Renewable Energy Combined Unified Power Flow Control in Transmission Line

This paper presents a particular inter harmonic control method of using photovoltaic sun powered homestead inverter as Photovoltaic Unified Power Flow Controller (PV-UPFC), for improving stable force move restricts and remunerating the reactive power of the interconnected transmission system. A typical inverter is utilized for both sun based yield DC-AC transformation and UPFC consecutive Voltage Source Converter (VSC) process.By the use of UPFC both real and reactive power can be controlled and voltage profile is maintained. Selective inter harmonic compensation is introduced to improve performance of the line. The approach is based on the Park transform typically adopted for Statcom control. The improvement is obtained by selective interharmonic filter. The Unified Power Flow Controller is a combination of STATCOM (Static Synchronous Compensator) and SSSC (Static Synchronous Series Compensator). It is generally represented by two back to back voltage source converter (VSC) connected through DC capacitor link. A STATCOM is a voltage source converter (VSC) based device, which having voltage source behind a reactor. The voltage source is made from a DC capacitor and thus a STATCOM has little or no active power capability. It is a shunt controlling device. The SSSC is a series controlling FACTS device that is used to control real power flow and improve power oscillation damping on the power grid. It injects voltage in series with the transmission line where it is connected. The proposed system having the advantage that rather than using separate inverters for solar DC-AC conversion and UPFC converter operation, a standard inverter is employed. This can be achieved through connecting the solar farm DC output terminal across the UPFC DC capacitor link there by reducing the number of inverter required. This tends to increase the stable power transfer limits and enhance the transient stability in the power transmission system.