A Control Scheme Based on Lyapunov Function for Cascaded H-Bridge Multilevel Active Rectifiers
A Control Scheme Based on Lyapunov Function for Cascaded H-Bridge Multilevel Active Rectifiers
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DOI：
10.1109/apec39645.2020.9124234
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发表时间：
2020-03
期刊：
影响因子：
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通讯作者：
Garry Jean-Pierre;N. Altin;Ahmad El Shafei;A. Nasiri
中科院分区：
文献类型：
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作者：
Garry Jean-Pierre;N. Altin;Ahmad El Shafei;A. Nasiri
级联H桥多电平有源整流器是一种重要的变换器结构。它具有令人信服的优势，包括在固态变压器、牵引应用、中高功率电机驱动和电池充电器等多种应用中的高度可调性。然而，当H桥在不平衡负载和不对称电压条件下工作时，设计先进的控制策略以保持系统的稳定性变得重要。在本研究中，提出一种基于李雅普诺夫函数的控制方法，以控制单相级联H桥有源整流器达到全局渐近稳定。在传统的基于李雅普诺夫函数的稳定控制方法中加入电容电压反馈，以最小化LCL滤波器的谐振。此外，采用比例谐振（PR）控制方法来获得参考电流信号。这增加了电流控制方案的鲁棒性。直流电压平衡控制程序也被用来防止H桥之间的不平衡的直流电压条件。直流电压通过PI控制器控制。仿真和实验研究验证了该控制方法的性能。
The cascaded H-bridge multilevel active rectifier is a prominent converter configuration. It presents compelling advantages, including high adjustability for a number of applications, such as in solid-state transformers, traction applications, medium and high power motor drives and battery chargers. However, when the H-bridge is operating under an unbalanced load and asymmetrical voltage conditions, it becomes important to design advanced control strategies to maintain the stability of the system. In this study, a Lyapunov-function based control method is proposed for controlling the single-phase cascaded H-bridge active rectifier to achieve global asymptotic stability. A capacitor voltage feedback is added to the conventional Lyapunov-function based stabilizing control method to minimize the resonance of the LCL filter. Additionally, a Proportional-Resonant (PR) control approach is adopted to obtain the reference current signal. This increases the robustness of the current control scheme. A DC voltage balancing control procedure is also employed to prevent the unbalanced DC voltage conditions among the H-bridges. The DC voltage is controlled via a PI controller. The capability of the control approach is verified with simulation and experimental studies.