文章摘要
姜卫东,李来保,王金平,等.改进的中点钳位型三电平逆变器非连续脉宽调制策略[J].电力系统自动化. DOI: 10.7500/AEPS20180314005.
Jiang Weidong,Li Laibao,, et al.Improved Discontinuous Pulse Width Modulation Strategy for Neutral Point Clamped Three-Level Inverter[J].Automation of Electric Power Systems. DOI: 10.7500/AEPS20180314005.
改进的中点钳位型三电平逆变器非连续脉宽调制策略
Improved Discontinuous Pulse Width Modulation Strategy for Neutral Point Clamped Three-Level Inverter
DOI:10.7500/AEPS20180314005
关键词: 中点钳位型三电平逆变器  非连续脉宽调制  开关损耗  中点电压
KeyWords: neutral point clamp three-level inverter  discontinuous pulse width modulation  switching loss  neutral point voltage
上网日期:2018-11-06
基金项目:
作者单位E-mail
姜卫东 合肥工业大学电气学院 ahjwd@163.com 
李来保 合肥工业大学电气学院 2499497989@qq.com 
王金平 合肥工业大学电气学院 waupter919@163.com 
翟飞 合肥工业大学电气学院 1347233526@qq.com 
李劲松 合肥工业大学电气学院 1696646336@qq.com 
摘要:
      为了降低开关损耗,非连续脉宽调制(Discontinuous pulse width modulation,DPWM)被广泛应用于中点钳位型三电平逆变器(Neutral point clamped three-level inverter,NPC TLI),但是DPWM在中点电压的控制上表现了某些不足。为了减少NPC TLI的开关损耗并同时控制中点电压,本文采用切换钳位模式来实现对中点电压的有效控制的方法。为了避免在切换钳位模式时引入附加开关动作,本文提出了一种可实现钳位模式无缝切换的新型脉宽序列的DPWM (Novel pulse sequence DPWM,NPSDPWM)。从仿真和实验的角度比较了NPSDPWM,传统DPWM和现有优化DPWM算法的降低开关损耗能力和对中点电压的控制能力。理论分析和实验结果表明,NPSDPWM具有良好的中点电压控制能力以及开关损耗降低能力。
Abstract:
      In order to reduce switching loss, discontinuous pulse width modulation (DPWM) is widely used in neutral point clamped three-level inverter (NPC TLI), but DPWM shows some disadvantages in the control of neutral point voltage (NPV). In order to reduce the switching loss and control NPV simultaneously, the method of switching clamp mode is adopted to realize the effective control of the midpoint voltage in this paper. In order to avoid introducing additional switching action when switching back and forth between different clamping modes, a novel pulse sequence DPWM (NPSDPWM) that can realize seamless switching of clamp mode is proposed in this paper. NPSDPWM is compared with the traditional DPWM and existing optimized DPWM in terms of reducing switching loss ability and NPV control ability based on the simulation and experiment. Theoretical analysis and experimental results show that NPSDPWM has good performance about controlling NPV and reducing switching loss.
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