The regulation deviation from the power regulator can therefore have great or less influence on the PID controller. An adjustment of
0% means that the power control is switched off. An adjustment of 100% means that the power regulation is not limited by the
weight factor. Any adjustment in between is possible.
The difference between adjusting the weight value to a high or low value is the speed at which the power regulation deviation is
eliminated. So if a firm load sharing is needed, the weight factor must be adjusted to a higher value than if an easy load sharing is
required.
An expected disadvantage of a high weight factor is that when a frequency deviation and a power deviation exist, then hunting could
be experienced. The solution to this is to decrease either the weight factor or the parameters of the frequency regulator.
4.6 Synchronising controller
The synchronising controller is used in the AGC whenever synchronising is activated. After a successful synchronisation the
frequency controller is deactivated and the relevant controller is activated. This could e.g. be the load sharing controller. The
adjustments are made in the menu 2050.
Dynamic synchronising
When dynamic synchronising is used, the controller "2050 f
SYNC
controller" is used during the entire synchronising sequence. One of
the advantages of dynamic synchronising is that it is relatively fast. In order to improve the speed of the synchronising further, the
generator will be sped up between the points of synchronisation (12 o’clock to 12 o’clock) of the two systems. Normally a slip
frequency of 0.1 Hz gives synchronism each 10 seconds, but with this system on a steady engine the time between synchronism is
reduced.
Static synchronising
When synchronising is started, the synchronising controller "2050 f
SYNC
controller" is activated and the generator frequency is
controlled towards the busbar/mains frequency. The phase controller takes over when the frequency deviation is so small that the
phase angle can be controlled. The phase controller is adjusted in the menu 2070 ("2070 phase controller").
4.7 Relay control
When the relay outputs are used for control purposes, the regulation works like this:
Regulator output
Fix up signal Up pulse No reg. Down pulse Fix down signal
45 Hz 50 Hz 55 Hz
Hz
DESIGNER'S HANDBOOK 4189341275A EN Page 80 of 196
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