Control of a Wind Farm Connected to the Grid at a Frequency and Variable Voltage

Wind energy is characterized by fluctuation because of a main intermittent source, which can damage the stability of the electrical network which leads to an imbalance between production and consumption. To resolve this difficulty, an integration of a micro-grid based on a wind farm interconnected to the electricity grid is proposed which presents the first objective of this paper. The two-level inverter is so much used in this domain, but the main limitations of this solutions are the fact that the voltage output presents high ripples and that this inverter is not a practical solution for applications with high power. Thus, the second aim of this paper consists in using a multicellular inverter. The main unit of this farm is based on a three permanent magnet synchronous generators which are entrained by three aero-generators. This unity is connected to a DC bus through three controlled rectifiers. The obtained power is injected to the electricity grid using a multicellular inverter as well as an inductor and resistor filter. The three generators and the proposed inverter are controlled through a vector control. A theoretical study of the suggested farm is parented and simulated using a Matlab/Simulink environment. The obtained simulation results confirm the approach robustness.