Grid-connected hybrid renewable energy system using DFIG and multilevel inverter

摘要

The objective of this work is to study the performances of hybrid system comprising wind and photovoltaic sources with battery storage. The grid integration of the PV system is carried out via a three phase three level neutral point clamped (NPC) inverter. The interface of connection to the electrical supply network consisted of a continuous bus, filters RL, the regulation of the powers and the management of the system will be described. This interface will make it possible to function in network connected with an automatic commutation The control strategies of the sources are based on power, voltage and current control with Maximum Power Point Tracking (MPPT). This control will enable us to inject the power activates desired and to regulate the voltage at the point of connection with grid, and to impose the voltage and the frequency in separate network. The proposed energy management strategy has been simulated. Numerical results are presented and discussed, showing the effectiveness of the proposed hybrid system.