A method and device for evaluating the influence of power grid harmonics

A technology that affects harmonics and power grids, applied in the field of power systems, can solve problems such as large amount of calculations and low timeliness, and achieve the effect of solving large amounts of calculations

CN106651150BActive Publication Date: 2021-02-09GLOBAL ENERGY INTERCONNECTION RES INST CO LTD +2
5 Cites 0 Cited by

Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Publication Date
2021-02-09

Smart Images

  • Figure 1
    Figure 1
  • Figure 2
    Figure 2
  • Figure 3
    Figure 3
Patent Text Reader

Abstract

A method and device for evaluating the influence of grid harmonics, wherein the method for evaluating the influence of grid harmonics includes: obtaining at least one random harmonic sample of a harmonic source in the grid; calculating the power grid based on the random harmonic sample Harmonic power flow data; determine the probability density function of the harmonic power flow data; determine the influence of the harmonic source on the power grid according to the probability density function, and solve the problem that the existing harmonic probability evaluation method has a large amount of computation, The problem of low timeliness.
Need to check novelty before this filing date? Find Prior Art

Description

technical field

[0001] The invention relates to the field of power systems, in particular to a method and device for evaluating the influence of harmonics on a power grid. Background technique

[0002] With the development of the economy, the scale of the power grid is increasing day by day, and the structure of the power grid is becoming more and more complex, so that the power quality problem has attracted much attention, and harmonic pollution has also become a key issue. Non-linear loads such as power electronic devices, electric arc steelmaking furnaces, and a large number of distributed power sources make the harmonic pollution of the power grid more and more serious. Harmonics can damage electrical equipment and power electronic devices, reduce power utilization efficiency, and even cause malfunctions of electrical equipment. Therefore, an accurate assessment of the harmonic impact is of great significance. On the basis of accurate assessment, it can provide basis f...

Examples

Embodiment Construction

[0053] The technical solutions of the present invention will be clearly and completely described below in conjunction with the accompanying drawings. Apparently, the described embodiments are some of the embodiments of the present invention, but not all of them. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

[0054] A harmonic probability evaluation method provided by an embodiment of the present invention, such as figure 1 shown, including:

[0055] S11. Acquire at least one random harmonic sample of a harmonic source in the power grid. Harmonic sources in the power grid can include load-type harmonic sources or distributed power supply-type harmonic sources. For load-type harmonic sources, the amount of harmonic injection generated by them is represented by the current source. For each harmonic current Amplitud...