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Method and device for acquiring harmonic characteristics of power grid containing new energy stations

A new energy and station technology, applied in circuit devices, electrical components, AC network circuits, etc., can solve problems such as tripping of new energy units, power grid harmonic amplification, affecting local power grid operation, etc.

Inactive Publication Date: 2019-08-16
CHINA ELECTRIC POWER RES INST +3
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Under the action of the new energy unit controller, these harmonic components will generate harmonic currents at the grid-connected point of the system, and interact with the grid impedance, which may cause harmonic amplification of the grid, cause tripping of new energy units, and even affect the operation of local power grids

Method used

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  • Method and device for acquiring harmonic characteristics of power grid containing new energy stations
  • Method and device for acquiring harmonic characteristics of power grid containing new energy stations
  • Method and device for acquiring harmonic characteristics of power grid containing new energy stations

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Embodiment Construction

[0034] In the following description, numerous specific details are set forth in order to provide a thorough understanding of the application. However, the present application can be implemented in many other ways different from those described here, and those skilled in the art can make similar promotions without violating the connotation of the present application. Therefore, the present application is not limited by the specific implementation disclosed below.

[0035] Please see figure 1 , figure 1 It is a schematic flowchart of a method for obtaining harmonic characteristics of a power grid including new energy stations provided by the embodiment of the present application. The following is combined with figure 1 , to describe the method provided in this application in detail.

[0036] Step S101, establishing a node admittance matrix of the linear network part.

[0037] For a power grid consisting only of conventional turbogenerators, transmission lines, transformers, l...

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Abstract

The invention discloses a method for acquiring the harmonic characteristics of a power grid containing new energy stations, which is characterized by comprising the following steps: establishing a node admittance matrix of a linear network part; acquiring frequency response data of equivalent admittance of new energy stations by simulation or field test, and using the frequency response data to form supplementary admittance matrixes of the new energy stations at different frequencies; including the supplementary admittance matrix of each new energy station in the node admittance matrix of thelinear network part to form a node admittance matrix of the whole power grid; and acquiring the harmonic distribution of the whole power grid under harmonic disturbance according to the node admittance matrix of the whole power grid, and evaluating the harmonic distortion and overvoltage risk of the power grid. The need for harmonic characteristic analysis is satisfied.

Description

technical field [0001] The application relates to the field of analysis of grid harmonics, in particular to a method for obtaining harmonic characteristics of a power grid including new energy stations, and to a device for obtaining harmonic characteristics of a power grid including new energy stations. Background technique [0002] With the rapid development of new energy and power electronics industry, the constraints of non-off-grid operation of new energy units under the condition of unbalanced grid voltage and harmonic distortion of grid voltage have gradually attracted attention. Due to the large number of applications of power electronic converters, there will always be certain power harmonics in the power grid, such as background harmonics in the power grid and operations, nonlinear equipment operations or transient harmonics during faults, etc., which will make the power grid voltage There are three-phase unbalance and low-order harmonic distortion. Under the actio...

Claims

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Application Information

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IPC IPC(8): H02J3/00
CPCH02J3/00H02J2203/20
Inventor 周佩朋项祖涛丁理杰宋瑞华杨越魏巍韩亚楠杜宁
Owner CHINA ELECTRIC POWER RES INST
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