Direct output voltage control of a STATCOM using PI controller based on multiple models

To solve the voltage control problem of the STATCOM, a PI control scheme based on multiple models is proposed in this paper. This control scheme combines the multiple models to the PI control. PI controller structure is applied, and the scheme has the advantage of simple structure, short calculate time and easy realization. Meanwhile, the method of multiple models is applied to meet the accuracy and speed of the voltage control. Simulation result shows that compared to the traditional PI controller, PI controller based on multiple models has a better ability to adapt to the change of voltage and a higher compensating precision.