Effective model reduction methods are required to deal with new challenges in active distribution network simulations that are on a large scale and have complicated structures.In the development of advanced electromag...Effective model reduction methods are required to deal with new challenges in active distribution network simulations that are on a large scale and have complicated structures.In the development of advanced electromagnetic transient simulation programs,automated model reduction plays an important role.This paper proposes an automated realization algorithm for the Krylov subspace based model reduction methods of an active distribution network with which the reduced model can be automatically established according to a given threshold of reduction error.The combined state-space nodal analysis framework is employed to apply the automated model reduction algorithm in popular EMTP-type simulation programs.Simulations are performed using PSCAD and a self-developed program to show the feasibility and validity of the proposed methods.展开更多
为研究变压器式可控电抗器CRT(controllable reactor of transformer type)的暂态特性,将CRT的工作过程分为接入过程和换级过程,并根据等值电路图分别建立了暂态数学模型.以包含4个控制绕组的CRT为例,利用电磁暂态计算程序ATP-EMTP建立...为研究变压器式可控电抗器CRT(controllable reactor of transformer type)的暂态特性,将CRT的工作过程分为接入过程和换级过程,并根据等值电路图分别建立了暂态数学模型.以包含4个控制绕组的CRT为例,利用电磁暂态计算程序ATP-EMTP建立了仿真模型.通过对不同电压初相位的仿真计算,得出了最理想的接入过程工作方式,以及在最严重情况下的激磁电流;通过对不同晶闸管投入时刻下换级过程的仿真分析,得出了最理想的换级过程工作方式.仿真结果与分析结果一致,可以为CRT后续的控制系统设计提供可靠的暂态性能数据.展开更多
半波长交流输电线路的特性与常规线路差异较大,目前尚没有实际工程应用。在工程实施前,开展真型线路试验对半波长输电的特性进行验证十分必要。该文对采用多段750 k V线路串联形成的半波长真型线路进行了研究,提出了半波长真型线路试验...半波长交流输电线路的特性与常规线路差异较大,目前尚没有实际工程应用。在工程实施前,开展真型线路试验对半波长输电的特性进行验证十分必要。该文对采用多段750 k V线路串联形成的半波长真型线路进行了研究,提出了半波长真型线路试验路径方案,构建了点对网的真型线路试验系统。采用电磁暂态计算程序(EM TPE)对真型线路的稳态特性进行了研究,分析了沿线装置和线路参数不均匀等因素的影响;研究了半波长真型线路试验系统的过电压特性,并提出过电压的控制措施。研究结果表明:采用多段750 k V线路串联而成的真型线路,其稳态特性与均匀半波长线路基本相符;采用750 k V变电站内避雷器,可以将真型线路试验过电压控制在允许水平内。展开更多
基金supported in part by the National Key Technology Research and Development Program of China(2013BAAOlB03)in part by the National Natural Science Foundation of China(51261130473).
文摘Effective model reduction methods are required to deal with new challenges in active distribution network simulations that are on a large scale and have complicated structures.In the development of advanced electromagnetic transient simulation programs,automated model reduction plays an important role.This paper proposes an automated realization algorithm for the Krylov subspace based model reduction methods of an active distribution network with which the reduced model can be automatically established according to a given threshold of reduction error.The combined state-space nodal analysis framework is employed to apply the automated model reduction algorithm in popular EMTP-type simulation programs.Simulations are performed using PSCAD and a self-developed program to show the feasibility and validity of the proposed methods.
文摘为研究变压器式可控电抗器CRT(controllable reactor of transformer type)的暂态特性,将CRT的工作过程分为接入过程和换级过程,并根据等值电路图分别建立了暂态数学模型.以包含4个控制绕组的CRT为例,利用电磁暂态计算程序ATP-EMTP建立了仿真模型.通过对不同电压初相位的仿真计算,得出了最理想的接入过程工作方式,以及在最严重情况下的激磁电流;通过对不同晶闸管投入时刻下换级过程的仿真分析,得出了最理想的换级过程工作方式.仿真结果与分析结果一致,可以为CRT后续的控制系统设计提供可靠的暂态性能数据.
文摘半波长交流输电线路的特性与常规线路差异较大,目前尚没有实际工程应用。在工程实施前,开展真型线路试验对半波长输电的特性进行验证十分必要。该文对采用多段750 k V线路串联形成的半波长真型线路进行了研究,提出了半波长真型线路试验路径方案,构建了点对网的真型线路试验系统。采用电磁暂态计算程序(EM TPE)对真型线路的稳态特性进行了研究,分析了沿线装置和线路参数不均匀等因素的影响;研究了半波长真型线路试验系统的过电压特性,并提出过电压的控制措施。研究结果表明:采用多段750 k V线路串联而成的真型线路,其稳态特性与均匀半波长线路基本相符;采用750 k V变电站内避雷器,可以将真型线路试验过电压控制在允许水平内。
