Equipment output mutation balance control method and system

Abstract

A balance control method and system for abrupt change in device output. The method comprises: acquiring device output information containing a rated device output, a current device output, a set adjusted amount and a measured adjusted amount, and obtaining a device output override control condition (S101); detecting a device output override decrease condition and override increase condition (S102); and if the override increase condition is detected, increasing a device control instruction according to a predetermined rate, and if the override decrease condition is detected, decreasing a device control instruction according to a predetermined rate (S103). By means of the method, non-linear characteristics of a device control instruction and a device output are overcome, and a machine set can rapidly reach a safe and stable new operating condition.

Description

technical field [0001] The invention relates to the technical field of automatic control of thermal power units, in particular to a method and system for controlling sudden change in equipment output balance during the RUNBACK process of thermal power units. Background technique [0002] In the technical field of thermal power unit automatic control, the RUNBACK (RB for short) process refers to: when the main auxiliary equipment of the unit fails to trip and the actual power of the unit is limited (the coordination control system is in the automatic state), in order to adapt to the output of the equipment, the control system is forced to The load of the unit is reduced to the load target value that the auxiliary machine that is still in operation can bear; it is also called the load reduction process of the auxiliary machine failure. The RUNBACK process includes equipment output overriding control. When the system receives abnormal signals such as accident alarms, deviations...

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Problems solved by technology

[0004] The existing method of increasing the output of the auxiliary equipment in operation after the auxiliary equipment of the unit trips basically adopts the linear superposition method of adding the output of the equipment that has tripped to the equipment in operation in proportion. This method does not take into account the control commands of auxiliary equipment The non-linear relationship with the actual output of the auxiliary machine, the output limit of the auxiliary machine itself in operation, the adjusted amount of the corresponding system, and the change relationship of some other limited quantities can easily cause the equipment in operation to exceed the allowable maximum output and other parameters of the unit to exceed the limit. limited risk

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