A novel low voltage ride through strategy for cascaded power electronic transformer updates

Jiexiang Han; Xiangping Kong; Peng Li; Zhe Zhang; Xianggen Yin

doi:10.1186/s41601-019-0137-1

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A novel low voltage ride through strategy for cascaded power electronic transformer updates

Original Research | 更新时间：2026-09-30

- A novel low voltage ride through strategy for cascaded power electronic transformer updates
- A novel low voltage ride through strategyfor cascaded power electronic transformer
- 现代电力系统保护与控制（英文） 2019年4卷第3期页码：1-12
- 作者机构：
  
  1. State Key Laboratory of Advanced Electromagnetic Engineering and Technology, Huazhong University of Science and Technology,Wuhan,China
  2. State Grid Jiangsu Electric Power Co. Ltd., Research Institute,Jiangsu,Nanjing,China
- 作者简介：
- 基金信息：
- DOI：10.1186/s41601-019-0137-1
  中图分类号：
- 纸质出版：2019-07-01
- 稿件说明：
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Jiexiang Han, Xiangping Kong, Peng Li, 等. A novel low voltage ride through strategy for cascaded power electronic transformer updates[J]. 现代电力系统保护与控制（英文）, 2019,4(3):1-12.

Jiexiang Han, Xiangping Kong, Peng Li, et al. A novel low voltage ride through strategyfor cascaded power electronic transformer[J]. Protection and Control of Modern Power Systems, 2019, 4(3): 1-12.
Jiexiang Han, Xiangping Kong, Peng Li, 等. A novel low voltage ride through strategy for cascaded power electronic transformer updates[J]. 现代电力系统保护与控制（英文）, 2019,4(3):1-12. DOI： 10.1186/s41601-019-0137-1.

Jiexiang Han, Xiangping Kong, Peng Li, et al. A novel low voltage ride through strategyfor cascaded power electronic transformer[J]. Protection and Control of Modern Power Systems, 2019, 4(3): 1-12. DOI： 10.1186/s41601-019-0137-1.

摘要

In view of the operating characteristics for voltage sags of AC side of the power electronic transformer(PET)

a low-voltage ride through(LVRT) strategy adapted to bidirectional power exchange of PET is proposed for the purposes of maintaining the system stability

assisting the system voltage recovery and protecting PET safety. During the asymmetric voltage sag

the negative sequence current of PET is eliminated to ensure the symmetry of the injected current. According to the degree of positive sequence voltage sag

the reactive current injection is provided to assist in voltage recovery. According to the PET active power condition before the voltage sag

the level and direction of which are maintained as far as possible without exceeding the limit

for which the disturbance to the AC and DC grids is reduced. Finally

the effectiveness of the proposed LVRT strategy is verified by simulation model.

Abstract

In view of the operating characteristics for voltage sags of AC side of the power electronic transformer(PET)

a lowvoltage ride through(LVRT) strategy adapted to bidirectional power exchange of PET is proposed for the purposes of maintaining the system stability

assisting the system voltage recovery and protecting PET safety. During the asymmetric voltage sag

the negative sequence current of PET is eliminated to ensure the symmetry of the injected current. According to the degree of positive sequence voltage sag

the reactive current injection is provided to assist in voltage recovery. According to the PET active power condition before the voltage sag

the level and direction of which are maintained as far as possible without exceeding the limit

for which the disturbance to the AC and DC grids is reduced. Finally

the effectiveness of the proposed LVRT strategy is verified by simulation model.

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