Control method and system for distinguishing primary frequency modulation of hydroelectric generating set with small disturbance and large disturbance

A hydroelectric unit, large disturbance technology, applied in the direction of single net parallel feeding arrangement, reducing/preventing power oscillation, etc.

Inactive Publication Date: 2020-06-16
CHINA ELECTRIC POWER RES INST +1
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  • Abstract
  • Description
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Problems solved by technology

[0004] The technical solution of the present invention provides a control method and system for primary frequency modulation of hydroelectric units that distinguish between small di

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  • Control method and system for distinguishing primary frequency modulation of hydroelectric generating set with small disturbance and large disturbance
  • Control method and system for distinguishing primary frequency modulation of hydroelectric generating set with small disturbance and large disturbance
  • Control method and system for distinguishing primary frequency modulation of hydroelectric generating set with small disturbance and large disturbance

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Embodiment Construction

[0031] Exemplary embodiments of the present invention will now be described with reference to the drawings; however, the present invention may be embodied in many different forms and are not limited to the embodiments described herein, which are provided for the purpose of exhaustively and completely disclosing the present invention. invention and fully convey the scope of the invention to those skilled in the art. The terms used in the exemplary embodiments shown in the drawings do not limit the present invention. In the figures, the same units / elements are given the same reference numerals.

[0032] Unless otherwise specified, the terms (including scientific and technical terms) used herein have the commonly understood meanings to those skilled in the art. In addition, it can be understood that terms defined by commonly used dictionaries should be understood to have consistent meanings in the context of their related fields, and should not be understood as idealized or over...

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Abstract

The invention discloses a control method and system for distinguishing primary frequency modulation of a hydroelectric generating set with small disturbance and large disturbance. The method comprisesthe steps of calculating a frequency change curve of a power grid where the hydroelectric generating set is located along with different power imbalance faults, and obtaining the frequency change rate after the preset disturbance time according to the frequency change curve; when the system frequency input is greater than a predetermined large disturbance frequency difference dead zone and the frequency change rate is greater than a large disturbance change rate judgment value, outputting large disturbance primary frequency modulation power, and conducting system large disturbance frequency modulation control; and when the system frequency input is less than a predetermined large disturbance frequency difference dead zone or the frequency change rate is less than a large disturbance change rate judgment value, outputting common frequency modulation power, and carrying out system small disturbance frequency modulation control.

Description

technical field [0001] The present invention relates to the electrical technical field of power plants, and more specifically, to a control method and system for primary frequency regulation of a hydroelectric unit that distinguishes between small disturbances and large disturbances. Background technique [0002] my country's hydropower is mainly concentrated in the southwest region. In the southwest region, two DC centralized transmission power grids, the Southwest Power Grid of the State Grid and the Yunnan Power Grid of the Southern Power Grid, have been formed. When bipolar blocking occurs in DC, it is often necessary for the hydropower station to remove units of the same capacity. However, if the large-scale frequency adjustment capability of hydropower units is fully utilized, the recovery of system frequency can be greatly accelerated, and fewer units can be cut, or even no units can be cut. If it is necessary to quickly reduce the power of the hydroelectric unit in t...

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Application Information

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IPC IPC(8): H02J3/24H02J3/48
CPCH02J3/24H02J3/48
Inventor 陶向宇李文锋王官宏章泽生罗霖艾东平马世俊李莹魏巍贾媛周成杨超于大海黄兴
Owner CHINA ELECTRIC POWER RES INST
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