Load shedding control strategy of bypass system of thermal power generating unit in isolated network mode

Abstract

The invention provides a load shedding control strategy of a bypass system of a thermal power generating unit in an isolated network mode. The strategy involves a control mode conversion module, an override feed-forward calculation module and a steam parameter control module, wherein the control mode conversion module is used for monitoring load shedding signals in real time so as to judge the full-load shedding working condition and the part-load shedding working condition and then generating a conversion instruction, wherein the conversion instruction comprises a quick opening instruction, amanual automatic switching instruction and a steam parameter setting instruction; the override feed-forward calculation module is used for calculating the override quick opening amount and the adjusting feed-forward amount of each adjusting loop of a bypass according to the full-load shedding working condition and the part-load shedding working condition; and the steam parameter control module isused for carrying out controlling according to the obtained conversion instruction, the override quick opening amount and the adjusting feed-forward amount. According to the strategy, the problem offast response of load shedding control of the bypass system of the thermal power generating unit in the isolated network mode is solved, and the quality of steam parameter control is improved.

Description

technical field [0001] The invention relates to the technical field of thermal power unit control, in particular to a load shedding control strategy for a thermal power unit bypass system in an isolated grid mode. Background technique [0002] During the grid-connected operation of thermal power units, if a fault occurs on the steam turbine, generator or grid side and causes load shedding, in order to quickly restore power transmission after troubleshooting and avoid economic losses caused by unit shutdown, boilers are used to quickly reduce output and bypass The circuit system can be quickly opened and the steam parameters can be maintained in a stable operation, so that the grid can be connected to the grid quickly after the fault is eliminated. This load shedding control method is the fast cut back (FCB) protection of the unit, which includes three working conditions: tripping of the steam turbine, operation of the steam turbine with utility power and idling of the steam ...

AI Technical Summary

Problems solved by technology

In particular, the unit operating in isolated grid may have frequent frequency modulation and quick load unloading for many times in a row. If the previous quick unloading load has not stabilized, there will be no steady-state parameters for reference in the next quick unloading load, which will affect the reliability and stability of bypass control. adversely affect

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