Unit RB target load self-adaptive generation method based on auxiliary machine state

Abstract

The invention relates to a unit RB target load self-adaptive generation method based on an auxiliary machine state, wherein the method comprises the steps: step 1, a control logic obtains a preset control parameter when an important auxiliary machine of a unit has an air blower tripped and triggers an RB, and the load reduction operation is carried out through employing a preset unit RB target load as an instruction; and step 2, in the load reduction process, the control logic monitors the operation state of the auxiliary machine, and whether the output of the auxiliary machine reaches the upper limit or not is judged in real time. The method has the beneficial effects that on the basis of the original control logic, the running state and output of the auxiliary machine after the unit RB occurs are monitored and judged according to the selected state parameters, and the target load is adjusted in real time on the basis of the running state and output. Through self-adaptive generation and flexible adjustment of the RB target load, the actual loading capacity of the auxiliary machine can be matched, so that over-adjustment or under-adjustment in the RB process is avoided, the accuracy and reliability of overall RB control are improved, and the safety and economy of unit operation after tripping of the auxiliary machine are guaranteed.

Description

technical field [0001] The invention belongs to the technical field of rapid load shedding of a large-scale thermal power unit auxiliary machine failure, and in particular relates to an adaptive generation method of a unit RB target load based on the state of an auxiliary machine. Background technique [0002] Today's large thermal power units are usually designed with a rapid load shedding function (RUNBACK, RB) for auxiliary equipment failure. It can quickly reduce the load of the unit according to the control logic when the important auxiliary machine of the unit fails or trips, so as to match the output demand of the auxiliary machine, ensure the smooth transition of important parameters of the unit, and achieve the purpose of maintaining the safe operation of the unit. [0003] In unit RB control, the target load is a key factor related to the success of RB control. After the RB loop is triggered, the unit load command will change to the RB target load according to the...

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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