This article proposed and investigated a near-optimal finite-control-set model-predictive grid current control (NOP-MPGCC) for voltage source inverters (VSIs) with actively damped LCL filters. It carries three advantages: (i) the constant-frequency pulsewidth modulator produces regular switching spectrum—which can ease the LCL filter design process in grid current control applications with medium-to-high carrier ratio; (ii) it avoids the use of the usual first-order assumption in most PI-/PR-based control and the common simplifications adopted in some existing FCS-MPC schemes. This is achieved by considering the third-order behavior using long prediction horizon; and (iii) it can operate near and across the critical frequency, defined using the established classical control definition. Moreover, it retains the intuitive enumeration structure and maximizes the dc-bus utilization through the consideration of entire hexagonal vector space at every control cycle. The theoretical derivation, simulation, and experiment results verify that NOP-MPGCC is potentially a viable direct grid current control scheme for PWM-VSIs with actively damped LCL filters.

中文翻译：

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具有 LCL 滤波器的 PWM 驱动 VSI 的长预测地平线近最优模型预测电网电流控制

本文针对具有有源阻尼 LCL 滤波器的电压源逆变器 (VSI) 提出并研究了一种近乎最优的有限控制集模型预测电网电流控制 (NOP-MPGCC)。它具有三个优点：(i) 恒频脉宽调制器产生规则的开关频谱——这可以简化中高载波比电网电流控制应用中的 LCL 滤波器设计过程；(ii) 它避免了在大多数基于 PI/PR 的控制中使用通常的一阶假设以及在一些现有 FCS-MPC 方案中采用的常见简化。这是通过使用长预测范围考虑三阶行为来实现的；(iii) 它可以在临界频率附近和跨临界频率运行，使用既定的经典控制定义进行定义。而且，它保留了直观的枚举结构，并通过在每个控制周期考虑整个六边形矢量空间来最大化直流总线的利用率。理论推导、仿真和实验结果证实，NOP-MPGCC 是具有有源阻尼 LCL 滤波器的 PWM-VSI 的潜在可行的直接电网电流控制方案。