Purpose

This paper aims to study a multi-level reinjection current source converter (MLR-CSC) that adds attracting properties such as the self-commutation and pulse multiplication to the thyristor converter, which is of great significance for increasing the device capacity and reducing current harmonics on the grid side. Particularly, designing advantageous driving methods of the reinjection circuit is a critical issue that impacts the harmonic reduction and operation reliability of the MLR-CSC.

Design/methodology/approach

To deal with the mentioned issue, this paper takes the five-level reinjection current source converter (FLR-CSC), which is a type of the MLR-CSC, as the research object. Then, a method that can fully use combinations of five-level reinjection switching functions based on the concept of decomposition and recombination is proposed. It is worthy to mention that the proposed method can be easily extended to other multi-level reinjection circuits. Moreover, the working principle of the three-phase bridge circuit based on semi-controlled thyristors in the FLR-CSC that can achieve the four-quadrant power conversion is analyzed in detail.

Findings

Finally, the simulation and experimental results of FLR-CSC verify the effectiveness of the proposed reinjection circuit driving method and the operating principle of four-quadrant power conversion in this paper.

Originality/value

The outstanding features of the proposed driving method for FLR-CSC in this paper include combinations of reinjection switching functions that are fully exploited through three simple steps and can be conveniently extended to other multi-level reinjection circuits.

中文翻译：

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用于晶闸管变流器自换向的改进型并联五电平回注CSC

目的

本文旨在研究一种多电平再注入式电流源换流器(MLR-CSC)，该换流器在晶闸管换流器的基础上增加了自换流和脉冲倍增等吸引特性，对于提高器件容量和降低电流谐波具有重要意义。在网格侧。特别是，设计有利的回馈电路驱动方法是影响 MLR-CSC 的谐波降低和运行可靠性的关键问题。

设计/方法/途径

针对上述问题，本文以MLR-CSC的一种类型——五电平再注入电流源换流器（FLR-CSC）为研究对象。然后，基于分解和重组的概念，提出了一种可以充分利用五级再注入切换函数组合的方法。值得一提的是，所提出的方法可以很容易地扩展到其他多级再注入电路。并详细分析了FLR-CSC中基于半控晶闸管的三相桥式电路实现四象限功率变换的工作原理。

发现

最后，FLR-CSC的仿真和实验结果验证了本文提出的回馈电路驱动方法和四象限功率变换工作原理的有效性。

原创性/价值

本文提出的 FLR-CSC 驱动方法的突出特点包括通过三个简单步骤充分利用再注入开关功能的组合，并且可以方便地扩展到其他多级再注入电路。