Transient Instability Reduction in High Voltage Transmission Line Using Unified Power Flow Controller (UPFC)

Abstract

In Kampala metropolitan High voltage ring network, there is a constant growth of electrical power demands, particularly non-linear loads from the development of industrial parks and the coming up of new industries. [1] [2] Due to this growth in demand, the existing transmission network operates at the margin of its capacity and experience the problem of transient voltage instability, which leads to inconsistency in transmission. [3] Power System Stability must be maintained under any circumstances to have an uninterrupted power supply. UPFC (Unified Power Flow Controller) has more control variables, compared with the other FACTS (Flexible Alternating Current Transmission Systems) devices, it can change a variety of power system parameters during operation, making the power system run more flexible hence providing a more advanced solution to power system transient stability. [4] The general objective of this project is to model and evaluate the impact of Unified Power Flow Controller on the reduction of transient voltage instability of Kampala metropolitan High Voltage ring Network. The project was conducted as a case study of the Kampala Metropolitan High Voltage Ring Network, it covered 132 kV voltage level. It involved creating the Kampala Metropolitan High Voltage ring network model and UPFC model and performing analysis before and after installation of the UPFC model on Kampala Metropolitan High voltage Ring Network. The research found out that Kampala Metropolitan High voltage ring network is operating at the margin of its capacity and that UPFC provides very good voltage regulation, extension transmission line loadability, has an excellent reduction of transient on a transmission line and it’s a financially viable solution to inflexible condition on the High voltage network