Dynamic modeling and variable load control optimization for 600 MW class ultra-supercritical coal-fired power generation units
To improve the control effect of key parameters and energy conversion efficiency of ultra-supercritical coal-fired power generation units during load cycling process,600 MW class ultra-supercritical coal-fired power generation units are taken as the research objects to carry out modeling and verification.The deviation of key thermal parameters meets the specified range of thermal power simulation standard.The spatiotemporal distribution model of internal heat storage in thermal system of coal-fired power generation units is established,and the water-fuel ratio and flue gas damper opening control logic of the feedforward internal heat storage state of the unit are proposed.The real-time heat storage state of the unit during the load cycling process is fed forward to the flow rate of feed water,coal,and flue gas damper control.The simulation results show that,when the unit load cycling rate varies from 1.0%Pe/min to 3.0%Pe/min within 40%～70%THA load range,the absolute value of the cumulative main steam temperature deviation rate decreases by 27%～31%.The average power generation standard coal consumption rate of the unit decreases by 0.37～0.65 g/(kW·h)during the transient process.The proposed control strategies improve the control accuracy of key thermal parameters and the energy conversion efficiencies of the ultra-supercritical coal-fired power generation units during load cycling transient processes.
coal-fired power generationvariable loadsteam temperature controltransient energy saving
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