Interphase Power Equalization Control Strategy for MMC Energy Storage System Based on DC Circulating Current Injection

被引：0

作者：

Wang S. ^{[1
]}

Jing L. ^{[1
]}

Wu X. ^{[2
]}

Li J. ^{[1
]}

Wu W. ^{[2
]}

Wang X. ^{[2
]}

Yang H. ^{[1
]}

机构：

[1] National Active Distribution Network Technology Research Center, Beijing Jiaotong University, Haidian District, Beijing

[2] Collaborative Innovation Center of Electric Vehicles in Beijing, Beijing Jiaotong University, Haidian District, Beijing

来源：

| 1600年 / Power System Technology Press卷 / 41期

关键词：

AC system asymmetry; Circulating current; Energy storage system; MMC;

D O I：

10.13335/j.1000-3673.pst.2017.0021

中图分类号：

学科分类号：

摘要：

Control objective of AC current balance for converters can maintain a safe and stable state under unbalanced voltage. However, it causes difference of power and inconsistency of state of charge (SOC). Firstly, operation principle and circulating characteristics of modular multilevel converter (MMC) and modular multilevel converter energy storage system (MMC-ESS) are compared and analyzed in this paper. The battery SOC is analyzed through instantaneous power of sub-modules in upper and lower arms of the converters in different phases. Then, a power balance control strategy of DC circulating current injection is proposed. Influence of DC loop controller parameters on system is discussed. Based on voltage drop in each phase, 3D plots of DC circulating currents are drawn. The standard parameters of the devices are given by arm current deviation for each phase under different unbalanced voltage. A MMC-ESS simulation model is set up on Simulink to verify effectiveness of the proposed control strategy and experimental results are presented. © 2017, Power System Technology Press. All right reserved.

引用

页码：2862 / 2869

页数：7

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