Implementation and  verification of
LVRT function of MW class DFIG

LIU Jie，TANG Qiu

(College of Electrical and Information Engineering,Hunan University,Changsha 410082,China)

Received:2015-12-28 Revised:2016-03-17 Online:2017-10-25 Published:2017-10-25

Abstract:

The stable operation of the wind turbines of the doubly fed wind power generation (DFIG) system can be

affected when the grid voltage drop occurs. On the basis of previous studies’ results, we propose a circuit

based on the dynamic braking resistor (DBR)to solve the low voltage ride-through (LVRT) problem. We first

introduce the low voltage ride through function module of WT2000 MW class DFIG system. Then we carry out

system simulations by using the Matlab/Simulink, and perform field measurements on a WT2000 MW class DFIG

system. The results show that the system can respond to the fault and activate discharge devices in short

time so as to maintain the safe working condition when the voltage drop occurs. The proposal conforms to the

national standard of GB/T 19963-2011 “Technical Requirements of Wind Farm Access Power System”.

Key words: DFIG(doubly fed wind power generation), low voltage ride-through, DBR(dynamic braking resistor), WT2000

LIU Jie，TANG Qiu.

Implementation and verification of

LVRT function of MW class DFIG

[J]. Computer Engineering & Science.

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