Study on the influence of short-circuit current characteristics of a doubly-fed wind farm on distance protection and protection strategy
DOI：10.19783/j.cnki.pspc.190594
Key Words:doubly fed induction generator  Crowbar protection  RSC control  traditional distance protection  time-domain distance protection
Author NameAffiliationE-mail
FAN Xiaohong Kunming University of Science and Technology, Kunming 650500, China  
SUN Shiyun Kunming University of Science and Technology, Kunming 650500, China  
ZHANG Xuejuan* Kunming University of Science and Technology, Kunming 650500, China 982328600@qq.com 
ZHENG Xinyu* Kunming University of Science and Technology, Kunming 650500, China  
WANG Yang* Kunming University of Science and Technology, Kunming 650500, China  
ZHAO Wei* Kunming University of Science and Technology, Kunming 650500, China  
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Abstract:At present, studies on the influence of short-circuit current characteristics of a doubly fed induction generator on distance protection of wind farm feeder lines and related research are generally carried out on the basis of taking Crowbar protection action into account. There is little literature considering the influence of short-circuit current characteristics of DFIG on distance protection under the control of Rotor-Side Converter (RSC). Thus this paper analyses the difference of short-circuit current characteristics of doubly fed induction generator considering Crowbar protection operation and RSC control operation. The expressions of calculation deviation of the speed-frequency component and transient natural component for full-cycle Fourier algorithm considering Crowbar protection operation and RSC control are deduced and analyzed. The purpose is to analyze the influence of short-circuit current from doubly-fed wind farm on traditional distance protection. Also a time-domain distance protection method adapted to two operating conditions after fault is proposed. Finally, the electromagnetic transient simulation model of grid-connected doubly fed induction generator is built on the platform of Matlab/Simulink. The operational characteristics of traditional distance protection and time-domain distance protection are simulated and analyzed considering Crowbar protection action and RSC control. This work is supported by National Natural Science Foundation of China (No. 51367009).
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