A power harmonic analyzer based on fpga

A power harmonic and analyzer technology, applied in the field of power electronics, can solve problems such as difficulty in obtaining amplitude-frequency and phase-frequency characteristics, inaccurate sampling, poor real-time performance, etc., to solve the bottleneck of data transmission, stable system operation, and processing speed fast effect

Inactive Publication Date: 2011-12-21
NORTHEASTERN UNIV
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Problems solved by technology

But this detection method has its own shortcomings: large error, poor real-time performance, especially when the grid frequency changes, it is very sensitive to the parameters of circuit components, the detection effect is obviously worse when the parameters change, and it is difficult to obtain ideal amplitude-fre

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  • A power harmonic analyzer based on fpga
  • A power harmonic analyzer based on fpga
  • A power harmonic analyzer based on fpga

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Embodiment Construction

[0068] The content of the present invention will be further described below in conjunction with the accompanying drawings.

[0069] The embodiment of the present invention is realized on the FPGA development board DE2-70 of Altera Company. The development board reserves two expansion interfaces. In this system, these two expansion interfaces are used to connect the acquisition circuit of the display module LTM and AD7606 respectively. The FPGA chip on the DE2-70 development board is the Cyclone II series EP2C70F896C6N of Altera Company. The overall structure of the system is shown in the figure 1 shown. The overall flow chart of the system is as follows figure 2 shown. The structural block diagram of the Nios II soft-core processor module in this system is as follows image 3 shown.

[0070] The sensor circuit in the FPGA-based power harmonic analyzer of the present invention mainly includes voltage and current signal acquisition parts. In the voltage signal acquisiti...

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Abstract

The invention relates to an FPGA (field programmable gate array)-based power harmonic analyzer, belonging to the technical field of power electronics. The power harmonic analyzer comprises a sensor circuit and an AD sampling circuit as well as a data acquisition module, a data caching module, a data type conversion module, a windowing module, an FFT (fast Fourier transformation) computation module, an operational result storing and interruption generating module, a Nios II soft core processor module and an LTM (long-term memory) display module which are arranged in an FPGA. In the invention, harmonic acquisition and processing at the front end are realized by adopting hardware, thus the acceleration advantage of hardware is fully played; and the processed data is further calculated and controlled by utilizing the Nios II soft core processor in the FPGA, the process is completed on an on chip bus of the FPGA, data transmission is realized, and speediness of hardware design and control flexibility of the Nios II soft core processor are given full play.

Description

technical field [0001] The invention belongs to the technical field of power electronics, in particular to an FPGA-based power harmonic analyzer. Background technique [0002] Harmonic analysis of power system is of great significance in power quality analysis and power system control. Fast and accurate detection of harmonics is the basis of harmonic suppression and reactive power compensation. [0003] At present, there are many methods for harmonic detection of power systems at home and abroad. The methods for harmonic detection and harmonic analysis of power systems at home and abroad mainly include the following: [0004] (1) Analog filter method [0005] The early harmonic detection methods were all based on the frequency domain theory, that is, the analog filtering principle was used. There are two types of analog filters, one is to filter out the fundamental current component through the filter to obtain the harmonic current component; the other is to obtain the fun...

Claims

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Application Information

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IPC IPC(8): G01R23/16G01R19/25
Inventor 李晶皎薛长江陆振林
Owner NORTHEASTERN UNIV
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