Diseño y comparación mediante simulación de controladores PI y SMC aplicados a un inversor trifásico conectado a la red.

Abstract

This work presents the design and comparison by simulation of PI and SMC controllers applied to a three-phase inverter connected to the grid. It starts from the DC/AC concepts and its main components such as: inverter, modulation techniques, synchronization techniques with the grid, filters and finally the study of control techniques.

In the design phase, a three-phase inverter with SPWM modulation is modeled, it continues with the design of an optimal LCL filter, then, the design of the synchronization technique with the grid SRF-PLL, concluding with the design of the PI and SMC controllers.

Each one of the system components are implemented in Simulink from Matlab and the designs are validated. Next, tests of the operation of the controllers are carried out through the simulation of injection of active and reactive power to the grid, as well as of real disturbances that exist in the grid (voltage dips), always verifying through THD measurements that the injected current corresponds to the limits imposed by IEEE519 standard for harmonic current limits. Finally, an analysis of the performance of the controllers is carried out, through the comparison of various parameters