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TAP CHi KHOA HQC I& CONG NGHE CAC TRU''''ONG hAHIQC KY TEIUAT * St̂ 86 2012 SYNCHRONIZATION AND POWER FLOW CONTROL OF DFIG FOR WIND ENERGY SYSTEM DIEU KHIEN HOA DONG BQ VA DONG CONG SUAT CUA DFIG TRONG H[.]
TAP CHi KHOA HQC I& CONG NGHE CAC TRU'ONG hAHIQC KY TEIUAT * St^ 86-2012 SYNCHRONIZATION AND POWER FLOW CONTROL OF DFIG FOR WIND ENERGY SYSTEM DIEU KHIEN HOA DONG BQ VA DONG CONG SUAT CUA DFIG TRONG HE THONG N A N G H 'ONCi GIO Phan Quoc Dzung, i\guyen Bao Anh, Le Minit Phuong, Le Dinh Khoa Ha Chi Minh University ofTevlinology Received October 31 "•' lU 11 TOM TAT Bai bao trinh bay cac thuat toan d4 diSu khi4n bo bi§n doi phia rotor (RSC) cua he thong may phat cam t/ng ngudn k^p (DFIG) bao gdm giai thu$t dieu khiSn tru-c ti4p cdng suat (DPC) de di&u khiSn dong cong suit va giai thu$t dtiu khien (rue tiep moment (DVTC) de hda ddng bd DFIG vao twoi Trong ci hai giai thuat tren, cdc khdi diSu chinh ti le • tich phan d6u khong dux?c siy dung Ban chat cua hai thuat toan la chon Iwa vector dien ap thich hap clio bd bi4n doi phia rotor K4t qua thiK nghiem tren mdy 1,5 kW duxyc trinh bay, su dijng phan mdm MATLAB/SiMUUNK va vi di6u khiSn DSpace 1103 ABSTRACT This paper presents algorithms for controlling rotor-side converter (RSC) of a double-fed induction generator (DFIG) system including direct power control (DPC) strategy for controlling power flow and direct virtual torque control (DVTC) strategy for synchronizing DFIG with grid There is no proportional-integral (PI) regulator in both of strategies The essence of two strategies is selection of appropnate voltage vectors on the rotor-side converter The experimental results on a 5'kW machine are explained using MA TLAB/SIMULINK together DSpace 1103 Keyword Direct Power Control (DPC), Direct Virtual Torque Control (DVTC), Direct Torque Control (DTC), Artificial Neural Network (ANN), Doubly-Fed Induction Generator (DFIG), Rotor-side converter (RSC), Gnd-side converter (GSC) Nomenclature vg (grid voltage), is (stator current), ir (rotor current), 9r (rotor angle) H'g 4's (grid and stator flux), 4^9 Tv (rotor flux and virtual torque), Ps Qs (active and reactive power), Lm (mutual inductance) Ls Lr (stator and rotor inductance), Rs Rr (stator and rotor resistance), p (pole pairs), w (frame speed), wr (rotor speed), tos (synchronous speed) I INTRODUCTION , _ , , , In recent \cars fossil fuel is exploited and used more and more, this leads to the , exhaustion of fossd fuel and the a.r pol ution by greenhouse gas So, human are researching and developing new technologies to use the types of renewable energy Among the types of renewable energy, wind energy is applied in large power plans such as large wind farms Wind turbine technology can be divided into fixed speed category (generally with squirrel-cage induction generator) and variable speed one (with doubly-fed induction generator) For many wind farms, wind turbines based on doubly-fed induction generator (DFIG) with converters rated at 25% - 30% of the generator rating are used DFIC-based wind turbines have many advantages when compared to wind turbines using fixed speed induct''^" generatoib, which are variable ;.peed operation four-quadrant active and reactive power ^apabiliues, lower converter costs and louer |^^^^^ [,j ^ ,