S.A. Al-Qallaf and S.A. Al-Mawsawi and A. Haider, Comparison of Fundamental Frequency Model and PWM Based Model of UPFC. journal = {International Journal of Electrical and Computer Engineering}, [online]. World Academy of Science, Engineering and Technology. September 2014, vol. 94(10). 1592 - 1595 [viewed 21 September 2024]. Available from: https://publications.waset.org/pdf/9999533.