摘要

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 15kV. This paper investigates the use of IPFC, which are dc/ac converters linked by common DC terminals, in a DG-power system from an economy perspective. By using a probabilistic approach, it can be shown that the power ratings of parallel active power filters used in the IPFC are considerably reduced from those of the deterministic approach, when reliability is not compromised. Analytical predications, and experimental measurements at a 15kV substation fed by a number of wind generators, confirm the validity of the proposed approach.