Transformer station background harmonic assessment method
A background harmonic and substation technology, applied in the field of substation background harmonic evaluation, can solve the problem of large background harmonic estimation error
Active Publication Date: 2017-06-20
ELECTRIC POWER RES INST STATE GRID SHANXI ELECTRIC POWER +1
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In addition, the existing background harmonic calculation methods mainly include the fluctuation method, linear regression method, etc. For the time period when the three-phase load changes do not meet the algorithm requirements, the background harmonic estimation error is relatively large; at the same time, for the electrified railway load, Negative sequence evaluation is also particularly important after it is connected to the grid
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[0073] The examples will be described in detail below in conjunction with the accompanying drawings. It should be emphasized that the following descriptions are only illustrative, and not intended to limit the scope and application of the present invention.
[0074] The present invention provides the specific implementation process of the system background harmonic evaluation method, and the simplified model diagram of the system is as follows figure 1 as shown, figure 2 It is the specific flow chart of the substation background harmonic evaluation method, specifically:
[0075] If only monitoring points are set at substation A, then
[0076] Step 1: Obtain the voltage and current data of point A;
[0077] Step 2: Divide the monitoring time by hour, that is, 00:00-01:00, 01:00-02:00, ..., 23:00-24:00, calculate the CV value of the monitoring data per hour, if CV≥ α (the recommended value of α is 10%), the load has large fluctuations, otherwise, the load fluctuations are sm...
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The invention belongs to the technical field of electric energy quality assessment and particularly relates to a transformer station background harmonic assessment method. The method concretely comprises steps of 1, obtaining monitoring data of an A point if a system is provided with a monitoring point only at an A position, analyzing the data, using different methods for background harmonic assessment according to the load changing condition at the A point, calculating the background harmonic voltages in one month of the A point, averaging the background harmonic voltages and taking the average as the background harmonic voltage during this period, and updating the background harmonic of the A point; and 2, obtaining monitoring data at the monitoring points of A and F if the system is provided with monitoring points at the transformer station A and the important load outlet F, calculating the background harmonic voltage at the monitoring point A, the load at the monitoring point F being an electric railway load, considering intermittence, impact and single phase rectification thereof, and carrying out the background harmonic and negative sequence assessment. The method provides a new thinking for background harmonic calculation when the monitoring data cannot meet requirements of the conventional algorithm.
Description
technical field [0001] The invention belongs to the technical field of electric energy quality evaluation, in particular to a substation background harmonic evaluation method. Background technique [0002] There are a large number of nonlinear loads in the power grid, such as electric locomotives, electric arc furnaces, rolling mills, and intermediate frequency furnaces. The three phases on the side are unbalanced. Accurate assessment of background harmonics on the system side is of great significance for the division of harmonic responsibilities. [0003] For the calculation of background harmonics, most of the existing methods use the voltage and current data monitored at a certain monitoring point to calculate. However, for substations with important loads, the monitoring point may Adding monitoring points and using the monitoring information of multiple monitoring points to estimate the background harmonics of the substation can provide a more comprehensive understandi...
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IPC IPC(8): G01R23/16
CPCG01R23/16
Inventor 王金浩雷达李慧蓬王康宁吴玉龙安勤岗宋述勇李胜文杨超颖徐龙张敏杜慧杰冯磊王龙杨赟磊常潇张世峰肖莹吕晓慧徐永海王亚奇
Owner ELECTRIC POWER RES INST STATE GRID SHANXI ELECTRIC POWER