Research on AC Asymmetrical Fault Control Strategy AC/AC System Based on Hexverter

ZHANG Chong; ZHANG Jianan; ZHANG Di; LIU Panpan

doi:10.14044/j.1674-1757.pcrpc.2024.03.013

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Research on AC Asymmetrical Fault Control Strategy AC/AC System Based on Hexverter

Research on System Application | 更新时间：2024-09-14

- Research on AC Asymmetrical Fault Control Strategy AC/AC System Based on Hexverter
- Power Capacitor & Reactive Power Compensation Vol. 45, Issue 3, Pages: 98-105(2024)
- 作者机构：
  
  先进输电技术国家重点实验室（国网智能电网研究院有限公司），北京　 102200
- 作者简介：
- 基金信息：
- DOI：10.14044/j.1674-1757.pcrpc.2024.03.013
  CLC：
- Published：2024-06，
  
  Received：27 October 2023，
- 稿件说明：
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ZHANG CHONG, ZHANG JIANAN, ZHANG DI, et al. Research on AC Asymmetrical Fault Control Strategy AC/AC System Based on Hexverter. [J]. Power capacitor & reactive power compensation, 2024, 45(3): 98-105.
DOI：

ZHANG CHONG, ZHANG JIANAN, ZHANG DI, et al. Research on AC Asymmetrical Fault Control Strategy AC/AC System Based on Hexverter. [J]. Power capacitor & reactive power compensation, 2024, 45(3): 98-105. DOI： 10.14044/j.1674-1757.pcrpc.2024.03.013.

摘要

六边形模块化多电平换流器（hexagonal modular multilevel converter，Hexverter）作为一种新型的AC/AC功率变换器，在未来海上风电场并网及低频输电技术中有着广阔的应用前景。为了解决Hexverter在电力系统不对称故障工况的稳定运行，文章首先对Hexverter的拓扑结构和工作原理简要介绍，并对其支路电流、支路功率进行分析。然后，研究其AC/AC系统交流侧不对称故障工况下的控制策略，基于理论推导部分得出的Hexverter六个支路间功率分布的规律（即不相邻的三个支路功率分别相等的特征），设计了子模块电容电压均衡控制方法，共包含两部分控制，分别为六个支路间子模块电容电压均衡控制和每个支路内部

个子模块电容电压之间的均衡控制。考虑到支路电流含有两侧交流系统不同频率成分，基于比例谐振控制器，提出了一种对支路电流直接进行控制的方法。最后，通过算例中稳态工况与故障工况研究分别对其工作原理和文中所提出的控制策略有效性进行验证。结果表明，在二次侧交流系统发生BC相短路故障期间，整个系统保持稳定运行，各个子模块电压始终保持均衡，仿真结果验证了文中所提控制策略的有效性。

Abstract

Hexagonal modular multilevel converter

as a new type of AC/AC power converter

has broad application prospects in grid connection of offshore wind farms in the future and low-frequency transmission technology. For achieving the stable operation of the Hexverter in asymmetrical condition of the power system

the topological structure and working principle of the Hexverter are simply introduced at first in this paper

and its branch current and branch power are analyzed. Then

the control strategy of the AC side of AC/AC system under the asymmetrical condition is studied

the power distribution among six branches of Hexverter is obtained on the basis of theoretical derivation（i.e.

feature of equal power of three branches that are not adjacent）

the method of sub-module voltage balancing control

consisting of capacitive voltage balancing control among six sub-modules and the balancing control among capacitive voltage of n pieces of sub-modules

is designed. Considering that the branch currents contain different frequency components of AC systems on both sides

a branch current control method based on proportional resonance controller is proposed. Finally

its working principle and the effectiveness of the control strategy proposed in this paper are verified at the steady and faulty condition of the example. The results show that in case of short circuit fault of phase B and C at the AC system of the secondary side

the whole system maintains stable operation

the voltage of each sub-module always remains balanced and the effectiveness of the control strategy proposed in this paper is verified by the simulation result.

关键词

交流不对称故障比例谐振模块化多电平换流器环流子模块电压均衡

Keywords

AC asymmetrical faultproportional resonancemodular multilevel converterloop currentsub-module voltage equalization

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