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Rapid evaluation method based on primary frequency modulation

An evaluation method and rapid technology, applied in the direction of AC network circuits, electrical components, circuit devices, etc., can solve problems such as difficulties, missing the best time to analyze data, failing to reflect the real-time operation of the unit, etc., to improve the rationality , the effect of avoiding analysis errors

Active Publication Date: 2019-03-12
ELECTRIC POWER SCI & RES INST OF STATE GRID TIANJIN ELECTRIC POWER CO +2
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Problems solved by technology

For a frequency modulation rapid evaluation, relevant performance analysis has not been carried out at present. A frequency modulation test analysis mainly relies on the summary of test data, which fails to reflect the real-time operation of the unit, especially during the period of power grid frequency fluctuations, it is impossible to use real and effective data for frequency modulation rapidity Analysis, the long data collection stage and the layer-by-layer reporting mechanism miss the best time to analyze data. Data analysis may have subjective factors, which causes many difficulties for a frequency modulation analysis. Based on this, a rapid evaluation based on a frequency modulation is proposed. method to provide important data for the scientific analysis of the rapidity of generator set frequency modulation

Method used

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  • Rapid evaluation method based on primary frequency modulation

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Embodiment Construction

[0032] The present invention is further described in detail through the following examples, but the technical content described in this example is illustrative rather than limiting, and should not limit the protection scope of the present invention accordingly.

[0033] A method based on primary frequency modulation rapidity evaluation, the innovation of the present invention lies in: comprising the following steps:

[0034] (1) Timely collect the speed of the steam turbine of the grid-connected unit, and convert the speed into the grid frequency;

[0035] (2) Calculate the deviation between the grid frequency and the standard frequency, and perform absolute value calculation on the result;

[0036] (3) When the absolute value of the deviation is greater than the set value, enter the next step;

[0037] Otherwise, go back to step ⑴;

[0038] (4) When the absolute value of the deviation decreases to the set value, the evaluation of this stage is over, and the time length of t...

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Abstract

The invention relates to a rapid evaluation method based on primary frequency modulation. A 15-second response value and a theoretical value are calculated by adopting a mean value of frequency changes of first 15 seconds as a reference, and the hysteresis of fast response of the frequency of a unit is considered; and a 30-second response value and a theoretical value are calculated by adopting apeak value of frequency changes of first 30 seconds as a reference, so that an analysis error caused by frequency falling is avoided. According to the method, in order to avoid frequent calculation, according to conventional unit frequency modulation test characteristics, a fast frequency modulation characteristic can be fully embodied after 15 seconds, so that the shortest length of an evaluationtime period is set, and the reasonability of statistical data can be improved; calculation time of the unit exceeds 15s and does not reach 30s, and only 15s calculation data is used for replacing twopieces of data; and if a sampling duration is longer than 30s, current calculation can be completed only after the actual frequency falls back into a dead zone, and a theoretical action value takes the peak value of the whole time period for reference.

Description

technical field [0001] The invention belongs to the technical field of rapidity evaluation of frequency modulation, and in particular relates to a rapidity evaluation method based on primary frequency modulation. Background technique [0002] With the increase of load and the increasing scale of the power grid, under the new situation of the interconnection of UHV power grid and regional power grid, the primary frequency regulation function of the unit can quickly respond to sudden changes in power grid power, and can significantly improve the frequency quality of the power grid. In the safe and stable operation of the power grid play a pivotal role. For a frequency modulation rapidity evaluation, relevant performance analysis work has not been carried out at present. A frequency modulation test analysis is mainly based on the summary of test data, which fails to reflect the real-time operation of the unit, especially during the frequency fluctuation period of the power grid...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/00H02J3/38
CPCH02J3/00H02J3/381H02J2203/20
Inventor 赵毅张长志李浩然倪玮晨王建军周连升甘智勇张应田郑卫洪曹晓男杜岩郭凌旭鄂志君陈天恒杨晓静段建勋冯长强张志良沙威欧阳佳慧
Owner ELECTRIC POWER SCI & RES INST OF STATE GRID TIANJIN ELECTRIC POWER CO
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