Multithreading has been proposed as an efficient computing model for improving parallelism. It combinesadvantages of both dataflow architecture and von Neumann architecture,leading to high performance and efficiency.T...Multithreading has been proposed as an efficient computing model for improving parallelism. It combinesadvantages of both dataflow architecture and von Neumann architecture,leading to high performance and efficiency.The-state-of-the-art multithreaded computing model includes Blocking thread and Non-blocking thread, the corre-sponded multithreaded architecting can be classified as Multiple Context Processor and Hybrid Architecture. Threadpartitioning is one of the most important compiling issues in multithreaded computing. The idea of multithreading willbe developed further on the move of architecture,compiling technique,and operating system.展开更多
基于多有源桥(multiple active bridge,MAB)的电力电子变压器(power electronic transformer,PET)具有“模块化,大规模,高复杂度”的特点,相比与其他基于双端口功率模块的PET拓扑,其电磁暂态加速仿真面临更大的困难。为提高仿真效率与CP...基于多有源桥(multiple active bridge,MAB)的电力电子变压器(power electronic transformer,PET)具有“模块化,大规模,高复杂度”的特点,相比与其他基于双端口功率模块的PET拓扑,其电磁暂态加速仿真面临更大的困难。为提高仿真效率与CPU利用率,文中提出一种适用于MAB型PET的并行等效建模方法。首先,根据“变压器端口解耦”的思路,建立PET串行等效模型。然后,利用所提等效方法的高度可并行性,给出等效模型多线程并行仿真框架,并进行并行算法评价与影响因素分析。通过PSCAD/EMTDC仿真验证,所提等效模型能够对详细模型进行多工况高度拟合,串行等效模型加速比可达2~3个数量级。在最优并行线程数下,并行等效模型可实现对串行模型2~3倍的二次加速。展开更多
文摘Multithreading has been proposed as an efficient computing model for improving parallelism. It combinesadvantages of both dataflow architecture and von Neumann architecture,leading to high performance and efficiency.The-state-of-the-art multithreaded computing model includes Blocking thread and Non-blocking thread, the corre-sponded multithreaded architecting can be classified as Multiple Context Processor and Hybrid Architecture. Threadpartitioning is one of the most important compiling issues in multithreaded computing. The idea of multithreading willbe developed further on the move of architecture,compiling technique,and operating system.
文摘基于多有源桥(multiple active bridge,MAB)的电力电子变压器(power electronic transformer,PET)具有“模块化,大规模,高复杂度”的特点,相比与其他基于双端口功率模块的PET拓扑,其电磁暂态加速仿真面临更大的困难。为提高仿真效率与CPU利用率,文中提出一种适用于MAB型PET的并行等效建模方法。首先,根据“变压器端口解耦”的思路,建立PET串行等效模型。然后,利用所提等效方法的高度可并行性,给出等效模型多线程并行仿真框架,并进行并行算法评价与影响因素分析。通过PSCAD/EMTDC仿真验证,所提等效模型能够对详细模型进行多工况高度拟合,串行等效模型加速比可达2~3个数量级。在最优并行线程数下,并行等效模型可实现对串行模型2~3倍的二次加速。
文摘电力电子变压器(power electronic transformer,PET)具有模块化、多节点、频率高的特点,其详细模型的电磁暂态仿真(electromagnetic transient,EMT)效率低下,仿真提速需求迫切。从模型自身提速与提高CPU计算效率两方面入手,提出了PET电磁暂态并行仿真等效建模方法,并以级联H桥型PET(cascaded H-bridge type power electronic transformer,CHB-PET)为例进行了理论推导与仿真验证。首先,以导纳是否可定为标准,将功率模块(power module,PM)划分为不同导纳单元电路的组合;其次,从有载二端口的角度出发,推导出H桥单元对外仅含2种等效导纳,可简化为二值导纳单元;将各单元的导纳参数预存,利用叠加定理求取端口短路电流,即可快速获取PM诺顿等效电路参数,聚合形成CHB-PET串行等效模型;最后,结合该模型的高度并行性构建了并行仿真框架。在PSCAD/EMTDC中进行仿真验证,该模型实现了对详细模型的多工况高度拟合,最大误差小于3%。当单相模块数为48时,最佳并行等效模型可实现对详细模型10000多倍的仿真提速。
