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Research on the Harmonics Detecting Technique of Active Power Filter Based on DSP

Author: HuangDanDan
Tutor: XiZiQiang
School: Hubei University of Technology
Course: Power Electronics and Power Drives
Keywords: Power Quality Harmonic Active Power Filter Simulation
CLC: TM935.2
Type: Master's thesis
Year: 2010
Downloads: 146
Quote: 0
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Abstract


With the widespread use of a variety of power electronic devices and non-linear loads, the large number of harmonics are injected into the grid, so that the waveform distortion of the voltage and current in the grid, and seriously affect the quality of the grid power. In addition, due to the low power factor of most of the non-linear power electronic devices, will also affect the quality of power supply. Therefore, in order to ensure a high level of power quality, harmonics problem has become a major issue faced by the field of power system studies, are more and more attention and concern. So far, the active power filter is one of the most effective means of harmonic suppression. Active power filter consists of two parts: the command current computing circuit and compensation current generating circuit. In this thesis focuses on the part of the command current computing circuit, do in-depth analysis of how to accurately detect the harmonic components. Start from the harmonic problems the first harmonic concept, produce and hazards described, and describes two methods of harmonic suppression: Another way to start from the harmonic source, reduce the generation of harmonics; plus filtering device is passive filters and active power filter two. Secondly, the research status of active power filter. Finally, on the subject of this paper sources, research content and research goals. Passive filters and active filters detail, including how they work, classification, advantages and disadvantages. On the basis of the analysis of the traditional harmonic detection method, a new harmonic detection scheme - dedicated energy metering the chip ATT7022C detection harmonics. The chip features a comprehensive exposition dedicated energy metering chip detection harmonic works, and compared with the traditional harmonic detection method. Next elaborated DSP-based active power filter system design, the hardware circuit schematic of the testing program are presented in detail, including the design of the main circuit, the auxiliary power supply circuit design as well as the harmonic voltage and current sampling circuit design. It also describes a system software design methods given in detail the various parts of the flowchart. In order to verify the correctness and reliability of the program, in addition to its argument practice, their use of the MATLAB simulation software simulation studies. The experimental and simulation results show the effectiveness of using a dedicated energy metering chip ATT7022C detection harmonic shorten the development cycle, improve the detection accuracy. Finally, a summary of the full text, and pointed out that further research direction and content.

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CLC: > Industrial Technology > Electrotechnical > Electrical measurement techniques and instruments > Frequency, waveform parameter measurement and instrumentation > Waveform parameter measurement and instrumentation
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