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Investigation on SVPWM Arithmetic for Three-level Inverter

Author: LiangYing
Tutor: ZhuangShengXian
School: Southwest Jiaotong University
Course: Proceedings of the
Keywords: three-level inverter space voltage vector neutral-point-banlance narrow pulse width MATLAB simulation
CLC: TM464
Type: Master's thesis
Year: 2009
Downloads: 512
Quote: 4
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Abstract


Since the begin of the 21st century, the research and exploiture of three-level inverter has been obtained a far-ranging attention in power electronics and flexible AC transmission system fields.This thesis summarizes the actuality of three-level inverter’s research and exploiture included the topology structure , the pulse width modulation technology , the balance strategy of neutral-point voltage and the elimination of narrow pulse width through reading lots of reference papers. The thesis is organzd as follows:Chapter 2 systematicly analyses the inherent property and basic working principle of three-level inverter based on diode-clamp theree-level inverter topology structure. It presents two kinds of control algorithms to fulfill this system,detailly compares d-q reference frame arithmetic with g-h reference frame arithmetic of space vector pulse width modulation arithmetics. The optimized g-h reference frame SVPWM arithmetic is stressly analyzed ,which avoids a mass of operations and optimizes the role order of switch vectors. We can calculate the duration time of the basic vector , just through some simple arithmetic operations.Chapter 3 studies the causation of capacitance voltage’s imbalance belongs to direct current sides of diode-clamp three-level inverter.Then,it discusses relevant neutral-point-balance control strategy according to the two different corresponding algorithms.At the same time,it presents the concrete implement process with full and accurate data and diagrams.Chapter 4 introduces the definition of narrow pulse width and how to distinguish the narrow pulse width.It studies the causation of the narrow pulse width and presents the concrete implement process to eliminate the narrow pulse width.Chapter 5 simulates the two kinds of algorithm and corresponding neutral-point-balance and elimination of NPW control strategy with MATLAB. It compares the main difference between the analysed two kinds of algorithms. the detailed simulation results shows that the g-h reference frame SVPWM arithmetic is feasible and superior to attain perfect sine wave and to control neutral-point-balance ,besides the narrow pulse width is also primely eliminated.

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