Two-on-one heavy type gas-steam combined cycle unit AGC control method

Abstract

The invention relates to a two-on-one heavy type gas-steam combined cycle unit AGC control method. The two-on-one heavy type gas-steam combined cycle unit AGC control method comprises the steps that 1, an actual AGC load instruction is produced; 2, deviation between a produced total power signal and the actual AGC load instruction is calculated and then is transmitted to an integral operation module to perform integral operation; 3, subtraction operation is conducted on the actual AGC load instruction and actual load of a steam turbine generator unit, then the difference is divided by two, and a result is superposed in a unit total load control loop; 4, deviation between a unit front pressure control given value obtained after a steam turbine load signal is subjected to conversion of a function f (x) and a unit front pressure measurement value is calculated, then proportional-integral operation is performed, and a result serves as a steam turbine control instruction; 5, a watch keeper manually sets load offsets of two gas turbines to achieve load optimization configuration of the two gas turbines and keep total power constant. The two-on-one heavy type gas-steam combined cycle unit AGC control method enables the capacity of responding to the outside AGC load instruction of a whole unit to be effectively improved and enables the unit to flexibly adapt to various operating modes.

Description

Technical field [0001] The invention belongs to the technical field of automatic power generation control, in particular to an AGC control method for a two-to-one heavy-duty gas-steam combined cycle unit. Background technique [0002] At present, the control of air pollution in my country is extremely heavy, and coal-fired power generating units in central cities are gradually shutting down. For this reason, the country has introduced a large number of two-to-one heavy-duty gas-steam combined cycle power generation units to reduce air pollutant emissions from the power generation units. . The two-to-one heavy-duty gas-steam combined cycle unit is more complex than the unit unit's thermal system structure. Two heavy-duty gas turbine generator sets operate in parallel, and the high-temperature flue gas discharged from them enters two waste heat boilers respectively, using the high temperature and high pressure generated by the waste heat boiler Steam drives the steam turbine unit t...

AI Technical Summary

Problems solved by technology

The thermal system structure of the two-to-one heavy-duty gas-steam combined cycle unit is more complicated than that of the unit unit. Since the load distribution of the gas turbine-steam combined cycle generator set uses the gas turbine to actively respond to external load commands, the steam turbine generator set adopts sliding pressure operation, pressure Control the way of load following, so the actual load of the steam turbine generator set changes with the load of the gas turbine, and there is a large inertia and delay

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