Abstract

Unified Power Flow Controller (UPFC) is the most prominent versatile FACTS controller applied in power system providing dynamic control of transmission line parameters. It can achieve Voltage regulation, series compensation and phase shifting independently. It provides combined advantages of STATCOM and SSSC by connecting two VSC’s with common dc coupling. Active power and reactive power can be directly controlled using UPFC. This paper presents UPFC for active power flow control through transmission lines. Control scheme based on d-q transformation is demonstrated. System studies are presented in MATLAB Simulink to present the active power flow control in the line.

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