Steam turbine sliding pressure optimization control method based on multi-dimension curved surface

Abstract

The invention discloses a steam turbine sliding pressure optimization control method based on a multi-dimension curved surface. In order to solve the problems that a sliding pressure model of a steam turbine is single-variable (generator power) function usually based on unit designed backpressure in the load-variable sliding-pressure operation process of a power plant steam turbine, the unit operates under the condition with deviation from the unit designed backpressure at most time, the previous control model is free of consideration of influence of the unit backpressure factor and certain influence is generated on the sliding-pressure operation economy of the unit, the invention discloses a novel sliding pressure control method based on a multi-dimension curved surface. The sliding pressure control model obtained by the method has consideration on the influence on main steam pressure when the unit backpressure deviates from the designed value so as to ensure that the steam turbine can operate in an optimal sliding-pressure manner; the operation economy of the unit is effectively improved.

Description

technical field [0001] The invention relates to the field of steam turbine control in thermal power plants, in particular to a steam turbine sliding pressure optimization control method based on multi-dimensional curved surfaces. Background technique [0002] With the continuous expansion of power grid capacity, the peak-to-valley difference of power load is also increasing, resulting in more and more peak-shaving time for units. In order to improve the operating economy, sliding pressure operation is the mode often used during the low-load operation of the unit during peak regulation. [0003] At present, during the variable load sliding pressure operation of the steam turbine, the sliding pressure control model adopted is mostly a curve function, that is, a single variable (generator power) function, which takes the unit load as a variable and is aimed at rated parameters (back pressure, air temperature) derived from the following. However, due to the influence of temper...

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Problems solved by technology

[0008] The purpose of the present invention is to solve the problem of affecting the economy of the unit when the back pressure changes during the sliding pressure operation of the steam turbine, and propose a steam turbine sliding pressure optimization control method based on a multi-dimensional curved surface, so that the steam turbine can still maintain the optimal pressure when the back pressure changes operation mode, further improving the economy of the unit during sliding pressure operation

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