... optimization of the variable- speed wind turbine by tracking the
optimal turbine speed at a given wind speed. The result of the optimization is the optimal power efficiency
C
p
at the given speed. In the ... LLC
2-22 Variable Speed Generators
and
θ
s
have to be
estimated. The rotor position is needed. Rotor speed
ω
r
is also needed, both in the voltage decoupler
and for prime...
... and, for given speed U (P.U.),
the initial value of f may be taken as f(1) = U. After one computation cycle, the slip S(1) is calculated,
and the new value f(2) is f(2) = v + S(1). The whole ... 4.13 [16]. A rather wide speed range
4-16 Variable Speed Generators
FIGURE 4.12 Torque speed curves for the 4/6 pole combination.
FIGURE 4.13 Line voltage /speed with C
= 100 µF for a 4/6 p...
... off-the-shelf device intended for variable speed drives with fast
regenerative braking of large inertia loads.
The turbine was emulated by a variable speed drive in speed control mode. Starting can ... of pumping operation, that needs variable speed
during generating periods to eliminate the speed governor and provide for good overall turbine efficiency
for variable water hea...
... by Taylor & Francis Group, LLC
7-24 Variable Speed Generators
The rotor speed comes as the difference between the rotor flux vector speed and the slip speed. An exact
value of rotor resistance ... a speed observer
is also needed.
As speed control is not imperative at very low speed, sensorless DTFC without signal injection was
proven to produce fast and safe torque response a...