with a UPFC is used to investigate the validity of these equations. Results: The simulation results demonstrated that the corrected model with an effective controller is active on damping of the low-frequency oscillations under different operating conditions. Conclusion: The corrected model works properly with power system networks for enhancing power system stability.
Highlights
Simplicity and ease of application of Phillips-(Meshkatoddini et al, 2009)
The I1E and IE2 are derived and listed in matrix form as: Heffron model has encouraged many researchers to use this model in representing the power system with FACTS devices
In its current form this model cannot properly represent power system networks installed with a UPFC and need to be corrected
Summary
(Meshkatoddini et al, 2009). The I1E and IE2 are derived and listed in matrix form as: Heffron model has encouraged many researchers to use this model in representing the power system with FACTS devices VE VB (Meshkatoddini et al, 2009) to develop the non-linear dynamic model of multi-machine power system with UPFC. In its current form this model cannot properly represent power system networks installed with a UPFC and need to be corrected. The low-frequency oscillations is demonstrated by using the corrected model and the results are compared with model presented by (Meshkatoddini et al, 2009). Dynamic model of multi-machine power system with a UPFC: The dynamic model of an n-generator installed with a UPFC is derived in reference. The [Y31 Y31] in C , FE and FB must be changed to [Y31 Y32 ] in order to correspond with actual value
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