| 摘要: |
The paper describes the engineering and
design of a doubly fed induction generator
(DFIG), using back-to-back PWM voltage-source
converters in the rotor circuit. A vector-control
scheme for the supply-side PWM converter
results in independent control of active and
reactive power drawn from the supply, while
ensuring sinusoidal supply currents. Vector
control of the rotor-connected converter provides
for wide speed-range operation; the vector scheme
is embedded in control loops which enable
optimal speed tracking for maximum energy
capture from the wind. An experimental rig,
which represents a 1 . 5kW variable speed windenergy generation system is described, and
experimental results are given that illustrate the
excellent performance characteristics of the
system. The paper considers a grid-connected
system; a further paper will describe a stand-alone
system.
List of symbols
V, = RMS stator voltage
V, = RMS rotor voltage
ml, m2= stator and rotor converter modulation depths
E = DC link voltage
s = slip
n = stator ~ rotor turns ratio
L, R = inductance and resistance of supply side inductors
v,, vb, v, = 3-phase supply voltages
vd, vq, v,, vp= 2-axis supply voltages
val, v b l , vbl = 3-phase stator converter terminal voltages
vdl,vql = 2-axis stator converter terminal voltages
i,, ib, i,= 3-phase stator converter input currents
id, i, = 2-axis stator converter input currents
0IEE, 1996
ZEE Proceedings online no. 19960288
Paper received 27th July 1995
The authors are with the DeDartment of Electrical & Electronic Enpineering, The University of NotGnghm, University Park, Nottinghm- NG7
2RD, UK
a,, a,,aAl,= supply, rotor, slip angular frequency
P, Q = active and reactive power
e,, 8, = supply voltage, stator flux vector position
io,, io, = stator and rotor converter DC-link currents
C = DC-lirtk capacitance
F(s),F(z)= plant-transfer functions
G(z)= controller-transfer function
5 = damping factor
h = flux linkage
L,, L,, L,, Lo = machine inductances per phase
R,, R, = machine resistances per phase
0 = leakage factor
i,, = stator magnetising current
P = pole pairs
K,, K,, K,, K, = controller gains
a,, a,, a,, a,, = controller parameters
P,, P,,, P,,, = mechanical, optimum, maximum power
Cp,h, p, r = turbine power coefficient, tip speed ratio |
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