An Optimal Power Flow control method of power system by Interline Power Flow Controller (IPFC)

The FACTS (Flexible AC Transmission System) devices have been considered as excellent controllers in a power system for better reliability and transmission capacity on a long-term and cost-effective basis. Interline Power Flow Controller (IPFC) is a new concept of the FACTS controller for series compensation with the unique capability of power flow management among multiple lines from a substation. Generally, the IPFC employs multiple dc-to-ac inverters providing series compensation for a different line respectively. As for the ability of controlling power flows on multiple transmission lines by using dc-to-ac inverters through common DC link, any inverters within IPFC are able to inject active power to the connected transmission line independently and thereby facilitate active power transfer among the lines, together with independently controllable reactive series compensation of each individual line. This paper proposes the utilization of this apparatus, for simplicity, which is applied to a test system, 6-machine 22-bus test system with Optimal Power Flow (OPF) control method to solve overload problem. The OPF control method for a satisfied solution of the minimum cost and the entire power flow balance is also discussed.