Control method and system for primary frequency modulation of thermal generating units

A thermal power generation unit and control method technology, applied in the direction of reducing/preventing power oscillation, etc., can solve the problems of long duration of frequency modulation, limited adjustable margin, unable to meet the requirements of power grid safety and stable operation, etc., to improve frequency modulation accuracy and range, improve stability and safety, and improve the working ability of working medium
CN110212552AActive Publication Date: 2019-09-06CHINA SHENHUA ENERGY CO LTD +3
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
CHINA SHENHUA ENERGY CO LTD
Publication Date
2019-09-06

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Abstract

The embodiment of the invention relates to the technical field of thermal power generation control, and provides a control method and a system for primary frequency modulation of thermal generating units. The control method comprises the following steps: a frequency difference of a power grid is obtained; it is determined whether the reduction amplitude of the power grid frequency exceeds a presetrange according to the frequency difference of the power grid; if not, the primary frequency modulation based on boiler energy storage is performed on the units; and if so, the primary frequency modulation based on a feedwater bias optimization logic and a condensate throttling optimization logic is performed on the units; wherein, the feedwater bias optimization logic is used to increase the feedwater quantity of the boiler; and the condensate throttling optimization logic is used to reduce the opening degree of a water valve on a deaerator. In the embodiment of the invention, when the frequency of the power grid decreases greatly, the main steam pressure and the work capacity of working medium are improved by the two methods of increasing the feedwater quantity through the feedwater bias and reducing the condensate flow through the condensate throttling; steam extraction capacity of a turbine is reduced to improve the work of the working medium; and the frequency modulation accuracyand amplitude of the primary frequency modulation are improved.
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Description

technical field

[0001] The invention relates to the technical field of thermal power generation control, in particular to a control method and system for primary frequency modulation of a thermal power generating set. Background technique

[0002] The grid frequency reflects the balance relationship between the power generation on the power generation side and the power load on the power consumption side. When the generated power is equal to the electric load, the frequency of the grid is stable; when the generated power is greater than the load, the frequency of the grid increases; when the generated power is smaller than the load, the frequency of the grid decreases. The grid frequency is an important quality index for evaluating power quality, which is related to the safety and reliability of the grid. Therefore, ensuring the stability of the grid frequency is an important task for the operation of the power system. According to the adjustment range and adjustment abilit...

Claims

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