Methods based on numerical optimization are useful and effective in the design of control systems. This paper describes the design of retarded fractional delay differential systems （RFDDSs） by the method of inequali...Methods based on numerical optimization are useful and effective in the design of control systems. This paper describes the design of retarded fractional delay differential systems （RFDDSs） by the method of inequalities, in which the design problem is formulated so that it is suitable for solution by numerical methods. Zakian＇s original formulation, which was first proposed in connection with rational systems, is extended to the case of RFDDSs. In making the use of this formulation possible for RFDDSs, the associated stability problems are resolved by using the stability test and the numerical algorithm for computing the abscissa of stability recently developed by the authors. During the design process, the time responses are obtained by a known method for the numerical inversion of Laplace transforms. Two numerical examples are given, where fractional controllers are designed for a time-delay and a heat-conduction plants.展开更多
讨论一种基于叠加原理和自动微分(automatic differentiation,AD)技术的考虑高压直流输电(high voltage direct current,HVDC)系统的内点法最优潮流算法。该方法主要特点为:采用节点功率注入方法对HVDC建模;利用叠加原理处理HVDC使之集...讨论一种基于叠加原理和自动微分(automatic differentiation,AD)技术的考虑高压直流输电(high voltage direct current,HVDC)系统的内点法最优潮流算法。该方法主要特点为:采用节点功率注入方法对HVDC建模;利用叠加原理处理HVDC使之集成到内点法最优潮流中;使用自动微分技术高效计算直流输电系统对内点法中雅可比矩阵和海森矩阵的修正矩阵。该算法只需要对传统内点法最优潮流程序做少量改动即可实现对新设备的支持,提高了程序的可维护性和通用性。多组算例测试与分析表明,该算法保持了传统内点法最优潮流程序的高效性,并可拓展到柔性交流输电设备和其他用户自定义模型。展开更多
为优化市政雨水管网设计流程,提出了将CAD、ArcGIS和Excel软件联用的全流程系统性设计方法。主要内容包括:运用CAD的制图功能和ArcGIS强大的空间分析功能建立雨水管网模型,通过ArcGIS合并关键节点、线段和子汇水面并生成属性表,然后通过...为优化市政雨水管网设计流程,提出了将CAD、ArcGIS和Excel软件联用的全流程系统性设计方法。主要内容包括:运用CAD的制图功能和ArcGIS强大的空间分析功能建立雨水管网模型,通过ArcGIS合并关键节点、线段和子汇水面并生成属性表,然后通过Excel对该表进行相关数学计算,利用Excel中的透视表功能与VBA(Visual Basic for Application)编程结合,实现雨水管段各属性信息的自动计算。通过以上各软件的联合应用实现了城市雨水管网系统的设计,可为雨水设计软件的开发提供参考。展开更多
基金supported by the AUN/SEED-Net collaborative research program.
文摘Methods based on numerical optimization are useful and effective in the design of control systems. This paper describes the design of retarded fractional delay differential systems （RFDDSs） by the method of inequalities, in which the design problem is formulated so that it is suitable for solution by numerical methods. Zakian＇s original formulation, which was first proposed in connection with rational systems, is extended to the case of RFDDSs. In making the use of this formulation possible for RFDDSs, the associated stability problems are resolved by using the stability test and the numerical algorithm for computing the abscissa of stability recently developed by the authors. During the design process, the time responses are obtained by a known method for the numerical inversion of Laplace transforms. Two numerical examples are given, where fractional controllers are designed for a time-delay and a heat-conduction plants.
文摘讨论一种基于叠加原理和自动微分(automatic differentiation,AD)技术的考虑高压直流输电(high voltage direct current,HVDC)系统的内点法最优潮流算法。该方法主要特点为:采用节点功率注入方法对HVDC建模;利用叠加原理处理HVDC使之集成到内点法最优潮流中;使用自动微分技术高效计算直流输电系统对内点法中雅可比矩阵和海森矩阵的修正矩阵。该算法只需要对传统内点法最优潮流程序做少量改动即可实现对新设备的支持,提高了程序的可维护性和通用性。多组算例测试与分析表明,该算法保持了传统内点法最优潮流程序的高效性,并可拓展到柔性交流输电设备和其他用户自定义模型。
文摘为优化市政雨水管网设计流程,提出了将CAD、ArcGIS和Excel软件联用的全流程系统性设计方法。主要内容包括:运用CAD的制图功能和ArcGIS强大的空间分析功能建立雨水管网模型,通过ArcGIS合并关键节点、线段和子汇水面并生成属性表,然后通过Excel对该表进行相关数学计算,利用Excel中的透视表功能与VBA(Visual Basic for Application)编程结合,实现雨水管段各属性信息的自动计算。通过以上各软件的联合应用实现了城市雨水管网系统的设计,可为雨水设计软件的开发提供参考。
