摘要
大功率电能变换领域中,模块化多电平换流器(modular multilevel converter,MMC)应用广泛,其通常采用级联式比例积分(proportional integral,PI)控制,等效为典型Ⅱ型系统,难以兼顾动态性能和抗扰性能,且高压直流侧存在显著的能量非线性问题。针对上述问题,文中提出一种MMC全状态反馈控制(full-state feedback control,FSFC)策略,基于能量角度构建MMC线性化模型,引入全状态变量反馈,将变流器系统降阶为典型Ⅰ型系统,在快速响应的同时提高系统抗扰性能,改善阻尼特性,且在直流侧电压控制中实现能量线性化。论文推导FSFC的结构框图,确定阻尼特性最优时的状态反馈增益系数,对比分析全状态反馈和级联式PI的控制特性。研究结果表明:与PI控制和模型预测控制相比,FSFC策略在动态响应、直流负载突变、电网电压跌落等方面优势显著。最后,搭建仿真与实验样机,验证所提FSFC的有效性和优越性。
Modular multilevel converter(MMC)is widely utilized in the field of high power conversion.It usually adopts cascaded proportional-integral(PI)control,which is equivalent to a typeⅡsystem.It is difficult to consider the dynamic performance and disturbance suppression,and there is a significant energy nonlinearity problem in the high-voltage DC bus.To solve the above problems,this paper proposes a full-state feedback control(FSFC)strategy for MMC,constructs a linearization model for MMC based on the energy perspective,and introduces the full-state variable feedback,which downgrades the model to a typeⅠsystem,improves the system disturbance suppression and damping characteristics while providing a fast response,and realizes the energy linearization in the DC voltage control.The paper derives the block diagram of the full-state feedback control structure,determines the state feedback gain coefficient when the damping characteristics are optimal,and compares and analyses the control characteristics of FSFC and cascaded PI.The results show that the FSFC has significant advantages over PI control and model predictive control(MPC)in terms of dynamic response,DC load step and grid voltage dips.Finally,a time-domain simulation and an experimental prototype are built to verify the effectiveness and superiority of the proposed full-state feedback control.
作者
田艳军
王学成
李兆杰
岳之双
韩璇
徐小奇
TIAN Yanjun;WANG Xuecheng;LI Zhaojie;YUE Zhishuang;HAN Xuan;XU Xiaoqi(Hebei Key Laboratory of Distributed Energy Storage and Micro-grid(North China Electric Power University),Baoding 071003,Hebei Province,China;Anyang Power Supply Company,State Grid Henan Electric Power Company,Anyang 455000,Henan Province,China;Baodi Power Supply Branch,State Grid Tianjin Electric Power Company,Baodi District,Tianjin 301800,China)
出处
《中国电机工程学报》
北大核心
2025年第23期9392-9404,I0026,共14页
PROCEEDINGS OF THE CHINESE SOCIETY FOR ELECTRICAL ENGINEERING
基金
国家重点研发计划项目(2023YFB2406800)
中央高校基本科研业务费专项资金资助(2025MS113)。
关键词
模块化多电平换流器
全状态反馈
能量线性化
降阶控制
扰动抑制
modular multilevel converter(MMC)
full-state feedback
energy linearization
reduced order control
disturbance suppression
