基于谐波状态空间的MMC小信号阻抗建模  

Harmonic State Space Based Small-signal Impedance Modeling of MMC

作　　者：熊盛涛 刘振兴[1] 廖雪超[1] 李群桥 XIONG Sheng-tao;LIU Zhen-xing;LIAO Xue-chao;LI Qun-qiao(Wuhan University of Science and Technology,Wuhan 430081,China;不详)

机构地区：[1]武汉科技大学,湖北武汉430081 [2]武汉城市学院,湖北武汉430083 [3]武钢有限条材厂,湖北武汉430083

出　　处：《电力电子技术》2021年第11期88-92,共5页Power Electronics

基　　金：国家自然科学基金(51377044)。

摘　　要：模块化多电平变换器(MMC)的小信号阻抗建模是分析基于MMC的电力电子系统谐振和稳定性的关键。针对MMC阻抗建模中不能全面考虑桥臂电流和电容电压中稳态谐波分量的影响问题,引入谐波状态空间(HSS)建模方法来描述多谐波耦合特性。首先对基于HSS的MMC模型进行了介绍。随后在提出的MMC HSS模型的基础上,建立了 MMC的小信号阻抗模型,该模型能够包含MMC内部的所有谐波,并全面考虑了交流电压闭环控制方案对其影响。提出的模型揭示了 MMC内部动态特性和控制动态特性对MMC阻抗的影响。最后,通过仿真和实验对所提出的阻抗模型进行了验证。The small-signal impedance modeling of modular multilevel converter(MMC) is the key for analyzing resonance and stability of MMC-based power electronic systems.Aiming at the problem that the significant steady-state harmonic components in the arm currents and capacitor voltages are not considered in the impedance modeling of MMC,the harmonic state space(HSS) modeling approach is first introduced to characterize the multi-harmonic coupling behavior of the MMC.Firstly,the MMC model based on HSS is introduced.Then,the small-signal impedance models of the MMC are then developed based on MMC HSS,which are able to include all the internal harmonics within MMC.Besides,different control schemes for the MMC,such as open-loop control,alternating current voltage closedloop control,and circulating current closed-loop control,have also been considered during the modeling process,which further reveal the impact of the MMC internal dynamic characteristics and control dynamic characteristics on the MMC impedance.Finally,the proposed impedance models are validated by both simulation and experiment.

关 键 词：模块化多电平变换器 阻抗 谐波状态空间 动态特性 

分 类 号：TM46[电气工程—电器]