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Digital Control and MBPC design for DC Voltage Regulation in a Grid-Connected PV Microgrid

Abstract:

The demand and acceptance of photovoltaic (PV) plants have increased steadily in remote agricultural areas of Ecuador, and the design of solar-powered microgrids (MG) provides a solution on these remote sites. The present paper explains the design of a control system used in an MG, based on classical and advanced automatic control techniques, applied to a three-phase inverter connected to a solar array with an irradiance study of the area for its installation. In the first instance, mathematical modeling of the MG inverter is presented. Also, including the design of other electronic components, such as grid filters and a direct current voltage boost converter, to tune two types of controllers, based on digital control and model based pbkp_redictive control (MBPC), to regulate the alternating voltage given by the MG. A comparative analysis of the performance of both controllers was done, using MATLAB/SIMULINK®, and it was shown that the advanced controller gave a faster response, a lower overvoltage in the MG, and a stabilization of voltage.