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A Dominant Harmonic Source Location and Harmonic Pollution Propagation Path Tracking Method

A positioning method and harmonic source technology, applied in the direction of fault location, fault detection according to conductor type, etc., can solve problems such as the implementation resistance of the positioning method

Active Publication Date: 2021-03-09
ELECTRIC POWER RES INST OF GUANGXI POWER GRID CO LTD
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  • Claims
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Problems solved by technology

However, most of the existing positioning methods based on wide-area measurement need to extract harmonic voltage phasors or current phasors as input, and rely heavily on synchronized phasor measurement devices. Phasor measurement devices are still limited by economic conditions, so the implementation of existing positioning methods is still subject to certain resistance

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  • A Dominant Harmonic Source Location and Harmonic Pollution Propagation Path Tracking Method

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Embodiment Construction

[0047] In order to better understand the present invention, the present invention will be further described below in conjunction with accompanying drawing and specific embodiment:

[0048] The specific parameters of the IEEE14-node distribution network system model used in this example can be found in Tables 1 to 3. The voltage reference is 18kV, and the rated power is 100MW. The schematic diagram of the system topology is as follows figure 1 shown. A dominant harmonic current source with an amplitude of 1A and a frequency of 250Hz (5 times the power frequency) is connected to node 12 of the distribution network, and two nodes with an amplitude of 0.25A and a frequency of 250Hz small-amplitude harmonic source to simulate the background harmonics in the distribution network. In order to simulate the influence of noise in actual engineering, in this embodiment, the measured voltage data is added Gaussian white noise. It should be noted that, in actual implementation, the pre...

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Abstract

The invention belongs to the technical field of harmonic source positioning in electric power systems, and specifically relates to a dominant harmonic source positioning and harmonic source pollution propagation path tracking method, specifically: forming a harmonic node impedance matrix according to distribution network parameters and load data, and performing column classification Yihua generates the atomic library; after detecting high-order harmonics, collect the measured voltage data of each node of the distribution network, calculate the harmonic voltage amplitude, form a harmonic voltage amplitude vector, and then search for the harmonic voltage amplitude vector from the atomic library. For the atom that best matches the value vector, calculate the weighting coefficient according to the least square method, and calculate the residual vector, continue the above search operation on the residual, and iterate until the error value is less than the threshold value, and the position of the dominant harmonic source can be indicated by the weighting coefficient On this basis, the normalized harmonic position indicator vector is multiplied by the harmonic node impedance matrix to obtain the pollution propagation path of the dominant harmonic source. The invention can further solve the harmonic pollution responsibility dispute and improve the management level of electric energy quality.

Description

technical field [0001] The invention belongs to the technical field of harmonic source positioning in electric power systems, and in particular relates to a dominant harmonic source positioning and a method for tracking the propagation path of harmonic source pollution. Background technique [0002] With the rapid development of technologies such as flexible direct current transmission and new energy power generation, in addition to traditional nonlinear loads such as electric arc furnaces and electrified railways, more and more power electronic rectifiers are connected to the distribution network, which leads to power system The problem of medium harmonic pollution is becoming more and more serious. In order to effectively control the harmonic pollution in the power system, ensure the economic operation of the distribution network and the safe electricity consumption of users, it is very important to accurately locate the harmonic source and trace the responsibility of harm...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R31/08
CPCG01R31/086
Inventor 郭敏金庆忍姚知洋楚红波刘路
Owner ELECTRIC POWER RES INST OF GUANGXI POWER GRID CO LTD
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