基于Dual-PCHD模型的电网不平衡下MMC无源性控制方法  

Passivity-based Control Method with Dual-PCHD Model of MMC Under Unbalanced Grid

作　　者：田广平 薛花 TIAN Guangping;XUE Hua(School of Electrical Engineering,Shanghai University of Electric Power,Shanghai 200090,China)

机构地区：[1]上海电力大学电气工程学院,上海200090

出　　处：《电气传动》2022年第22期21-26,共6页Electric Drive

基　　金：国家自然科学基金(51407114);上海市科技创新行动计划项目(19DZ2204700);上海市科委地方能力建设计划(16020500900)。

摘　　要：针对模块化多电平变换器(MMC)在电网发生单相短路时的稳定运行需求,提出基于双端口受控耗散哈密顿系统(Dual-PCHD)模型的无源性控制方法。设计交互矩阵,建立电网不平衡情形下MMC的DualPCHD模型,使并网正序电流与负序电流子系统具有同步渐进跟踪特性;从能量角度出发,设计全局能量函数,求取无源性控制律,实现负序电流快速抑制与正序电流期望轨迹快速跟踪目标同步达成的同时,确保系统的全局渐进稳定性。基于Matlab/Simulink的仿真结果表明:所提无源性控制方法在电网发生单相短路与有功功率变化、系统参数摄动同时发生时具有优动态性能、宽稳定域和强鲁棒性。In response to the stable operation demand of modular multilevel converter(MMC)with singlephase short circuit fault,a passivity-based method based on dual-port controlled Hamiltonian with dissipation(DualPCHD)model was proposed.To make the grid-connected positive sequence and negative sequence current subsystems have synchronous and progressive tracking characteristics,the Dual-PCHD model of MMC under unbalanced grid was established and the interconnection matrix of current subsystems was designed.From the energy point of view,the global energy function was designed to obtain passivity-based control law.The fast suppression of the negative sequence current and the asymptotic tracking of the desired trajectory of the positive sequence current were achieved.At the same time,the global and gradual stability of the closed control system was guaranteed.It is shown by the simulation results based on Matlab/Simulink that the proposed method has the advantages of good dynamic performance,wide stability range and strong robustness when the single-phase short circuit fault,active power mutation and internal bridge arm resistance parameter perturbation occurring at the same time.

关 键 词：模块化多电平变换器 Dual-PCHD模型 无源性控制 正序电流渐进跟踪 负序电流快速抑制 

分 类 号：TM28[一般工业技术—材料科学与工程]