To solve the problem between operating economy and frequency modulation performance in depth peak load cycling of thermal power plants

a primary frequency-tuning optimization control strategy was proposed. In this strategy

the heat consumption rate

unit back pressure

current load and throttling state of high pressure regulating valve are comprehensively considered

and the main steam pressure which is optimal for each index in sliding pressure operation zone is determined. Based on the multi-objective intelligent sliding pressure operation mode

the condensing water load change technology is fully utilized to increase the utilization rate of the unit heat storage

so as to achieve the objective of balancing the frequency modulation performance and the operational economy at low load of the unit. Combined with full-condition sliding pressure correction

multi-objective intelligent sliding pressure optimization and condensate variable load technology

the primary frequency modulation optimization test was carried out in a 600 MW unit. The results show that

this primary frequency-tuning optimization control strategy can ensure the unit achieve a higher primary frequency pass rate in the low-to-medium load section

which provides an effective way to participate in depth peak load adjustment of thermal power units in the future.