摘要
工程应用中,大功率变换器大都采用电压源型变换器。为解决常规电流源变换器所遇到的难题,提出了一种注入式多电平电流源型大功率变换器。基于直流侧注入阶梯电流,采用交流侧输出理想正弦交流的注入方法,对变换器注入开关时序、交流侧输出电流和直流侧注入电流变化规律进行分析。研究结果表明,该变换器主电路功率器件的开关频率为工频,降低了开关器件的动态损耗;主桥功率器件在零电流时换相,实现了真正意义上的软开关技术;变换器交流侧不需安装滤波装置就能输出高质量的电流波形。
In engineering applications, high power converter mostly adopts the voltage-source converter. In order to solve the difficult problems encountered by the conventional current-source converter, we proposed a new type of multi-level current-source high-power converter. On the basis of injection step current at direct current side, assuming that output voltage at alternating current side is ideal sinusoidal AC waveforrn, we analyzed the variation rule of the converter injection switching sequence, the output current at the AC side, and the injection current at the DC side. The results show that the switching frequency of main current power devices of converter is grid-power frequency, so it can reduce the dynamic loss of switching device. The main bridge power device commutation happens at zero current to realize the soft switch in a real sense. Moreover, it can output high-quality current waveform without installing filter at the AC side.
出处
《高电压技术》
EI
CAS
CSCD
北大核心
2015年第7期2445-2450,共6页
High Voltage Engineering
基金
国家自然科学基金(51067006)
内蒙古自治区自然科学基金重大项目(2010ZD10)
内蒙古工业大学科学研究基金(ZS201040)~~
关键词
电流源变换器
多电平
纹波注入
交流直流变换
谐波消除
软开关
curent-source converter
multi-level
ripple-injection
AC-DC conversion
suppression of harmonic
soft-switching
