5.6 FIXED EXPORT (BASE LOAD)
NOTE: For further details on the fixed export (base load), refer to DSE Publication: 056-
054 DSExx10 in Fixed Export and see section entitled Single Generator Exporting (Base
Loading) Power elsewhere in this document.
When a generator is running in parallel with the mains isochronously (zero droop), the amount of
power it produces has to be controlled.
It is the job of the DSE8x10 to make precise changes to the amount Active Power (kW) and Reactive
Power (kvar) produced by the generator. The Active Power (kW) regulation is achieved by controlling
the engine’s governing system. This is done to alter the amount of fuel supplied to the engine and
then monitor the amount of Active Power (kW) produced by the generator. The Reactive Power (kvar)
regulation is achieved by controlling the alternator’s AVR. This is done to alter the amount of field
excitation supplied to the alternator and then monitor the amount of Reactive Power (kvar) supplied
by the generator.
The DSE8x10 knows it is going to parallel with a mains supply due to a digital input configured for
Mains Parallel Mode being active. This same input is also used to enable the Mains Decoupling
(ROCOF and Vector Shift) protections once the generator load switch has closed.
When the generator is paralleled to the mains, the DSE8x10 controller instructs the generator to
produce a pre-set percentage of the generators rating. This pre-set percentage is changeable whilst
the generator is running via a multitude of different interfaces. In the example below, the generator is
instructed to produce 80 % of its kW rating and 30 % of its kvar rating. This results in only 30 kW
being exported to the Mains as the local site load consumes the majority of the power produced by
the generator.
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