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The Design and Implement of Power Quality Monitor Device Based on TMS320F28335

Author: LiangQiQuan
Tutor: HeJingHan
School: Beijing Jiaotong University
Course: Electrical Engineering
Keywords: Power Quality TMS320F28335 CAN Bus PLL ADS8364
CLC: TM933.4
Type: Master's thesis
Year: 2011
Downloads: 455
Quote: 3
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Abstract


More and more nonlinear loads and badly-impactive loads make the power quality problems of power system getting worse, while more and more users use microprocessor-based and computer-based automation equipment, these equipment is sensitively to power quality and strictly requirements of power quality, what’s more, China power gradually marketize, all these factor make the power quality problems as the focus of both power suppliers and users. Power quality monitoring technology is the quantitative measure and appraisal method of power quality, which is the technology needly researched.This paper analyses the causes of power quality problem, the significance of power quality monitoring and the development trend of power quality device;based on fullly study and research, we choose the DSP+ARM structure as hardware architecture of power quality monitoring device; and in-depth research each power quality monitoring national standards and the significance of measurement; this paper mainly completes signal disposal, analog-to-digital conversion, data processing and CAN communication module design and in-depth study each index of power quality algorithm and realize then in the device.This paper designs the data collection and processing circuit, which select sampling chip ADS8364 and signal processing chip TMS320F28335 as the core chip; research data precision sampling, DSP software development and implementation of algorithm. Among them, use regulate circuit converts the measured signals to the signal which AD transform circuit can accept, which include converter and compensate circuit, low-pass filter circuit and AD transform interface circuit; According to the need of sampling frequency measurement and control, designs the zero detection circuit and phase lock circuit, which realizes the system frequency tracking and the whole cycle sampling, and reduced the spectrum leakage in the harmonic calculation; Using DSP eCAP module cachs the rising edge of zero detection circuit output, realize frequency measurement; asynchronous sampling avoiding logic can repace the phase lock output by PWM as sample triggered signals in unstable condition, which ensure normal sampling in the extreme environment; designed the ADC peripheral circuit, and writed AD transform the bottom driver program, realize accurately sampling under the control of DSP; accomplished digital realization of each index algorithm and the software programming; Using DSP built-in CAN module implements CAN communication between DSP and ARM; integrate and optimize the programs of all modules, realize boot loader.The monitor system above has been debugged in hardware and tested in software. The system can realize anticipate function accrording to experimental results, and it can operate stablely.

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CLC: > Industrial Technology > Electrotechnical > Electrical measurement techniques and instruments > Power the number of measurements and instrumentation > Power measurement,power meter
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