In this article, on the basis of an existing dual layer nested (DLN) adaptive sliding-mode control (ASMC) strategy, an observer-based sliding-mode control strategy with an improved DLN adaptive tuning mechanism (IDLN-ASMC) is proposed for a three-level neutral-point-clamped converter. The proposed controller not only ensures good system performance but also mitigates two problems of the existing DLN-ASMC strategy. Meanwhile, three objectives are achieved. First, an adaptive supertwisting algorithm is utilized in the power tracking loop to converge power tracking errors to bounded regions in finite time. Next, a disturbance observer-based IDLN-ASMC strategy is proposed in the dc-link voltage regulation loop to regulate the dc-link voltage to its reference value. Finally, a simple proportional-integral controller is used in the dc-link voltage-balancing loop to reduce the voltage difference between the two dc-link capacitors. The results of simulation and experiment demonstrate the effectiveness and superiority of the proposed strategy.

中文翻译：

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通过双层嵌套自适应调整技术对 NPC 转换器进行滑模控制


本文在现有的双层嵌套（DLN）自适应滑模控制（ASMC）策略的基础上，提出了一种基于观测器的改进DLN自适应调节机制的滑模控制策略（IDLN-ASMC）。三电平中性点钳位转换器。所提出的控制器不仅确保了良好的系统性能，而且还缓解了现有 DLN-ASMC 策略的两个问题。同时，实现了三个目标。首先，在功率跟踪环路中采用自适应超扭曲算法，以在有限时间内将功率跟踪误差收敛到有界区域。接下来，在直流母线电压调节环路中提出基于扰动观测器的IDLN-ASMC策略，以将直流母线电压调节至其参考值。最后，在直流母线电压平衡环路中使用简单的比例积分控制器来减小两个直流母线电容器之间的电压差。仿真和实验结果证明了该策略的有效性和优越性。