Supercritical unit boiler master controller control method based on primary frequency modulation action amplitude

Abstract

The invention discloses a supercritical unit boiler master controller control method based on primary frequency modulation action amplitude. When the primary frequency modulation compensation amount Delta P is within the set amplitude range, the change requirements of loads can be met through boiler heat accumulation, and a boiler master controller will not be regulated; the unit load regulation speed is also considered, if the change rate of the set value of primary frequency modulation preload commands exceeds the set rate range, the boiler master controller will be regulated, air, coal and water action will be achieved, and therefore the operation parameters can be stable, and the load control requirement can be met. The method effectively improves the unit stability when primary frequency modulation fluctuates within a narrow range. By judging the primary frequency modulation action amplitude and the unit load change rate, different reactions to unit load changes can be achieved, the boiler side will not refuse to move or move fast and frequently, air, coal and water regulation can meet the requirements when action is needed, the unit AGC and primary frequency modulation performance can meet the testing requirement of the power grid, and unit safety operation can be guaranteed.

Description

technical field [0001] The invention relates to the fields of thermal power unit frequency modulation and boiler automatic control, in particular to an optimized control method, specifically a supercritical unit boiler master control method based on the primary frequency modulation action amplitude. Background technique [0002] Grid frequency, as one of the most important power quality indicators, is the basis for grid stability. With new energy connected to the grid, load growth and the scale of the grid continue to increase, under the new situation of the interconnection of the UHV grid and the regional grid, the connection between the grids at all levels is becoming increasingly close, and the requirements for coordination and cooperation between the grid and the unit are also increasing. The higher the value, the primary frequency modulation in the network source coordination function becomes one of the effective means to stabilize the power grid. The primary frequency...

AI Technical Summary

Problems solved by technology

However, due to the rapidity and transient nature of primary frequency regulation, its adjustment curve is mainly reflected in the form of sharp pulses on the side of the power plant unit, resulting in a large fluctuation rate of the load command, resulting in a relatively large change rate of wind, coal and water

Coupled with the hysteresis of boiler combustion, it will eventually lead to changes and oscillations in the coordinated control system, making the main steam pressure and main steam temperature of the unit in an unstable state for a long time, which not only reduces the efficiency of the unit, but also affects the safety and stability of the unit run

At present, the power grid has increasingly strict assessment standards for primary frequency regulation, and the maximum deviation frequency of effective disturbances has gradually decreased, which has significantly increased the number of small disturbances of the unit, seriously affecting the safe and stable operation of thermal power units, especially supercritical thermal power units.

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