Modular Multilevel Converter (MMC) is widely used in applications such as High Voltage Direct Current (HVDC) transmission, AC/DC power conversion centers, and large-scale power quality management in electrical grids due to its highly modular structure, strong redundancy and low harmonic content in AC output. The application of the traditional deadbeat predictive current control to MMC enhances the fast tracking ability of the output current, but it still has the problems of low output current accuracy and high dependence on bridge arm inductor. Based on this, this paper proposes an improved two-beat deadbeat synchronous predictive current control based on Newton interpolation method. By improving the two-beat deadbeat synchronous predictive current control strategy, the accuracy of the output current can be further improved and its fast tracking ability can be enhanced. Newton interpolation is introduced to improve the accuracy of the output current while reducing the dependence on the bridge arm inductor. The results show that the control strategy proposed in this paper reduces the output current THD by 2.88% compared with the two-beat deadbeat predictive current control, thus improving the accuracy; the bridge arm inductor value is reduced by 1.28%, thus reducing the dependence; and under the transient environment, the output current can be tracked to its predicted reference value 843 μs in advance, which enhances the fast tracking capability.

中文翻译：

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基于牛顿插值法的改进MMC二拍无拍同步预测电流控制策略

模块化多电平变流器（MMC）由于其高度模块化的结构、强冗余性和低功耗等特点，被广泛应用于高压直流（HVDC）输电、交直流电力转换中心以及电网大规模电能质量管理等领域。交流输出中的谐波含量。将传统的无差拍预测电流控制应用于MMC，增强了输出电流的快速跟踪能力，但仍然存在输出电流精度低、对桥臂电感依赖性高的问题。基于此，本文提出一种基于牛顿插值法的改进型二拍无差拍同步预测电流控制。通过改进二拍无差拍同步预测电流控制策略，可以进一步提高输出电流的精度，增强其快速跟踪能力。引入牛顿插值法，提高输出电流的精度，同时减少对桥臂电感的依赖。结果表明，本文提出的控制策略与二拍无差拍预测电流控制相比，输出电流THD降低了2.88%，从而提高了精度；桥臂电感值降低了1.28%，从而降低了依赖性；在瞬态环境下，输出电流可提前843μs跟踪至其预测参考值，增强了快速跟踪能力。