Coal-fired unit coordination control method and system

Abstract

The invention discloses a coal-fired unit coordination control method and system. The method comprises the steps that proportional adjustment is conducted according to a boiler heat signal and the current fuel quantity, and a proportional adjustment result is obtained; integral adjustment is conducted according to a coal-fired unit load instruction and a pressure deviation signal, and an integraladjustment result is obtained; boiler coordination control is carried out according to a boiler heat signal, a turbine energy demand signal, the proportional adjustment result and the integral adjustment result; a variable load rate correction coefficient is determined according to the actual value of the main steam pressure of a coal-fired unit and the sliding pressure instruction of the coal-fired unit; the variable load rate set value is corrected according to the variable load rate correction coefficient to obtain a corrected variable load rate; a coal-fired unit load regulator set value is determined according to the corrected variable load rate and the coal-fired unit load instruction; machine coordination control is carried out according to the set value of the load regulator of thecoal-fired unit and the actual load. The method has the advantages of being capable of guaranteeing deep regulation of the load in the load changing process of the coal-fired unit and improving regulation quality.

Description

technical field [0001] The invention relates to the technical field of coordinated control of power plants, in particular to a method and system for coordinated control of coal-fired units. Background technique [0002] Compared with the conventional peak shaving mode, when the peak shaving depth of the coal-fired unit is continuously decreasing, each system gradually approaches the lower limit of safety adjustment, and problems such as reduced adjustment margin and poor linearity are prominent. At the same time, the wind, coal, The dynamic response characteristics of water change, the nonlinear characteristics are obviously strengthened, and the coupling effects between systems are obvious, resulting in poor adjustment quality and adaptability of coordinated control, weakened anti-interference ability, and high operational risk. [0003] In the case of normal peak shaving of the power grid, the Automatic Generation Control (AGC) command is adjusted with continuous or repeat...

AI Technical Summary

Problems solved by technology

[0005] At present, there are disadvantages such as poor coordination control and adjustment quality and weak anti-interference ability in the process of deep load change, and it is impossible to guarantee the deep, fast and accurate quality requirements of load regulation in the process of deep load change of coal-fired units

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