Design of grid-connected microgrid system and its harmonic analysis using MATLAB

In a typical solar photovoltaic (PV) system, a solar photovoltaic array is used to generate electricity and a DC/DC converter is used to boost the voltage. The maximum power point tracker (MPPT) is used to make the photovoltaic array work at the maximum power extraction point in the power voltage characteristics of the photovoltaic array. There is a grid-connected inverter for DC/AC conversion and an output voltage controller to maintain synchronization with the grid. In addition to this, the output filter at the terminals of the grid-connected inverter and the DC link capacitor on the DC bus must be designed to filter out the higher harmonics generated by the switching of the inverter.

insert image description here
insert image description here

Photovoltaic panel selection

Photovoltaic arrays consist of photovoltaic modules connected in series or parallel, each module consisting of individual solar cells connected in series. A typical arrangement of a solar photovoltaic array is shown in the figure

Solar photovoltaic array layout
MATLAB Simulink has a PV panel model that includes a library of commercial solar PV panels. It includes nameplate data and PV characteristics for irradiance and temperature variations. For this design, we chose the Canadian solar (CS6X-310P) model, and it has a wide range of output voltages. The main features of this module are shown in the table below

insert image description here

PV string size calculation

Maximum module voltage corrected for lowest ambient temperature in the field.

Guess you like