直接数字控制模块化多电平变换器的循环电流抑制

2018 IEEE International Power Electronics and Application Conference and Exposition (PEAC) Pub Date : 2018-11-01 DOI:10.1109/PEAC.2018.8590290

T. -. Wu, T.-C. Chou, J.-W. Huang, K.-E. Lin, T.-Y. Li, K. Sun

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引用次数: 1

摘要

本文研究了采用直接数字控制的模块化多级变换器(MMC)的循环电流抑制方法。含二阶谐波分量的循环电流是MMC控制的关键问题之一，因为它会导致上臂或下臂的大电流和功率损耗。提出了一种直接数字控制方法，可以在不考虑滤波器电感变化的情况下紧密跟踪电感电流指令，并消除循环电流。本文首先介绍了一种MMC结构，然后详细推导了一种用于抑制循环电流的直接数字控制器。120千瓦MMC的仿真结果验证了分析和讨论的正确性。

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Circulating Current Suppression for Modular Multi-level Converters with Direct Digital Control

This paper presents circulating current suppression for modular multi-level converters (MMC) with a direct digital control. Circulating current with a second-order harmonic component is one of the pivotal issues in controlling MMC, since it will result in higher arm current and power loss in either upper or lower arm. A direct digital control is proposed to track inductor current command tightly regardless of wide filter inductance variation and to eliminate circulating current. In this paper, an MMC configuration is introduced first, and then a direct digital controller for circulating current suppression is derived in detail. Simulated results obtained from a 120 kW MMC have verified the analysis and discussion.

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2018 IEEE International Power Electronics and Application Conference and Exposition (PEAC)

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