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On-line evaluation method of primary frequency modulation based on wams to filter out the influence of agc

An evaluation method and filtering technology, which is applied in the direction of measuring devices, instruments, measuring electronics, etc., can solve the problems of not being able to truly reflect the situation of a frequency modulation action of a power plant, the reliability of the result is reduced, and the inability to run online, etc., to achieve a frequency modulation result Accurate, accurate calculation results, high collection density effect

Active Publication Date: 2015-10-28
CHINA EPRI SCIENCE & TECHNOLOGY CO LTD +2
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  • Application Information

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Problems solved by technology

For the handling of this situation, some power grid companies do not consider the influence of AGC, but directly calculate the frequency modulation performance, which greatly reduces the credibility of the results, and may lead to conclusions contrary to the facts; the other part uses the AGC command signal of the EMS system , will be excluded by the power plant that issued the AGC instruction, and will not be assessed
Neither of these two methods can truly reflect the situation of a frequency regulation operation of the power plant, and there are great limitations
[0006] 3. It cannot be operated online, and operators need to retrieve offline data and manually calculate offline. Generally, after a large frequency fluctuation occurs in the power grid, the power grid company uses the frequency before and after the accident and the output of the unit to perform offline calculations, and qualitatively evaluates the primary frequency regulation of the unit. performance, the method is only suitable for the purpose of spot checking

Method used

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  • On-line evaluation method of primary frequency modulation based on wams to filter out the influence of agc

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Embodiment

[0041] Such as figure 1 Shown: Various curves include the original active power curve, the filtered active power curve, the active power curve and the frequency curve after filtering out the influence of AGC.

[0042] The frequency fluctuates at the moment of the leftmost vertical line, and the frequency decreases. Once the frequency is adjusted, the active power should increase the output. From the green curve that has never filtered out the AGC command, active power does not increase the output, but reduces the output. From the surface phenomenon, if a frequency regulation action is wrong, the power plant will be punished accordingly.

[0043] Judging from the active power curve before the start of a frequency modulation, the filtered active power curve has already shown a downward trend, but under normal circumstances the active power curve should approximate a straight line. Through corresponding calculations, it can be judged that there is an AGC command issued at this ti...

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Abstract

The invention relates to an on-line evaluation method for primary frequency modulation based on WAMS to filter out the influence of AGC. The method uses WAMS data for calculation and analysis; the method can automatically filter out the influence of AGC in the process of primary frequency modulation analysis; the method includes the following steps: monitoring the frequency of a generating set , to determine whether a frequency disturbance occurs; monitor the frequency of the generator set after the frequency disturbance, and determine whether a frequency modulation is over; monitor the unit power, and determine whether the power responds; use the data before the start of a frequency modulation to determine whether there is an AGC command; calculate a frequency modulation performance parameter, and Check the primary frequency regulation parameters, and finally store the results in the database; this method uses the advanced WAMS system data calculation, and proposes a method to filter out the influence of AGC. Good results have been obtained in the application.

Description

technical field [0001] The invention relates to an online monitoring and evaluation method in the field of electric power system and automation thereof, in particular to an online evaluation method for primary frequency modulation based on WAMS to filter out the influence of AGC. Background technique [0002] With the continuous increase of unit capacity and the further deepening of the market economy, power users have higher and higher requirements for power reliability, especially stability. High-quality, reliable and stable power supply has become a common demand of users. Among them, the primary frequency regulation function of the generator set is very important to maintain frequency stability. When the grid frequency deviates from the rated value, the generator set regulation control system automatically controls the increase (when the frequency drops) or decreases (when the frequency rises) of the active power of the generator set, so that the grid frequency quickly r...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R31/00
Inventor 李倩许勇赵恩东施秀萍
Owner CHINA EPRI SCIENCE & TECHNOLOGY CO LTD
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