New features of electricity supplement

transmission and consumption under the new normal circumstance

as well as their effects on frequency modulation(FM) were concluded. The contribution of flexible operation on frequency modulation was analyzed based on the experimental data

including condensed water throttling method

high pressure heater bypass method

additional steam valve method

cooling working medium method and cogeneration steam extraction method. The theory

advantages and disadvantages of the key factors of frequency modulation were discussed

including how to set the primary frequency modulation parameters

how to optimize the valve flow characteristics

how to solve the problems of frequency modulation compensation

frequency modulation antiregulation and estimation of frequency modulation ability. At last

a kind of multilevel frequency modulation strategy for thermal power plants was proposed to satisfy the need of flexible operation.