Large-Signal Stability Assessment of AC/DC Systems with Multi-Pulse Rectification and DC-Fed PWM Motor Drives

This paper analyzes the large signal stability in an AC/DC system with a controlled AC generator and a regulated load of constant power characteristic. The method used in the analysis is based on Lyapunov direct method. The required Lyapunov function is constructed by means of solving a set of linear matrix inequalities derived from the system. Therefore, the models of the system components become relevant in the formulation and are also analyzed. In the Lyapunov based study it is desired that these models are simple, but represent the nonlinear and energy-flow behavior of the original equipment. Computer simulations are used along the paper to illustrate the discussion and support the validity of the proposed approach.