非理想条件下MMC-PET输入级的Lyapunov控制策略  

Research on Lyapunov Control Strategy for Input Stage of MMC-PET under Non ideal Conditions

作　　者：夏文豪 周建萍 李金洪 龚益琳 XIA Wenhao;ZHOU Jianping;LI Jinhong;GONG Yilin(College of Automation Engineering,Shanghai University of Electric Power,Shanghai 200090,China)

机构地区：[1]上海电力大学自动化工程学院,上海200090

出　　处：《流体测量与控制》2025年第2期1-8,共8页Fluid Measurement & Control

基　　金：国家自然科学基金资助项目(61905139);上海市“科技创新行动计划”地方院校能力建设专项(19020500700)。

摘　　要：电力电子变压器(PET)结合模块化多电平换流器(MMC)而形成的MMC-PET,适用于高电压、大容量的输配电系统。在非理想条件下采用PI等线性控制方法存在电流谐波高、响应速度慢、参数选取复杂等问题。针对这一情况,提出了基于MMC-PET输入级的Lyapunov非线性函数控制策略。首先,对不平衡电网下的MMCPET输入级进行数学建模;接着,对其电气量进行正负序分离;然后,将Lyapunov函数控制用于不平衡电网下MMC-PET的电能质量补偿,并证明了Lyapunov函数控制系统的稳定性,确定了其控制增益的稳定范围;最后,在三相暂降、单相暂升和谐波注入三种工况下,通过仿真系统平台上对Lyapunov函数控制和PI控制进行仿真实验比较。结果表明,在非理想条件下MMC-PET采用Lyapunov控制策略具有有效性和优越性。Power electronic transformer(PET)combined with modular multilevel converter(MMC)MMC-PET is suitable for high voltage,large capacity transmission and distribution system.There are some problems such as high current harmonics,slow response speed and complicated parameter selection in linear control methods such as PI under non-ideal conditions.To solve this problem,a Lyapunov nonlinear function control strategy based on MMC-PET input stage is proposed.Firstly,the mathematical modeling of MMC-PET input stage in unbalanced power network is carried out.Then,positive and negative sequence separation of electrical volume was carried out.Then,Lyapunov function control is used to compensate the power quality of MMC-PET in unbalanced power grid,and the stability of Lyapunov function control system is proved,and the stability range of its control gain is determined.Finally,under three conditions of three-phase temporary drop,single-phase temporary rise and harmonic injection,the simulation experiments of Lyapunov function control and PI control are compared on the simulation system platform,and the results show that the Lyapunov control strategy is effective and superior in MMC-PET under non-ideal conditions.

关 键 词：不平衡电网电压 电力电子变压器 模块化多电平换流器 Lyapunov函数控制 PI控制 

分 类 号：TM461[电气工程—电器]