A Peak Power Tracker for Low-power Permanent-magnet-synchronous-generator-based Wind Energy Conversion Systems

摘要

This paper presents the results of experimental investigation of a low-power wind energy conversion system (WECS), based on a permanent-magnet synchronous generator (PMSG) connected directly to the turbine. A test rig was built in order to carry out the experiments; its detailed description is also provided. The experimental results show that the performance of a low-power multi-polar-PMSG-based WECS is strongly determined by the generator's behaviour. Two optimal regimes characteristics (ORC) are defined in this paper: the first one represents the mechanical power versus the rotational speed (ORC_m) and the second one is the electrical power delivered to a load versus the rotational speed (ORC_e). An optimal control loop aiming to maximize the delivered electrical power is designed, namely its reference is computed based on the ORC_e. In this way, the global efficiency of the energy conversion is maximized. The effectiveness of the proposed optimal control loop is illustrated by experimental results.