For single-phase current source converter (SCSC), at least one upper device and one lower device have to be gated on and maintained at any time. Otherwise, an open-circuit of the DC-link current would occur and destroy the devices. In addition, a bulky DC-link inductor is usually required to obtain a smooth DC-link current. To address these issues, this study proposes a novel SCSC with high reliability and high-power density. In the proposed circuit, even all the switches are turned on or turned off simultaneously, neither short-circuit nor open-circuit will happen. The inductance in DC-side is reduced significantly byadopting the active power decoupling technique. First, the operation principle of the proposed converter is introduced in detail. Then, a closed-loop control method is presented to regulate the DC-link current, maintain the DC component of the decoupling capacitor voltage, and achieve sinusoidal grid current. Besides, the parameter design of the circuit and controller is investigated. Moreover, the efficiency comparison between the proposed and other SCSCs is carried out. Finally, the effectiveness of the proposed topology is verified by the experimental results.

中文翻译：

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具有高可靠性和高功率密度的单相电流源转换器

对于单相电流源转换器（SCSC），必须随时接通至少一个上设备和一个下设备并进行维护。否则，直流母线电流会开路并损坏设备。另外，通常需要庞大的直流母线电感器以获得平滑的直流母线电流。为了解决这些问题，本研究提出了一种具有高可靠性和高功率密度的新型SCSC。在建议的电路中，即使所有开关同时打开或关闭，也不会发生短路或断路。通过采用有功功率去耦技术，可以大大降低直流侧的电感。首先，详细介绍了所提出的转换器的工作原理。然后，提出了一种调节直流母线电流的闭环控制方法，保持去耦电容器电压的直流分量，并实现正弦波电网电流。此外，还研究了电路和控制器的参数设计。此外，在提议的SCSC和其他SCSC之间进行了效率比较。最后，实验结果验证了所提拓扑结构的有效性。