In order to output sine wave with small degree of distortion and improve stability,a type of inverter power supply is designed based on harmonic elimination pulse-width modulation(PWM)control.The rectifier and filter ...In order to output sine wave with small degree of distortion and improve stability,a type of inverter power supply is designed based on harmonic elimination pulse-width modulation(PWM)control.The rectifier and filter are added to input circuit of the inverter.Single-phrase full-bridge inverter performs the function of converting direct current into alternating current(DC/AC).In the control circuit,single chip micyoco(SCM)AT89C2051 is used for main control chip to accomplish the hardware design of the control system.A given value of output frequency of the inverter is input in the way of coding.According to the output frequency code which is read,SCM AT89C2051 defined harmonic elimination PWM control data which will be selected.Through internal timing control,the switches are switched under this provision of PWM control data.Then the driving signals of the switches in the inverter are output from I/O of SCM AT89C2051 to realize harmonic elimination PWM control.The results show that adding Newton homotopic algorithm of harmonic elimination PWM control to corresponding software of the control system can make the quality of output voltage of the inverter higher and it will have broad application prospects.展开更多
This paper presents a unique voltage-raising topology for a single-phase seven-level inverter with triple output voltage gain using single input source and two switched capacitors.The output voltage has been boosted u...This paper presents a unique voltage-raising topology for a single-phase seven-level inverter with triple output voltage gain using single input source and two switched capacitors.The output voltage has been boosted up to three times the value of input voltage by configuring the switched capacitors in series and parallel combinations which eliminates the use of additional step-up converters and transformers.The selective harmonic elimination(SHE)approach is used to remove the lower-order harmonics.The optimal switching angles for SHE is determined using the genetic algorithm.These switching angles are com-bined with a level-shifted pulse width modulation(PWM)technique for pulse generation,resulting in reduced total harmonic distortion(THD).A detailed com-parison has been made against other relevant seven-level inverter topologies in terms of the number of switches,drivers,diodes,capacitors,and boosting facil-ities to emphasize the benefits of the proposed model.The proposed topology is simulated using MATLAB/SIMULINK and an experimental prototype has been developed to validate the results.The Digital Signal Processing(DSP)TMS320F2812 board is used to generate the switching pulses for the proposed technique and the experimental results concur with the simulated model outputs.展开更多
有选择性的消谐波脉宽调制Selective H arm onic Elim inated-PW M ,简称SH E-PW M )方法具有开关频率小、输出波形质量好和调制比高的特点,是一种频率最优化的PW M 调制方法。本文在介绍三电平SH E-PW M 方法原理的基础上,讨论了如何采...有选择性的消谐波脉宽调制Selective H arm onic Elim inated-PW M ,简称SH E-PW M )方法具有开关频率小、输出波形质量好和调制比高的特点,是一种频率最优化的PW M 调制方法。本文在介绍三电平SH E-PW M 方法原理的基础上,讨论了如何采用DSP LF2407A 实现三电平SH E-PW M 调制的问题。实验结果验证了SH E-PW M 方法的特点。展开更多
考虑到传统二极管钳位型和电容钳位型拓扑应用于6 k V/10 k V高压变频领域时存在的诸多问题,提出了一种有源中点钳位式(ANPC)5电平变流器选择谐波消除脉宽调制(SHE-PWM)控制方法。在分析了ANPC 5电平拓扑各桥臂的基本结构的基础上,建立...考虑到传统二极管钳位型和电容钳位型拓扑应用于6 k V/10 k V高压变频领域时存在的诸多问题,提出了一种有源中点钳位式(ANPC)5电平变流器选择谐波消除脉宽调制(SHE-PWM)控制方法。在分析了ANPC 5电平拓扑各桥臂的基本结构的基础上,建立了ANPC拓扑相关数学模型;分析了5电平SHE-PWM的基本原理,构建了以消除低次谐波为目标的非线性方程组,并基于牛顿迭代法给出N=7时的SHE-PWM相关解域;针对ANPC拓扑存在的飞跨电容稳压问题,分析了飞跨电容的稳压原理,进而给出了冗余电压矢量调度方式。样机实验结果表明,所提ANPC 5电平拓扑SHE-PWM控制方法实现了低开关频率下变流系统的高效控制,在消除系统低次谐波的基础上,保证了直流电容和飞跨电容的稳压效果。展开更多
文摘In order to output sine wave with small degree of distortion and improve stability,a type of inverter power supply is designed based on harmonic elimination pulse-width modulation(PWM)control.The rectifier and filter are added to input circuit of the inverter.Single-phrase full-bridge inverter performs the function of converting direct current into alternating current(DC/AC).In the control circuit,single chip micyoco(SCM)AT89C2051 is used for main control chip to accomplish the hardware design of the control system.A given value of output frequency of the inverter is input in the way of coding.According to the output frequency code which is read,SCM AT89C2051 defined harmonic elimination PWM control data which will be selected.Through internal timing control,the switches are switched under this provision of PWM control data.Then the driving signals of the switches in the inverter are output from I/O of SCM AT89C2051 to realize harmonic elimination PWM control.The results show that adding Newton homotopic algorithm of harmonic elimination PWM control to corresponding software of the control system can make the quality of output voltage of the inverter higher and it will have broad application prospects.
文摘This paper presents a unique voltage-raising topology for a single-phase seven-level inverter with triple output voltage gain using single input source and two switched capacitors.The output voltage has been boosted up to three times the value of input voltage by configuring the switched capacitors in series and parallel combinations which eliminates the use of additional step-up converters and transformers.The selective harmonic elimination(SHE)approach is used to remove the lower-order harmonics.The optimal switching angles for SHE is determined using the genetic algorithm.These switching angles are com-bined with a level-shifted pulse width modulation(PWM)technique for pulse generation,resulting in reduced total harmonic distortion(THD).A detailed com-parison has been made against other relevant seven-level inverter topologies in terms of the number of switches,drivers,diodes,capacitors,and boosting facil-ities to emphasize the benefits of the proposed model.The proposed topology is simulated using MATLAB/SIMULINK and an experimental prototype has been developed to validate the results.The Digital Signal Processing(DSP)TMS320F2812 board is used to generate the switching pulses for the proposed technique and the experimental results concur with the simulated model outputs.
文摘有选择性的消谐波脉宽调制Selective H arm onic Elim inated-PW M ,简称SH E-PW M )方法具有开关频率小、输出波形质量好和调制比高的特点,是一种频率最优化的PW M 调制方法。本文在介绍三电平SH E-PW M 方法原理的基础上,讨论了如何采用DSP LF2407A 实现三电平SH E-PW M 调制的问题。实验结果验证了SH E-PW M 方法的特点。
文摘考虑到传统二极管钳位型和电容钳位型拓扑应用于6 k V/10 k V高压变频领域时存在的诸多问题,提出了一种有源中点钳位式(ANPC)5电平变流器选择谐波消除脉宽调制(SHE-PWM)控制方法。在分析了ANPC 5电平拓扑各桥臂的基本结构的基础上,建立了ANPC拓扑相关数学模型;分析了5电平SHE-PWM的基本原理,构建了以消除低次谐波为目标的非线性方程组,并基于牛顿迭代法给出N=7时的SHE-PWM相关解域;针对ANPC拓扑存在的飞跨电容稳压问题,分析了飞跨电容的稳压原理,进而给出了冗余电压矢量调度方式。样机实验结果表明,所提ANPC 5电平拓扑SHE-PWM控制方法实现了低开关频率下变流系统的高效控制,在消除系统低次谐波的基础上,保证了直流电容和飞跨电容的稳压效果。
