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首页> 外文期刊>Power Electronics, IET >Analytical determination of conduction power loss and investigation of switching power loss for modified flying capacitor multicell converters
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Analytical determination of conduction power loss and investigation of switching power loss for modified flying capacitor multicell converters

机译：改进的飞跨电容器多单元转换器的传导功率损耗的分析确定和开关功率损耗的研究

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摘要

Considering advantages of modified flying capacitor multicell (MFCM) converter over conventional flying capacitor multicell converter, and noting that conduction loss investigation can be very advantageous in design phase of multilevel converters, this study presents an analytical approach to calculate and investigate conduction losses in MFCM converters. First, rms and average currents of insulated gate bipolar transistors (IGBTs) and anti-parallel diodes are analytically calculated by considering the associated duty cycle of each IGBT/diode in terms of the converter modulation index, load current, and load power factor. Numerical results of derived closed-form equations to calculate rms and average currents of IGBTs/diodes are compared with simulation results and experimental measurements. All simulation, analytic, and experimental results agree well with each other which validate derived closed-form equations. Afterwards, derived equations for rms and average current computations are utilised to calculate the conduction power losses in a 12.4 MVA, 3.3 kV, nine-level (line-to-line) MFCM converter. A 2.5 kV, 1.5 kA IGBT module from ABB is considered as a power switch in the performed case study for MFCM converter. In addition, switching power loss investigation is performed using numeric approach and curve-fitting method for aforementioned MFCM converter. Comparative analysis and evaluation of conduction and switching losses are presented.
机译：考虑到改进的飞电容器多单元（MFCM）转换器相对于传统飞电容器多单元转换器的优势，并注意到传导损耗研究在多电平转换器的设计阶段可能非常有利，本研究提出了一种分析方法来计算和研究MFCM转换器的传导损耗。首先，通过考虑每个IGBT /二极管的相关占空比，根据转换器调制指数，负载电流和负载功率因数来分析计算绝缘栅双极型晶体管（IGBT）和反并联二极管的均方根值和平均电流。将导出的用于计算IGBT /二极管的均方根值和平均电流的闭合形式方程的数值结果与仿真结果和实验测量结果进行了比较。所有的仿真，分析和实验结果都彼此吻合，可以验证导出的闭合形式方程。然后，利用均方根和平均电流计算的推导方程式来计算12.4 MVA，3.3 kV，九级（线对线）MFCM转换器的传导功率损耗。在针对MFCM转换器进行的案例研究中，ABB的2.5 kV，1.5 kA IGBT模块被视为电源开关。另外，对于上述MFCM转换器，使用数值方法和曲线拟合方法来进行开关功率损耗调查。介绍了传导和开关损耗的比较分析和评估。

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