摘要
基于电感电流临界导通模式(critical conduction mode,CRM)的控制型软开关技术可实现开关管零电压开通(zero voltage switching,ZVS),但传统恒定电流复位方法的反向电流大,开关管通态损耗高。文中以单相三电平中点箝位型(three-level neutral point clamped,3L-NPC)逆变器为研究对象,提出一种具有最小电感复位电流的控制方法。首先,分析开关管ZVS的实现条件,建立谐振等效电路分析模型,推导出电感复位电流理论最小值,在保证整个工频周期内开关管ZVS的同时,降低复位电流导致的开关管通态损耗。然后,建立逆变器损耗分析模型,将文中方法与传统恒定电流复位方法进行损耗计算与对比。最后,搭建一台1 kW的单相3L-NPC逆变器样机进行实验,结果表明文中方法相比于传统恒定电流复位方法,降低了损耗,最高变换效率提升约0.5个百分点。
The controlled-type soft-switching technology based on critical conduction mode(CRM)is an effective way to achieve zero voltage switching(ZVS)of switches.However,the high reverse inductor current of the conventional constant boundary conduction mode(CBCM)method leads to high conduction losses.In this paper,the single-phase three-level neutral point clamped(3L-NPC)inverter is taken as an example for analysis,and a minimum reverse inductor current control is proposed.Firstly,the requirement for achieving ZVS of switches is quantitatively analyzed,and the model of the equivalent resonance circuit is built.Accordingly,the theoretical minimum reverse inductor current for achieving ZVS in the fundamental period is derived,which lowers the conduction losses of switches.Then,by establishing the power losses analysis model of the 3L-NPC inverter,the power losses of the proposed scheme and the conventional CBCM method are calculated and compared in detail.Finally,a 1 kW single-phase 3L-NPC inverter prototype is built,and experimental results verify that the proposed method features lower conduction losses than that of the CBCM method.The maximum efficiency of the 3L-NPC inverter is increased by 0.5 percentage point.
作者
吴超
张犁
郑仲舒
王一鸣
WU Chao;ZHANG Li;ZHENG Zhongshu;WANG Yiming(College of Energy and Electrical Engineering,Hohai University,Nanjing 211100,China)
出处
《电力工程技术》
北大核心
2023年第6期153-160,共8页
Electric Power Engineering Technology
基金
国家自然科学基金资助项目(52177176)
江苏省六大人才高峰项目(2019-TD-XNY-001)。
