Multicarrier PWM With DC-Link Ripple Feedforward Compensation for Multilevel Inverters
Multicarrier PWM With DC-Link Ripple Feedforward Compensation for Multilevel Inverters
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DOI：
10.1109/tpel.2007.911834
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发表时间：
2008-01
影响因子：
6.7
通讯作者：
S. Kouro;P. Lezana;Mauricio Angulo;José Rodríguez
中科院分区：
文献类型：
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作者：
S. Kouro;P. Lezana;Mauricio Angulo;José Rodríguez
与大多数功率转换器拓扑结构一样，多电平逆变器使用调制技术进行控制，该技术在概念上基于假定直流链路电压恒定的非线性波形合成。然而，实际应用具有负载和电源相关的直流链路，通常存在重要的低频纹波，这些纹波也被调制并传输到负载，产生不希望的低频电压和电流畸变。本文将一种简单有效的直流纹波前馈策略引入到传统的载波调制技术中。测量直流链路波纹，并在调制阶段直接用于修改载波或基准。仿真和实验结果表明，该方法能够有效地消除负载电流中的低次谐波。
Like most power converter topologies, multilevel inverters are controlled with modulation techniques that are conceptually based on nonlinear waveform synthesis assuming constant dc-link voltages. However, real applications have load and supply dependent dc-links that usually present important low frequency ripple, which is also modulated and transmitted to the load, generating undesirable low frequency voltage and current distortion. This paper introduces a simple but effective dc-link ripple feedforward strategy into traditional carrier-based modulation techniques. The dc-link ripples are measured and used to modify the carriers or the reference directly in the modulation stage. Simulation and experimental results show the accuracy of the proposed method, eliminating low order harmonics in the load current.