Determination of IPFC operating constraints in power flow analysis

• Flexible AC Transmission System (FACTS) controllers have been widely used.
• Power flow controller (IPFC) is a versatile member of FACTS devices.
• A simple modeling with strategies for handling all operating constrains of IPFC.
• The developed is validated using IEEE 30-bus and IEEE 118-bus test systems.

In recent years, the Flexible AC Transmission System (FACTS) controllers have been widely used to enhance the controllability, security and flexibility in power transmission networks. Interline power flow controller (IPFC) is a versatile member of FACTS devices that can be used to control the power flow in multiple lines in network. Modeling of IPFC with handling its operating constraints is an important issue to determine the practical capabilities of this device. This paper presents a simple modeling with strategies for handling all operating constrains of IPFC in Newton–Raphson (NR) load flow algorithm. The various operating constraints such as; the injected series voltages, injected line currents passing through the converters and exchanged powers among the series converters are investigated. The developed IPFC model with these constraints is validated using standard IEEE 30-bus and IEEE 118-bus test systems.