Harmonic Reduction of Doubly Fed Induction Generator Connected To the Grid

Transcription

1 P (pu) 24 IJEDR Volume 2, Issue 2 ISSN: Hrmoni Redution of Douly Fed Indution Genertor onneted To the Grid Jdv Pnkj, 2 elim Firdus, P.G. Student (Eletril System), 2 P.G. Student (Eletril System) Eletril Engineering Deprtment, V.V.P. Engineering ollege, Rjkot, Indi jdv.pnkj2@gmil.om, 2 firdus.ele@gmil.om strt Now dy penetrtion of renewle energy soures is inresing dy y dy nd wind energy system is leding in ll this. DFIG with two levels /D/ onverter is used with one s rotor side onverter nd other s the grid side onverter. Rotor side onverter ontrols the voltge nd frequeny of the DFIG wheres the grid side onverter is there to ontrol the D link voltge. The min prolem of the DFIG is hrmoni s it ontin two onverter.to ontrol the hrmoni onstnt instntneous power ontrol strtegy is used to ontrol the hrmonis. Index Terms DFIG, /D/ ONVERTER, FILTER, MTL I. INTRODUTION Greenhouse gs redution hs een one of the ruil nd inevitle glol hllenges, espeilly for the lst two dedes s more evidenes on glol wrming hve een reported. This hs drwn inresing ttention to renewle energies inluding wind energy. With inresed penetrtion of wind power into eletril grids, DFIG wind turines re lrgely deployed due to their vrile speed feture nd hene influening system dynmis. This hs reted n interest in developing suitle models for DFIG to e integrted into power system studies. The ontinuous trend of hving high penetrtion of wind power, in reent yers, hs mde it neessry to introdue new prties. DFIG when used in the wind turine then they mintin the mplitude nd the frequeny of their output power to e onstnt. The reltion etween the mehnil power nd the wind speed is given y p = performne oeffiient = ir density =swept re (m 2 ) V=wind speed () s the speed of the wind hnges ording to it the mehnil power hnges nd similr to it the eletril power lso hnges. Figure shows the grphil reltion of the wind speed nd the mehnil power in the per unit vlue..5 Wind Turine hrteristis (w =.2 pu, pith ngle inreses y step of 2 deg.) Wind speed (m/s) Fig.: Reltion etween mehnil power nd wind speed DFIG sttor is diretly onneted to the grid nd the rotor is onneted to the grid using /D/ onverter. In whih there re two onverters re used to ontrol the frequeny nd voltge of the DFIG. Rotor side onverter (RS) is diretly onneted to the rotor of the DFIG. RS ontrol the voltge nd the frequeny of the DFIG.GS (grid side onverter) is used to mintin the D link voltge onstnt. IJEDR4228 Interntionl Journl of Engineering Development nd Reserh ( 29

2 24 IJEDR Volume 2, Issue 2 ISSN: Qs Ps /D/ onverter rotor Turine D grid Pg Qg Vr Vg Rotor ontrol Sttor Indution genertor Threephse Grid Pith ngle Fig.2: flow digrm of the DFIG II. ROTOR SIDE ONVERTER The tul voltge nd urrent is mesured nd ompred with the referene voltge nd the error is trnsmitted to the PI ontroller tht gives the diret xis referene urrent. From the turine power hrteristi urve we n mesure the power P r nd from the line voltge nd the urrent we get the P nd line losses P loss re dded. The error signl is nother PI ontroller whih give us the qudrture xis referene urrent nd from this we trnsfer error signl from it to the urrent ontroller (PI) whih give us the V r. Vref V voltge mesurement V PI ontroller (voltge mesurement) I Drop of Xs Vx Idr_ref Ir urrent mesurement Idr Wr V I trking mesurement P Pr ontroller Iqr Iqr_ref urrent ontroller Vr Vdr nd Vqr Wr Is nd Ir losses Ploss I Fig.3: RS ontrol Strtegy III. GRID SIDE ONVERTER The Grid side onverter is used to regulte the D link voltge. For the gridside ontroller the dxis of the rotting referene frme used for dq trnsformtion is ligned with the positive sequene of grid voltge. IJEDR4228 Interntionl Journl of Engineering Development nd Reserh ( 29

3 24 IJEDR Volume 2, Issue 2 ISSN: VD_ref VD D voltge ontroller Id_gs_ref Igs urrent mesure Id_gs urrent ontroller Vg Iq_gs Iq_ref Fig. 4: RS ontrol Strtegy. mesurement system mesuring the d nd q omponents of urrents to e ontrolled s well s the D voltge Vd. 2. n outer regultion loop onsisting of D voltge Regultor. 3. n inner urrent regultion loop onsisting of urrent Regultor. The urrent regultor ontrols the mgnitude nd phse of the voltge generted y onverter grid (Vg) from the Idg_ref produed y the D voltge regultor nd speified Iq_ref referene. The urrent regultor is ssisted y feed forwrd terms whih predit the grid output voltge. IV. FILTER DESIGN Shunt tive filter onsist of two min lok. The PWM onverter 2. The tive filter ontroller PWM onverter is responsile for power proessing in synthesizing the ompensting urrent tht should drwn from the power system. tive filter ontroller is responsile for signl proessing in determining in rel time the instntneous ompensting urrent referenes, whih re ontinuously pssed to the PWM onverter. Fig.5: si onfigurtion of shunt tive filter Instntneous power lultion lok lulte the instntneous power of it. ompensting seletion lok determine the ehvior of the shunt tive filter or it selets the prts of the rel nd imginry power of the system tht should e ompensted y the shunt tive filter. D voltge regultor determine n extr mount of rel power, represented y P loss tht use n dditionl flow of energy to the D pitor in order to keep its voltge round fixed referene vlue. IJEDR4228 Interntionl Journl of Engineering Development nd Reserh ( 292

4 s s s s 24 IJEDR Volume 2, Issue 2 ISSN: Fig. 6: Shunt tive filter ording to the [3] the hrmoni present in the DFIG is nerly equl to the 44.3 %. With the use of the shunt tive filter (onstnt instntneous urrent ontrol) we get the hrmoni nerly equl to the 4.2 % V. SIMULTION OF DFIG USING SHUNT TIVE FILTER Simultion shows the DFIG with its ontrol strtegy nd filter. Turine nd Drive Trin W_wt (pu) [Pith_deg] Pith ngle (deg) Tt (pu) T_wt (pu) W_wt (pu) Wind (m/s) Wind speed (m/s) Wind Turine Genertor speed (pu) Drive Trin T_shft (pu) K se for the Genertor [Tm] WoundRotor Indution Genertor [V_] [Tm] Tm m [synm_sig] 2 3 synhronous Mhine pu Units Filter Q=5 D onverter verge Model hoke [V_grid_onv] [I_grid_onv] [V_] [I_sttor] [I_grid_onv] [I_rotor] [Vd_V] 2 Wind Turine ontrol V_ Utrl_grid_onv I_sttor I_grid_onv Utrl_rotor_onv I_rotor Vd_V Pith_deg Qref [Utrl_grid_onv] [Utrl_rotor_onv] [Pith_deg] Port Port5 Port3 Port2 Port6 Port4 FILTER _grid_onv V_g V_g V_r V_r [V_rotor] Vnom_r/Vnom Z=% _rotor_onv Qref_pu [ngle_rotor_rd] [synm_sig] ngle_rotor_rd PQ_pu wr ontrol <Rotor speed (wm)> <Rotor ngle thetm (rd)> <Sttor urrent is_ (pu)> <Sttor urrent is_ (pu)> <Sttor urrent is_ (pu)> <Rotor urrent ir_ (pu)> <Rotor urrent ir_ (pu)> <Rotor urrent ir_ (pu)> <Eletromgneti torque Te (pu)> [PQ_pu] [ngle_rotor_rd] [I_sttor] [I_rotor] [Tem] [Utrl_grid_onv] [Utrl_rotor_onv] [I_grid_onv] [I_rotor] V_g Uv g_grid_onv V_g Uv g_rotor_onv V_r I_grid_onv _pu V_r I_rotor_pu Vd onverter verge model [Vd_V] Outputs [V_] V_sttor_pu [I_sttor] I_sttor_pu [V_rotor] V_rotor_pu [I_rotor] I_rotor_pu [V_grid_onv] V_grid_onv _pu [I_grid_onv] I_grid_onv _pu [Vd_V] Vd_V wr_pu (IG speed) [TurineSpeed] TurineSpeed_pu [Tm] Tm_pu [Tem] Tem_pu [PQ_pu] PQ_pu [Pith_deg] Pith_deg m Fig.7: Simultion of DFIG with filter. Simultion result of the voltge nd urrent IJEDR4228 Interntionl Journl of Engineering Development nd Reserh ( 293

5 Mg (% of Fundmentl) urrent (PU) Voltge (PU) 24 IJEDR Volume 2, Issue 2 ISSN: Time. Hrmoni ontent of the dfig with the filter Fig.8: Simultion result of DFIG Seleted signl: 5 yles. FFT window (in red): 5 yles Time (s) 8 Fundmentl (5Hz) =.536, THD= 4.2% Hrmoni order Fig.9: Hrmoni ontent of the DFIG VI. ONLUSION s disussed the douly fed indution genertor hs ility to ontrol the voltge nd frequeny s well s it mintins the voltge nd frequeny onstnt. In DFIG /D/ two onverters re there one rotor side onverter nd other grid side onverter. Rotor side onverter ontrols the tive nd retive power while the grid side onverter mintins the D link voltge onstnt. In the simultion of DFIG hrmoni ontin of [3] is redued from the 44.3% to the 4.2%. REFERENES [] Omr Noureldeen ehvior of DFIG Wind Turines with rowr Protetion under Short iruit Interntionl Journl of Eletril & omputer Sienes IJESIJENS Vol: 2 No: 3 June 22 [2] Wei Qio, Ronld G. Hrley Effet of Gridonneted DFIG Wind Turines on System Trnsient Stility 28 IEEE IJEDR4228 Interntionl Journl of Engineering Development nd Reserh ( 294

6 24 IJEDR Volume 2, Issue 2 ISSN: [3] R.Rjrjn, Mr.P.rvindn Mximum Extrtion in Grid onneted DFIG Using 3 Level Diode lmped Inverter 22 Interntionl onferene on omputing, Eletronis nd Eletril Tehnologies [IEET] [4] doulye Mmdie Syll, Mmdou Lmine Doumi Mximum ontrol of Gridonneted DFIGsed Wind Systems 22 IEEE Eletril nd Energy onferene [5] Hyong Sik Kim, Dyln Dhhun Lu Review on Wind Turine Genertors nd Eletroni onverters with the Gridonnetion Issues [6] J. L. Elizondo, M. E. Mís, nd O. M. Miheloud Mtrix onverters pplied to Wind Energy onversion Systems, Tehnologies nd Investigtion Trends 29 Eletronis, Rootis nd utomotive Mehnis onferene [7] shwni Kumr, Snjy K. Jin Review on the Opertion of Grid Integrted Douly Fed Indution Genertor Interntionl Journl of Enhned Reserh in Siene Tehnology & Engineering, ISSN: Vol. 2 Issue 6, June23, pp: (2537) [8] JiHeon Lee, JongKyou Jeong, yungmoon Hn, NmSup hoi nd HnJu h DFIG Wind System with DDPWM ontrolled Mtrix onverter Journl of Eletril Engineering & Tehnology Vol. 5, No. 2, pp. 299~36, 2 [9] S. Ji, X. Wng nd K.J.Tseng Mtrix onverters for Wind Energy Systems 27 IEEE [] K.Ghedmsi, D.ouzellg, E.M.erkouk pplition of Mtrix onverter for Vrile Speed Wind Turine Driving n Douly Fed Indution Genertor 26 Interntionl Symposium on Eletronis, Eletril Drives, utomtion nd Motion [] Yulong Li, NmSup hoi rrier sed Pulse Width Modultion for Mtrix onverters /9/29 IEEE IJEDR4228 Interntionl Journl of Engineering Development nd Reserh ( 295