针对基于NPC型三电平变换器的永磁直驱风力发电系统存在的直流侧电容中性点电位不平衡问题继续研究。根据NPC型三电平变换器的特点,采用简化SVPWM调制算法,采用实时电流监测(Real-time Current Detection,RCD)电位平衡控制策略,结合机...针对基于NPC型三电平变换器的永磁直驱风力发电系统存在的直流侧电容中性点电位不平衡问题继续研究。根据NPC型三电平变换器的特点,采用简化SVPWM调制算法,采用实时电流监测(Real-time Current Detection,RCD)电位平衡控制策略,结合机侧变换器、网侧变换器所采用转子磁场定向控制策略和电网电压定向控制策略,建立了三电平永磁风力发电系统变换器控制策略,在实现最大风能跟踪、有功无功解耦控制的同时抑制了中性点电位不平衡。基于MATLAB/Simulink仿真环境搭建系统模型,通过仿真验证控制策略的可行性和正确性。展开更多
This paper offers a variant of a proof of a borderline Bourgain-Brezis Sobolev embedding theorem on R^n. The authors use this idea to extend the result to real hyperbolic spaces H^n.
文摘针对基于NPC型三电平变换器的永磁直驱风力发电系统存在的直流侧电容中性点电位不平衡问题继续研究。根据NPC型三电平变换器的特点,采用简化SVPWM调制算法,采用实时电流监测(Real-time Current Detection,RCD)电位平衡控制策略,结合机侧变换器、网侧变换器所采用转子磁场定向控制策略和电网电压定向控制策略,建立了三电平永磁风力发电系统变换器控制策略,在实现最大风能跟踪、有功无功解耦控制的同时抑制了中性点电位不平衡。基于MATLAB/Simulink仿真环境搭建系统模型,通过仿真验证控制策略的可行性和正确性。
基金S.Chanillo was partially supported by NSF grant DMS 1201474J.Van Schaftingen was partially supported by the Fonds de la Recherche Scientifique-FNRS+3 种基金P.-L.Yung was partially supported by a Titchmarsh Fellowship at the University of Oxforda junior research fellowship at St.Hilda’s Collegea direct grant for research from the Chinese University of Hong Kong(3132713)an Early Career Grant CUHK24300915 from the Hong Kong Research Grant Council
文摘This paper offers a variant of a proof of a borderline Bourgain-Brezis Sobolev embedding theorem on R^n. The authors use this idea to extend the result to real hyperbolic spaces H^n.