异质功率器件组合型多电平电路的拓扑演化方法与混频调制技术研究
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1.异质功率器件混合型多电平变换器拓扑衍生与调制优化
- 关键词：
- 异质功率器件混合型变换器;多电平变换器;碳化硅MOSFET;拓扑衍生;调制;软开关;中压系统
- 张一凡
- 指导老师：浙江大学 何湘宁
- 0年
- 学位论文
大容量电力电子变换器是电气化交通、交直流输配电、大型数据中心和国防军事装备等国家重点发展领域中的电能转换与高效利用的基础与核心。多电平变换器具有功率器件电压应力小、波形质量好、功率密度高等优点,是实现中压大容量交流-直流电能变换的优选解决方案,在工业界得到广泛应用。然而,随着常用的硅基功率器件逐渐逼近其理论极限,基于硅基器件的多电平变换器性能已很难进一步提升。以碳化硅MOSFET为代表的高性能宽禁带器件受高价格制约,仍未实现大规模商业化应用。针对以上问题,本文基于碳化硅和硅器件混合应用的异质功率器件混合型多电平变换器方案,深入研究其拓扑构造衍生方法与调制策略,提出一系列异质器件混合型多电平变换拓扑及其优化调制方法,为大容量高性能电力变换场合提供高性能低成本解决方案。首先,提出了异质功率器件混合型多电平变换器拓扑构造方法与通用调制策略。所提出的拓扑构造方法包含了基本单元的定义,保证混合型拓扑结构的基本准则,以及衍生混合型拓扑的特定步骤。基于此,提出了一系列异质功率器件混合型拓扑。通过选择这些混合型拓扑的冗余开关状态,提出了一种异质功率器件混合型拓扑的通用调制策略,可将高频的开关切换都集中于碳化硅器件上。仿真和实验验证了所提出拓扑衍生方法和通用调制策略的有效性,从而为新拓扑的提出提供指导。其次,提出了硅二极管-碳化硅MOSFET异质功率器件混合型整流器。所提出的整流器每相电路仅需要四个具有较低阻断电压的碳化硅MOSFET。同时由于缓冲电容的存在,所有的硅二极管均等效工频动作,并且碳化硅MOSFET能够被有效箝位。本文详细分析了该异质功率器件混合型整流器的工作原理,进一步提出了其调制和控制策略,保证了整流器电容电压平衡以及单位功率因数输出。仿真和实验验证了所提出混合型整流器的有效性。所提出的整流器在效率和成本方面的优势被评估和证明。最后,提出了基于异质功率器件混合型四电平变换器的多步软开关调制策略。本文根据所提出的异质功率器件混合型变换器拓扑构造方法衍生得到了异质功率器件混合型四电平逆变器和整流器,其每相电路仅需要两个碳化硅MOSFET。分别针对这两种混合型拓扑,详细分析了其在多步软开关调制策略下的换流过程。所提出的调制策略,同时实现了混合型四电平变换器中所有硅器件的软开关和直流母线中点电压的平衡。仿真验证了本文所提出的调制策略的可行性和有效性。
...2.A SiC and Si Hybrid Five-Level Unidirectional Rectifier for Medium Voltage Applications
- 关键词：
- Rectifiers; Silicon carbide; Silicon; MOSFET; Schottky diodes; Switches;Capacitors; Active front end (AFE); five-level rectifier; hybridrectifier; medium voltage (MV); silicon carbide (SiC);CONVERTER; TRANSFORMER
- Zhang, Yifan;Li, Chushan;Li, Chengmin;Xin, Zhen;Chen, Runtian;Li, Wuhua;He, Xiangning;Ma, Hao
- 《IEEE TRANSACTIONS ON INDUSTRIAL ELECTRONICS》
- 2022年
- 69卷
- 8期
- 期刊
Following the continuous development of wide bandgap (WBG) devices and multilevel converter technology, medium voltage active front ends are becoming promising in future high-power-density and high-power applications. However, the cost issue is one of the major drawbacks, which stops the WBG devices from being widely applied in high-power areas. This article proposes a silicon carbide (SiC) and silicon (Si) hybrid five-level unidirectional rectifier. It requires only four SiC MOSFETs with relatively low blocking voltage and four Si diodes. Meanwhile, by adding snubber capacitors, all the Si devices are with low-speed switching, and the voltage stresses of fast SiC MOSFETs are minimized. In this article, operational analysis and carrier-based phase-disposition pulsewidth modulation scheme for this circuit are discussed in detail. The capacitor voltage balancing and unity power factor are both realized. Simulation and scaled-down experimental results are demonstrated to verify the proposed rectifier. Furthermore, the comparison of the hybrid five-level rectifiers is given to show the advantages of the proposed rectifier in terms of voltage stress, efficiency, and cost.
...3.Control Optimization of Modular Multilevel Resonant DC Converters for Wide-Input-Range MVdc to LVdc Applications
- 关键词：
- Switches; Switching frequency; Power transformer insulation; Voltagecontrol; Regulation; Zero voltage switching; Zero current switching;Medium-voltage dc (MVdc); modulation index regulation; modularmultilevel resonant dc converter (MMRDC); switching frequencyregulation; wide input range;DUAL-ACTIVE-BRIDGE; DC/DC CONVERTERS; POWER; TRANSFORMER; OPERATION;SYSTEM
- Sheng, Jing;Chen, Cong;Lu, Rui;Li, Chushan;Xiang, Xin;Li, Wuhua;He, Xiangning
- 《IEEE TRANSACTIONS ON POWER ELECTRONICS》
- 2022年
- 37卷
- 5期
- 期刊
In this article, the output voltage control strategy of modular multilevel resonant dc converters (MMRDC) for medium-voltage wide-input-range applications is studied. First, the feasibility and influence of the switching frequency regulation and modulation index regulation are investigated in detail. It is found that the switching frequency choice has a significant effect on the voltage stress of arm inductors and the transformer. Then, based on these considerations, the modulation index regulation plus switching frequency regulation based design and control optimization is proposed. With the proposed design and control method, the switching frequency range for adapting to a wide input range is further reduced, especially under light load operating conditions. Besides, the high voltage stress on arm inductors is avoided and the high voltage dv/dt on the transformer is also eliminated. Finally, a laboratory prototype with 8-16 kV input and 375 V/60 kW output has been built and the experimental validation under a wide input range has been done. The efficiency over 96.4% under the wide input range proved the effectiveness of the optimized control methods.
...4.一种混合型三相四电平有源中点箝位变换器及其多步软开关SPWM控制方法
- 发明人:
- 授权日:}
- 专利
5.一种五电平高效整流器
- 发明人:
- 授权日:}
- 专利
6.一种应用于混合型有源中点钳位式三电平变换器的调制方法
- 发明人:
- 授权日:}
- 专利
7.一种高效整流器
- 发明人:
- 授权日:}
- 专利
8.一种模块化多电平换流器拓扑及其调制方法
- 发明人:
- 授权日:}
- 专利
9.一种应用于混合型三相三电平有源中点箝位式变换器的空间矢量控制方法
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- 授权日:}
- 专利
10.Buck-Boost Type High Voltage DC Auxiliary Power Supply for Medium Voltage DC System
- Lin Zhu；Chushan Li；Huan Yang；Huiqiang Yan；Wuhua Li；Xiangning He；
- 0年
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