Against the original primary frequency regulation control logic

a digital electro-hydraulic(DEH) control system based new strategy was designed.In this control strategy

the power system frequency replaced the turbine speed and participated in the primary frequency control.The fast DEH scan cycle characteristics was employed to configure control logic of the primary frequency regulation power

primary frequency regulation valve and primary frequency regulation power control logic of the unit coordinated control(UCC).Moreover

the primary frequency power control logic of the UCC side was configured.The frequency regulation power was directly transferred from DEH to UCC to obtain the power system frequency deviation rapidly

thus to adjusting the frequency quickly.Besides

according to the low heat storage characteristic of once through boiler in supercritical unit

to ensure the speedability

effectiveness

safety and long-term stability of the primary frequency regulation

the frequency regulation power was added into the static and dynamic feedforward control of boiler load.