Method for improving voltage sag tolerance of dual power supply PET based on inter-port power coordination

ZHANG Tengfei

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Method for improving voltage sag tolerance of dual power supply PET based on inter-port power coordination

更新时间：2025-10-16

- Method for improving voltage sag tolerance of dual power supply PET based on inter-port power coordination
- Vol. 44, Issue 1, Pages: 92-103(2025)
- 作者机构：
  
  国网河北省电力有限公司保定供电分公司,河北,保定,071000
- 作者简介：
- 基金信息：
- DOI：
  CLC： TM41
- Published：2025
- 稿件说明：
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ZHANG Tengfei. Method for improving voltage sag tolerance of dual power supply PET based on inter-port power coordination[J]. 2025, 44(1): 92-103.
DOI：

ZHANG Tengfei. Method for improving voltage sag tolerance of dual power supply PET based on inter-port power coordination[J]. 2025, 44(1): 92-103. DOI：

摘要

双电源输入级联型电力电子变压器(dual power supply cascaded-type power electronic transformer

DPSC-PET)与两路供电电源相连，运行可靠性高、方式灵活，在中低压配电网中应用前景广泛，深入研究其电压暂降耐受能力与调节方法，对于维持暂降期间DPSC-PET的高效能量传输、保证系统优质供电具有重要意义。首先，分析DPSC-PET的拓扑与控制策略；其次，针对引起系统传输功率缺额最严重的三相对称电压暂降，分析DPSC-PET暂降耐受能力限制因素；然后，从功率平衡角度出发，提出一种不同输入侧发生暂降时DPSC-PET耐受能力实时分析与双输入端口功率协同调节方法，以实现暂降下低压直流母线电压恢复，提升DPSC-PET应对暂态扰动的能力；最后，搭建DPSC-PET仿真模型，对不同输入侧发生不同程度的电压暂降场景进行仿真。结果表明，所提调节方法能有效提升DPSC-PET的暂降耐受能力。

Abstract

Dual power supply cascaded-type power electronic transformers (DPSC-PET) is connected to two power supplies with high operational reliability and flexible operation mode

and it can be widely used in medium and low voltage distribution networks. It is of great importance to conduct in-depth research on its voltage sag tolerance and regulation method for maintaining efficient energy transmission of DPSC-PET as well as high quality power supply during voltage sag. Firstly

the topological structure and control strategy of DPSC-PET are analyzed. Secondly

the influence factors of voltage sag tolerance of DPSC-PET are analyzed for three-phase symmetrical voltage sag which has the most serious power shortage. Then

from the perspective of power balance

a real-time analysis method of voltage sag immunity of DPSC-PET as well as power coordination method between dual input ports when voltage sag occurs on different power supply are proposed to achieve a perfect recovery of low-voltage DC bus voltage

which means the significant improvement of DPSC-PET to cope with transient disturbances. Finally

the simulation model of DPSC-PET is established and the simulations for voltage sag occurred with different magnitudes on different power supply are cited out. The results show that the voltage sag tolerance of DPSC-PET is significantly improved with the proposed method.

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