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21 GE Energy
Gas Turbines
CPC Logic
One of the enhancements recently introduced by GE Energy is the Corrected Parameter Control
logic (CPC). This type of control philosophy applies principally to mechanical drive units, and
consists of an exhaust temperature control curve that self adjusts according to the condition of
the inlet filters and actual power turbine speed. This allows the engine to be operated at
optimum conditions not only at the nominal point, but over the entire operating envelop of inlet
conditions and power turbine speeds. The results of this improvement have already been proven
in the field, as shown in the following figure (relating to the test of a GE10-2 unit at various free
power turbine speeds). Thanks to the application of CPC logic it has been possible to significantly
increase the maximum output without compromising the safe operation of the unit by simply
optimizing its operation in real-time.
The variable free power turbine speed element of the CPC logic is provided as standard on the
GE5-2, MS5002D DLN and MS5002E models, and on all new GE10-2 units. The possibility to
retrofit existing gas turbine models with this solution is also offered.
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Ambient Temperature 22°C
Power Turbine Speed (%)
Shaft Power (%)
CPC Control Logic
Old Control Logic