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This paper describes the simulation and testing of a low power wind system including a vernier reluctance magnet machine (VRMM), used as a direct-driven generator. The aim is to propose the design and control of the electrical part of a domestic wind power installation. We want in particular investigate the benefits and limitations due to the use of the VRMM in this system. This characteristic has led the Region to support projects concerning wind energy, notably for domestic installations of low power range (about 10 kW). The LEM tries therefore to bring improvements in this type of wind energy conversion chains, including horizontal or vertical axis turbines. Our work focuses especially on the generator and its association with AC/DC converters. We first present the structure and working equations of the VRMM and the AC/DC converters associated with it. Equations used to model VRMM and PWM rectifier in a d,q rotating frame are then detailed. A Simulink model of the system including the wind turbine is proposed. We show simulation results : we compare two methods used to drive the VRMM in order to reach the maximum power point of the turbine. 2. The energy conversion chain A. Utilization of produced energy In order to support innovation in wind energy, French electricity national supplier EDF purchases electricity produced by wind turbines at attractive prices : even for low power installations, it can be more interesting to sale produced energy rather than to use it directly. For this reason, we foresee a grid connection of the power system. Independently of these financial aspects, low power wind turbines are meant for autonomous utilization, especially in locations where grid can not be installed. A storage system, essential for this application, must therefore be associated with the system. The design of a test bench is also presented. In this one, the wind turbine is emulated by a DC machine. The drives of the DC machine and of the VRMM are realized with the help of a D-Space board. With this bench, we study the association of VRMM with two different AC/DC converters. We finally foresee the later developments of the system.

Wind Power System for Domestic Installations