Study And Realization On Load Control Character For 142MW Thermal Power Unit In Xigu Power Plant Of Gansu

With the enlargement of capacity of electric network and the increase of quality requirement of electric energy, the requirements of Automatic Generate Control (AGC) of electric power system are increasingly urgent. To resolve AGC problem perfectly, the base is unit burthen control. The famous coordination control scheme-direct energy balance (DEB) method-is still the focus of the thermal power plant control domain.With the development of computer technology, the Distributed Control System(DCS) are widely used in the power plant running control.The #9 and #10 142MW heat supply units in GanSu XiGu power plant, the steam extraction main pipe system adopt WESTATION control system of Westing House Company and DEB coordination control policy in design. The coordination control policy successfully expand the whole the running range, from the normal running condition to abnormity running condition and start or stop condition, which simplicity base on burthen and main steam pressure coordination control. And the coordination control policy keeps units health level and safely, economically, optimizing work.Stability of main steam pressure is the foundation of the key parameter Stability (include the main steam temperature, the vapor pack water level, the oxygen content in the smoke etc.) in the units , DEB system increase the dependability and the economy greatly with the settlement of the energy's equilibrium between the boiler and the steamer .With deep analysis to mechanism of power set and on the experience the foundation summary and extensive exploring, the text put forward the policy of controlling optimization to the whole unit, increase the automation levels of No.9 set and No.10 power set in Xigu Power Plant, and keep the best movement work, the marked economy and social performance.