CN-122019960-A - Method and device for cleaning harmonic data at network side of high-voltage direct-current converter station

CN122019960ACN 122019960 ACN122019960 ACN 122019960ACN-122019960-A

Abstract

The invention relates to the technical field of power distribution network harmonic impedance identification, and particularly provides a method and a device for cleaning harmonic data on a network side of a high-voltage direct current converter station. According to the technical scheme provided by the invention, the linear relation between the harmonic voltage and the harmonic current of the power distribution network is considered, the linear relation between the harmonic voltage and the harmonic current data is analyzed by adopting a correlation analysis method, the usability of the harmonic voltage and the harmonic current data can be improved, the quality of data cleaning is improved, and the impedance characteristic analysis of the power distribution network is supported.

Inventors

LI ZHAOLIANG
QI GEQING
GAO QIAN
ZHANG MIAO
ZHANG TIANLONG
ZHANG NAN
LI YAQIONG
ZHAO LEI
LI FANGYI
LIU HAIJUN
MU XIAOBIN
WANG ZHIKAI
WANG TONGXUN
ZHOU SHENGJUN

Assignees

中国电力科学研究院有限公司
国网辽宁省电力有限公司大连供电公司
国家电网有限公司

Dates

Publication Date: 20260512
Application Date: 20251203

Claims (14)

1. The method for cleaning the harmonic data at the network side of the high-voltage direct-current converter station is characterized by comprising the following steps: Initializing the data cleaning window length to be the initial window length; And cleaning the harmonic data of the monitoring point in the initial window length based on the correlation coefficient between the harmonic data mean value of the monitoring point in the initial window length and the harmonic data.
2. The method of claim 1, wherein the data cleansing of the harmonic data for the monitoring point within the initial window length based on a correlation coefficient between a harmonic data mean and the harmonic data for the monitoring point within the initial window length comprises: determining a correlation coefficient between harmonic data mean values and harmonic data of monitoring points in the initial window length; When the correlation coefficient exceeds a preset upper limit, harmonic data in the initial window length are reserved, when the correlation coefficient is smaller than a preset lower limit, the harmonic data in the initial window length are deleted, when the correlation coefficient is between the preset lower limit and the preset upper limit, the initial window length is equally divided into a first window length and a second window length, and after the first window length and the second window length are respectively made to be the data cleaning window length, the initialization data cleaning window length is returned to be the initial window length.
3. The method of claim 1, wherein the harmonic data mean of the monitoring point over an initial window length is as follows: In the above-mentioned method, the step of, To monitor the average value of the h harmonic voltage at the point within the initial window length, To monitor the nth data point for the nth harmonic voltage with the point within the initial window length, Is the initial window length.
4. The method of claim 3, wherein the harmonic data mean of the monitoring point over the initial window length is as follows: In the above-mentioned method, the step of, To monitor the average value of the h harmonic current at a point within the initial window length, To monitor the nth data point nth harmonic current for points within the initial window length, Is the initial window length.
5. The method of claim 4, wherein a correlation coefficient between harmonic data means and harmonic data for the monitoring point within an initial window length is as follows: In the above-mentioned method, the step of, And the correlation coefficient between the average value of the h-th harmonic data of the monitoring point in the initial window length and the h-th harmonic data is obtained.
6. The method of claim 2, wherein the correlation coefficient between the harmonic data mean and the harmonic data for the monitoring point within the initial window length ranges from-1 to 1, the preset lower limit is-0.3, and the preset upper limit is 0.8.
7. A high voltage dc converter station network side harmonic data cleaning device, the device comprising: the initialization module is used for initializing the data cleaning window length to be the initial window length; and the cleaning module is used for cleaning the harmonic data of the monitoring point in the initial window length based on the correlation coefficient between the harmonic data mean value of the monitoring point in the initial window length and the harmonic data.
8. The apparatus of claim 7, wherein the data cleansing of the harmonic data for the monitoring point within the initial window length based on a correlation coefficient between a harmonic data mean and the harmonic data for the monitoring point within the initial window length comprises: determining a correlation coefficient between harmonic data mean values and harmonic data of monitoring points in the initial window length; When the correlation coefficient exceeds a preset upper limit, harmonic data in the initial window length are reserved, when the correlation coefficient is smaller than a preset lower limit, the harmonic data in the initial window length are deleted, when the correlation coefficient is between the preset lower limit and the preset upper limit, the initial window length is equally divided into a first window length and a second window length, and after the first window length and the second window length are respectively made to be the data cleaning window length, the initialization data cleaning window length is returned to be the initial window length.
9. The apparatus of claim 7, wherein the harmonic data mean of the monitoring point over an initial window length is as follows: In the above-mentioned method, the step of, To monitor the average value of the h harmonic voltage at the point within the initial window length, To monitor the nth data point for the nth harmonic voltage with the point within the initial window length, Is the initial window length.
10. The apparatus of claim 9, wherein the harmonic data mean of the monitoring point over an initial window length is as follows: In the above-mentioned method, the step of, To monitor the average value of the h harmonic current at a point within the initial window length, To monitor the nth data point nth harmonic current for points within the initial window length, Is the initial window length.
11. The apparatus of claim 10, wherein a correlation coefficient between harmonic data means and harmonic data for the monitoring point within an initial window length is as follows: In the above-mentioned method, the step of, And the correlation coefficient between the average value of the h-th harmonic data of the monitoring point in the initial window length and the h-th harmonic data is obtained.
12. The apparatus of claim 8, wherein a correlation coefficient between harmonic data means and harmonic data for the monitoring point within an initial window length ranges from-1 to 1, the preset lower limit is-0.3, and the preset upper limit is 0.8.
13. A computer device, comprising: one or more processors; the processor is used for executing one or more programs; the network side harmonic data cleaning method of a hvdc converter station according to any of claims 1 to 6 is achieved when said one or more programs are executed by said one or more processors.
14. A computer readable storage medium, having stored thereon a computer program which, when executed, implements the method for cleaning harmonic data on the network side of a hvdc converter station according to any one of claims 1 to 6.

Description

Method and device for cleaning harmonic data at network side of high-voltage direct-current converter station Technical Field The invention relates to the technical field of harmonic impedance identification of distribution networks, in particular to a method and a device for cleaning harmonic data at the network side of a high-voltage direct-current converter station. Background A linear relation exists between harmonic voltage and harmonic current of the power distribution network, and the relation is a basis for identifying harmonic impedance of the power distribution network. Novel power electronic loads such as large-scale distributed new energy, electric automobiles and the like are widely connected, so that the harmonic voltage and current of the power distribution network show randomness, volatility and timeliness. The linear relation between the two is destroyed, the accuracy of harmonic impedance identification is reduced, and the accurate analysis of harmonic interaction characteristics of the converter station and the power distribution network is finally affected. At present, aiming at harmonic voltage and harmonic current data of a power distribution network, the influence of white noise on impedance identification is reduced usually by means of low-pass filtering, band-pass filtering and the like, and the linear relation between the harmonic voltage and the harmonic current of the power distribution network is not considered, so that the filtering precision is low and the linear relation between the harmonic voltage and the harmonic current is destroyed, thereby influencing the precision of the harmonic impedance identification of the power distribution network and the application of the harmonic impedance identification in practical scenes. Therefore, in the power distribution network harmonic impedance identification scene, how to consider the linear relation between the power distribution network harmonic voltage and the harmonic current improves the usability of measurement data through data cleaning, and becomes a key link for improving the power distribution network harmonic impedance identification precision and supporting the power distribution network impedance characteristic analysis. Disclosure of Invention In order to overcome the defects, the invention provides a method and a device for cleaning harmonic data at the network side of a high-voltage direct-current converter station. In a first aspect, a method for cleaning harmonic data on a network side of a high-voltage direct-current converter station is provided, where the method for cleaning harmonic data on a network side of a high-voltage direct-current converter station includes: Initializing the data cleaning window length to be the initial window length; And cleaning the harmonic data of the monitoring point in the initial window length based on the correlation coefficient between the harmonic data mean value of the monitoring point in the initial window length and the harmonic data. Preferably, the data cleaning of the harmonic data of the monitoring point in the initial window length based on the correlation coefficient between the harmonic data mean value of the monitoring point in the initial window length and the harmonic data comprises the following steps: determining a correlation coefficient between harmonic data mean values and harmonic data of monitoring points in the initial window length; When the correlation coefficient exceeds a preset upper limit, harmonic data in the initial window length are reserved, when the correlation coefficient is smaller than a preset lower limit, the harmonic data in the initial window length are deleted, when the correlation coefficient is between the preset lower limit and the preset upper limit, the initial window length is equally divided into a first window length and a second window length, and after the first window length and the second window length are respectively made to be the data cleaning window length, the initialization data cleaning window length is returned to be the initial window length. Preferably, the harmonic data mean value of the monitoring point in the initial window length is as follows: In the above-mentioned method, the step of, To monitor the average value of the h harmonic voltage at the point within the initial window length,To monitor the nth data point for the nth harmonic voltage with the point within the initial window length,Is the initial window length. Further, the harmonic data mean value of the monitoring point in the initial window length is as follows: In the above-mentioned method, the step of, To monitor the average value of the h harmonic current at a point within the initial window length,To monitor the nth data point nth harmonic current for points within the initial window length,Is the initial window length. Further, the correlation coefficient between the harmonic data mean value of the monitoring point in the initial window lengt