高频隔离型双有源桥(dual active bridge,DAB)变换器是电力电子变压器(power electronic transformer,PET)的核心设备之一。其中,高频链的存在以及高开关频率特性,使得PET电磁暂态仿真效率较低。该文对先前研究提出的DAB型变换器积分解...高频隔离型双有源桥(dual active bridge,DAB)变换器是电力电子变压器(power electronic transformer,PET)的核心设备之一。其中,高频链的存在以及高开关频率特性,使得PET电磁暂态仿真效率较低。该文对先前研究提出的DAB型变换器积分解耦算法进行稳定性与截断误差分析,以提高该方法的可信度。首先,建立DAB简化电路并列写其状态方程;其次,选取特殊对称矩阵,利用Lyapunov直接法分析前向欧拉、梯形积分和积分解耦方法下连续系统与离散系统的稳定性,计算不同积分方法的局部截断误差,建立相对均方根误差作为全局误差的衡量指标;并结合实际变压器参数取值,分析不同积分方法对仿真步长的约束;最后,在PSCAD/EMTDC中,进行稳定性与误差验证。结果表明,积分解耦法和梯形积分法的稳定性与截断误差均不会对仿真步长产生附加约束。展开更多
The problem of the stability analysis and controller design which the network-induced delays and data dropout problems network-induced delays are assumed to be time-varying and bounded, for Lurie networked control sys...The problem of the stability analysis and controller design which the network-induced delays and data dropout problems network-induced delays are assumed to be time-varying and bounded, for Lurie networked control systems （NCSs） is investigated, in are simultaneously considered. By considering that the and analyzing the relationship between the delay and its upper bound, employing a Lyapunov-Krasovskii function and an integral inequality approach, an improved stability criterion for NCSs is proposed. Furthermore, the resulting condition is extended to design a less conservative state feedback controller by employing an improved cone complementary linearization （ICCL） algorithm. Numerical examples are provided to show the effectiveness of the method.展开更多
A nonlinear pressure controller was presented to track desired feeding pressure for the cutter feeding system(CFS) of trench cutter(TC) in the presence of unknown external disturbances.The feeding pressure control of ...A nonlinear pressure controller was presented to track desired feeding pressure for the cutter feeding system(CFS) of trench cutter(TC) in the presence of unknown external disturbances.The feeding pressure control of CFS is subjected to unknown load characteristics of rock or soil; in addition,the geological condition is time-varying.Due to the complex load characteristics of rock or soil,the feeding velocity of TC is related to geological conditions.What is worse,its dynamic model is subjected to uncertainties and its function is unknown.To deal with the particular characteristics of CFS,a novel adaptive fuzzy integral sliding mode control(AFISMC) was designed for feeding pressure control of CFS,which combines the robust characteristics of an integral sliding mode controller and the adaptive adjusting characteristics of an adaptive fuzzy controller.The AFISMC feeding pressure controller is synthesized using the backstepping technique.The stability of the overall closed-loop system consisting of the adaptive fuzzy inference system,integral sliding mode controller and the cutter feeding system is proved using Lyapunov theory.Experiments are conducted on a TC test bench with the AFISMC under different operating conditions.The experimental results demonstrate that the proposed AFISMC feeding pressure controller for CFS gives a superior and robust pressure tracking performance with maximum pressure tracking error within ?0.3 MPa.展开更多
基金Supported by National Natural Science Foundation of China(61273123,61304059)Program for New Century Excellent Talents in University(NCET-13-0878)Program for Scientific Research Innovation Team in Colleges and Universities of Shandong Province
文摘高频隔离型双有源桥(dual active bridge,DAB)变换器是电力电子变压器(power electronic transformer,PET)的核心设备之一。其中,高频链的存在以及高开关频率特性,使得PET电磁暂态仿真效率较低。该文对先前研究提出的DAB型变换器积分解耦算法进行稳定性与截断误差分析,以提高该方法的可信度。首先,建立DAB简化电路并列写其状态方程;其次,选取特殊对称矩阵,利用Lyapunov直接法分析前向欧拉、梯形积分和积分解耦方法下连续系统与离散系统的稳定性,计算不同积分方法的局部截断误差,建立相对均方根误差作为全局误差的衡量指标;并结合实际变压器参数取值,分析不同积分方法对仿真步长的约束;最后,在PSCAD/EMTDC中,进行稳定性与误差验证。结果表明,积分解耦法和梯形积分法的稳定性与截断误差均不会对仿真步长产生附加约束。
基金supported by Natural Science Foundation of China(61203054,61203014)the Priority Academic Program Development of Jiangsu Higher Education Institutions+1 种基金Initial Research Fund of Highly Specialized Personnel from Jiangsu University(11JDG103)Natural Science Foundation of Jiangsu Province(BK2012283)
基金Project(61025015)supported by the National Natural Science Foundation of China for Distinguished Young ScholarsProject (IRT1044)supported by the Program for Changjiang Scholars and Innovative Research Team in University of China+2 种基金Projects(61143004,61203136,61074067,61273185)supported by the National Natural Science Foundation of ChinaProjects(12JJ4062,11JJ2033)supported by the Natural Science Foundation of Hunan Province,ChinaProject(12C0078)supported by Hunan Provincial Department of Education,China
文摘The problem of the stability analysis and controller design which the network-induced delays and data dropout problems network-induced delays are assumed to be time-varying and bounded, for Lurie networked control systems （NCSs） is investigated, in are simultaneously considered. By considering that the and analyzing the relationship between the delay and its upper bound, employing a Lyapunov-Krasovskii function and an integral inequality approach, an improved stability criterion for NCSs is proposed. Furthermore, the resulting condition is extended to design a less conservative state feedback controller by employing an improved cone complementary linearization （ICCL） algorithm. Numerical examples are provided to show the effectiveness of the method.
基金Project(2012AA041801)supported by the High-tech Research and Development Program of China
文摘A nonlinear pressure controller was presented to track desired feeding pressure for the cutter feeding system(CFS) of trench cutter(TC) in the presence of unknown external disturbances.The feeding pressure control of CFS is subjected to unknown load characteristics of rock or soil; in addition,the geological condition is time-varying.Due to the complex load characteristics of rock or soil,the feeding velocity of TC is related to geological conditions.What is worse,its dynamic model is subjected to uncertainties and its function is unknown.To deal with the particular characteristics of CFS,a novel adaptive fuzzy integral sliding mode control(AFISMC) was designed for feeding pressure control of CFS,which combines the robust characteristics of an integral sliding mode controller and the adaptive adjusting characteristics of an adaptive fuzzy controller.The AFISMC feeding pressure controller is synthesized using the backstepping technique.The stability of the overall closed-loop system consisting of the adaptive fuzzy inference system,integral sliding mode controller and the cutter feeding system is proved using Lyapunov theory.Experiments are conducted on a TC test bench with the AFISMC under different operating conditions.The experimental results demonstrate that the proposed AFISMC feeding pressure controller for CFS gives a superior and robust pressure tracking performance with maximum pressure tracking error within ?0.3 MPa.
