Method and system for controlling the opening degree of steam turbine valve of thermal power unit

Abstract

The invention relates to a method and system for controlling the opening degree of a steam turbine governing valve of a thermal power generating unit. A steam turbine is controlled according to throttle pressure, a throttle pressure set value, a primary frequency modulation instruction, a thermal power generating unit load value, a thermal power generating unit load set value, the feedforward component of an obtained steam turbine master control adjusting instruction, the integral operation component of the steam turbine master control adjusting instruction, the scaling operation component of the steam turbine master control adjusting instruction and the steam turbine pressure deviation operation component of the steam turbine master control adjusting instruction, the load deviation of the thermal power generating unit can be effectively reduced, and integral regulation is controlled; the stability of a CCS is achieved, proportional regulation can be effectively subjected to amplitude limiting, and system instability caused by too large deviation is avoided; and the load deviation of the thermal power generating unit is reduced, the throttle pressure can be stable, and disturbance of a boiler is reduced.

Description

technical field

[0001] The invention relates to the field of electric power, in particular to a method and system for controlling the opening of a steam turbine valve of a thermal power unit. Background technique

[0002] As the control center of the boiler-turbine system, the unit unit coordinated control system (CCS) has become the most core component unit in the modern power plant automation system. CCS controls the boiler control system and the steam turbine control system of the thermal power unit as a whole and coordinates and cooperates with each other, so that the boiler and steam turbine can adapt to the needs of the frequency change of the power grid as soon as possible, and jointly maintain the control system for the safe and stable operation of the thermal power unit. However, the CCS system is a complex multivariable control system with complex interrelationships inside, and the coupling characteristics between the control loops of the furnace make it difficult ...

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