摘要
针对模块化多电平变换器的相间环流与子模块电压波动问题,提出了基于附加电平模型预测控制的环流抑制策略,利用附加的补偿电平实现总子模块数的实时更新,达到环流抑制目的;同时,将相间均压与相内子模块均衡作为子模块的第一重均压控制,再将所投入的子模块电压排序处理构成第二重均压控制。通过分析模块化多电平变换器的桥臂环流与桥臂电压之间的关系以及子模块电压波动的弊端,提出了环流抑制与子模块均压控制策略。最后,在Matlab/Simulink中搭建了31电平的模块化多电平变换器系统仿真模型,验证了所提策略的可行性与有效性。
Targeting the problem of phase-to--phase circulating current and submodule voltage fluctuation of modular multilevel converter(MMC),the paper proposes a circulating current suppression strategy based on additional level model predictive control(MPC).The additional compensation level is used to update the total number of the submodules in real time,so as to suppress the circulating current.At the same time,the phase voltage balancing and submodule equalization are used as the first voltage balancing control of the submodules,and then the voltage of the input submodules is sorted to obtain the second voltage balancing control.By analyzing the relationship between the bridge arm circulating current and bridge arm voltage of MMC as well as the effects of voltage fluctuation of the submodules,the strategy for the circulating current suppression and voltage balancing control of the submodules is proposed.Finally,a 31-level MMC system simulation model is built in Matlab/Simulink,and the results verify the feasibility and effectiveness of the proposed strategy.
作者
赵伟
袁至
王维庆
何山
ZHAO Wei;YUAN Zhi;WANG Weiqing;HE Shan(Engineering Research Center of Renewable Energy Generation and Grid-connected Control,Ministry of Education,Xinjiang University,Urumqi 830017,China)
出处
《智慧电力》
北大核心
2022年第3期57-64,共8页
Smart Power
基金
国家自然科学基金资助项目(52067020,51767024)。
