Switching-Based Optimized Sliding-Mode Control for Capacitor Self-Voltage Balancing Operation of Seven-Level PUC Inverter
Switching-Based Optimized Sliding-Mode Control for Capacitor Self-Voltage Balancing Operation of Seven-Level PUC Inverter
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DOI：
10.1109/tie.2020.2978704
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发表时间：
2021-04-01
影响因子：
7.7
通讯作者：
Al-Haddad, Kamal
中科院分区：
文献类型：
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作者：
Babaie, Mohammad;Sharifzadeh, Mohammad;Al-Haddad, Kamal
七电平U型单元（PUC 7）是一种低成本的低元件多电平逆变器。然而，PUC 7的挑战是电容器电压平衡;因此，它通常需要集成到电流控制环路中的附加电压控制。由于额外的变量，控制问题进一步复杂的并网PUC 7。本文提出了一种基于电流动态模型的优化滑模控制（OSMC），以跟踪负载电流参考，并在并网和独立运行的电容器电压的自平衡。通过使用基于视觉的优化方法优化OSMC控制因子，PUC 7开关操作被控制为在需要任何额外的电压控制器时自平衡电容器电压。一个自适应控制律也提出了自调整的PUC 7电流参考跟踪负载和直流电源的变化。PUC 7的实验和仿真结果证明了所提出的OSMC在实现电容器自电压平衡操作方面的优异性能。
Seven-level packed U-cell (PUC7) is known as a cost-effective low-component multilevel inverter. However, PUC7 challenge is the capacitor voltage balancing; so, it conventionally needs an additional voltage control integrated into the current control loop. Because of extra variables, the control problem is further complicated for the grid-connected PUC7. This article proposes an optimized sliding-mode control (OSMC) based on the current dynamical model to track the load current reference and to self-balance the capacitor voltage in both grid-connected and stand-alone operations. By optimizing the OSMC control factor using a visual-based optimization method, PUC7 switching operation is controlled to self-balance the capacitor voltage while any extra voltage controller is needed. An adaptive control law has been also proposed for self-tuning of the PUC7 current reference to track the load and dc source variations. Experimental and simulation results of PUC7 prove the excellent performance of the proposed OSMC in achieving capacitor self-voltage balancing operation.