psdc12 (2)
DESCRIPTION
modellingTRANSCRIPT
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Review of Basic Synchronous MachineEquations
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Va
Vc
Vb
−Vf
h
g
Direction of
Rotation
d − axis
kf
q − axis
Synchronous machine model - 2 pole
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Flux-Current Relationship
The stator and rotor flux linkages are given by
ψs = [Lss]is + [Lsr]ir
ψr = [Lrs]is + [Lrr]ir
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where
iTs = [ia ib ic], ψTs = [ψa ψb ψc]
iTr = [if ih ig ik] ψTr = [ψf ψh ψg ψk]
[Lss] = [Lss]T
[Lrr] = [Lrr]T
[Lrs] = [Lsr]T
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[Lss
]=
Laao Labo LaboLabo Laao LaboLabo Labo Laao
+ Laa2×
cos 2θ cos(2θ − 2π/3) cos(2θ + 2π/3)cos(2θ − 2π/3) cos(2θ + 2π/3) cos 2θcos(2θ + 2π/3) cos 2θ cos(2θ − 2π/3)
θ : Electrical Angle = P
2 θm
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[Lrr
]=
Lf Lfh 0 0
Lfh Lh 0 0
0 0 Lg Lgk
0 0 Lgk Lk
![Page 7: psdc12 (2)](https://reader036.vdocuments.pub/reader036/viewer/2022071709/55cf913b550346f57b8bcd8f/html5/thumbnails/7.jpg)
[Lsr
]= [Ldsr L
qsr]
[Lsr]d =
Maf cos θ Mah cos θMaf cos(θ − 2π/3) Mah cos(θ − 2π/3)Maf cos(θ + 2π/3) Mah cos(θ + 2π/3)
[Lsr]q =
Mag sin θ Mak sin θMag sin(θ − 2π/3) Mak sin(θ − 2π/3)Mag sin(θ + 2π/3) Mak sin(θ + 2π/3)
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Voltage Equations
−dψsdt
− [Rs]is = vs
−dψrdt
− [Rr]ir = vr
where
vTs = [va vb vc], vTr = [−vf 0 0 0]
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[Rs
]=
Ra 0 0
0 Ra 0
0 0 Ra
= Ra[I3×3]
[Rr
]=
Rf 0 0 0
0 Rh 0 0
0 0 Rg 0
0 0 0 Rk
![Page 10: psdc12 (2)](https://reader036.vdocuments.pub/reader036/viewer/2022071709/55cf913b550346f57b8bcd8f/html5/thumbnails/10.jpg)
Torque Equation
Jd2θm
dt2= Tm − Te
Te = −∂W′
∂θm= −P
2
∂W ′
∂θ=P
2T ′e
W ′ =1
2
[iTs iTr
] Lss LsrLrs Lrr
isir
T ′e = −1
2
[iTs [
∂Lss∂θ
]is + 2iTs [∂Lsr∂θ
]ir
]