ABSTRACT
In last few decades the demand of electricity grownup drastically. Due to higher demand and aging of networks it is indispensable to control the power flow in transmission systems. The flexible AC Transmission system (FACTS) provides effective control over one or more transmission system parameters to enhance controllability and increase power transfer capability. UPFC is one of the most powerful FACTS devices which can simultaneously control all the parameters of the system i.e., the line impedance, transmission angle and bus voltage. This paper presents a device called Distributed Power Flow Controller (DPFC) which is derived from the UPFC by eliminating common DC link. It is most recent and one of the ultimate device within the FACTS family. The DPFC has control capacities of all the parameters of the transmission network. With DPFC the active power exchange between the shunt and series converter is done through the transmission line by the 3rd harmonic current. It is designed with multiple single phase series converters (D-FACTS) and one three phase shunt converter. The DPFC has more control capability at much reduced cost and improves reliability.
This work presents modelling of a damping controller based on ‘Generalized Theory of the Instantaneous Active and Reactive Power’ proposed by Akagi commonly known as P-Q theory, the simulation results demonstrate parameters like, compensating current flowing through controllers, and active power flow.
