首页|引入自抗扰控制的MMC均压环流简化控制策略

引入自抗扰控制的MMC均压环流简化控制策略

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针对模块化多电平换流器(MMC)正常工作时,子模块电容电压不平衡和三相桥臂间存在环流分量的问题,通过引入自抗扰控制,提出一种新的均压环流控制策略.分析子模块电容电压波动以及环流机理,提出基于自抗扰控制的单环子模块均压控制;结合二阶广义积分器滤波环节提取交流分量,使用准PR控制对环流二倍频分量进行抑制.在稳态、动态条件下进行实验,结果表明:在稳态条件下,基于ADRC的单环控制波动系数降低0.5％,环流抑制降低19％,输出电流畸变率降低0.46％;在动态条件下,可以快速达到新的稳定状态,对电容电压脉动有良好的抑制作用.
Simplified control strategy for MMC voltage balancing circulation base on active disturbance rejection control
To address the problem of unbalanced capacitor voltage of sub-module and circulating current component between three-phase bridge arms during the operation of MMC, this paper proposes a new equalizing circulating current control strategy by introducing active disturbance rejection control.First, the sub-module capacitor voltage fluctuation and the circulating current mechanism are analyzed.Then, the single-loop sub-module voltage equalization control based on active disturbance rejection control is proposed.Second, the AC component is extracted by combining the second-order generalized integrator filtering link, and the circulating current doubling component is suppressed by quasi-PR control.Finally, experimental verification is conducted under steady state and dynamic conditions.Our results show under steady state conditions, the ADRC-based single-loop control reduces the fluctuation coefficient by 0.5％, the circulating current suppression by 19％, and the output current distortion rate by 0.46％; and under dynamic conditions, it reaches the new stabilization faster and effectively suppresses capacitor voltage pulsation.

modular multilevel convertercapacitor voltage balancingactive disturbance rejection controlcirculating current suppressing controlsecond-order generalized integrator

刘述喜、曲雨霏、罗钦、刘科、王乾蕴

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重庆理工大学 电气与电子工程学院,重庆 400054

重庆市能源互联网工程技术研究中心,重庆 400054

模块化多电平换流器 电容电压均衡 自抗扰控制 环流抑制 二阶广义积分器

重庆市教委科学技术研究计划

KJQN202001128

2024

10.3969/j.issn.1674-8425(z).2024.04.033

重庆理工大学学报
重庆理工大学

重庆理工大学学报

CSTPCD北大核心
影响因子：0.567
ISSN：1674-8425
年,卷(期)：2024.38(7)
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