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A Designated Subharmonic Detection Method Based on Cascade Delayed Signal Elimination Method

A delay signal and detection method technology, applied in the field of micro-grid specified sub-harmonic compensation, power system, can solve problems such as increasing the amount of calculation and affecting the dynamic performance of the system

Active Publication Date: 2017-12-19
STATE GRID GANSU ELECTRIC POWER CORP +2
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Problems solved by technology

The traditional positive sequence component and negative sequence component also need to use the symmetrical component method to separate the extracted harmonic signals again, which not only increases the amount of calculation, but also affects the dynamic performance of the system. Therefore, to achieve the specified harmonic The key to wave compensation is to extract the main sub-harmonic components in the distorted signal accurately and quickly

Method used

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  • A Designated Subharmonic Detection Method Based on Cascade Delayed Signal Elimination Method
  • A Designated Subharmonic Detection Method Based on Cascade Delayed Signal Elimination Method
  • A Designated Subharmonic Detection Method Based on Cascade Delayed Signal Elimination Method

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Embodiment Construction

[0074] In order to more effectively illustrate the correctness and applicability of the arbitrary harmonic extraction method based on the cascaded delay signal elimination method disclosed in the present invention, this embodiment builds a micro-distribution network composed of two distributed generation units connected in parallel ,Such as figure 2 As shown, it mainly includes two parts: the main circuit and the harmonic extraction module:

[0075] The main circuit includes a small distribution network composed of two AC distributed power sources DG and loads. The parameters of the main circuit are shown in Table 1. In order to better verify the feasibility and superiority of the harmonic extraction method disclosed in the present invention, the distributed power sources DG1 and DG2 are replaced by two ideal three-phase voltage sources.

[0076] Table 1 Main circuit parameters

[0077]

[0078] A method for detecting specified sub-harmonics based on cascade delay signal...

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Abstract

The invention discloses a subharmonic detection method based on cascade delay signal elimination method, comprising steps of obtaining a,b,c three-phase voltage signals of a power grid load terminal through a voltage sensor and a digital regulation circuit, utilizing a Clark transform to obtain a voltage signal under two-phase static coordinate system vabc=[va,vb,vc]<T>, (2) performing filtering process based on the delay signal elimination on the V alpha Beta which is obtained through transformation to obtain voltage signals which only contains odd- number harmonic component and voltage signal which only contains the even-number harmonic component, (3) performing filtering processing based on the cascade delay signal elimination on the voltage signals which only contain the odd-number harmonic wave component and the voltage signals which only contain the even-number harmonic component to obtain the components of positive sequence and negative sequence of any subharnonic, and (4) performing superposition on the harmonic components to obtain a total harmonic signal. The invention is high in detection accuracy and high a practicability.

Description

technical field [0001] The invention relates to the field of specified harmonic compensation for power systems and microgrids, in particular to a specified harmonic detection method based on cascade delay signal elimination method. Background technique [0002] With the proportion of unbalanced, nonlinear equipment and loads in the power system gradually increasing, the power quality problems of the system are becoming more and more prominent, especially the harmonic problems. In order to effectively achieve harmonic control, some harmonic compensation methods and equipment have emerged, such as active power filters, unified power quality regulators, multifunctional inverters with the ability to adjust power quality and their control strategies, etc. [0003] The relatively mature harmonic detection method based on instantaneous reactive power theory has the advantage of eliminating the influence of voltage distortion and asymmetrical voltage, but this harmonic detection met...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R23/16
Inventor 李顺福任灵吴丽珍周虎陈建鹏孙巍巍张国荣张宏伟雷洋洋杨旭生鲜龙刘智伟宋业群
Owner STATE GRID GANSU ELECTRIC POWER CORP
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