一种高性能低成本的中压异质器件混合型模块化多电平变换器及其控制策略  

A High-performance and Low-cost Medium-voltage Heterogeneous Device Hybrid Modular Multilevel Converter and Its Control Strategy

作　　者：周志[1] 涂春鸣[1] 侯玉超 郭祺[1] 任鹏[1] 刘红文 杨金东 ZHOU Zhi;TU Chunming;HOU Yuchao;GUO Qi;REN Peng;LIU Hongwen;YANG Jindong(National Electric Power Conversion and Control Engineering Technology Research Center(Hunan University),Changsha 410082,Hunan Province,China;Electric Power Research Institute of Yunnan Power Grid Co.,Ltd.,Kunming 650000,Yunnan Province,China)

机构地区：[1]国家电能变换与控制工程技术研究中心(湖南大学),湖南省长沙市410082 [2]云南电网有限责任公司电力科学研究院,云南省昆明市650000

出　　处：《电网技术》2024年第9期3686-3694,I0046,I0047-I0049,共13页Power System Technology

基　　金：国家自然科学基金项目(52130704);湖南省研究生科研创新项目(CX20230430)。

摘　　要：针对少子模块数的中压模块化多电平变换器(modular multilevel converter,MMC)装置损耗、成本等指标难以综合提升的问题,该文提出一种基于Si基绝缘栅双极型晶体管(insulated gate bipolar transistor,IGBT)和SiC基金属氧化物半导体场效应晶体管(metal oxide semiconductor field effect transistor,MOSFET)混合的模块化多电平变换器,简称异质器件混合型模块化多电平变换器(heterogeneous device hybrid MMC,HDHMMC)。HDHMMC由全Si IGBT的低频模块和Si IGBT与SiC MOSFET混合的高频模块组成。针对此拓扑提出一种特定的高低频混合调制策略,充分发挥Si IGBT通态损耗低、SiC MOSFET开关损耗低的优势。此外,详细分析了高低频模块的能量波动机理,并针对高低频模块直流侧电容电压不稳定问题提出一种特定的稳压策略。仿真和实验结果验证了HDHMMC拓扑及其调制、稳压策略的可行性。最后,将HDHMMC与现有MMC拓扑进行损耗与成本对比,证明所提拓扑可以更好地平衡成本、效率、功率密度等性能指标。Aiming at the problem that the loss,cost and other indexes of the existing medium voltage modular multilevel converter(modular multilevel converter,MMC)with a small number of submodules are difficult to be comprehensively improved,a hybrid modular multilevel converter based on Si insulated gate bipolar transistor(IGBT)and SiC metal oxide semiconductor field effect transistor(MOSFET)devices is proposed in this paper,referred to as heterogeneous device hybrid modular multilevel converter(heterogeneous device hybrid MMC,HDHMMC).The HDHMMC consists of a low-frequency module of all-Si IGBT devices and a high-frequency module of Si IGBT devices mixed with SiC MOSFET devices.A specific high-and low-frequency hybrid modulation strategy is proposed for this topology,which gives full play to the advantages of low conduction loss of Si IGBT and low switching loss of SiC MOSFET.In addition,the energy fluctuation mechanism of the high frequency modules and low frequency modules is analyzed in detail,and a specific voltage stabilization strategy is proposed for the DC side capacitor voltage instability of the high frequency modules and low frequency modules.The simulation and experimental results verify the feasibility of HDHMMC topology and its modulation and stabilization strategy.Finally,the loss and cost of HDHMMC are compared with the existing MMC,which proves that the proposed topology can better balance the cost,efficiency,power density and other performance indicators.

关 键 词：模块化多电平变换器 Si IGBT SiC MOSFET 混合调制 稳压策略 

分 类 号：TM721[电气工程—电力系统及自动化]