Simulation of series and shunt compensated IPFC system

To achieve operational reliability and financial profitability more efficient utilization and control of the existing transmission system infrastructure is required. Mechanical switch based traditional approaches cannot realize full utilization of transmission system due to the needed large stability margin. Flexible alternating current transmission system (FACTS) is a power electronics based real time computer controlled technology provides needed corrections of transmission functionality in order to efficiently utilize existing transmission systems and therefore minimizing the gap between the stability and the thermal levels. Interline power flow controller (IPFC) is a voltage source converter (VSC) based FACTS controller for series compensation with the unique capability of power flow management among multi-lines of a substation. Basic principles of the IPFC simulated using PSPICE and discussed. Simulation results demonstrate the capability of IPFC to realize power balance in a transmission system with two identical lines and two non-identical lines. Regulation of the receiving end voltage of a transmission line terminating at a substation and linked up to the distribution network is at present implemented using the transformer tap changers, shunt compensators using elements-inductor(L) and capacitor(C) and synchronous condensers. They are slow with high wear and tear of moving parts. It is proposed to use IPFC for regulation of the receiving end voltage in series compensation and shunt compensation modes. IPFC to perform the voltage regulation at the receiving end of the line which is terminated at a substation to feed a distribution network simulated. Simulation results for both types of compensators series and shunt obtained. Results confirm the voltage regulation feature of the IPFC. Hence IPFC at a substation can function as a voltage regulator of a line.