You need JavaScript to view this

Investigation of torque control using a variable slip induction generator

Abstract

An investigation of the possibilities of using a variable slip induction generator to control wind turbine transmission torque has been carried out. Such a generator consists of a wound rotor induction generator with its rotor winding connected to an external variable resistance circuit. By controlling the external resistance, the torque-slip characteristic of the generator can be modified, allowing efficient, low-slip operation below rated wind speed and compliant, high-slip operation above rated, where the additional losses are of no consequence but the resulting compliance allows a much reduced duty to be specified for the transmission and gearbox. A number of hardware options have been investigated for the variable resistance rotor circuit, the main options being either a rectifier and DC chopper or an AC regulator. Both of these options use semiconductor switching devices, for which the relative merits of thyristors, MOSFETs, GTOs and transistors have been investigated. A favoured scheme consisting of an AC regulator using GTOs has been provisionally selected. This choice uses some non-standard equipment but is expected to give negligible problems with harmonics. A comprehensive simulation model has been set up and used to investigate the behaviour of the whole system. (author).
Publication Date:
Jul 01, 1991
Product Type:
Technical Report
Report Number:
ETSU-WN-6018
Reference Number:
SCA: 170602; PA: GB-92:051400; SN: 92000752625
Resource Relation:
Other Information: PBD: 1991
Subject:
17 WIND ENERGY; WIND TURBINES; TORQUE; CONTROL SYSTEMS; INDUCTION GENERATORS; COMPUTERIZED SIMULATION; PERFORMANCE; DESIGN; COST; HARMONICS; VALIDATION; 170602; TURBINE DESIGN AND OPERATION
Sponsoring Organizations:
UK Department of Energy, Renewable Energy Research and Development Programme, Energy Technology Support Unit (ETSU), (United Kingdom)
OSTI ID:
10147205
Research Organizations:
Wind Energy Group Ltd., Southall (United Kingdom)
Country of Origin:
United Kingdom
Language:
English
Other Identifying Numbers:
Other: ON: DE92524813; TRN: GB9251400
Availability:
Commercial reproduction prohibited
Submitting Site:
GB
Size:
87 p.
Announcement Date:

Citation Formats

Bossanyi, E A, and Gamble, C R. Investigation of torque control using a variable slip induction generator. United Kingdom: N. p., 1991. Web.
Bossanyi, E A, & Gamble, C R. Investigation of torque control using a variable slip induction generator. United Kingdom.
Bossanyi, E A, and Gamble, C R. 1991. "Investigation of torque control using a variable slip induction generator." United Kingdom.
@misc{etde_10147205,
title = {Investigation of torque control using a variable slip induction generator}
author = {Bossanyi, E A, and Gamble, C R}
abstractNote = {An investigation of the possibilities of using a variable slip induction generator to control wind turbine transmission torque has been carried out. Such a generator consists of a wound rotor induction generator with its rotor winding connected to an external variable resistance circuit. By controlling the external resistance, the torque-slip characteristic of the generator can be modified, allowing efficient, low-slip operation below rated wind speed and compliant, high-slip operation above rated, where the additional losses are of no consequence but the resulting compliance allows a much reduced duty to be specified for the transmission and gearbox. A number of hardware options have been investigated for the variable resistance rotor circuit, the main options being either a rectifier and DC chopper or an AC regulator. Both of these options use semiconductor switching devices, for which the relative merits of thyristors, MOSFETs, GTOs and transistors have been investigated. A favoured scheme consisting of an AC regulator using GTOs has been provisionally selected. This choice uses some non-standard equipment but is expected to give negligible problems with harmonics. A comprehensive simulation model has been set up and used to investigate the behaviour of the whole system. (author).}
place = {United Kingdom}
year = {1991}
month = {Jul}
}