Selective Harmonic Elimination Technique With Control of Capacitive DC-Link Voltages in an Asymmetric Cascaded H-Bridge Inverter for STATCOM Application
Selective Harmonic Elimination Technique With Control of Capacitive DC-Link Voltages in an Asymmetric Cascaded H-Bridge Inverter for STATCOM Application
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DOI：
10.1109/tie.2018.2811365
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发表时间：
2018-11-01
影响因子：
7.7
通讯作者：
Farhangi, Shahrokh
中科院分区：
文献类型：
--
作者：
Sajadi, Rahman;Iman-Eini, Hossein;Farhangi, Shahrokh
本文介绍了一种适用于具有不等容性直流电压的级联H桥静止无功补偿器（CHB-STATCOM）的选择性谐波消除（SHE）技术。非对称拓扑允许增加电压电平的数量，同时保持转换器损耗低。此外，无功功率控制是通过使用解耦电流控制，并通过SHE调制的帮助下控制的各个电容器的电压。推导了具有任意数量H桥单元的CHB逆变器的多电平交流波形合成和直流母线电压调节的数学方程。然后，为了验证理论索赔，仿真和实验结果提供了一个三相CHB逆变器与两个H桥单元在每一个阶段。
In this paper, the selective harmonic elimination (SHE) technique is introduced for a cascaded H-bridge-based static VAR compensator (CHB-STATCOM) with unequal capacitive dc-link voltages. The asymmetric topology allows increasing the number of voltage levels while keeping the converter losses low. Moreover, reactive power control is realized by using the decoupled current control, and the voltage of individual capacitors is controlled by the help of SHE modulation. Mathematical equations are derived for synthesizing the multilevel ac waveform and regulation of dc-link voltages for a CHB inverter with an arbitrary number of H-bridge cells. Then, to verify the theoretical claims, simulation and experimental results are provided for a three-phase CHB inverter with two H-bridge cells in each phase.