Polyphased modular direct-drive wind turbine generator

Abstract

The goal of the paper is to study the possibility of increasing the power capability of direct-drive PM wind generators with respect to the established quality criteria: electromagnetic torque and the power trasferred to the grid. The studied solution is a polyphased system with a phase number multiple by 3, i.e. a multi-star system. The influence of the number of stars and their phase shift are investigated. -KeywordsWind generator systems, penranent magnet synchronous motor, multiphase drive LOB 2005 -I2'rc.xkn 0.1 llolyplasr,d rvlodular DiLwt-Diive Wind Turbrinc: Ociv-rttc-r BRISET $St4lle DEl 2005 -L)i--;c11i ISBN :90-75815-08-5 1>q1

The state of the art of wind energy conversion systems and technologies: A review

“…Scheme of the WECS based on the SS-PMG. [113]. Besides, the fault tolerant capability of multi-phase machines is better than traditional three-phase machines.…”

Modelling approaches for an asymmetrical six-phase machine

“…Examples can be found in [12][13][14][15]. It can be shown that all the modelling approaches described in [10][11][12][13] yield exactly the same results as those obtained with the so-called Vector Space Decomposition (VSD) approach, which was introduced in [16].…”

“…All the different transformation matrices for multiphase machines rely on the fact that the initial set of equations of a multiphase machine can be rearranged in the form of the equations of (n−1)/2 (for odd; (n/2−1) for even phase numbers) mutually independent subspaces or submachines [11], with the remaining component(s) representing zero sequence. In this manner, control of each of the submachines becomes simple and control of all of them leads to control of the original multiphase machine.…”

A Review of Methods to Increase the Availability of Wind Turbine Generator Systems

“…[144] describes an AC drive with multiple independent phase driving units. For wind turbines, such a multiple phase system with nine phases constructed with classical three phase converters was described in [145].…”