A self-adaptive generation method of unit rb target load based on auxiliary machine state

Abstract

The present invention relates to a method for adaptively generating the RB target load of a unit based on the state of an auxiliary machine, comprising: Step 1. When an important auxiliary machine of the unit has a fan trip and triggers the RB, the control logic obtains preset control parameters, and uses the preset unit RB target load is an instruction to carry out a load reduction action; step 2. During the load reduction process, the control logic monitors the operation status of the auxiliary machine and judges in real time whether the output of the auxiliary machine reaches the upper limit. The beneficial effects of the present invention are: on the basis of the original control logic, the present invention monitors and judges the operating state and output of the auxiliary machine after RB occurs according to the selected state parameters, and adjusts the target load in real time based on this. Through self-adaptive generation and flexible adjustment of RB target load, it can match the actual load capacity of the auxiliary machine, thereby avoiding overshoot or undershoot during the RB process, improving the accuracy and reliability of the overall RB control, and ensuring the tripping of the auxiliary machine The safety and economy of the unit operation.

Description

An adaptive generation method of RB target load based on auxiliary machine state technical field The invention belongs to the technical field of fast load shedding of large-scale thermal power unit auxiliary machine failure, in particular to a kind of auxiliary machine based on The state-of-the-art unit RB target load adaptive generation method. Background technique [0002] Today's large thermal power units are usually designed with auxiliary failure rapid load shedding function (RUNBACK, RB). it can be in When the important auxiliary machine of the unit fails or trips, the load of the unit is quickly reduced according to the control logic, so as to match the output of the auxiliary machine. It can ensure the smooth transition of the important parameters of the unit and achieve the purpose of maintaining the safe operation of the unit. [0003] In the unit RB control, the target load is a key factor related to the success of the RB control. due to triggering After t...

AI Technical Summary

Problems solved by technology

[0006] In actual operation, the operating status and load capacity of the major auxiliary machines of the unit often change with the working conditions and equipment conditions of the unit, so the method of using a fixed value as the RB target load of the unit cannot fully meet the operating needs

Once the RB target load setting is inappropriate, it will affect the recovery of the unit RB process and the unit status in the slightest, and may even lead to the expansion of the accident and the non-stop of the unit in severe cases.

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