CN-121995150-A - Line loss analysis method, device, computer equipment, storage medium and computer program product based on power decomposition principle

CN121995150ACN 121995150 ACN121995150 ACN 121995150ACN-121995150-A

Abstract

The application relates to a line loss analysis method, a line loss analysis device, a line loss analysis computer device, a line loss storage medium and a line loss analysis computer program product based on a power decomposition principle. The method comprises the steps of determining a line loss conversion coefficient of a power transmission line to be analyzed according to a fundamental frequency active power value sequence, a fundamental frequency reactive power value sequence, a fundamental frequency unbalanced power value sequence, a harmonic distortion power value sequence and a voltage effective value sequence of the power transmission line to be analyzed in a preset measurement period, obtaining the line loss value of the power transmission line to be analyzed in the preset measurement period, determining a line equivalent resistance value of the power transmission line to be analyzed according to the line loss value and the line loss conversion coefficient, and obtaining a line loss analysis result of the power transmission line to be analyzed based on the fundamental frequency active power value sequence, the fundamental frequency reactive power value sequence, the fundamental frequency unbalanced power value sequence, the harmonic distortion power value sequence, the voltage effective value sequence and the line equivalent resistance value. By adopting the method, the line loss analysis accuracy of the power transmission line can be improved.

Inventors

LUO YI
QIAN BIN
LI FUSHENG
LIN WEIBIN
LU YUXIN

Assignees

南方电网科学研究院有限责任公司

Dates

Publication Date: 20260508
Application Date: 20260410

Claims (10)

1. The line loss analysis method based on the power decomposition principle is characterized by comprising the following steps of: Acquiring a fundamental frequency active power value sequence, a fundamental frequency reactive power value sequence, a fundamental frequency unbalanced power value sequence, a harmonic distortion power value sequence and a voltage effective value sequence of a transmission line to be analyzed in a preset measurement period; Determining a line loss conversion coefficient of the power transmission line to be analyzed according to the fundamental frequency active power value sequence, the fundamental frequency reactive power value sequence, the fundamental frequency unbalanced power value sequence, the harmonic distortion power value sequence and the voltage effective value sequence; Acquiring a line loss value of the power transmission line to be analyzed in the preset measurement period, and determining a line equivalent resistance value of the power transmission line to be analyzed according to the line loss value and the line loss conversion coefficient; And obtaining a line loss analysis result of the power transmission line to be analyzed based on the fundamental frequency active power value sequence, the fundamental frequency reactive power value sequence, the fundamental frequency unbalanced power value sequence, the harmonic distortion power value sequence, the voltage effective value sequence and the line equivalent resistance value.
2. The method according to claim 1, wherein determining the line loss conversion coefficient of the power transmission line to be analyzed according to the fundamental frequency active power value sequence, the fundamental frequency reactive power value sequence, the fundamental frequency unbalanced power value sequence, the harmonic distortion power value sequence, and the voltage effective value sequence comprises: Acquiring a first square value of the fundamental frequency active power value sequence, a second square value of the fundamental frequency reactive power value sequence, a third square value of the fundamental frequency unbalanced power value sequence, a fourth square value of the harmonic distortion power value sequence and a fifth square value of the voltage active value sequence; adding the first square value, the second square value, the third square value and the fourth square value to obtain a target square value of the power transmission line to be analyzed in the preset measurement period; Determining a bus loss conversion coefficient of the power transmission line to be analyzed, a first line loss conversion coefficient of the base frequency active power value sequence, a second line loss conversion coefficient of the base frequency reactive power value sequence, a third line loss conversion coefficient of the base frequency unbalanced power value sequence and a fourth line loss conversion coefficient of the harmonic distortion power value sequence according to the target square value, the first square value, the second square value, the third square value, the fourth square value and the fifth square value; And obtaining the line loss conversion coefficient of the power transmission line to be analyzed based on the bus loss conversion coefficient, the first line loss conversion coefficient, the second line loss conversion coefficient, the third line loss conversion coefficient and the fourth line loss conversion coefficient.
3. The method according to claim 2, wherein determining the bus loss conversion factor of the transmission line to be analyzed, the first line loss conversion factor of the base frequency active power value sequence, the second line loss conversion factor of the base frequency reactive power value sequence, the third line loss conversion factor of the base frequency unbalanced power value sequence, and the fourth line loss conversion factor of the harmonic distortion power value sequence according to the target square value, the first square value, the second square value, the third square value, the fourth square value, and the fifth square value comprises: Determining a first ratio between the target square value and the fifth square value, a second ratio between the first square value and the fifth square value, a third ratio between the second square value and the fifth square value, a fourth ratio between the third square value and the fifth square value, and a fifth ratio between the fourth square value and the fifth square value; And integrating the first ratio, the second ratio, the third ratio, the fourth ratio and the fifth ratio according to a preset integration processing period to obtain a bus loss conversion coefficient of the power transmission line to be analyzed, a first line loss conversion coefficient of the fundamental frequency active power value sequence, a second line loss conversion coefficient of the fundamental frequency reactive power value sequence, a third line loss conversion coefficient of the fundamental frequency unbalanced power value sequence and a fourth line loss conversion coefficient of the harmonic distortion power value sequence.
4. A method according to claim 3, wherein the obtaining the line loss analysis result of the power transmission line to be analyzed based on the fundamental frequency active power value sequence, the fundamental frequency reactive power value sequence, the fundamental frequency unbalanced power value sequence, the harmonic distortion power value sequence, the voltage effective value sequence and the line equivalent resistance value comprises: Integrating the second ratio according to the preset integration processing period, and taking the product between the integrated second ratio and the line equivalent resistance value as a first line loss contribution value of the fundamental frequency active power value sequence; Integrating the third ratio according to the preset integration processing period, and taking the product between the integrated third ratio and the line equivalent resistance value as a second line loss contribution value of the fundamental frequency reactive power value sequence; integrating the fourth ratio according to the preset integration processing period, and taking the product of the integrated fourth ratio and the line equivalent resistance value as a third line loss contribution value of the fundamental frequency unbalanced power value sequence; Integrating the fifth ratio according to the preset integration processing period, and taking the product between the integrated fifth ratio and the line equivalent resistance value as a fourth line loss contribution value of the harmonic distortion power value sequence; And obtaining a line loss analysis result of the power transmission line to be analyzed based on the first line loss contribution value, the second line loss contribution value, the third line loss contribution value and the fourth line loss contribution value.
5. The method according to claim 2, wherein the determining the line equivalent resistance value of the power transmission line to be analyzed according to the line loss value and the line loss conversion coefficient includes: Under the condition that the line loss conversion coefficient represents a bus loss conversion coefficient of one user power transmission line, obtaining a line equivalent resistance value of the one user power transmission line based on a ratio between the line loss value and the bus loss conversion coefficient of the one user power transmission line, and taking the line equivalent resistance value as the line equivalent resistance value of the power transmission line to be analyzed; and under the condition that the line loss conversion coefficient represents the bus loss conversion coefficient of a plurality of user power transmission lines, adopting an estimation algorithm to carry out estimation processing on the line loss value and the bus loss conversion coefficient of each user power transmission line to obtain a sub-line equivalent resistance value of each user power transmission line, and taking the sub-line equivalent resistance value as the line equivalent resistance value of the power transmission line to be analyzed.
6. The method of claim 5, wherein the estimating the line loss value and the bus loss conversion coefficient of each subscriber transmission line by using an estimation algorithm to obtain the sub-line equivalent resistance value of each subscriber transmission line comprises: Constructing a multi-element primary equation set based on the line loss value and the bus loss conversion coefficient of each user power transmission line; and solving the multi-element primary equation set by adopting a least square method or a robust weighted least square method to obtain the equivalent resistance value of the sub-line of each user power transmission line.
7. The method according to claim 1, wherein the obtaining a fundamental frequency active power value sequence, a fundamental frequency reactive power value sequence, a fundamental frequency unbalanced power value sequence, a harmonic distortion power value sequence and a voltage effective value sequence of the power transmission line to be analyzed in a preset measurement period includes: Acquiring a three-phase voltage value sequence and a three-phase current value sequence of the power transmission line to be analyzed in the preset measurement period; carrying out frequency domain decomposition processing on the three-phase voltage value sequence and the three-phase current value sequence respectively to obtain a fundamental wave voltage value and a harmonic wave voltage value of the power transmission line to be analyzed, and a fundamental wave current value and a harmonic wave current value of the power transmission line to be analyzed; Respectively carrying out component decomposition processing on the fundamental wave voltage value and the fundamental wave current value to obtain a positive sequence voltage component, a negative sequence voltage component and a zero sequence voltage component of the power transmission line to be analyzed, and a positive sequence current component, a negative sequence current component and a zero sequence current component of the power transmission line to be analyzed; and determining the fundamental frequency unbalance power value sequence according to a negative sequence voltage component, the zero sequence voltage component, the negative sequence current component and the zero sequence current component, and determining the harmonic distortion power value sequence according to the harmonic voltage value and the harmonic current value.
8. The method according to claim 7, wherein the frequency domain decomposition processing is performed on the three-phase voltage value sequence and the three-phase current value sequence to obtain a fundamental voltage value and a harmonic voltage value of the power transmission line to be analyzed, and the fundamental current value and the harmonic current value of the power transmission line to be analyzed, respectively, including: And carrying out frequency domain decomposition treatment on the three-phase voltage value sequence and the three-phase current value sequence by adopting a fast Fourier transform method or a wavelet packet decomposition method respectively to obtain a fundamental wave voltage value and a harmonic wave voltage value of the power transmission line to be analyzed, and a fundamental wave current value and a harmonic wave current value of the power transmission line to be analyzed.
9. A line loss analysis device based on a power decomposition principle, the device comprising: the data acquisition module is used for acquiring a fundamental frequency active power value sequence, a fundamental frequency reactive power value sequence, a fundamental frequency unbalanced power value sequence, a harmonic distortion power value sequence and a voltage effective value sequence of the power transmission line to be analyzed in a preset measurement period; The coefficient determining module is used for determining a line loss conversion coefficient of the power transmission line to be analyzed according to the fundamental frequency active power value sequence, the fundamental frequency reactive power value sequence, the fundamental frequency unbalanced power value sequence, the harmonic distortion power value sequence and the voltage effective value sequence; The resistance determining module is used for obtaining a line loss value of the power transmission line to be analyzed in the preset measurement period, and determining a line equivalent resistance value of the power transmission line to be analyzed according to the line loss value and the line loss conversion coefficient; and the result determining module is used for obtaining a line loss analysis result of the power transmission line to be analyzed based on the fundamental frequency active power value sequence, the fundamental frequency reactive power value sequence, the fundamental frequency unbalanced power value sequence, the harmonic distortion power value sequence, the voltage effective value sequence and the line equivalent resistance value.
10. A computer device comprising a memory and a processor, the memory storing a computer program, characterized in that the processor implements the steps of the method of any one of claims 1 to 8 when the computer program is executed.

Description

Line loss analysis method, device, computer equipment, storage medium and computer program product based on power decomposition principle Technical Field The present application relates to the field of power grid technologies, and in particular, to a line loss analysis method, a device, a computer readable storage medium and a computer program product based on a power decomposition principle. Background At present, in order to ensure the operation stability of a power transmission line, how to accurately analyze the line loss of the power transmission line is important. In the traditional technology, when the line loss analysis is carried out on the power transmission line, an analysis mode of a purchase-sale electricity quantity difference method is generally adopted, but the analysis mode is difficult to decouple the contribution of each power component, so that the accuracy of the line loss analysis of the power transmission line is lower. Disclosure of Invention In view of the foregoing, it is desirable to provide a line loss analysis method, apparatus, computer device, computer-readable storage medium, and computer program product based on a power decomposition principle, which can improve the accuracy of line loss analysis of a power transmission line. In a first aspect, the present application provides a line loss analysis method based on a power decomposition principle, including: Acquiring a fundamental frequency active power value sequence, a fundamental frequency reactive power value sequence, a fundamental frequency unbalanced power value sequence, a harmonic distortion power value sequence and a voltage effective value sequence of a transmission line to be analyzed in a preset measurement period; Determining a line loss conversion coefficient of the power transmission line to be analyzed according to the fundamental frequency active power value sequence, the fundamental frequency reactive power value sequence, the fundamental frequency unbalanced power value sequence, the harmonic distortion power value sequence and the voltage effective value sequence; Acquiring a line loss value of the power transmission line to be analyzed in the preset measurement period, and determining a line equivalent resistance value of the power transmission line to be analyzed according to the line loss value and the line loss conversion coefficient; And obtaining a line loss analysis result of the power transmission line to be analyzed based on the fundamental frequency active power value sequence, the fundamental frequency reactive power value sequence, the fundamental frequency unbalanced power value sequence, the harmonic distortion power value sequence, the voltage effective value sequence and the line equivalent resistance value. In one embodiment, the determining the line loss conversion coefficient of the power transmission line to be analyzed according to the fundamental frequency active power value sequence, the fundamental frequency reactive power value sequence, the fundamental frequency unbalanced power value sequence, the harmonic distortion power value sequence and the voltage effective value sequence includes: Acquiring a first square value of the fundamental frequency active power value sequence, a second square value of the fundamental frequency reactive power value sequence, a third square value of the fundamental frequency unbalanced power value sequence, a fourth square value of the harmonic distortion power value sequence and a fifth square value of the voltage active value sequence; adding the first square value, the second square value, the third square value and the fourth square value to obtain a target square value of the power transmission line to be analyzed in the preset measurement period; Determining a bus loss conversion coefficient of the power transmission line to be analyzed, a first line loss conversion coefficient of the base frequency active power value sequence, a second line loss conversion coefficient of the base frequency reactive power value sequence, a third line loss conversion coefficient of the base frequency unbalanced power value sequence and a fourth line loss conversion coefficient of the harmonic distortion power value sequence according to the target square value, the first square value, the second square value, the third square value, the fourth square value and the fifth square value; And obtaining the line loss conversion coefficient of the power transmission line to be analyzed based on the bus loss conversion coefficient, the first line loss conversion coefficient, the second line loss conversion coefficient, the third line loss conversion coefficient and the fourth line loss conversion coefficient. In one embodiment, the determining, according to the target square value, the first square value, the second square value, the third square value, the fourth square value, and the fifth square value, the bus loss conversion coefficient of the transmission line to