Photovoltaic Grid-Connected with Transformerless Renewable Source System with Multilevel NPC Inverter

Abstract

Nowadays, multilevel NPC inverters have obtained popularity with high power ratings. Photovoltaic solar panels, fuel cells, wind turbines and similar renewable energy sources can be combined into a multilevel converter system. The strength of the wind, liberal paths of energy in nature, can be tackled by conversion of wind energy system collected of a wind turbine, electrical and electronics system control corresponding system. In research used permanent magnet synchronous generator. Ac grid linked by wind energy with a load. The loads in a grid might be harmful to nature. Hence, the injection of unbalance current into renewable grid should be avoided since these Negative sequence currents and harmonic currents will cause an unwanted improvement of the current line.Dealing with problems is to use effective controllers with multilevel inverters. A multilevel inverter handed down to improve THD. In this case, a nine-level and an eleven-level inverter are used for the set the values of voltage increment and THD decrease with 12.87% to 4.38%. Powers is a limitation of stabilization of DC and the power of reactive is close to unity. Low capacitors filter to eradicate the harmonics presence in the system.For the performance evaluation of the approaching for a modelling of the AC grid, non-linear load, multilevel inverter and renewable energy resources (e.g., wind power generation) was developed in a MATLAB/ SIMULINK environment.