Control method for coordination and automatic power generation of coal quality self-adaptive thermal power generating unit

Abstract

The invention provides a control method for coordination and automatic power generation of a coal quality self-adaptive thermal power generating unit. The method comprises the following steps of: 1, compressively determining the coal quality according to parameters including first-level pressure of a steam engine, drum pressure, coal feed, unit load and the like; 2, by the determined coal quality, performing the coal quality self-adaptive control over main control systems of fuel, coordination, air delivery and the like; 3, by core control strategies of boiler load commands, main steam pressure settings, a coal quality self-checking positive load upper limit and the like, realizing the control over the coal quality self-adaptive coordination and automatic power generation of the thermal power generating unit; and 4, realizing the automatic safe operation of the thermal power generating unit by improving safety locking conditions of the thermal power generating unit. The method has the following obviously advantages that: under a fluctuating condition of the coal quality of the thermal power generating unit, the automatic power generation and the coordination control of the thermal power generating unit are unnecessarily intervened by people, and the scheduling requirements are still met; and compared with the conventional control method, the control method of the invention has the advantages that: the accuracies of the main controlled parameters of the thermal power generating unit are further improved; and simultaneously, the automatic power generation control indexes and the safety and the economy of the thermal power generating unit are enhanced.

Description

technical field [0001] The invention belongs to the thermal automatic control field of a thermal power plant, and relates to a unit automatic power generation (hereinafter referred to as AGC) and coordinated control and a sub-system control method capable of adapting to changes in coal quality. Background technique [0002] At present, my country's electric power is still dominated by thermal power generation, and this status quo will continue for decades. With the development of the electricity market, the coal combustion of many domestic thermal power units often deviates from the design value. Coal quality deteriorates and changes greatly, so that the coordinated control and AGC function of the unit cannot be put into use, which seriously affects the dispatching of the unit by the power grid. When the coordinated control and AGC functions are poor in coal quality or coal quality changes greatly, there are safety and economic disadvantages such as large fluctuations in un...

AI Technical Summary

Problems solved by technology

If the fuel quantity is corrected by the steam flow rate, when the turbine valve is disturbed (such as a frequency adjustment), the steam flow rate will change, which will inevitably lead to a change in the fuel, making the fuel control system unable to operate stably

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