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Power system harmonic detection device and method

A harmonic detection and power system technology, applied in the direction of measuring devices, measuring electrical variables, instruments, etc., can solve the problems of low detection accuracy, high cost, poor detection effect of harmonic detection devices, etc., to improve real-time performance and accuracy The effects of sub-harmonic content rate and accurate total harmonic distortion rate

Inactive Publication Date: 2016-05-04
HARBIN UNIV OF SCI & TECH
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Problems solved by technology

[0006] The purpose of the present invention is to solve the problems of poor detection effect, low detection accuracy and high cost of a power system harmonic detection device in the prior art

Method used

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  • Power system harmonic detection device and method
  • Power system harmonic detection device and method

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Embodiment Construction

[0027] The specific embodiment of the present invention is illustrated in conjunction with the accompanying drawings. A power system harmonic detection device of the present invention includes a voltage transformer, a current transformer, a signal conditioning circuit, a digital-to-analog conversion module, a DSP controller, an ARM processor and a communication The input terminals of the voltage transformer and current transformer are connected to the power grid, the output terminals of the voltage transformer and current transformer are connected to the input terminal of the signal conditioning circuit, and the output terminal of the signal conditioning circuit is connected to the DSP controller through the digital-to-analog conversion module. The output of the DSP controller is connected to the ARM processor through the communication module, such as figure 1 shown.

[0028] The ARM part of this embodiment takes the LPC2132 processor of ARM7TDMI-S core as the core, which adop...

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Abstract

The invention relates to a power system harmonic detection device and method. The objective of the invention lies in solving problems that a power system harmonic detection device in the prior art is poor in detection effect, is low in detection precision, and is high in cost. The input end of a voltage transformer and the input end of a current transformer are connected with a power grid. The output ends of the voltage transformer and the current transformer are respectively connected with the input end of a signal conditioning circuit. The output end of the signal conditioning circuit is connected with a DSP controller through a digital-analog conversion module, and the output end of the DSP controller is connected with an ARM processor through a communication module. The device not only obtains an accurate total harmonic distortion rate, but also obtains precise percentages of harmonics at all orders.

Description

technical field [0001] The invention relates to a harmonic detection device and a harmonic detection method, in particular to a power system harmonic detection device and a harmonic detection method, belonging to the technical field of power system harmonic analysis. Background technique [0002] With the continuous progress of the society and the rapid development of the economy, the production and living standards of human beings have been greatly improved. Various types of motors, rectifiers, electric arc furnaces and AC / DC converters in the power system and other non-linear loads and shocks Increasing sexual load. These non-linear loads are randomly combined and operated in the power grid, resulting in severe distortion of current and voltage waveforms. In the distorted current and voltage waveforms, there are not only sinusoidal components with the same frequency as the power supply, called the fundamental component, but also a series of sinusoidal components whose fre...

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Application Information

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IPC IPC(8): G01R23/165
CPCG01R23/165
Inventor 房国志李发亮李晴晴马建明
Owner HARBIN UNIV OF SCI & TECH
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