摘要
在中长距离直流电力传输过程中,采用性能良好的直流变换器可以避免传输线上谐波的影响,降低线路功率损耗。在电力电子领域高压直流传输技术中,需满足的要求有:脐带电缆要求较细、变换器要求体积小、重量轻等等,所以将半桥三电平直流变换器应用于电力电子中高压传输中,并且对开关器件中的高频化软开关技术进行了研究。针对传统半桥三电平电路中出现的占空比丢失以及实现开关器件的零电压开关(ZVS)的条件,在采用移相控制方法的基础上,在电路拓扑中加入了隔离电容,采用倍流整流电路,并将其应用于中高压传输中,对传统与改进的DC/DC变换器分别进行了Matlab/Simulink仿真对比,最后通过实验验证了改进型的DC/DC变换器拓扑结构的可行性。
In the process of DC power transmission over middle and long distances,the good performance of the DC converter can avoid the influence of harmonic and reduce the loss on the transmission line.In the field of electronics,high voltage DC feeding technology meets the requirements of thinner umbilical cable diameter, smaller size and lighter weight of the converter.This paper studies the three-level DC/DC converter topology and applies it in high-voltage DC power transmission.In view of the loss of duty ratio and conditions of realizing the ZVS of switches, based on phase-shift PWM control,the isolation capacitor is added to the circuit topology and the current-doubler rectifier circuit is used and applied in the power transmission of median and high voltage.Simulation analysis by Matlab/Simulink is conducted respectively on the traditional and improved DC/DC converters and the experiment has verified the feasibility of the improved DC/DC converter.
出处
《电网与清洁能源》
北大核心
2017年第1期44-49,56,共7页
Power System and Clean Energy
基金
三峡大学人才科研启动项目(KJ2014B048)
湖北省微电网工程技术研究中心开放基金(2015KDW11)
国家自然科学基金青年科学基金(51407104)~~
