TAP CHi KHOA HOC & CONG NGHE CAC TRlTCfNG DAI H ( ^ K I U NANG CAO KHA NANG KHAC PHyC LOI LlTdl KHONG D 6 I X T T N G CUA HE THONG PHAT DIEN CHAY BANG StTC GIO IMPROVING THE RESPONSE OF WIND POWER PLA[.]
TAP CHi KHOA HOC & CONG NGHE CAC TRlTCfNG DAI H ( ^ K I U NANG CAO KHA NANG KHAC P H y C LOI LlTdl KHONG D I X T T N G CUA HE THONG PHAT DIEN CHAY BANG StTC GIO IMPROVING THE RESPONSE OF WIND POWER PLANTS AGAINTS SYMMETRICAL AND UNSYMMETRICAL GRID FAULTS Nguyin Thj Mai Huffng, Bang Danh HoSng Nguyen Phung Quang Tnrdng Dai hoc Kv thugt Cong nghiep Thdi Nguyen Tru&ng Dgt hgc Bdch khoa Hd Noi Den Tda soan 27-8-2012, chap nhan dang 05-12-2012 TOM T A T Bdi bdo trinh bdy cdc kit qud nghidn ciru vi cdc bidn phdp nang cao khd ndng khdc phi^c l6i lu&i dit xirng vd khdng doi xirng cdc hd thdng phdt didn chay sire gid Khi xay loi Iw&i thi bg bien ddt phia mdy phdt dirac dieu khien ngirng Idm vigc, cdc ddy quin rotor dwac noi tat qua m& hd thong dign tr& tidu tdn dd tri qud trinh van hdnh ding bd cua mdy phdt v&i Iw&i phan phk Trong 66 hd biin ddi phia Iw&i dwgc dieu khiin de phdt cdng suat phdn khdng h5 trQ lu^i Cdc kit qud md phdng dwg>c thi/c hien mdi trwang Matlab - Simulink - Plecs cho thiy vigc dp dgng bidn phdp khdc phgc loi Iw&i ndi trdn da gidp cho hd thing c6 cdc ddp irng qud dd tit xdy l5i Iw&i d6i xii'ng va khong dii xu'ng ABSTRACT The paper presents the investigation results of methods to improve the response of wind power plants against the symmetrical and unsymmetrical grid faults During grid faults the generator-side inverter stops its operation and the rotor circuit will be connected with a damping resistance bank to detect the power electronics During this time the frontend-converter continues its controlled operation to generate the reactive power to maintain the grid The simulation results using Matlab - SimulinkPlecs prove that the mentioned methods would improve the grid response in cases with symmetrica! and unsymmetrical grid faults Keywords Wind power plant, doubly-fed induction generator, converter, unsymmetrical grid fault, ride-through capability TONG QUAN Ngay nay, cac he thdng tudc-bin gid hien dai thudng la cac he thdng cd tdc dp thay ddi su dung cac may phat khdng ddng bd ngudn kep (MPNK) Cac may phat dugc ndi vdi cac bp bien ddi d ca hai phia rotor va ludi Ben canh kha nang lam viec vdi dai bien thien toe ldn xung quanh Idc ddng bp thi mdt uu diem quan trpng ciia cac MPNK la d chd cac bp bien ddi chi can dam bao kha nang lam vi?c vdi khoang 30% cdng suat tdng cua may phat Dieu cho phep giam dugc dung lugng ciia cac bg bien ddi va gia cua toan bd he thdng [1][3] Tuy nhien, cac he thdng may phat siic gid sir dung MPNK cd nhugc diem la rlt nhay doi vdi cac nhieu loan ludi, dac biet la dien ap ludi giam tir O.l - 0.9 dan vj tuang ddi ciia dien ap ludi danh dinh khoang thdi gian tir 0.5 chu ky cho den phiil Hien tugng nhu vay cdn dugc gpi la sap ludi [4,5] Mpt cac giai passivity-based control, frontend phap de bao ve he thdng xay sap ludi la cat may phat khdi ludi Trong trudng hgfp nhu vay, he thdng tudc-bin gid khdng cd kha nang khdi phue lai l^p tuc tinh trang lam viec nhu liic trudc \a\ su cd va phai hoa ddng bd lai Mat khac, tdng dung lugng cua cac may phat sue gid he thdng phan phoi cang gia tang thi viec cat cac may phat khdi ludi mdt each khdng cd kiem soat co the cdn lam tdi te han tinh trang sap ludi cac may phat ngimg cung cSp dien nang cho luoi, Tham chi cdn cd the dan den viec lam mdt on djnh he thong ludi phan phoi [6],[7] Kht he thdng phan phdi bj sy cd sap lucfi se lam gia tang manh dong dien cac cupn day cua MPNK Do lien he giua tir trudng stator va rotor, ddng dien ldn se tac dpng vao mach rotor va bd bien ddi cd the dan den viec pha hdng bg bien ddi neu khdng cd cac bien phap bao ve bg bien ddi Mgt nghien ciiu [8] da chi rang MPNK chju tac ddng ciia nhieu dien ap luai se gay dao dpng T^P CHI KHOA HQC & CONG NGH$ cAC TRlTCfNG DAI HOC KV THUAT * S6 92 - 2013 Ciia tir thdng may Khi cac nhilu loan dd xuat hien bd bien ddi se gia tang dien ap rotor de khdng che ddng di?n cua nd Khi dien ap yeu cau vugt qua kha nang gidi han ciia bd bien ddi thi viec dieu khien ddng se khdng cdn tac dung [9,10] Vi vay, he thdng dieu khiln c§n tri Iam viec va giam dao ddng cang nhieu cang tot sudt thdi gian cd Idi ludi Mat khac, h? thdng can phai dugc tai lap dn dinh cang sdm cang tdt het ldi ludi [11] Cac phucmg phap didu khien try ludi cac tai lieu [9],[12]-[14] sir dung mdt bg ngat qua dien ap (BNQDA) la cac dien trd tieu tan cd dieu khien bdi cac thyrlstor Khi dien ap mdt chieu tmng gian tang cao hoac dien ap ludi giam xudng den mpt mirc nao dd thi BNQDA tac ddng Bd bien ddi phia may phat se ngung lam viec va cac day quan rotor cua may phat dugc ndi kin mach qua he thdng dien trd tieu tan Nhu vay, qua trinh Idi ludi MPNK dugc sii dung nhu mdt dgng ca khdng ddng bd rotor day quan Trong dd bp bien ddi phia ludi dugc dua vao lam viec sudt thdi gian ludi bj sy cd de hd trg ludi Tuy nhien, hau het cac nghien ciiu chua de cap den viec dieu khien bd bien ddi phia ludi (BBDPL) de bu Idi ludi ludi bi su cd khdng ddi xirng Vi vay, viec nghien ciiu van de try ludi xay Idi ludi khdng ddi xiing la mdt yeu cau can thiet CAU TRUC DIEU KHIEN Bai bao chu yeu trinh bay cac van de lien quan den sach luge dieu khien bg bien ddi phia ludi de nang cao kha nang khac phue Idi ludi Vi vay phan tiep theo se chi de cap den cau triic dieu khien phia ludi Chi tiet ve cau tnic dieu khien phia may phat cd the tham khao [18] _\-Kll; \ -IB, •o, KIK\ rv4 01 L 1/iJ' •[;;] I (\ + ~A t C I (o]R]C]+(o]R^RfC]+o)lL^cA O)]R]C} ^ 6)IR]C]+\ u^ va i^ la cac dien ap va ddng dien ciia bg bien ddi phia ludi, u„ va i^ la dien ap va ddng ludi, i , Cj va RJ la dien khang, tu dien va dien trd cua mach Igc, R^ la dien trd cua cudn khang L^ va if la ddng chay qua nhanh song song ciia bd Ipc 2.2 Cau true dieu khien phia ludi He thdng dieu khien phia ludi nham muc dich tri dien ap mdt chieu trung gian va cdng suat phan khang d cac gia trj mong mudn Cau tnic dieu khien phia ludi cd hai mach vdng (hinh 1) Mach vdng vdi bd dieu khien phia ludi dugc gpi la mach vdng dieu khiin ddng ludi Myc tieu cua viec thiet ke bd dieu khien ddng ludi la de dat dugc dap iing bam nhanh theo cac ddng dien ludi dat trudc Kd ^^ ',^ • Mach vdng ngoai vdi bp dieu khien kieu PI dugc su dung de diiu khien dien ap mdt chieu trung gian Iheo tin hieu dat UDC' va cdng suat phan khang giira ludi va bg bien ddi thdng qua gde he sd cdng suat