在实时性导通控制中,常用过零检测法和锁相环法。比较了过零检测法、三相单同步、三相双同步坐标系锁相环法,提出了适用于混合式固态交流断路器(Hybird Solid State Switch,HSSS)的单相自解耦锁相策略,并给出了数学模型和控制模型,通过...在实时性导通控制中,常用过零检测法和锁相环法。比较了过零检测法、三相单同步、三相双同步坐标系锁相环法,提出了适用于混合式固态交流断路器(Hybird Solid State Switch,HSSS)的单相自解耦锁相策略,并给出了数学模型和控制模型,通过分析稳态性能和动态性能得出了控制参数。在MATLAB/Simulink环境下构建上述实时性控制模型与HSSS模型,通过仿真与最优化分析验证了单相自解耦锁相环在各种电网电压工况下具有良好的锁相效果,能够实现HSSS的基本功能,满足实时性控制要求。展开更多
A three-DOF (degree of freedom) planar robot completely restrained and positioned parallel pulled by four wires was studied. The wire driving properties were analyzed through experiments. The restrained three-DOF plan...A three-DOF (degree of freedom) planar robot completely restrained and positioned parallel pulled by four wires was studied. The wire driving properties were analyzed through experiments. The restrained three-DOF planar platform was established based on slippery course and bearing, and dSPACE real-time control system was used to perform the platform's motion control experiment on robot. Based on the kinematic equation and mechanical balance equation of moving platform, the stiffness of the robot system was analyzed and the calibration scheme of the system considering wire tension was put forward. Position servo control experiments were carried out, position servo tracking precision was analyzed, and real-time wire tension was detected. The results show that the moving error of the moving platform tracking is small (the maximum difference is about 3%), and the rotation error is large (the maximum difference is about 12%). The wire tension has wave properties (the wire tension fluctuation is about 10 N).展开更多
Based on the abort strategy of fixed periods, a novel predictive control scheduling methodology was proposed to efficiently solve overrun problems. By applying the latest control value in the prediction sequences to t...Based on the abort strategy of fixed periods, a novel predictive control scheduling methodology was proposed to efficiently solve overrun problems. By applying the latest control value in the prediction sequences to the control objective, the new strategy was expected to optimize the control system for better performance and yet guarantee the schedulability of all tasks under overrun. The schedulability of the real-time systems with p-period overruns was analyzed, and the corresponding stability criteria was given as well. The simulation results show that the new approach can improve the performance of control system compared to that of conventional abort strategy, it can reduce the overshoot and adjust time as well as ensure the schedulability and stability.展开更多
文摘在实时性导通控制中,常用过零检测法和锁相环法。比较了过零检测法、三相单同步、三相双同步坐标系锁相环法,提出了适用于混合式固态交流断路器(Hybird Solid State Switch,HSSS)的单相自解耦锁相策略,并给出了数学模型和控制模型,通过分析稳态性能和动态性能得出了控制参数。在MATLAB/Simulink环境下构建上述实时性控制模型与HSSS模型,通过仿真与最优化分析验证了单相自解耦锁相环在各种电网电压工况下具有良好的锁相效果,能够实现HSSS的基本功能,满足实时性控制要求。
基金Project(20102304120007) supported by the Research Fund for the Doctoral Program of Higher Education of ChinaProject(QC2010009)supported by the Natural Science Foundation of Heilongjiang Province, China+1 种基金Projects(20110491030, LBH-Z10219) supported by China Postdoctoral Science FoundationProject(HEUCF120706) supported by the Fundamental Research Funds for the Central Universities of China
文摘A three-DOF (degree of freedom) planar robot completely restrained and positioned parallel pulled by four wires was studied. The wire driving properties were analyzed through experiments. The restrained three-DOF planar platform was established based on slippery course and bearing, and dSPACE real-time control system was used to perform the platform's motion control experiment on robot. Based on the kinematic equation and mechanical balance equation of moving platform, the stiffness of the robot system was analyzed and the calibration scheme of the system considering wire tension was put forward. Position servo control experiments were carried out, position servo tracking precision was analyzed, and real-time wire tension was detected. The results show that the moving error of the moving platform tracking is small (the maximum difference is about 3%), and the rotation error is large (the maximum difference is about 12%). The wire tension has wave properties (the wire tension fluctuation is about 10 N).
基金Project (60505018) supported by the National Natural Science Foundation of China
文摘Based on the abort strategy of fixed periods, a novel predictive control scheduling methodology was proposed to efficiently solve overrun problems. By applying the latest control value in the prediction sequences to the control objective, the new strategy was expected to optimize the control system for better performance and yet guarantee the schedulability of all tasks under overrun. The schedulability of the real-time systems with p-period overruns was analyzed, and the corresponding stability criteria was given as well. The simulation results show that the new approach can improve the performance of control system compared to that of conventional abort strategy, it can reduce the overshoot and adjust time as well as ensure the schedulability and stability.
