Excitation Control Based Energy-Shaping with Direct Mechanical Damping Injection for Transient Stability Improvement of Power Systems

In this paper, a novel energy-shaping design method is provided for excitation controller of power systems, which is carried out by directly injecting the compensation damping into the mechanical damping. This design method utilizes the transient energy function with the physical properties of power system, and the adjusted parameters of the designed controller have directly corresponding relation to the physical meaning of the mechanical damping and electrical damping of power system. In addition, to further enhance the transient stability, considering the possible variation in the transmission line and uncertainties in physical parameters, an adaptive excitation controller is also designed by employing the direct mechanical damping injection. It is shown that the proposed excitation controller can make the system have better dynamic properties and large stability margin even in the case with the permanent fault on transmission line and the turbine failure. And, for illustrating the effectiveness of the proposed controller, the simulation comparison results with the traditional energy-shaping approach are presented.