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Voltage fluctuation and flicker tester based on FPGA and ARM9

A technology of voltage fluctuation and tester, which is applied in the field of power quality monitoring device and voltage fluctuation and flicker tester based on FPGA and ARM9. Control, development convenience, high precision effect

Pending Publication Date: 2022-04-22
JIANGSU ANFANG ELECTRIC POWER TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The measurement of voltage flicker by the square detection method based on virtual instruments requires the cooperation of a computer, which is not convenient for handheld or installed applications

Method used

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  • Voltage fluctuation and flicker tester based on FPGA and ARM9
  • Voltage fluctuation and flicker tester based on FPGA and ARM9
  • Voltage fluctuation and flicker tester based on FPGA and ARM9

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Embodiment Construction

[0019] The technical solution of the present invention will be further described in detail below in conjunction with the accompanying drawings.

[0020] A handheld device consisting of a signal preprocessing circuit, synchronous A / D converter, FPGA and ARM microcontroller system. The 4 AC voltage signals are detected and processed by the signal preprocessing circuit, and then the pre-operation is performed by the FPGA and the AD conversion circuit is converted and processed, and then transmitted to the ARM control system for the post-operation to realize human-computer interaction and network communication functions.

[0021] The signal preprocessing circuit is composed of a voltage transformer, an adjustable amplifier circuit composed of an analog switch and an operational amplifier, and an RC low-pass filter, which can convert the measured voltage signal into a signal suitable for the A / D range (the system design is -5 ~﹢5V), and filter out high-frequency components. Among ...

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Abstract

According to the invention, an embedded ARM9 controller and an FPGA are used as processing cores, and a handheld voltage fluctuation and flicker tester is designed, so that the short-time flicker value Pst and the long-time flicker value Plt of multiple paths of AC voltage signals can be measured at the same time. In order to simplify the operation process, primary root-mean-square value operation is carried out on each half cycle of the voltage, fast Fourier transform is carried out on an obtained root-mean-square value sequence, an instantaneous flicker value corresponding to each frequency is solved, and short-time flicker is solved by utilizing a probability maximum value method. Two groups of memories in the FPGA alternately receive data, and a 32-bit FFT algorithm is realized by using a ping-pong mode, so that the operation speed and precision can be greatly improved. The actual measurement result shows that the calculation precision of the tester for the root-mean-square value reaches 2%, and the flicker measurement precision reaches 2%. The software and hardware platform can conveniently expand the electric energy quality measurement application of harmonic waves, inter-harmonic waves and the like, and has better popularization value.

Description

technical field [0001] The invention belongs to the technical field of electronic measurement, relates to a power quality monitoring device, in particular to a voltage fluctuation and flicker tester based on FPGA and ARM9. Background technique [0002] With the rapid development of my country's industry and national economy, the load of the power grid has increased sharply, especially the proportion of impact and nonlinear loads has continued to increase, causing fluctuations and flickering of the power supply voltage, which seriously affect the power quality of the power grid. At present, the digital flicker meter based on the flicker measurement principle given by the IEC61000-3-7 standard has come out, but its measurement method is complicated and the cost is high. The voltage flicker detection method based on parallel filters needs to use two parallel filters to analyze the spectrum and follow the amplitude, which is difficult to implement. The measurement of voltage fl...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R19/25
CPCG01R19/25
Inventor 许杏桃沈海奉徐小康许杏明王益明沈正彬严程伟刘欣宇
Owner JIANGSU ANFANG ELECTRIC POWER TECH
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