储能型模块化多电平换流器的桥臂级平均值模型及运行特性分析

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储能型模块化多电平换流器的桥臂级平均值模型及运行特性分析

更新时间：2025-10-29

- 储能型模块化多电平换流器的桥臂级平均值模型及运行特性分析
- Issue 4, Pages: 33-43(2025)
- 作者机构：
  
  河北省分布式储能与微网重点实验室(华北电力大学)
- 作者简介：
- 基金信息：
- DOI：
  CLC： TM721.1
- Published：2025
- 稿件说明：
移动端阅览
[J]. 2025, (4): 33-43.
DOI：

[J]. 2025, (4): 33-43. DOI：

摘要

为了研究模块化多电平换流器(modular multilevel converter

MMC)在嵌入储能系统(battery energy storage system

BESS)后内部动态特性的变化规律，对MMC-BESS的运行特性进行了详细分析，并提出了一种桥臂级平均值模型(arm average model

AAM)进行验证。首先，在假设桥臂中各储能子模块状态一致的前提下，将离散环节连续化，并根据电路特性方程构建了MMC-BESS的AAM电路模型。然后，根据交流端、直流端以及储能端之间的功率关系对MMC-BESS的运行模式进行划分，建立了桥臂电流与电池功率之间的关系，并对电池功率不均衡状态下的桥臂电流进行了分析。最后，利用Matlab/Simulink分别搭建了MMC-BESS的开关模型和AAM模型，并基于AAM验证了多种工况下的桥臂电流响应。仿真结果表明，AAM在显著提高仿真效率的同时可保证较高的准确性，电池功率的大小与均衡状况对桥臂电流的成分有较大影响。

Abstract

In order to investigate the variations in the internal dynamic characteristics of modular multilevel converter(MMC) after integrating a battery energy storage system(BESS)

we analyze the operation characteristics of MMC-BESS in detail

and propose an arm average model(AAM) for verification. Firstly

under the assumption that the states of all energy storage submodules within each arm are consistent

we transform the discrete components into continuous ones. We construct the AAM circuit model of MMC-BESS based on the circuit characteristic equations. Secondly

we categorize the operational modes of MMC-BESS according to the power relationships between the AC side

DC side

and energy storage side. Then

we establish the relationship between arm currents and battery power

and conduct an analysis of arm currents under battery power imbalance. Finally

we build the switch model and AAM model of MMC-BESS respectively by Matlab/Simulink

and verify the arm current response under various working conditions based on AAM. The simulation results show that AAM can significantly improve the simulation efficiency and ensure high accuracy

and the battery power and balance have a great influence on the components of the bridge arm current.

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