Possible ways of CCGT participation in the rated primary frequency regulation are analyzed: using gas turbines when the steam turbine operates at sliding steam parameters and with the maximum involvement of the CCGT steam turbine by using the storage capacity of the waste heat boiler drums. The increase in the prime cost of electricity in the first mode due to the wear of the gas turbine and, accordingly, due to the increase in the cost of maintenance and downtime in repairs was calculated. It is shown that in mode 2 the increase in the cost occurs mainly due to a decrease in efficiency (increase in fuel consumption). Recommendations are given on the choice of effective power control modes for CCGT-450, depending on the number of participations in the rated primary frequency regulation per day.

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