KHOA HQC CONGNGHE Q PHAN TICH GlA BIEN NUT CUA LlTdl DIEN 220 - 0 kU MIlN BAC iflET NAM 2011 Iran Bach Vien Dien-Ggi hgc Bdch Khoa Hd Not Le Quang Hai Khoa Phdng Chdy-Dgi hoe Phdng Chdy Chda Chdy Tom tdt: Bai bdo nay, dp dung phuang phap c(d/MWh) tinh toi Lfu he thong dien de nghien ctfu gid bien nut cua ludi dien 220-500 kV mien Bac nam 2011 Gidi thieu Gii bien nut la xuat t i n g sin xuat hoac xuat tang gia mua MWh cdng suat tai mdt nut nhat djnh-d/MWh [1,2] Nha s i n xuat dien nang chao gia ban dien tdi thieu cho lupng cdng suat nhat djnh khoang thdi gian nhat djnh, vi du gid bat dau tQ thdi diem t hdm sau Tdng hpp g i i thau b i n cua tat c i cic nha sin xuat ta cd ham g i i thau b i n eb=f(g) nhU tren hlnh a, g la edng suit b i n c2 cgd c1 TDb P1P2 Pgd P ' p r P(MW) Hlnh Hdm gid thdu bdn vd mua Tuong t u ngUdi mua dien dUa g i i thau mua, la g i i mua tdi da cho lupng cdng suat nhat djnh Ta thay, neu lay g i i giao djch l i ci thi ngUdi mua sin khoing thdi gian nhat djnh.Tdng hpp cie g i i thau mua sang mua PI' MW, nhung ngudi b i n chi ban PI MW, nen ta dupc ham g i i thau mua cm=f{d) tren hinh l b , d la giao djch chung la PI MW edng suit mua Neu lay g i i la e2 thi ngUdi ban san sang b i n la P2' MW, cb cm nhung ngUdi mua chi cd the mua P2 MW, nen giao djeh (d/MWh) (a/MWh) chung l i P2 MW cb3 cml cm2 cb1 cm3 g1 g2 g3 gmaxg(MW) a) dl d2 d3 dmax d(MW) b) Neu lay g i i giao djch la cgd thi ngUdi mua va b i n gap d cdng suit Pgd (g=d) v i g i i (cb=em), edng suit Idn hon PI va P2, nhU vay edng suat giao djch la Idn nhit, nhieu khich hang dUpc cung cap dien nhat, dd g i i giao djch dupc gpi la g i i giao dich hpp ly nhat dupe c i ben b i n va mua chap nhin Hlnh Ham gid thau bdn (a) vd gid thau mua (b) Khi giao djch theo g i i hpp ly, ngudi mua dupe mua re hon g i i hp ed the mua, phan gpi la t h i n g dU mua Di de trinh b i y dudi day ta thay cic h i m g i i thau TDm NgUdi b i n cung b i n dupe cao hon g i i hp cd the mua v i g i i thau b i n bang cic dudng t h i n g b i n , phan n i y gpi la thing dU b i n TDb g i i hpp ly tdng Tren cO sd gia thau ban va g i i thau mua, q u i n ly sin t h i n g dU ban va t h i n g dU mua la Idn nhat hay la Ipi ieh xa giao djeh se djnh g i i giao djch hpp ly nhat (CP-clear hdi Idn nhat price) NgUdi b i n v i mua giao djch theo g i i [1,2] Cdng viec eua q u i n ly sin giao djch chinh la xic dinh Tr#n hlnh 2, gia thau b i n v i g i i thau mua dupe d i t tren cung mdt hlnh g i i giao djeh hpp ly Gii giao djch hpp ly d tQng nut khic nhau, gpi la g i i bien nut Dien A Ddi song 17 S KHOA HQC - CONG NGHE Mo hinh bai toan phan bo cong suat toi Uu-OPF tinh gia bien nut Dieu hanh thj trUdng dien giii bai toan tdi Uu trUde mdt tQ cic g i i thau nhin dQpc Bai t o i n OPF cd hai nhiem vu: 1-CUe tieu ehi phi cung cap dien; 2-Dim b i o eung cap dien tdi da ed the cho phu t i i Phu tai dung cang nhieu dien ning thi hp dat dupe cang nhieu Ipi ich sQ dung dien nang Vi the neu yeu cau dien n i n g khdng dQpc dap Qng het thi se gay tdn that ve Ipi ich NhQ vay ham mue tieu cua bai t o i n OPF dQpc gpi la ham Ipi ich xa hdi vi nd nham muc dich cQc tieu h o i ham ehi phi tdng v i dd eUc dai h o i Ipi fch x i hdi (hay Ipi fch xa hdi tdi Uu) 2.1 Dfnh nghia bam Igi ich xa hgi A >max(i) -P ^ gmm