Controller design for advanced reactive power compensators based on input-output linearization

This paper presents a reactive power compensator for electric power systems, which consists essentially of a self-commutated inverter and a nonlinear controller. This compensator permits the regulation of power system voltage by compensating reactive power with desired transient performance. The design of the control system is based upon the "input-output linearization technique". Such a control system enables global stabilization of the compensation system and thus helps to significantly improve the transient performance of the global system. The control system is simulated using simplified models as well as more sophisticated models for inverters in order to validate the controller performance.