如何在独立轮转向架上进行左右车轮耦合以提高导向能力,并降低牵引损耗以便提升牵引效率,是100%低地板新型有轨电车的技术难点和研究热点…。建立一种考虑铁耗的内置式永磁同步电机最小损耗求解模型,并采用自适应模糊控制器解决多电机...如何在独立轮转向架上进行左右车轮耦合以提高导向能力,并降低牵引损耗以便提升牵引效率,是100%低地板新型有轨电车的技术难点和研究热点…。建立一种考虑铁耗的内置式永磁同步电机最小损耗求解模型,并采用自适应模糊控制器解决多电机联合控制时的效率寻优问题。使用一种集成效率优化策略,在牵引系统启动阶段,采用最低损耗控制策略(lowest loss control,LLC)进行单电机效率优化控制;在牵引系统恒速稳定运行时,基于最小输入功率的模糊控制开始介入,对基于GPS速差前馈的多电机牵引系统进行整体效率优化。仿真结果表明,与传统的基于单电机MTPA控制相比,集成效率优化策略具有响应速度快、超调量小、鲁棒性好等优点,尤其是能明显降低永磁牵引系统电气损耗。展开更多
Magnetic-valve controllable reactor(MCR)has characteristics of DC bias and different types of magnetic flux density in the magnetic circuit and winding current distortion.These characteristics not only lead to loss ca...Magnetic-valve controllable reactor(MCR)has characteristics of DC bias and different types of magnetic flux density in the magnetic circuit and winding current distortion.These characteristics not only lead to loss calculation method of MCR different from that of power transformer,but also make it more difficult to calculate the core loss and wingding loss of MCR accurately.Our study combines core partition method with dynamic inverse J-A model to calculate the core loss of MCR.The winding loss coefficient of MCR is proposed,which takes into account the influence of harmonics and magnetic flux leakage on the winding loss of MCR.The result shows that the proposed core loss calculation method and winding loss coefficient are effective and correct for the loss calculation of MCR.展开更多
An optimization model for iron-making system covering sinter matching process to blast furnace process is established, in which the energy consumption, CO_2 emission and cost minimizations are taken as optimization ob...An optimization model for iron-making system covering sinter matching process to blast furnace process is established, in which the energy consumption, CO_2 emission and cost minimizations are taken as optimization objectives. Some key constraints are considered according to practical production experience in the modelling. The combination of linear programming(LP)and nonlinear programming(NLP) methods is applied. The optimal sinter matching scheme under given conditions and the optimization results for different objectives are obtained. Effects of sinter grade and basicity on all the optimal objectives and coke ratio in blast furnace process are analyzed, respectively. The results obtained indicate that compared with the initial values,the energy consumption/CO_2 emission of iron-making system decreases by 2.03% for objectives of energy consumption/CO_2 emission minimizations and 1.89% for the objective of cost minimization, the cost decreases by 17.88% and 18.13%, respectively.All the three criteria decrease with the increasing lump usage, coal powder injection, blast temperature, and decreasing coke ratio for the iron-making system.展开更多
文摘如何在独立轮转向架上进行左右车轮耦合以提高导向能力,并降低牵引损耗以便提升牵引效率,是100%低地板新型有轨电车的技术难点和研究热点…。建立一种考虑铁耗的内置式永磁同步电机最小损耗求解模型,并采用自适应模糊控制器解决多电机联合控制时的效率寻优问题。使用一种集成效率优化策略,在牵引系统启动阶段,采用最低损耗控制策略(lowest loss control,LLC)进行单电机效率优化控制;在牵引系统恒速稳定运行时,基于最小输入功率的模糊控制开始介入,对基于GPS速差前馈的多电机牵引系统进行整体效率优化。仿真结果表明,与传统的基于单电机MTPA控制相比,集成效率优化策略具有响应速度快、超调量小、鲁棒性好等优点,尤其是能明显降低永磁牵引系统电气损耗。
基金National Natural Science Foundation of China(No.51367010)Science and Technology Program of Gansu Province(No.17JR5RA083)Program for Excellent Team of Scientific Research in Lanzhou Jiaotong University(No.201701)。
文摘Magnetic-valve controllable reactor(MCR)has characteristics of DC bias and different types of magnetic flux density in the magnetic circuit and winding current distortion.These characteristics not only lead to loss calculation method of MCR different from that of power transformer,but also make it more difficult to calculate the core loss and wingding loss of MCR accurately.Our study combines core partition method with dynamic inverse J-A model to calculate the core loss of MCR.The winding loss coefficient of MCR is proposed,which takes into account the influence of harmonics and magnetic flux leakage on the winding loss of MCR.The result shows that the proposed core loss calculation method and winding loss coefficient are effective and correct for the loss calculation of MCR.
基金supported by the National Key Basic Research and Development Program of China(Grant No.2012CB720405)the Natural Science Foundation of Naval University of Engineering(Grant No.HG DYDJJ-13002)
文摘An optimization model for iron-making system covering sinter matching process to blast furnace process is established, in which the energy consumption, CO_2 emission and cost minimizations are taken as optimization objectives. Some key constraints are considered according to practical production experience in the modelling. The combination of linear programming(LP)and nonlinear programming(NLP) methods is applied. The optimal sinter matching scheme under given conditions and the optimization results for different objectives are obtained. Effects of sinter grade and basicity on all the optimal objectives and coke ratio in blast furnace process are analyzed, respectively. The results obtained indicate that compared with the initial values,the energy consumption/CO_2 emission of iron-making system decreases by 2.03% for objectives of energy consumption/CO_2 emission minimizations and 1.89% for the objective of cost minimization, the cost decreases by 17.88% and 18.13%, respectively.All the three criteria decrease with the increasing lump usage, coal powder injection, blast temperature, and decreasing coke ratio for the iron-making system.
