Reducing power system oscillations using HVDC links

The fast development of renewable energy has resulted in expansion of power system. Transmitting large amount of power over long distance will lead to the increase in inter-area oscillation. To deal with this potential problem, it is essential to design a new type of power oscillation damping (POD) controller. Currently, HVDC systems have become very popular in transmitting bulk power over long distance. In addition to the main function of HVDC system: power transmission, the flexibility and controllability may bring other benefits to power system stability. This project investigates the feasibility of designing a HVDC-based POD controller. In this project, conventional power system stabilizer structure has been used to design the HVDC-based POD controller. The proposed POD controllers have been tested in two systems: Kundur’s two-area system and GB system. The damping ratio for inter-area mode in GB system has been improved to 12.50% after implementation of the proposed POD controller. Moreover, investigation of different input to the proposed POD controller has been carried in Kundur’s two area system.