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Robust Tracking Control with Integral Action for DMC-UPFC System

To improve the dynamic performance and robustness for the direct matrix converters operating as unified power flow controllers (DMC-UPFC), a robust tracking controller based on state feedback with integral action is proposed. Firstly, a 6th order mathematical model for series side of DMC-UPFC is presented, which can be designed as the robust tracking controller through carrying out an appropriate coordinate transformation and state variable feedback. Next, the quadratic optimal control strategy is utilized to select feedback gain matrix and obtain the optimal control law, which can be applied to complete the design of robust controller. Compared with the conventional proportional integral control, the proposed robust tracking control with integral action can achieve great reference tracking performance and rejection of constant disturbances. Finally, the effectiveness and rationality of the robust controller can be validated through simulations in two-bus low-voltage power transmission network.