基于DMWPWM的三电平NPC变频器改进效率优化调制策略  

Improved Efficiency Optimization Modulation Strategy for Three-level NPC Converter Based on DMWPWM

作　　者：李君 李婉婷 施荣 王倩[2] 李宁[2] LI Jun;LI Wanting;SHI Rong;WANG Qian;LI Ning(Academy of Modern Electric Power Research,North China Electric Power University,Beijing 102206,China;School of Automation and Information Engineering,Xi’an University of Technology,Xi'an 710048,Shaanxi,China;State Grid Shaanxi Electric Power Company Economic Research Institute,Xi'an 710065,Shaanxi,China)

机构地区：[1]华北电力大学现代电力研究院,北京102206 [2]西安理工大学自动化与信息工程学院,陕西西安710048 [3]国网陕西省电力公司经济技术研究院,陕西西安710065

出　　处：《电气传动》2021年第12期3-9,15,共8页Electric Drive

基　　金：电力传输与功率变换控制教育部重点实验室开放课题(2018AC02);陕西省自然科学基础研究计划(2018JM5041);西安市碑林区区科技项目(GX1918)。

摘　　要：针对双调制波载波调制策略(DMWPWM)开关损耗大、效率低的问题,提出了效率优化调制策略,对效率优化策略的调制波解析式进行优化,得到基于DMWPWM的三电平中点钳位(NPC)变流器改进效率优化调制策略。通过引入奇数周期DMWPWM策略+偶数周期DMWPWM策略构成改进效率优化调制策略,推导该调制策略调制波的解析式,并使调制波尽量为其最值来减少开关动作、降低系统开关损耗,该策略可兼顾系统效率同时实现中点电位平衡。通过仿真与实验证明,该策略在10%~100%负载时的系统效率比DMWPWM提高0.3%~0.5%左右,说明改进效率优化策略的可行性。Aiming at the problem of large switching loss and low efficiency of double modulation wave carrierbased PWM(DMWPWM),an efficiency optimization modulation strategy was proposed,and the modulation wave resolution of the efficiency optimization strategy was optimized to obtain an improved efficiency optimization modulation strategy for three-level neutral point clamped(NPC)converter based on DMWPWM.By introducing the odd-period DMWPWM strategy plus even-period DMWPWM strategy to form an improved efficiency optimization modulation strategy,the analytic formula for the modulation wave of the modulation strategy was derived,and the modulation wave was reduced to the extreme value to reduce the switching action and reduce the system switching loss.The strategy could balance system efficiency while achieving midpoint potential balance.Simulation and experiment show that the system efficiency of the strategy is increased by 0.3%to 0.5%compared with DMWPWM at 10%to 100%load,indicating the feasibility of improved the efficiency optimization strategy.

关 键 词：三电平NPC变频器 DMWPWM 改进效率优化 中点电位 

分 类 号：TM46[电气工程—电器]