Method for detecting fundamental component and harmonic component of voltage of power grid

A technology of grid voltage and fundamental wave components, applied in the field of signal processing, can solve problems such as low detection accuracy

Inactive Publication Date: 2012-04-04
HARBIN INST OF TECH
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Problems solved by technology

[0004] The present invention aims to solve the problem of low detection accuracy of the existing voltage fundamental wave and harmonic co

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  • Method for detecting fundamental component and harmonic component of voltage of power grid
  • Method for detecting fundamental component and harmonic component of voltage of power grid
  • Method for detecting fundamental component and harmonic component of voltage of power grid

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specific Embodiment approach 1

[0054] The specific embodiment one, a kind of detection method of grid voltage fundamental wave component and harmonic component, it is realized by the following steps:

[0055] Step 1. Construct a notch filter according to the LMS algorithm, collect the voltage signals of each phase of the grid voltage, and use the notch filter to separate the acquired voltage signals of each phase to obtain the fundamental component and harmonics of each phase voltage weight;

[0056] Step 2, using the error signal in the fundamental wave component of the A-phase voltage obtained in step 1 as the feedback of the phase-locked loop, and using the phase-locked loop to obtain the estimated value of the grid voltage frequency and the estimated value of the phase, the grid voltage frequency The estimated value of and the estimated value of the phase are used to generate the reference input vector required by the LMS algorithm for constructing the notch filter;

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Abstract

The invention discloses a method for detecting a fundamental component and a harmonic component in voltage of a power grid, which relates to the field of signal processing and solves the problem that the traditional method for detecting the fundamental component and the harmonic component in the voltage has low accuracy. The method comprises the following steps of: designing a wave trap according to an LMS (Least Mean Square) algorithm; separating out the fundamental component and the sub-harmonic components from voltage of power grid by using the wave trap to obtain the fundamental component and the sub-harmonic components in the phase voltage; taking an error signal in the obtained fundamental component in the phase A voltage as a feedrear of a phase locked loop, and using the phase locked loop to obtain an estimation value of a power grid voltage frequency and an estimation value of the phase; and according to the obtained fundamental component and the sub-harmonic components in the phase voltage, using a symmetrical component method to detect positive sequence, negative sequence and zero sequence information of the fundamental component and the sub-harmonic components, taking the information as the detection results, and finishing the detection of the fundamental component and the harmonic component in the voltage of the power grid. The method is suitable for the detection of the fundamental component and the harmonic component in the voltage of the power grid.

Description

technical field [0001] The invention relates to the field of signal processing, in particular to a method for detecting voltage fundamental waves and harmonic components. Background technique [0002] The amplitude, phase angle and frequency of the grid voltage fundamental wave and each harmonic positive sequence, negative sequence, and zero sequence components are important factors for renewable energy grid-connected power generation converters, uninterruptible power supplies, active filters, dynamic voltage restorers, Necessary information for the normal operation of the power system FACTS. Therefore, it is of great practical value to study the separation algorithm of fundamental and harmonic components of grid voltage. [0003] Zhao Guoliang, Liu Baozhi, Xiao Xiangning, etc. proposed a time-delay-free improvement in the article "A No-delay Improved d-q Transformation in Dynamic Voltage Disturbance Identification" (Power Grid Technology, 2004, 28(7): 53-57) The dq transf...

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Application Information

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IPC IPC(8): G01R23/16
Inventor 徐殿国张学广刘义成景卉
Owner HARBIN INST OF TECH
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