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Power grid frequency regulation and control method and system based on power grid frequency over-modulation and under-modulation analysis

A power grid frequency and frequency technology, applied in the field of power grid frequency control methods and systems, can solve the problems of high proportion of direct current transmission, large peak-to-valley difference rate, lack of method data analysis, etc., to reduce invalid adjustment, reduce the number of occurrences, Achieving process flexibility

Active Publication Date: 2020-11-24
YUNNAN POWER GRID
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] Due to the high proportion of direct current transmission, the changeable direct current operation mode, the large installed capacity of new energy in the province, and the significant difference in the power generation capacity of hydropower in the dry and flood seasons in the province, the peak-to-valley difference rate of the provincial-level asynchronous power grid in Yunnan is huge within the year and within the year. Significant differences in grid characteristics
[0003] Since the asynchronous network operation of the Yunnan Power Grid and the main grid of the Southern Power Grid, the parameters of the frequency regulation tool have been adjusted many times to adapt to the changes in the characteristics of the power grid. However, at present, the frequency regulation parameters are only fine-tuned based on the experience of experts, and there is a lack of specific methods and due data analysis. Provide a basis for formulating a reasonable frequency modulation method

Method used

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  • Power grid frequency regulation and control method and system based on power grid frequency over-modulation and under-modulation analysis
  • Power grid frequency regulation and control method and system based on power grid frequency over-modulation and under-modulation analysis
  • Power grid frequency regulation and control method and system based on power grid frequency over-modulation and under-modulation analysis

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Embodiment 1

[0036] A power grid frequency control method based on power grid frequency overshoot and undershoot analysis, comprising the following steps:

[0037] Step (1), using the SCADA system to obtain the system frequency within a set time to form a system frequency database;

[0038] Step (2), according to the system frequency database obtained in step (1) and the set upper and lower limit thresholds of over-under-tuning frequency, divide the frequency data interval, and obtain the data interval distribution map;

[0039] Step (3), according to the data interval distribution diagram obtained in step (2) and the set time limit for overshooting and undershooting, respectively calculate the number of overshoots and undershoots per unit time;

[0040] Step (4), according to the calculation result of step (3), compare the set reference value of overshoot and undershoot times, so as to determine whether there is overshoot or undershoot in the system frequency regulation.

[0041] Step (5...

Embodiment 2

[0043] A power grid frequency control method based on power grid frequency overshoot and undershoot analysis, comprising the following steps:

[0044] Step (1), using the SCADA system to obtain the system frequency within a set time to form a system frequency database;

[0045] Step (2), according to the system frequency database obtained in step (1) and the set upper and lower limit thresholds of over-under-tuning frequency, divide the frequency data interval, and obtain the data interval distribution map;

[0046] Step (3), according to the data interval distribution diagram obtained in step (2) and the set time limit for overshooting and undershooting, respectively calculate the number of overshoots and undershoots per unit time;

[0047] Step (4), according to the calculation result of step (3), compare the set reference value of overshoot and undershoot times, so as to determine whether there is overshoot or undershoot in the system frequency regulation.

[0048] Step (5...

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Abstract

The invention relates to a power grid frequency regulation and control method and system based on power grid frequency over-modulation and under-modulation analysis, and the method comprises the steps: obtaining system frequency in set time through an SCADA system, and forming a system frequency database; dividing frequency data intervals according to a system frequency database and set upper andlower limit threshold values of the over-modulation and under-modulation frequency to obtain a data interval distribution diagram; respectively calculating overshoot times and undershoot times in unittime according to the data interval distribution diagram and a set overshoot and undershoot judgment time limit; comparing the set overshoot and undershoot frequency reference values so as to judge whether overshoot and undershoot exist in system frequency regulation or not; and adjusting the parameters of the frequency modulation tool according to the judgment result so as to solve the problemsof overshoot and undershoot of the system. The method can accurately and effectively count system frequency over-modulation and under-modulation data, give system frequency regulation and control evaluation, reasonably adjust frequency modulation tool parameters according to an evaluation result, improve frequency modulation accuracy and effectiveness of the frequency modulation tool, and ensure normal, safe and stable power grid.

Description

technical field [0001] The invention belongs to the technical field of power system safety and stability monitoring, relates to SCADA-based frequency regulation and monitoring, and in particular to a power grid frequency regulation method and system based on power grid frequency overshoot and undershoot analysis oriented to a master dispatching station. Background technique [0002] Due to the high proportion of direct current transmission, the changeable direct current operation mode, the large installed capacity of new energy in the province, and the significant difference in the power generation capacity of hydropower in the dry and flood seasons in the province, the peak-to-valley difference rate of the provincial-level asynchronous power grid in Yunnan is huge within the year and within the year. The grid characteristics vary significantly. [0003] Since the asynchronous network operation of the Yunnan Power Grid and the main grid of the Southern Power Grid, the parame...

Claims

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Application Information

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IPC IPC(8): G06Q10/06G06Q50/06G06F30/20G06F113/04
CPCG06Q10/06312G06Q50/06G06F30/20G06F2113/04
Inventor 伞晨峻朱余启陈汝昌莫熙杨怀博赵海麟戈本星杜凡何进袁飞飞
Owner YUNNAN POWER GRID