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A Circulating-Current Suppression Method for Parallel Connected Voltage Source Inverters (VSI) with Common DC and AC Buses

机译：具有公共直流和交流母线的并联电压源逆变器（VsI）的循环电流抑制方法

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摘要

This paper presents a theoretical study with experimental validation of a circulating-current suppression method for parallel operation of three-phase voltage source inverters (VSI), which may be suitable for modular parallel uninterruptible power supply systems or hybrid AC/DC microgrid applications. The basic concept of the proposed circulating-current suppression method is to modify the original current references by using the current difference among the parallel inverters. In the proposed approach, both of cross circulating-current and zero-sequence circulating-current are considered, and added into the conventional droop plus virtual impedance control. In the control architecture, the reference voltages of the inverters are generated by the primary control loop which consists of a droop control and a virtual impedance. The secondary control is used to compensate the voltage drop on the virtual impedance. Further, a circulating-current control loop is added to improve the average current-sharing performance among parallel VSIs. Experimental results are presented to show the effectiveness of the proposed control method to suppress both of the cross and zero-sequence circulating-currents.
机译：本文介绍了一种理论研究，并通过实验验证了用于三相电压源逆变器（VSI）并联运行的循环电流抑制方法，该方法可能适用于模块化并联不间断电源系统或混合AC / DC微电网应用。所提出的循环电流抑制方法的基本概念是通过利用并联逆变器之间的电流差来修改原始电流参考。在提出的方法中，既考虑了交叉循环电流又考虑了零序循环电流，并将其添加到常规的下垂加虚拟阻抗控制中。在控制架构中，逆变器的参考电压由初级控制回路产生，该初级控制回路包括下垂控制和虚拟阻抗。辅助控件用于补偿虚拟阻抗上的电压降。此外，增加了循环电流控制环路以改善并联VSI之间的平均电流共享性能。实验结果表明，所提出的控制方法能够有效地抑制交叉和零序循环电流。

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