Interline power flow controller - properties and control strategy in dynamic states

High-power electronic converter topologies, in such forms as Unified Power Flow Controllers (UPFC), Static Compensators (STATCOM) and Interline Power Flow Controllers (IPFC), have been used to enhance and optimize the use of transmission facilities, under the concept of a flexible ac transmission system (FACTS). In Europe, the anticipated proliferation of distributed-generation (DG) in the near future, driven by governmental initiatives and the European Commission's Framework Programs, has prompted new interests in the reliability and economy of power delivery and interconnection at the lower sub-station level of medium voltage. This paper investigates the control structure and use of IPFC, which are dc/ac converters, linked by common DC terminals, in a medium voltage DG-power system. Results of simulation investigations are presented to validate proposed approach.