Diseño, construcción e implementación de un generador fotovoltaico para el sistema a escala del laboratorio de Sistemas Eléctricos de Potencia

Abstract

In this degree work, the design, construction and implementation of a photovoltaic generator that consists of two stages is developed: the first one is the control stage that is responsible for the execution of an MPPT algorithm, a current control loop and a PLL that allows the generator to be synchronized with the grid. The second is the power stage that is composed of a three-phase inverter, whose design is based on optocouplers, gate drivers and IGBTs.

The system also consists of an LCL low-pass filter that is designed in order to reduce the harmonic voltage content at the output of the inverter and a coupling transformer that, in addition to being the second inductance of the filter, also allows raising the voltage obtained in the inverter output to local grid levels.

The control system is developed on the TMS320F28377S board from Texas Instruments, using the DC and AC measurements obtained by the voltage and current sensors.

To check the correct operation of the system, tests are carried out on the connection to the grid and in an isolated way, feeding different types of loads. Active power injection, reactive power delivery and absorption tests are also carried out.