Unified Impedance Modeling Method of Cascaded DC Transformer Based Boost+LLC

LIU Chuang; Lü Ying; ZHU Di; GUO Dongbo; PEI Zhongchen; YUAN Yubo

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Unified Impedance Modeling Method of Cascaded DC Transformer Based Boost+LLC

更新时间：2025-12-08

- Unified Impedance Modeling Method of Cascaded DC Transformer Based Boost+LLC
- Vol. 46, Issue 7, Pages: 2278-2286(2020)
- 作者机构：
  
  1. 东北电力大学电气工程学院
  2. 国网江苏省电力有限公司
- 作者简介：
- 基金信息：
- DOI：
  CLC：
- Published Online：31 July 2020，
  
  Published：2020
- 稿件说明：
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LIU Chuang, Lü Ying, ZHU Di, et al. Unified Impedance Modeling Method of Cascaded DC Transformer Based Boost+LLC[J]. 2020, 46(7): 2278-2286.
DOI：

LIU Chuang, Lü Ying, ZHU Di, et al. Unified Impedance Modeling Method of Cascaded DC Transformer Based Boost+LLC[J]. 2020, 46(7): 2278-2286. DOI：

摘要

为了解决双级式直流变压器阻抗模型的构建问题

提出了一种基于输入串联输出并联连接的级联型直流变压器统一阻抗建模方法。首先介绍了Boost+LLC级联型直流变压器的拓扑

该拓扑具有以下优势:既弥补了Boost变换器的非隔离特性

又弥补了LLC谐振变换器窄范围电压调节的特性;其次

结合LLC谐振变换器近似谐振点工作模式下恒定增益的电压钳位功能

将Boost+LLC级联型直流变压器的双级协调控制合并为单级统一控制;在此基础上

结合基波近似法下LLC谐振变换器的降阶小信号模型

推导出Boost+LLC型双级式直流变压器的系统模型

进而推导出了其低压侧阻抗模型。最后

在MATLAB/Simulink中搭建了Boost+LLC的仿真模型

验证了建模方法的正确性

为直流网稳定性分析提供了理论基础。

Abstract

In order to solve the problem of building two-stage DC transformer impedance model

we propose a unified impedance modeling method for cascaded DC transformers based on input-series-output-parallel connection. Firstly

the topology of the Boost + LLC cascaded DC transformer is introduced. This topology has the following advantages: it not only makes up for the non-isolation characteristics of the Boost converter

but also compensates for the narrow-range voltage regulation characteristics of the LLC resonant converter. Secondly

combined with the constant gain voltage clamping function of LLC resonant converter under the operating mode of approximate resonance point

the two-stage coordinated control strategy of Boost + LLC cascaded DC transformers is merged into the single-stage unified control strategy; based on this

combined with the reduced-order small-signal model of the LLC resonant converter under the fundamental wave approximation method

the system model of the Boost + LLC two-stage DC transformer is established

and the low-voltage side impedance model is derived. Finally

a simulation model of Boost + LLC is established in MATLAB/Simulink. Simulation results have verified the correctness of the modeling method

providing a theoretical basis for the stability analysis of the DC network.

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