考虑子模块均压约束的混合型模块化多电平换流器损耗分析

doi:10.16180/j.cnki.issn1007-7820.2021.08.012

Abstract

Abstract:

The voltage level and transmission capacity of flexible DC transmission projects are constantly increasing, and the loss of modular multilevel converter has attracted much attention. At present, the commonly used loss analysis methods are for the analysis and calculation of full-bridge and half-bridge modular multilevel converters. Based on the operating characteristics of the hybrid modular multilevel converter, a hybrid MMC loss analysis method that considers the constraints of submodule voltage sharing is proposed in this study. According to the reference direction of the voltage and current of the hybrid MMC bridge arm in a control cycle, the sub-module switching situation is analyzed.The mathematical model of the hybrid MMC is established according to the switching situation of different types of sub-modules for loss analysis calculation. By extracting the loss data of the insulated gate bipolar transistor to fit and establish a mathematical model, the detailed analysis of the mutual influence between the junction temperature and the loss of the converter is carried out. Finally, experimental simulation analysis is performed to verify the accuracy of the proposed method.

Key words: modular multilevel converter, voltage balancing constraint, hybrid MMC, converter loss, junction temperature estimation, loss analysis, switching loss, conduction loss

CLC Number:

TN710

ZHANG Jie,ZENG Guohui,HUANG Bo. The Loss Calculation and Analysis of Hybrid Modular Multilevel Converter Considering Sub-Module Balancing Constraint[J].Electronic Science and Technology, 2021, 34(8): 71-78.

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系统参数	数值
子模块个数/个	22
HBSM个数/个	10
FBSM个数/个	10
桥臂电感L₀/mH	10
子模块电容电压容值C/μF	1 000
子模块电容电压额定值U_C/V	100
控制周期	0.001
直流电压/V	2 200

开关能量	a	b	c
E_on	-0.000 586	2.435	528.493 3
E_off	0.000 070 6	4.005	374.200 0
E_rec	-0.000 672	2.283	604.300 0

The Loss Calculation and Analysis of Hybrid Modular Multilevel Converter Considering Sub-Module Balancing Constraint

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