A method and system for coordinating control of primary frequency modulation and AGC of hydroelectric unit
A hydroelectric unit and coordinated control technology, applied in the field of power system, can solve the problems of unconsidered coordination control, different control objectives, different response time and response speed, etc., to achieve the effect of avoiding adjustment errors
Active Publication Date: 2022-07-01
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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[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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The invention discloses a method and a system for coordinating control of primary frequency regulation and AGC of a hydroelectric unit, belonging to the technical field of electric power systems. The method of the invention includes: determining the transmission power change in the tie lines in different regions of the interconnected power grid, determining the frequency change of the hydroelectric unit according to the change of the transmission power; The load frequency response coefficient of the speed regulation system of the unit; add the frequency regulation power correction value to the predetermined value of the frequency regulation power of the secondary frequency regulation of the speed regulation system of the hydroelectric unit, and perform the secondary frequency regulation; determine whether the frequency regulation power of the secondary frequency regulation and the frequency regulation power of the primary frequency regulation are offset. , and whether the frequency and frequency deviation of the hydropower unit is 0 after the secondary frequency modulation is completed; transform the AGC power closed-loop control diagram, obtain the revised AGC power closed-loop adjustment improvement diagram, and perform AGC control. The invention avoids the adjustment error caused by the primary frequency modulation effect being offset by the secondary power adjustment.
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...
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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