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A harmonic resonance analysis method based on singular value sensitivity

An analysis method and sensitivity technology, which is applied in the field of power system analysis and control, can solve the problems of heavy computational analysis workload and complex modeling, and achieve the effect of improving accuracy and efficiency

Inactive Publication Date: 2019-04-16
ELECTRIC POWER RES INST OF GUANGXI POWER GRID CO LTD
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Problems solved by technology

[0004] The purpose of the present invention is to provide a harmonic resonance analysis method based on singular value sensitivity, thereby overcoming the disadvantages of complex modeling and large workload of calculation and analysis if the traditional point-to-point frequency scanning method is used to study the overall resonance law of the power grid

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  • A harmonic resonance analysis method based on singular value sensitivity
  • A harmonic resonance analysis method based on singular value sensitivity
  • A harmonic resonance analysis method based on singular value sensitivity

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[0036] The technical solutions in the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the protection scope of the present invention.

[0037] like Figure 5 As shown, the harmonic resonance analysis method based on singular value sensitivity provided by the present invention includes the following steps:

[0038] S1. According to the structural characteristics of the power grid, obtain the transfer function matrix between the harmonic observation amount (node ​​voltage or branch current) and the harmonic excitation source, and the matrix elements take the frequency f as a variable, and the specific...

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Abstract

The invention discloses a harmonic resonance analysis method based on singular value sensitivity, which relates to the technical field of power system analysis and control, and comprises the followingsteps: S1, obtaining a transfer function matrix between a harmonic observed quantity and a harmonic excitation source according to the structural characteristics of a power grid; S2, performing singular value decomposition on the transfer function matrix obtained in the step S1 within a certain frequency range, and analyzing a harmonic resonance rule of the power grid according to a singular value decomposition result; And S3, selecting analyzed system parameters according to analysis requirements, calculating singular value sensitivity according to the maximum singular value of the resonantfrequency obtained in the step S2 and the left and right singular phasors of the resonant frequency, and screening out parameters with great influence on the resonant intensity of the power grid according to the singular value sensitivity. According to the method, the transfer function matrix between the harmonic observation quantity and the harmonic excitation source is utilized, singular value decomposition is carried out, the harmonic resonance rule of the power grid can be systematically researched from the power grid level, and the harmonic resonance analysis efficiency is improved.

Description

technical field [0001] The invention relates to the technical field of power system analysis and control, in particular to a harmonic resonance analysis method based on singular value sensitivity. Background technique [0002] In the distributed power microgrid, the electric energy generated by new energy sources such as wind energy and solar energy is transmitted to the grid and users through the converter. However, as a large number of converters containing LCL filters are connected to the power grid, the interaction between the control loop of the converter and the inductive and capacitive elements in the power grid can easily cause harmonic resonance in the power grid, and the resulting voltage and current harmonics seriously endanger the power grid. And the grid-connected converter runs safely and stably. [0003] The existing harmonic resonance analysis methods mainly fall into two categories: frequency sweep method and modal analysis method. The frequency sweep meth...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F17/50G06Q50/06
CPCG06Q50/06G06F30/20
Inventor 周柯丘晓茵金庆忍丘浩楚红波郭敏陈卫东姚知洋
Owner ELECTRIC POWER RES INST OF GUANGXI POWER GRID CO LTD
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