GE DS200RTBAG2AFB Gas turbine card

In droop operation, a portion of the load signal voltage is fed to the controller circuit. This voltage is used by the comparator circuit to reduce the control output by a percentage determined by the DROOP potentiometer. The output is reduced, and the Caterpillar digital speed control reduces engine power according to the desired droop percentage. When a generator set using the Load Sharing Module is paralleled in droop with other generator sets, the common load signal on the paralleling lines is not used. The frequency of the generator set will therefore vary with load, so it must be determined by a different means. In an isolated system with two or more generator sets paralleled, if isochronous speed control is required, one of the generator sets must be running in the isochronous (constant speed) mode. This generator set maintains the frequency of the system. If a generator set is in droop and is paralleled with an infinite bus, the bus determines and maintains the frequency. The DROOP percentage and the speed setting on the Caterpillar digital speed control determine the amount of the load that is carried by the generator, when running in droop.

Speed Trim Circuit 

A 10 k, 10-turn speed-trim potentiometer can be added to the Load Sharing Module to permit remote adjustment of the load or frequency of the generator. The speed trim is normally used for manual synchronization of a generator set with an existing bus or to change the load demand when in droop mode. If no speed trim is needed, add a 10 k resistor between terminals 26 and 28.

Isochronous Load Sharing 

Each comparator circuit compares the load signal voltage for its generator set to two times the voltage on the load sharing lines and produces an error voltage proportional to the difference. This error voltage is used to generate a pulse width modulated signal which is output to the Caterpillar speed control. This output biases the speed loop of the Caterpillar control until the load signal voltage is equal to that of other generators on the load sharing lines.

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