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Method and system for coordinately controlling primary frequency modulation and AGC of hydroelectric generating set

A hydroelectric unit, coordinated control technology, applied in the field of power systems, can solve problems such as unaccounted for coordinated control problems, different control objectives, response time and response speed, etc.

Active Publication Date: 2020-05-01
CHINA ELECTRIC POWER RES INST +1
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Problems solved by technology

However, the coordinated control between the AGC setting value and the primary frequency modulation variation is not considered. AGC and primary frequency modulation are controlled in different time domains, and their control objectives, response time and response speed are also different.

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  • Method and system for coordinately controlling primary frequency modulation and AGC of hydroelectric generating set
  • Method and system for coordinately controlling primary frequency modulation and AGC of hydroelectric generating set
  • Method and system for coordinately controlling primary frequency modulation and AGC of hydroelectric generating set

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Embodiment Construction

[0036] Exemplary embodiments of the present invention will now be described with reference to the accompanying drawings, however, the present invention may be embodied in many different forms and is not limited to the embodiments described herein, which are provided for this thorough and complete disclosure 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 are not intended to limit the invention. In the drawings, the same elements / elements are given the same reference numerals.

[0037] Unless otherwise defined, terms (including scientific and technical terms) used herein have the commonly understood meanings to those skilled in the art. In addition, it is to be understood that terms defined in commonly used dictionaries should be construed as having meanings consistent with the context in the related art, and should not be construed as idealized or overly formal meanings.

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Abstract

The invention discloses a method and system for coordinately controlling primary frequency modulation and AGC of a hydroelectric generating set and belongs to the technical field of a power system. The method comprises steps of determining transmission power changes in tie lines of different regions of an interconnected power grid, and determining frequency changes of the hydroelectric generatingset according to the transmission power changes; determining a hydroelectric generating set speed regulation system load frequency response coefficient of the hydroelectric generating set speed regulation system after primary frequency modulation according to the frequency change of the hydroelectric generating set; adding a frequency modulation power correction value to a frequency modulation power preset value of secondary frequency modulation of the hydroelectric generating set speed regulation system, and performing secondary frequency modulation; determining whether the frequency modulation power of the secondary frequency modulation counteracts the frequency modulation power of the primary frequency modulation, and whether the frequency deviation of the hydroelectric generating set after the secondary frequency modulation is finished is 0; and converting an AGC power closed-loop control chart to obtain a corrected AGC power closed-loop regulation improved chart, and carrying outAGC control. The method is advantaged in that adjustment errors caused by the fact that the primary frequency modulation effect is counteracted by secondary power adjustment are avoided.

Description

technical field [0001] The present invention relates to the technical field of power systems, and more particularly, to a method and system for coordinating control of primary frequency regulation and AGC of a hydroelectric unit. Background technique [0002] In order to solve the risk of ultra-low frequency oscillation in the hydropower system with a high proportion of the typical operation mode of the Southwest Power Grid, the adaptive optimization of the speed control system of the hydropower unit is usually carried out. The frequency fluctuation range and frequency limit of the power grid have increased, the number of times the frequency has crossed the dead zone of primary frequency regulation and secondary frequency regulation has increased, and the problem of inconsistency between the primary frequency regulation of the generator set and the automatic generation control (AGC) action characteristics of the grid has become prominent; at the same time, the power plant mon...

Claims

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Application Information

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IPC IPC(8): H02J3/24H02J3/46
CPCH02J3/24H02J3/46
Inventor 王官宏艾东平张坤俊李莹李文锋杨超魏巍陶向宇
Owner CHINA ELECTRIC POWER RES INST
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