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DSP-based portable low pressure fault recorder study

Author: HuangShengChao
Tutor: ChengQiong
School: Hubei University of Technology
Course: Power Electronics and Power Drives
Keywords: Disturbance Fast Fourier Transform Harmonic Analysis Human-Computer Interaction
CLC: TM76
Type: Master's thesis
Year: 2009
Downloads: 63
Quote: 0
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Abstract


Today's high- voltage power systems are installed with microprocessor-based fault recorder , it is mainly to monitor the operation of high-pressure systems , low pressure system does not detect a variety of operating indicators , and portable low pressure fault recorder is designed for low pressure systems low-voltage network fault detection devices. Portable low voltage fault recorder can provide a variety of information users provide on-site , and to help the user to check and record the various failures. In this paper, TI's low- power DSP system for data processing , capable of precise data analysis . Papers on the fault recorder used in various algorithms have been studied , the main analysis fast Fourier algorithm ; while completing a portable low-voltage fault recorder data acquisition and interactive part of the main design , and interactive interface simulation. Software algorithms , the paper discusses the fault recorder grid for the start of each criterion and the calculation sequence component , and the use of Fast Fourier Transform algorithm to the sampled voltage and current signals for harmonic analysis ; and each of the power line kind of fault location algorithm to achieve the power line fault points accurately . In the system design , the use of high-speed , high-precision A / D converter AD7676 to achieve multi-channel analog signal acquisition , the maximum sampling rate of up to 200k / s. The system for collecting data through the DSP to calculate and analyze the power system fault diagnosis, the main flow of harmonic analysis program ; human-computer interaction interfaces using CPLD for DSP extensions , and use the CPLD logic function to complete LCD control . Finally, VC as the working platform for the preparation of the LCD and simulation program . Experiments show that this design can meet the human-computer interface design requirements.

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CLC: > Industrial Technology > Electrotechnical > Transmission and distribution engineering, power network and power system > Power system automation
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