%0 Journal Article
%T A Dynamic Reactive Power Control for DFIG Wind Turbines andIts Impacts on Distribution Protections
%J 电力系统自动化
%D 2012
%X With the increasing penetration of distributed generations（DGs）into power grids，the fault ride-throughability of DG is attracting more and more attention.Recent grid codes require a DG to maintain its connection withthe grid during grid faults and to play an active role in the recovery of grid voltage.This paper chooses the doubly- fed induction generator（DFIG）as the typical wind turbine for study.Firstly，a dynamic reactive power controlstrategy is proposed to improve the fault ride-through characteristic of a DFIG.The contributions of a DFIG to thefault current under the dynamic reactive power control and the Crowbar control are analyzed and compared based onthe mathematical expressions and control behaviors.The impacts of a DFIG under two control strategies ondistribution protections are discussed.Studies show that although a DFIG under the dynamic reactive power controlprovides more fault current component than one under the Crowbar control，its impacts on distribution protectionsare acceptable.Finally，a10kV distribution network with a DFIG is simulated in PowerFactory DIgSILENT.Thesimulation results prove the correctness of above theoretical analysis
%K doubly-fed induction generator（DFIG）
%K fault ride-through
%K short-circuit current
%K distribution network
%K doubly-fed induction generator（DFIG）
%K fault ride-through
%K short-circuit current
%K distribution network
%U http://www.aeps-info.com/aeps/article/abstract/201201039?st=article_issue