Publication: Active and reactive control for grid tied PV cell multilevel inverter
Loading...
Date
2024-07
Authors
Nurfaizah binti Abidin
Journal Title
Journal ISSN
Volume Title
Publisher
Abstract
Dependence on fossil fuels for a long time has exacerbated climate change and raised carbon emissions. Furthermore, fossil fuels are running out and will becoming very expensive very soon. As such, photovoltaic (PV) cell is highly recommended as it solves these problems. PV cells are used in many different applications because they produce energy with a significantly lower carbon dioxide emission. These applications include off-grid uses like powering remote telecommunications infrastructure, rural electrification projects, and outdoor lighting systems, as well as stationary power like home and commercial solar installations and utility-scale solar farms. When PV cell connections are made to utility grids, the power conditioning devices that act as a conduit between the PV cells and the grids must function appropriately in accordance with grid regulations. Additionally, compared to multilevel inverters, two-level inverters have some limitations in that they produce higher harmonic distortion and electromagnetic interference. In this work, a double-stage, grid-tied, three-level diode
clamped inverter that interfaces with a photovoltaic cell system is modelled. A 100kW/656.7V DC PV cell, a three-level diode clamped inverter with a nominal
voltage of 654.8V, and an inductance-capacitance-inductance (LCL) filter make up the system in addition to the grid. PV characteristics under MPPT method conditions which is perturb and observe (P&O) technique is used to extract maximum power from the PV string. The multilevel inverter's basic unit structure may convert DC power from the photovoltaic array to AC power to provide electricity to domestic loads or the utility grid. To evaluate the performance of the built system even further, two case studies depending on the load circumstances are taken into consideration. In a first scenario, the PV cell system produces enough energy to fulfil the load and exports the extra to the grid. In a second scenario, a 198kW load is connected to the output terminals of the grid-tied PV cell inverter. Given that the PV cell can only generate 100kW, the system imports electricity from the grid to fulfil the 198kW load. It is shown that the system can give and receive electricity from the grid. The results depict the system’s performance with a low total harmonic distortion (THD) of about 0.11% for the voltage and 4.5% for the current. The MATLAB SIMULINK 2023b environment is used for the design and simulation of the planned work.