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Research on PWM Technique and Evaluation Method of NPC Three-Level Inverter

Author: WuWenZuo
Tutor: ZhongYanRuï¼›WangJianYuan
School: Xi'an University of Technology
Course: Power Electronics and Power Drives
Keywords: The three-level inverter Space voltage vector Harmonic content Motor harmonic losses
CLC: TM464
Type: Master's thesis
Year: 2009
Downloads: 99
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Abstract


Within the hexagonal depth study of the diode clamped three - level inverter PWM generation technique in detail the traditional seven-segment symmetric SVPWM algorithm based on an improved SVPWM algorithm , the algorithm in space Vector bipolar modulation shaped peripheral triangle using semi - bipolar the modulation or unipolar modulation . At the same time , the analysis of the three - level inverter DC side of the midpoint voltage imbalance reasons , the exact midpoint voltage of the DC side control algorithm uses a self-balancing , and detailed derivation of the various regions of the control parameters formula . Of the the inverter PWM technology existing evaluation method to conduct in-depth research and analysis of the defects of the existing evaluation methods . Own preparation based on the Fourier series expansion numerical methods to analyze the output voltage harmonic characteristics of the three - level inverter SVPWM in MATLAB , and from the harmonic content the angle ( THD ) , voltage harmonics caused by harmonic wave current angle (WTHD), harmonic currents caused by motor harmonic losses angle (LWTHD) of quantitative comparative study of the traditional seven-segment symmetrical SVPWM and improved SVPWM ; midpoint voltage offset caused by harmonics analysis, research midpoint voltage offset caused by motor harmonic loss curve , and summed up the impact of the laws of the curve . The evaluation method has a parameter scalability , versatility and precision . TMS320LF2407A DSP as the core control on the three - level prototype for 0.75kW induction motor , respectively, using the traditional seven-segment symmetrical SVPWM and improved SVPWM algorithm control system experiment . DPO4054 oscilloscope experimental platform and PC connecting bridge in the experiment , and the experiment in the acquisition of data transmission to a PC using the collected data on a PC using a numerical method based on the Fourier series expansion of the experimental output line voltage waveform analysis by the the THD, WTHD and LWTHD indicators quantitative comparative study of two modulation methods . The experimental program designed to further verify the correctness and feasibility of the use of numerical methods based on the Fourier series expansion evaluation PWM technology .

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