In order to make full use
of the different
power inverter
speed of wind, should to do in-depth research of variable
speed constant frequency technology, to develop practical, is suitable for
variable speed constant frequency of wind power inverter technology.
3 constant speed constant
frequency power inverter control
3.1 soft start
grid-connection of power inverter
In
wind turbine inverter
unit, the
control system in the change of wind speed for continuous detection, when 10
minute mean wind turbine inverter speed is greater than the starting wind turbine inverter speed, the control of
wind turbines to cut into the power grid all the preparation work: loosen the
mechanical brakes, recover the tip damping plate, the direction of wind turbine inverter
turbines in the wind.
Control system
continuously detect the sensor signal is normal, such as hydraulic system
pressure is normal, whether the wind deviation, wind turbine inverter parameter is normal,
etc.
Such as 10 minutes on
average
grid tie inverter
is greater than the starting wind speed, whether the
detection of grid tie inverter has begun turning, and open the thyristor current
limit rapid start soft starting device of wind turbine, and the starting
current control, which does not exceed the maximum limit.
Asynchronous wind turbine
when starting, because its speed is very small, cut into the grid when the slip
is very big, so will produce equivalent generator rated current of the 5 ~ 7
times the impact of the current, not only caused great impact to power network,
the current may also affect the life of the wind turbines.
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