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

A combined cycle unit and control method technology, which is applied to steam engine installations, mechanical equipment, machines/engines, etc., can solve the problems of complex thermal system structure and achieve the effect of stable control

Active Publication Date: 2015-08-19
STATE GRID CORP OF CHINA +1
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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 exte

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

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Embodiment Construction

[0018] The implementation of the present invention will be described in further detail below with reference to the accompanying drawings. The following embodiments are only descriptive and not restrictive, and the protection scope of the present invention cannot be limited by this.

[0019] A two-to-one heavy-duty gas-steam combined cycle unit AGC control method, such as figure 1 As shown, including the method steps are as follows:

[0020] (1) The intermediate AGC load command accepted by the generator set load management center is processed by the rate limiting module to limit the speed and the power limiting module to limit the actual load command. The rate limiting module changes the input unit load command signal rate It is limited to the range of 0-4% of the rated load of the unit. The power limiting module limits the power of the input signal to the range of 40%-100% of the rated load of the complete unit to ensure that the load change rate and amplitude of the unit are with...

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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...

Claims

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Application Information

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IPC IPC(8): F01K23/10F01K13/02
Inventor 王建军张应田周连升李浩然倪玮晨
Owner STATE GRID CORP OF CHINA
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