Coordinated Control Method and System for Units Based on Boiler Dynamic Differential Feedforward Command

Abstract

The invention discloses a unit coordinated control method and a system based on a boiler dynamic differential feedforward instruction. Main parameters for unit operation are adopted as the reference quantity for boiler dynamic differential feedforward instruction calculation, and thus, the load response ability of a thermal power generating unit and the adjustment quality are improved. The method and the system have the beneficial effects that as for boiler dynamic differential feedforward BIR calculation, a deflection quantity between a power grid load set value and a unit load instruction is introduced as a correction quantity for an adjustment amplitude, a boiler combustion rate response speed is improved; and through introducing the operation pressure deflection of the unit and the weather working condition, the BIR quantity needed during a boiler variable load process is corrected, and the adjustment precision during the variable load process is improved.

Description

Technical field: [0001] The invention relates to the technical field of coordinated control of thermal power generation units, in particular to a method and system for unit coordinated control based on boiler dynamic differential feedforward commands. Background technique: [0002] Coordination Control System (CCS: Coordination Control System) is the general name of machine and furnace closed-loop control system. boiler control system Instructions issued by the steam turbine control system are used to stabilize the operating parameters of the unit on the one hand, and on the other hand, to maximize the frequency regulation and peak regulation capabilities of the unit by responding quickly to load changes. [0003] In production practice, there is a big difference in the dynamic characteristics of the boiler and the turbo-generator, that is, the turbo-generator responds quickly to the load request, and the boiler responds slowly to the load request, resulting in the mutual re...

AI Technical Summary

Problems solved by technology

[0007] (1) For the heating unit, only the load command is used as the input to calculate the boiler dynamic differential feed-forward command (BIR), which violates the basic principle of unit energy balance and affects the accuracy of the boiler dynamic differential feed-forward command (BIR) calculation , which weakens its effect;

[0008] (2) According to the actual operating characteristics of the unit, in the process of changing load of the unit, as the load command gradually approaches the load set value, in order to prevent the boiler from overshooting when the combustion rate changes rapidly, the boiler dynamic differential feedforward command (BIR ) should be returned to 0 in time, but the typical boiler dynamic differential feed-forward instruction (BIR) does not have this function, which may easily cause the unit boiler combustion rate to overshoot;

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