Voltage stability is one of the critical factors for the stable operation of DC microgrids (MG). For the communication free DC MG, the DC voltage is more vulnerable due to the DC voltage deviation caused by the droop characteristics. When facing the transient power fluctuation caused by multiple electric vehicles (EVs) connected to the grid, PV shedding, etc., the DC bus will have a large voltage sag. The voltage quality degradation will bring adverse effects to the DC MG. However, most energy storage systems like battery energy storage systems (BESS) are not suitable for suppressing transient large power fluctuation. In this paper, the SMES is introduced to a DC MG to form a power regulation system. A voltage-based segmented (VBS) control is designed for the SMES-based power regulation system to suppress transient large power fluctuation in the DC MG. The voltage deviation caused by power distribution can be tolerant by VBS controlled SMES. Meanwhile, the dynamic recovery capability of the DC voltage is improved. The control method of SMES is independent of other devices in DC MGs, hence it is not dependent on communication. The control strategy of the SMES is further verified by simulation results.

中文翻译：

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孤岛直流微电网瞬态功率波动抑制的超导磁储能电压分段控制

电压稳定性是直流微电网（MG）稳定运行的关键因素之一。对于无通信直流MG，由于下垂特性引起的直流电压偏差，直流电压更容易受到影响。当面临多辆电动汽车（EV）并网、光伏脱落等引起的瞬时功率波动时，直流母线会出现较大的电压跌落。电压质量下降会给直流MG带来不利影响。然而，大多数储能系统如电池储能系统（BESS）并不适合抑制瞬态大功率波动。在本文中，SMES 被引入到直流 MG 以形成一个功率调节系统。基于电压的分段（VBS）控制是为基于SMES的功率调节系统设计的，以抑制直流MG中的瞬态大功率波动。VBS 控制的 SMES 可以容忍由配电引起的电压偏差。同时，提高了直流电压的动态恢复能力。SMES 的控制方法独立于 DC MG 中的其他设备，因此它不依赖于通信。仿真结果进一步验证了SMES的控制策略。