Excitation control method based on wide-area measurement system for improvement of transient stability in power systems

In this paper, we propose a novel excitation control method for synchronous generators (SGs) for improvement of transient stability in power systems. The proposed excitation system controls the excitation voltage based on a wide-area measurement system (WAMS). An energy function for the power system was adopted as a stability index, and we designed a control system to promote a decrease in the energy function after a disturbance. Numerical simulations were carried out for a multi-machine power system. The results show that the proposed WAMS-based stabilizer (WBS) improves the first swing stability and enhances the damping of the subsequent oscillation, whereas the conventional power system stabilizer (PSS) does not necessarily improve the first swing stability. It is also noteworthy that the WBS has few parameters that need to be tuned, unlike the PSS.