Low voltage ride through function for the high voltage AC ports of four-port power electronic transformers

NIE Haozhe; SHEN Yu; ZHAO Zhengming; WEN Wusong; YUAN Liqiang

doi:10.16511/j.cnki.qhdxxb.2021.22.035

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Journal of Tsinghua University(Science and Technology) ›› 2021, Vol. 61 ›› Issue (10) : 1097-1105. DOI: 10.16511/j.cnki.qhdxxb.2021.22.035

POWER SYSTEMS

Low voltage ride through function for the high voltage AC ports of four-port power electronic transformers

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Abstract

The widespread use of power electronic transformers in power systems has led to more research on their operational safety and stability. The voltage sag in the alternating current (AC) port of the power electronic transformer caused by a short circuit fault of the grid connection point can lead to serious instabilities which can slow the power grid recovery. The instability mechanism of the high voltage AC port of a modular four-port power electronic transformer is analyzed in terms of the energy characteristics when a voltage sag fault occurs. Then, a low voltage ride through control scheme is given to maintain safe, stable operation of the power electronic transformer during the fault. This scheme provides a low voltage ride through function by switching the power balance port and the power electronic transformer control strategy. Finally, this low voltage ride through control scheme is verified using DSIM simulations which shows that the scheme effectively improves the safety and stability of the power electronic transformer and provides low voltage ride through in multi-port power electronic equipment.

Key words

power electronic transformer / low voltage ride through / power balance / direct current (DC) bus voltage stabilization control / DSIM power electronic simulation

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NIE Haozhe, SHEN Yu, ZHAO Zhengming, WEN Wusong, YUAN Liqiang. Low voltage ride through function for the high voltage AC ports of four-port power electronic transformers[J]. Journal of Tsinghua University(Science and Technology). 2021, 61(10): 1097-1105 https://doi.org/10.16511/j.cnki.qhdxxb.2021.22.035

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