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Control method and system thereof for biaxial gas-steam combined cycle unit

A combined cycle unit and control method technology, which is applied to steam engine installations, combined combustion mitigation, mechanical equipment, etc., can solve the problems of the automatic power generation AGC control module not being designed, not considering the primary frequency regulation capability of the steam turbine, and not considering the technical management regulations, etc. To achieve the effect of improving control quality, strong versatility and practicability, and improving the ability of load response

Active Publication Date: 2010-07-07
NORTH CHINA ELECTRICAL POWER RES INST +1
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  • Application Information

AI Technical Summary

Problems solved by technology

[0006] However, for the design of a single-shaft gas-steam combined cycle unit, its technology cannot be copied to the coordinated control system design of a double-shaft or multi-shaft gas-steam combined cycle unit, and it does not consider the relevant technical management regulations of my country's power grid. The power generation AGC control module is not designed, and the primary frequency regulation only considers the primary frequency regulation capability of the gas turbine, and does not consider the primary frequency regulation capability of the steam turbine

Method used

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  • Control method and system thereof for biaxial gas-steam combined cycle unit

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Embodiment 1

[0024] figure 1 Shown is the structural block diagram of the twin-shaft gas-steam combined cycle unit control system of Embodiment 1 of the present invention, as figure 1 As shown, the control system of the twin-shaft gas-steam combined cycle unit in Embodiment 1 of the present invention includes: a load value acquisition unit 101, which is used to acquire the actual power value and target power value of the twin-shaft gas-steam combined cycle unit The load control unit 102 is used to control the load of the gas turbine according to the deviation between the actual power value and the target load value, so that the actual power value is consistent with the target load value; the load distribution unit 103 is used to According to the actual operation of the twin-shaft gas-steam combined cycle unit, the load ratio of the gas turbine and the waste heat boiler-steam turbine is corrected; the load change rate calculation unit 104 is used to calculate the upper limit, lower limit, a...

Embodiment 2

[0037] image 3Shown is a structural block diagram of the control system of the twin-shaft gas-steam combined cycle unit according to Embodiment 2 of the present invention. Such as image 3 As shown, the coordinated control technical solution of the twin-shaft gas-steam combined cycle unit control system in Embodiment 2 of the present invention mainly includes: the coordinated control function of the gas turbine generator set and the steam turbine generator set, automatic power generation (AGC) control loop, primary frequency modulation Control loop, sequential control start-stop function with breakpoint of combined cycle unit, etc.

[0038] Coordinated control function of gas turbine generator set and steam turbine generator set

[0039] The coordinated control module of the combined cycle unit is implemented on the side of the distributed control system (DCS), supplemented by the gas turbine control system (TCS), the steam turbine control system (DEH) and the necessary ind...

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Abstract

The invention provides a control method and a system thereof for a biaxial gas-steam combined cycle unit; the method includes that: the actual power value and the target power value of a biaxial gas-steam combined cycle unit are acquired; the load of a gas turbine is controlled according to the deviation of the actual power and the target load value to enable the actual power value to accord with the target load value. The invention fulfills the domestic control technique gap of the biaxial gas-steam combined cycle unit and has great reference value on the coordinated control system design of the multi-axial gas-steam combined cycle unit. Besides, the invention also proposes a control strategy of the gas-steam combined cycle unit according to the control characteristics of a gas turbine, an exhaust-heat boiler and a steam turbine, realizes the integral control function requirements of the combined cycle unit, guarantees the quick load increasing and decreasing demands of the whole combined cycle unit, and also meets the requirements of the power grid dispatching department. The control method and the system have clear control strategy and logistics, strong controllability, higher generality and practicality.

Description

technical field [0001] The invention relates to the technical field of industrial control, in particular to the control technology of a gas-steam combined cycle unit, specifically a control method and system for a biaxial gas-steam combined cycle unit. Background technique [0002] The control system of a gas-steam combined cycle unit (especially a twin-shaft or multi-shaft combined cycle unit) is different from the coordinated control system of a conventional thermal power plant. The system is more complicated. It not only automatically changes the gas turbine load according to the unit load requirements, but also considers the turbine generator load and coordinates to meet the changes in external load instructions. [0003] At present, the domestic power industry has basically mastered the coordinated control technology of conventional coal-fired units, but has relatively little understanding of the coordinated control technology of gas-steam combined cycle units, especia...

Claims

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Application Information

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IPC IPC(8): F01K23/06
CPCY02E20/16
Inventor 李卫华宋兆星鲁学农
Owner NORTH CHINA ELECTRICAL POWER RES INST
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