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A method for comprehensive control of regional power grid harmonics considering the characteristics of harmonic coupling

A comprehensive treatment and regional technology, applied in AC network to reduce harmonics/ripples, harmonic reduction devices, circuit devices, etc., can solve problems such as power quality deterioration, power grid power quality optimization, uneconomical, etc. The effect remains stable

Active Publication Date: 2021-01-19
XI AN JIAOTONG UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

On the one hand, it is not economical. On the other hand, if for some reason only some problem loads are treated, the overall power quality of the grid cannot be guaranteed to be optimized. worsened

Method used

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  • A method for comprehensive control of regional power grid harmonics considering the characteristics of harmonic coupling
  • A method for comprehensive control of regional power grid harmonics considering the characteristics of harmonic coupling
  • A method for comprehensive control of regional power grid harmonics considering the characteristics of harmonic coupling

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Embodiment 1

[0103] see Figure 4 The harmonic comprehensive control system shown in the present invention can obtain the relationship between the voltage of the point to be controlled and the output current of the active power filter of the control equipment through online measurement of the grid impedance, that is, the transfer impedance parameter in the impedance model of the grid, according to The model calculates the command output current of SAPF that makes the power quality of the grid optimized as a whole.

[0104] Taking the 5th and 7th harmonic coupling situations as examples below, a method for comprehensive harmonic control of a regional power grid considering the harmonic coupling characteristics of the present invention will be described. The specific steps are as follows:

[0105] Step 1: Install real-time monitoring devices on the required governance points to obtain voltage information of each node.

[0106] Step 2: Set the output of the active power filter to 0, after th...

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Abstract

The invention provides a regional power grid harmonic comprehensive treatment method taking harmonic coupling characteristics into consideration. According to the method, a rectifier is used as an example for analysis, and the harmonic coupling characteristic of the rectifier is inspected through a harmonic coupling admittance matrix model; a nonlinear load model considering the harmonic couplingcharacteristic is obtained, and then a simplified power grid harmonic analysis impedance model mainly considering five-order and seven-order harmonic coupling is established. After the impedance modelis determined, a corresponding command current can be obtained through selection of a proper objective function, and then an online optimization link is introduced, so that a model mismatching phenomenon caused by the change of the power grid parameters due to load switching and the like can be solved, so as to obtain an accurate command output current, thereby obtaining a better treatment effect.

Description

technical field [0001] The invention belongs to the field of power quality optimization of power grids, and particularly relates to a method for comprehensively controlling harmonics in a regional power grid considering the characteristics of harmonic coupling. The control method for wave governance. Background technique [0002] With the development of power electronics technology in recent years, more and more power electronic devices such as rectifiers, inverters and DC-DC converters have been widely used in the power grid because of their ability to convert electric energy efficiently and conveniently. However, due to the nonlinear characteristics of power electronic devices, the investment of power electronic equipment inevitably produces a large number of harmonic and reactive power problems that cannot be ignored in the grid, deteriorating the power quality of the grid. [0003] In order to solve such problems, a variety of power quality control equipment has emerged...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J3/01
CPCH02J3/01H02J2203/20Y02E40/40
Inventor 易皓卓放翟灏陶冉杨泽斌朱承治
Owner XI AN JIAOTONG UNIV
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