电工技术学报  2023, Vol. 38 Issue (zk1): 136-146    DOI: 10.19595/j.cnki.1000-6753.tces.L10084
电力电子 |
串联型12脉波整流器无源脉波倍增策略
李泉慧, 李峰, 殷昕羽, 吴晋蒙, 孟凡刚
哈尔滨工业大学电气工程及自动化学院 哈尔滨 150001
Passive Pulse Doubling Strategy for Series-Connected 12-Pulse Rectifier
Li Quanhui, Li Feng, Yin Xinyu, Wu Jinmeng, Meng Fangang
School of Electrical Engineering and Automation Harbin Institute of Technology Harbin 150001 China
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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。
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关键词 串联型多脉波整流器无源脉波倍增策略电能质量    
Abstract: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 current of the rectifier are closer to sine wave, the experimental results of the THD value of input voltage decrease from 8.6% to 4.4%, and the experimental results of the THD value of input current decrease from 6.5% to 2.6%, which up to the standard of IEEE 519—1992. The load voltage and current remain constant; The capacity of the injection transformer is about 2% of the load power, which is reduced by 15% to 35% compared to the previous research. The proposed pulse doubling strategy has considerable harmonic suppression ability with low cost. The proposed rectifier has the advantages of simple structure, high reliability, low cost, and good harmonic suppression ability, so that it can be served as a general interface of AC and DC bus. Besides, according to the previous research, the more steps of the injection voltage, the better the harmonic suppression ability, the proposed pulse doubling strategy can serve as the basic unit for other harmonic suppression strategy with better harmonic suppression ability.
Key wordsSeries-connected multi-pulse rectifier    passive pulse doubling strategy    power quality   
收稿日期: 2023-01-13      出版日期: 2023-11-09
PACS: TM461  
基金资助:国家自然科学基金资助项目(51777042)
通讯作者: 孟凡刚 男,1982年生,教授,博士生导师,研究方向为电能变换与电能质量控制。E-mail:mfg0327@sina.com   
作者简介: 李泉慧 男,1996年生,博士,研究方向为电能变换与电能质量控制。E-mail:liquanhui0413@163.com
引用本文:   
李泉慧, 李峰, 殷昕羽, 吴晋蒙, 孟凡刚. 串联型12脉波整流器无源脉波倍增策略[J]. 电工技术学报, 2023, 38(zk1): 136-146. Li Quanhui, Li Feng, Yin Xinyu, Wu Jinmeng, Meng Fangang. Passive Pulse Doubling Strategy for Series-Connected 12-Pulse Rectifier. Transactions of China Electrotechnical Society, 2023, 38(zk1): 136-146.
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