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Evaluation of rotor speed stability margin of a constant speed wind turbine generator

DSpace at IIT Bombay

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Title Evaluation of rotor speed stability margin of a constant speed wind turbine generator
 
Creator KANABAR, MG
KHAPARDE, SA
 
Subject constant speed (squirrel cage) induction generators
grid codes
rotor speed stability
wind turbine generating system
 
Description Many developing countries like India have installed large number of constant speed wind turbine generators (WTGs) as they are robust and economical. Most of the countries have their own grid codes (rules and regulations) to integrate WTGs into the utility grid. One of the primary grid code for WTGs is low voltage ride through (LVRT) capability. The regulations of grid integration are likely to make LVRT requirements mandatory for WTGs with high penetration level. To demonstrate LVRT capability, a WTG has to remain connected to the grid at a specific low voltage and for a specific duration. Generally, a constant speed WTG does not sa LVRT requirements. This is because during a nearby fault the rotor accelerates to a very high speed, and hence the WTG becomes unstable. This phenomenon is referred to as rotor speed instability. To satisfy LVRT requirements, the rotor speed stability margin of a constant speed WTG has to be improved. One of the methods to meet the LVRT requirements is by providing additional reactive power support which can improve the terminal voltage during a disturbance. This, in turn, will increase the electromagnetic torque and hence, the rotor acceleration can be reduced. This paper presents an evaluation of rotor speed stability margin to obtain critical slip and critical clearing time of a constant speed wind turbine generator. For this analysis, analytical formulae have been presented to determine the exact amount of additional reactive power support required to meet the LVRT capabilities. For a sample system, using simulation of the dynamic model in SIMULINK, it has been shown that the analytical value of reactive power is indeed able to make the WTG comply with the LVRT requirements.
 
Publisher IEEE
 
Date 2011-10-26T00:17:03Z
2011-12-15T09:12:14Z
2011-10-26T00:17:03Z
2011-12-15T09:12:14Z
2008
 
Type Proceedings Paper
 
Identifier 2008 JOINT INTERNATIONAL CONFERENCE ON POWER SYSTEM TECHNOLOGY (POWERCON) AND IEEE POWER INDIA CONFERENCE, VOLS 1 AND 2,1186-1191
978-1-4244-1763-6
http://dspace.library.iitb.ac.in/xmlui/handle/10054/15856
http://hdl.handle.net/100/2546
 
Source Joint International Conference on Power Systems Technology (POWERCON)/IEEE Power India Conference,New Delhi, INDIA,OCT 12-15, 2008
 
Language English