Self-Adaptive Control of the Sub-Module Voltage for STATCOM Based on Modular Multilevel Converter

Abstract

Abstract:

The harmonic characteristic of sub-module capacitor voltage in modular multilevel converter is analyzed. Based on the result of theoretical analysis, the principle and calculation method for the selection of sub-module capacitance are given. In order to solve the problem of hierarchical control strategy based on carrier shifted PWM modulation and the capacitor voltage sorting control based on nearest level modulation, a novel self-adaptive capacitor voltage balancing algorithm for STATCOM have been presented. The proposed control strategy is verified by simulation Matlab/Simulink, and the results show that this balancing algorithm can achieve low switching losses, fast DC voltage response speed and good dynamic performance.

Key words: Modular multilevel converter, STATCOM, self-adaptive control

CLC Number:

TM46

Zou Jiyong,Huang Qiuyan,Yang Zhi,Yang Lijun. Self-Adaptive Control of the Sub-Module Voltage for STATCOM Based on Modular Multilevel Converter[J]. Journal of Electrical Engineering, 2015, 10(8): 80-85.

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References 11

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参数	数值
额定输出功率P /MW	1
直流电容容值C /μF	2 500
三角载波频率f_c/Hz	1 000
公共母线电压(V_dc= 2V_d) /V	12 000
电容电压初始值V_C_{_}_I_nit /V	12 000/4 = 3 000

参数	数值
三相电网电压V /V	220V/50Hz
额定功率P /kvar	±3
桥臂串联电感L /mH	8
子模块直流侧电容C /μF	470
三角载波频率f /kHz	5