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Research on NPC Three-level Inverter and Neutral Point Potential Balancing

Author: LiXinRui
Tutor: MaWenZhong
School: China University of Petroleum
Course: Detection Technology and Automation
Keywords: Three-level Space Vector Pulse Width Modulation Midpoint potential DSP
CLC: TM464
Type: Master's thesis
Year: 2009
Downloads: 552
Quote: 10
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Abstract


With the development of power electronics technology , high -power multi- level inverter increasingly become a research hotspot. Because of its relatively low breakdown voltage requirements , the equivalent switching frequency is high , no dynamic voltage , the output waveform is good , etc., in the high frequency control , PWM reversible rectifier , power systems active filtering , and other aspects of the flexible transmission system a wide range of applications . Given diverse multi -level inverter topology and control strategy , the paper most widely diode clamped (NPC) three -level inverter as the research object , using space vector pulse width modulation (SVPWM) algorithm a theoretical and experimental research, but also for the three-level NPC inverter midpoint potential inherent imbalances were analyzed . Firstly, the paper analyzes the three-level NPC inverter working principle , SVPWM control strategy theory, midpoint potential harm imbalance , midpoint potential fluctuations cause fluctuations in the midpoint potential characteristics . Then, based on the principle of the analysis , from the DC bus capacitor charging and discharging the midpoint potential balance , this paper introduces two auxiliary circuits with a midpoint potential balance method ; software from a three -level SVPWM control algorithm to start using the plus or minus a small vector opposite effect on the midpoint potential , introduces a small sign by controlling the duration of action of the midpoint potential vector balancing algorithm . In theory , this article using MATLAB / SIMULINK simulation software on the midpoint potential equalization method for simulation, verified by simulation of several midpoint potential balancing algorithm correctness . Finally, under laboratory conditions , to build a three-level NPC inverter platform, using TI's DSP as the control core TMS320LF2407A type studied experimentally . Entire hardware system development including the main circuit , driver circuit isolation , detection circuit and a buffer circuit , but also SVPWM modulation algorithm using DSP software programming and other aspects . Through experimental waveforms and data analysis, project design based on the proven three-level inverter SVPWM control strategy correctly , using the midpoint potential balancing algorithm can effectively control the neutral point potential balance.

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CLC: > Industrial Technology > Electrotechnical > Transformers, converters and reactors > Converter > Inverter
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