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Control system and method for ultra-supercritical secondary reheating unit to participate in power grid primary frequency modulation

A secondary reheating, ultra-supercritical technology, applied in control systems, mechanical equipment, steam engine installations, etc., can solve the problem of no design of supplementary steam frequency regulation, few ultra-high pressure, high pressure and medium pressure regulating valve power grid primary frequency regulation and other problems , to achieve the effect of eliminating axial force

Pending Publication Date: 2020-02-14
XI AN JIAOTONG UNIV
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Problems solved by technology

At present, none of the double-reheat ultra-supercritical throttling steam distribution units put into production in China is designed for frequency regulation of supplementary steam, and there are few studies on controlling ultra-high pressure, high-pressure and medium-pressure regulating valves to participate in primary frequency regulation of the power grid at the same time.

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  • Control system and method for ultra-supercritical secondary reheating unit to participate in power grid primary frequency modulation
  • Control system and method for ultra-supercritical secondary reheating unit to participate in power grid primary frequency modulation
  • Control system and method for ultra-supercritical secondary reheating unit to participate in power grid primary frequency modulation

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Embodiment Construction

[0060] In order to make the purpose, technical effects and technical solutions of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention are clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention; obviously, the described embodiments It is a part of the embodiment of the present invention. Based on the disclosed embodiments of the present invention, other embodiments obtained by persons of ordinary skill in the art without making creative efforts shall all fall within the protection scope of the present invention.

[0061] see figure 1 and figure 2 , a control system for an ultra-supercritical double-reheating unit participating in the primary frequency regulation of the power grid in an embodiment of the present invention, including: a once-through boiler, an ultra-high pressure cylinder, a high-pressure cylinder, a medium-pressure cyli...

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Abstract

The invention discloses a control system and method for an ultra-supercritical secondary reheating unit to participate in power grid primary frequency modulation. The system comprises an ultrahigh-pressure cylinder regulation valve, a high-pressure cylinder regulation valve, a medium-pressure cylinder regulation valve, a first steam supplementing valve and a second steam supplementing valve; ultrahigh-pressure cylinder regulation valve, the high-pressure cylinder regulation valve and the medium-pressure cylinder regulation valve of a secondary reheating unit can be controlled to simultaneouslyparticipate in power grid primary frequency modulation in a steam supplementing regulation mode. When the practical load of a power grid is higher or lower than a rated load, the frequency of the power grid deflects for 50 HZ; the deflection change of the frequency of the power grid is received by the control system; the opening amplitudes of the ultrahigh-pressure cylinder regulation valve, thehigh-pressure cylinder regulation valve and the medium-pressure cylinder regulation valve are controlled, and the steam inlet flow of each cylinder is changed, so that the mechanical power output of asecondary reheating turbine is changed; and practical power output is matched with the load of the power grid, so that primary frequency modulation of the power grid is realized.

Description

technical field [0001] The invention belongs to the technical field of power grid frequency regulation, and in particular relates to a control system and method for an ultra-supercritical secondary reheating unit participating in primary frequency regulation of a power grid. Background technique [0002] The steam turbine of the double reheat unit is divided into ultra-high pressure cylinder, high pressure cylinder, medium pressure cylinder, low pressure cylinder module, boiler, condenser, regenerator, deaerator and other modules, and the unit above 300MW is equipped with 9~10 stages Due to the characteristics of high operating parameters and complex structure, the extraction and reheating technology puts forward higher design requirements for the secondary reheating technology. [0003] In practical engineering applications, both supercritical and ultra-supercritical units adopt sliding pressure operation, which effectively reduces the throttling loss caused by the throttle...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F01K13/02F01K7/32F01D17/10F22B35/12
CPCF01D17/10F01K7/32F01K13/02F22B35/12
Inventor 戴义平郑少雄范刚陈康曹越许文盼
Owner XI AN JIAOTONG UNIV
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