IS220PDIOH1B Gas turbine card

VAR Control The VAR control adjusts generator voltage to maintain a constant reactive power (kVAR) load on the generator throughout the kW operating range while the generator is in parallel with the mains. This assures sufficient excitation of the generator field under all load conditions. A set point is provided to set the desired VARs. The VAR control function may be enabled with VAR/PF Control mode selection set point. The kVAR reference may be changed once the generator is in parallel with the mains by issuing a raise/lower voltage contact input to the EGCP-2. Raising the kVAR reference will raise the voltage bias output to the voltage regulator, which will cause VARs to be exported to the Mains. Lowering the VAR reference will decrease the voltage bias output to the regulator that will cause VARs to be absorbed from the utility.

Power Factor Control

 The power factor control adjusts generator voltage to maintain a constant power angle throughout the kW operating range while the generator is in parallel with the mains. A set point is provided for the desired power factor reference. The power factor control function may be enabled with the VAR/PF Control mode selection set point. The PF reference may be changed once the generator is in parallel with the mains by issuing a raise/lower voltage contact input to the EGCP-2. Raising the PF reference will raise the voltage bias output to the voltage regulator, which will cause the PF to move in an increasing lagging PF angle. Lowering the PF reference will decrease the voltage bias output to the regulator that will cause PF to move in an increasing Leading PF angle.

Power Factor Sharing

 When either VAR or Power Factor Control is selected, and the EGCP-2 control is operating in isochronous load sharing mode, power factor sharing is automatically selected. Power factor sharing adjusts the voltage regulators so that all generators carry the same proportion of reactive load by balancing the power factor on all units. A voltage reference set point is provided to define the system operating voltage. Multiple EGCP-2 controls operating in Power Factor Sharing mode will trim their respective voltages to share the reactive load on the isolated bus, and operate around the voltage reference setting.