非理想条件下基于MMC的电力电子变压器的无源滑模控制策略  

Passivity-based Sliding-mode Control Strategy for Power Electronic Transformer Based on MMC Under Non-ideal Conditions

作　　者：程启明 李剑辉 赖宇生 张昕 陈颖 沈章平 CHENG Qiming;LI Jianhui;LAI Yusheng;ZHANG Xin;CHEN Ying;SHEN Zhangping(Shanghai Key Laboratory Power Station Automation Technology Laboratory,College of Automation Engineering,Shanghai University of Electric Power,Shanghai 200090,China)

机构地区：[1]上海市电站自动化技术重点实验室(上海电力大学自动化工程学院),上海200090

出　　处：《高电压技术》2023年第4期1556-1566,共11页High Voltage Engineering

基　　金：国家自然科学基金(61905139);上海市电站自动化技术重点实验室资助项目(13DZ2273800)。

摘　　要：基于模块化多电平换流器(modularmultilevelconverter,MMC)的电力电子变压器(powerelectronictransformers,PET)在输配电过程中发生扰动时,采用传统的PI控制、无源控制等已经难以保证系统的可靠性以及良好的动态响应能力。为了改善非理想条件下系统的可靠性和动态响应,提出基于MMC-PET的无源滑模控制(passivity-basedcontrol–sliding-modecontrol,PBC-SMC)策略。首先,将基于MMC的欧拉-拉格朗日(Euler-Lagrange,EL)模型的无源控制器应用到内环电流控制,再引入滑模控制(sliding-mode control,SMC),可有效解决无源控制过于依赖系统参数的问题,使得控制系统具有更强的抗干扰能力和更快的响应速度;然后,通过移相均压控制来稳定中间隔离级的输出直流电压,并设计输出级逆变器的无源控制器;最后,搭建MMC-PET仿真系统进行实验验证,结果表明在非理想条件下MMC-PET采用PBC-SMC控制方法的有效性和优越性。Power electronic transformer(PET)is widely used in power transmission and distribution system due to the advantages of small volume,harmonic control,power control,and electrical isolation.The combination of modular multilevel converter(MMC)and PET can solve the problem of power quality effectively in medium-and high-voltage distribution network.However,there are many unexpected interference factors in the transmission and distribution process,which lead to system instability and affect the power quality of transmission and distribution.In order to improve the reliability and dynamic response of the system under non-ideal conditions,the passivity-based control-sliding-mode control(PBC-SMC)based on MMC-PET is proposed.Firstly,the PBC controller based on Euler-Lagrange(EL)model of MMC is applied to the inner loop current control,and then the sliding mode control is introduced,which can effectively solve the problem that PBC control is excessively dependent on system parameters,so that the control system has stronger anti-interference ability and faster response speed.The output DC voltage of intermediate isolation stage is stabilized by phase shift voltage regulation control,and the PBC controller of output stage inverter is designed.Finally,the MMC-PET simulation system is built for experimental verification.The results show that the PBC-SMC control method of MMC-PET is effective and superior under non-ideal conditions.

关 键 词：电力电子变压器 模块化多电平换流器 非理想条件 内环电流控制 无源滑模控制 

分 类 号：TM41[电气工程—电器] TP273[自动化与计算机技术—检测技术与自动化装置]