6.4 Operating modes
After completion of the E-82 E4 start-up procedure the wind energy converter switches to automat‐
ic mode (normal operation). While in operation, the WEC constantly monitors wind conditions, opti‐
mises rotor speed, generator excitation and generator power output, aligns the nacelle position
with the wind direction, and captures all sensor statuses.
In order to optimise power generation in highly diverse wind conditions when in automatic mode,
the WEC changes between three operating modes, depending on the wind speed. In certain cir‐
cumstances the WEC stops if provided for by the WEC configuration (e.g. shadow shutdown). In
addition, the utility company into whose grid the generated power is fed can be given the option to
directly intervene in the operation of the wind energy converter by remote control, e.g. in order to
temporarily reduce the power feed.
The E-82 E4 switches between the following operating modes:
■ Full load operation
■ Partial load operation
■ Idle mode
6.4.1
Full load operation
Wind speed
v ≥ 13.9 (2.35 MW) / 16 (3 MW) m/s
With wind speeds at and above the rated wind speed, the wind energy converter uses pitch control
to maintain rotor speed at rated (approx. 17.5 rpm) and thus limits the power to its nominal value of
2350/3000 kW.
Storm Control enabled (normal case)
Storm Control enables WEC operation even at very high wind speeds; however, the rotor speed
and the power output are reduced.
If wind speeds exceed approx. 28 m/s (12-second average) and keep increasing, the rotational
speed will be reduced linearly from 17.5 rpm to idle speed at about 34 m/s by pitching the rotor
blades out of the wind accordingly. The power fed into the grid decreases in accordance with the
speed/power curve in the process.
At wind speeds above 34 m/s (10-minute average) the rotor blades are almost in the feathered po‐
sition. The WEC runs in idle mode and without any power output; it does, however, remain connec‐
ted to the receiving grid. Once the wind speed falls below 34 m/s, the WEC restarts its power feed.
Storm control is activated by default and can only be deactivated by remote control or on site by
ENERCON Service.
Storm control disabled
If, by way of exception, storm control is disabled, the wind energy converter will be stopped for
safety reasons if the wind speed exceeds 25 m/s (3-minute average) or 30 m/s (15-second aver‐
age). If none of the above events occurs within 10 minutes after stopping, the wind energy convert‐
er will be restarted automatically.
Control system
D0376616-2 / DA 15 of 21
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