串联型12脉波整流器无源脉波倍增策略  

Passive Pulse Doubling Strategy for Series-Connected 12-Pulse Rectifier

作　　者：李泉慧 李峰 殷昕羽 吴晋蒙 孟凡刚[1] Li Quanhui;Li Feng;Yin Xinyu;Wu Jinmeng;Meng Fangang(School of Electrical Engineering and Automation Harbin Institute of Technology Harbin 150001,China)

机构地区：[1]哈尔滨工业大学电气工程及自动化学院,哈尔滨150001

出　　处：《电工技术学报》2023年第S01期136-146,186,共12页Transactions of China Electrotechnical Society

基　　金：国家自然科学基金资助项目(51777042)。

摘　　要：多脉波整流器作为交流发电机与直流母线的通用接口,在航空航天、船舶电推进等领域有着广泛的应用。为了提高串联型多脉波整流器的电能质量,并增强其可靠性,提出一种无源脉波倍增策略。根据整流器的拓扑结构,分析整流器的工作模态,并根据工作模态研究整流器的工作波形;根据整流器的拓扑结构以及工作波形,得到输入电压与注入变压器匝数比的定量关系,并根据定量关系获得最优匝比,完成无源脉波倍增电路的设计。实验结果表明,使用脉波倍增策略后,整流器输入电压的总谐波畸变率(THD)由8.6%降至4.4%,输入电流的THD由6.5%降至2.6%,注入变压器容量仅为负载功率的2%。所提出的无源脉波倍增策略成本低、损耗小,且具有良好的谐波抑制能力。Multi-pulse rectifiers(MPRs)are converters that the output voltage has more than 6 pulses per power cycle.According to the connection of the rectifier bridges,MPRs are divided into parallel-type and series-type.Compared to the parallel-type MPRs,the series-type MPRs have higher output voltage level.Thus the series-type MPRs are widely served as interfaces between AC generator and DC bus such as aviation power system and ship power system.However,the nonlinearity of the rectifier devices leading to lots of harmonic pollution to the power grid.To improve the power quality and reliability of series-connected MPRs,a passive pulse doubling strategy is proposed.Through installing a set of ancillary circuit at DC link to inject three-step voltage whose frequency is six times of the supply frequency between the two rectifier bridges to suppress the low order harmonics of the rectifier,and the level of the three-step voltage is determined by the turn ratio of the injection transformer.The ancillary circuit is composed of a single-phase injection transformer and two diodes.According to the topology of the converter,the operation modes of the rectifier are analyzed and the operating waveforms of the rectifier are researched.Based on the operation mode,the input voltage and input current of the rectifier are analyzed,then the relationship between the input voltage and the turn ratio of the injection transformer is obtained.When the turn ratio of the injection transformer is 3:2:6,the THD value of the input voltage is the lowest,and each operation mode has the same duration,the lowest theorical THD value of the input voltage is about 7.74%.To verify the above theoretical analysis,the laboratorial platform is built,and the circuits are debugged.The input phase voltage of the rectifier is about 220 V and the power level of the converter is about 2 kV·A.The results of experiment shows that the input voltage of the rectifier with pulse doubling strategy is modulated from 12-step wave to 24-step wave,the input voltage and input c

关 键 词：串联型多脉波整流器 无源脉波倍增策略 电能质量 

分 类 号：TM461[电气工程—电器]