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

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...

AI Technical Summary

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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