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Voltage phase angle jump characteristic of DFIGs in case of weakgrid connection and grid faultXinshou TIAN 1,2 , Gengyin LI 1 , Yongning CHI 2 , Weisheng WANG 2 ,Haiyan TANG 2 , Xiang LI 2Abstract In the condition of connecting large scaledoubly-fed induction generators (DFIGs) into weak grid,the closely coupled interactions between wind generatorsand power grid becomes more severe. Some new faultcharacteristics including voltage phase angle jump willemerge, which will inf l uence the power quality of powersystem. However, there are very few studies focusing onthe mechanism of voltage phase angle jump under gridfault in a weak grid with wind turbine integration. Thispaper focuses on the scientif i c issues and carries outmechanism studies from different aspects, includingmathematical deduction, f i eld data analysis and timedomain simulation. Based on the analysis of transientcharacteristics of DFIGs during the grid fault, this paperpoints out that the change of terminal voltage phase anglein DFIGs is an electromagnetism transition process, whichis different from conventional synchronous generator.Moreover, the impact on transient characteristics of volt-age phase angle are revealed in terms of fault ride through(FRT) control strategies, control parameters of currentinner-loop of rotor-side converter and grid strength.Keywords DFIGs, Weak grid, Fault ride through,Voltage phase angle jump1 IntroductionWind power has experienced a rapid development dur-ing the past 15 years, and the total installed capacity ofwind power has reached 114.6 GW by the end of 2014 inChina [1]. ‘‘Centralized development and long-distancetransmission’’ is the outstanding characteristic of windenergy development in China. Therefore, most wind farmsare located at the end of the power grid, and the electricalconnection between wind generators and power grid isweak. Grid disturbance will cause complex transient pro-cess of wind turbines [2]. A key problem for reliability andsecurity of power grid is how to accurately evaluate thetransient characteristics of wind turbines and its impacts ontransient stability of power system when large scale windturbines are connected into weak grid [3].DFIGs not only improve the energy conversion eff i ciencygreatly, but also reduce the mechanical stress of the primemover.Itcouldimprovethecontrolcapabilityandstabilityofpower system, and becomes one of the commercial windturbines with successful operation [4, 5]. In order to enhancethe transient stability of power systems, FRT has become thebasic requirements for wind farms [6]. However, whenCrossCheck date: 16 December 2015Received: 24 August 2015/Accepted: 21 December 2015/Published online: 18 February 2016? The Author(s) 2016. This article is published with open access atSpringerlink.com& Xinshou TIANtianxinshou@epri.sgcc.com.cnGengyin LIligy@ncepu.edu.cnYongning CHIchiyn@epri.sgcc.com.cnWeisheng WANGwangws@epri.sgcc.com.cnHaiyan TANGtanghy@epri.sgcc.com.cnXiang LIwishx@126.com1State Key Laboratory of Alternate Electrical Power Systemwith Renewable Energy Sources (North China Electric PowerUniversity), Changping District, Beijing 102206, China2China Electric Power Research Institute, Haidian District,Beijing 100192, China123J. Mod. Power Syst. Clean Energy (2016) 4(2):256–264DOI 10.1007/s40565-015-0181-4