Load flow management in the interconnected power systems using UPFC devices

The deregulation of electricity supply industry has introduced new opportunity for competition to reduce the cost and cut the price. It is a tremendous challenge for utilities to maintain an economical and reliable supply in such an environment. The PFAC program developed by authors to analyze the power flow in power systems with FACTS devices, has been tested on the 220 kV-400 kV network of the Romanian Power Grid. We have taken into consideration several possible scenarios, leading to two types of congestions: the first type is related to nodal power release, and the second to the supply of a deficit area. Simulations prove the fact that in both cases we can regulate power flow so that to reduce and eliminate congestions if we use the UPFC device.