Condensed water auxiliary frequency modulation control method and system with one-way precision control

Abstract

The invention discloses a condensed water auxiliary frequency modulation control method with one-way precision control. The method includes the following processes of: obtaining operating parameters of a unit; calculating the power capability limit of the current unit in the throttling frequency modulation increase direction and the condensed water flow that needs to be changed according to the operating parameters of the unit; determining whether to trigger the frequency modulation function according to the power capability limit of the current unit in the throttling frequency modulation increase direction, if yes, performing the next step, and otherwise, stopping modulation; calculating the override amount of a deaerator regulating valve according to the condensed water flow that needs to be changed, the current unit load and the flow characteristic of a deaerator door; and in the water level regulating mode of the deaerator water level regulating valve, controlling the deaerator regulating valve to the corresponding opening degree according to the override amount. The scheme of the invention can quickly improve the ability of a steam turbine with small throttling loss to work upwards to respond to the primary frequency modulation of a power grid in the case of ensuring the existing operating parameters and working conditions.

Description

technical field [0001] The invention belongs to the technical field of control of coal-fired thermal power units, and in particular relates to a condensed water auxiliary frequency modulation control method and system for one-way precise control. Background technique [0002] With the development of society, the economic requirements for power generation of thermal power units are also getting higher and higher. In order to improve the coal consumption of coal-fired generating units, steam turbine flow modification is a widely used technology. At the same time, various newly-built units will also reduce the throttling loss of steam turbines under normal operating conditions as one of the important means to improve the economical efficiency of steam turbine power generation. [0003] The current primary frequency modulation auxiliary control methods are various, each with its own characteristics. Applicable unit types, working conditions and effects on the primary frequency...

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Problems solved by technology

[0004] In addition, in order to quickly use condensed water to assist load reduction, it is required to quickly add condensed water to the deaerator, which will destroy the balance of the water in and out of the deaerator, causing the water level of the deaerator to increase rapidly, and the water level of the deaerator is too high and there will be a trip danger

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