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In this paper real, reactive power and voltage balance of the UPFC system is analyzed. Two important results related to UPFC control has been obtained. First, it is indicated that the shunt converter provides all the required reactive power during the power flow changes if the UPFC bus voltage is constant. Second, the UPFC bus voltage can be controlled both from the sending side and from the receiving...
A pair of back-to-back power electronic inverters can control the real and reactive power flow in a transmission line. This configuration is called a unified power flow controller (UPFC). This paper presents a control strategy based on d-q axis theory for the operation of a UPFC. A new decoupling control strategy for the series converter and coordination control for the shunt converter is tested with...
In this paper the voltage balance, real power balance and reactive power balance of a UPFC system are analyzed. It is interesting to find that when the UPFC bus voltage is stable as power flows changing any increase/decrease in the transmission line reactive power due to in-phase component of the series voltage injected by the series converter causes an equal increase/increase in the shunt converter...
This paper presents a modified coordination control scheme for a UPFC. The basic control strategy is such that the shunt converter of the UPFC controls the transmission line reactive power and the DC link capacitor voltage. The series converter controls the transmission line real power flow and the UPFC bus voltage. Real, reactive power and voltage balance of the UPFC system is analyzed. Two important...
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