Line-Interactive UPS for Low-Voltage Microgrids

Line-interactive uninterruptible power supply (UPS) systems are good candidates for providing energy storage within a microgrid. In this paper, a control scheme for a line-interactive UPS system applied in a low-voltage microgrid is presented. It is based on the Q-w and P-E droop control to achieve a seamless transition between grid-connected and stand-alone operation modes. Moreover, a new model for designing the controllers is built in the dq-frame based on the instantaneous power definition. The new-built model takes into account the dynamic performance of the output impedance of the inverter in the dq-frame and can be evaluated in the time domain. Compared to the traditional model based on the instantaneous power definition, the new-built model is more accurate to describe the dynamic performance of the system. Simulation and experimental results obtained with a microgrid consisting of two 40-kW line-interactive UPS systems are given to validate the control strategy of the line-active UPS system and the accuracy of the new-built model.

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Cite this article

[IEEE Style]

P. Zhang, H. Cai, H. Zhao, J. Shi, X. He, "Line-Interactive UPS for Low-Voltage Microgrids," Journal of Power Electronics, vol. 15, no. 6, pp. 1628-1639, 2015. DOI: 10.6113/JPE.2015.15.6.1628.

[ACM Style]

Ping Zhang, Huanyu Cai, Hengyang Zhao, Jianjiang Shi, and Xiangning He. 2015. Line-Interactive UPS for Low-Voltage Microgrids. Journal of Power Electronics, 15, 6, (2015), 1628-1639. DOI: 10.6113/JPE.2015.15.6.1628.