Thermal power generating unit primary frequency modulation control method and system

A technology for a thermal power unit and a control method, which is applied to electrical components, circuit devices, AC network circuits, etc., can solve the problems of fast power regulation of thermal power units, unfavorable system frequency recovery, and inability to identify drop depths early, so as to improve the primary frequency modulation. Adjust the speed, improve the stability characteristics, and facilitate the recovery effect

Pending Publication Date: 2020-10-09
STATE GRID HENAN ELECTRIC POWER ELECTRIC POWER SCI RES INST +1
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  • Claims
  • Application Information

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Problems solved by technology

[0005] The technical problem to be solved by the present invention is: in the prior art, due to the fast power adjustment speed of the thermal power unit, the drop depth of the system frequency cannot be identified early, and the frequency modulation function is performed after waiting for the system frequency to drop, which is not conducive to the recovery of the system frequency The problem

Method used

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  • Thermal power generating unit primary frequency modulation control method and system
  • Thermal power generating unit primary frequency modulation control method and system
  • Thermal power generating unit primary frequency modulation control method and system

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Embodiment 1

[0026] This embodiment provides a control method for primary frequency modulation of a thermal power unit, such as image 3 shown, including:

[0027] S1: When a disturbance occurs inside the power grid where the thermal power unit is located, calculate the frequency change rate of the power grid after the power grid where the thermal power unit is located exceeds the preset disturbance time;

[0028] S2: When the collected real-time grid frequency is less than the preset large disturbance frequency modulation dead zone, or the grid frequency change rate is less than the preset large disturbance frequency change rate, the frequency difference of the grid is used as input to perform small disturbance frequency modulation control;

[0029] S3: When the collected real-time grid frequency is greater than the preset large-disturbance frequency modulation dead zone, and the grid frequency change rate is greater than the preset large-disturbance frequency change rate, issue the large...

Embodiment 2

[0051] This embodiment provides a control system for primary frequency modulation of a thermal power unit, including:

[0052] The data acquisition module is used to calculate the corresponding frequency change rate of the power grid after the power grid where the thermal power unit is located reaches a preset disturbance time when a disturbance occurs inside the power grid where the thermal power unit is located;

[0053] The small-disturbance frequency modulation control module is used to use the grid frequency difference as input when the collected real-time grid frequency is less than the preset large-disturbance frequency modulation dead zone, or the grid frequency change rate is less than the preset large-disturbance frequency change rate. Small disturbance frequency modulation control;

[0054] A large disturbance frequency modulation control module, configured to issue large disturbance primary frequency modulation power when the collected real-time grid frequency is g...

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Abstract

The invention relates to a thermal power generating unit primary frequency modulation control method and a system. The thermal power generating unit primary frequency modulation control method comprises the steps of: carrying out primary frequency modulation through employing a power grid frequency difference as an input when small frequency disturbances occur in the system; and when large frequency disturbance occur in the system, carrying out primary frequency modulation by taking a power grid frequency difference change rate as input. Differential control over small disturbance and large disturbance of the frequency can be achieved, the process of waiting for system frequency reduction is not needed, the primary frequency modulation adjusting speed of a thermal power generating unit isgreatly increased, and the system frequency is improved. According to the thermal power generating unit primary frequency modulation control method and the system, problems that due to the fact that the power adjusting speed of a thermal power generating unit is high, the falling depth of system frequency cannot be recognized as soon as possible, frequency modulation is conducted after the systemfrequency is lowered, and system frequency recovery is not facilitated in the prior art are solved.

Description

technical field [0001] The application belongs to the technical field of power grid primary frequency regulation, and in particular relates to a control method and system for thermal power unit primary frequency regulation. Background technique [0002] Primary frequency regulation means that when the grid frequency exceeds the specified normal range, the change of the grid frequency will make the speed control system of each unit participating in the primary frequency regulation in the grid automatically increase or decrease the power of the unit according to the change of the grid frequency, so as to achieve a new The balance of the grid and the function of limiting the change of the grid frequency within a certain range. The primary frequency regulation function is an important means to maintain the stability of the power grid. [0003] Thermal power units are the main power source in our country, especially in the eastern receiving power grid, which is connected to a la...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/24
CPCH02J3/241
Inventor 谢伟胡玉霞罗从凯陈二强张小科梁涛李炎炎
Owner STATE GRID HENAN ELECTRIC POWER ELECTRIC POWER SCI RES INST
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