Title :
Control system for vertical-axis WECS
Author :
De Almeida, Bruno R. ; Oliveira, Demercil S., Jr.
Author_Institution :
Dept. of Electr. Eng., Fed. Univ. of Ceara, Fortaleza, Brazil
Abstract :
This paper introduce the design of a static converter for a vertical-axis wind energy conversion system (WECS), based on permanent magnet generators. This turbine presents low speed and high torque, characteristics that will be explored in the converter project. The proposed topology, formed by a high frequency semi-controlled rectifier and a step-down dc-dc converter, realizes the turbine´s maximum power point tracking (MPPT) and protects battery from surge and over current. The principal advantages of using the semi-controlled rectifier are: simplicity, since all active switches are connected to a common point, robustness, as short-circuit through a leg is impossible to happen and high efficiency due to reduced number of elements. One disadvantage is the high total harmonic distortion (THD) produced; nevertheless, its value is in an acceptable range. A system overview, the vertical-axis wind turbine characteristics, the power generator, the power converter and control system are presented. Simulation results are compared with experimental results from a 1.5 kW laboratory prototype.
Keywords :
angular velocity control; harmonic distortion; machine control; maximum power point trackers; permanent magnet generators; power generation control; synchronous generators; voltage control; wind power plants; wind turbines; MPPT; control system; high frequency semicontrolled rectifier; permanent magnet generator; power 1.5 kW; static converter; step-down DC-DC converter; total harmonic distortion; turbine maximum power point tracking; vertical axis WECS; vertical axis wind energy conversion system; Batteries; Control systems; Rectifiers; Topology; Torque; Voltage control; Wind turbines; Battery charging; WECS; high frequency semi-controlled rectifier; maximum power point tracking algorithm; vertical-axis turbine;
Conference_Titel :
Power Electronics Conference (COBEP), 2011 Brazilian
Conference_Location :
Praiamar
Print_ISBN :
978-1-4577-1644-7
Electronic_ISBN :
2175-8603
DOI :
10.1109/COBEP.2011.6085273