This paper is concerned with the Hopf bifurcation control of a modified Pan-like chaotic system. Based on the Routh-Hurwtiz theory and high-dimensional Hopf bifurcation theory, the existence and stability of the Hopf ...This paper is concerned with the Hopf bifurcation control of a modified Pan-like chaotic system. Based on the Routh-Hurwtiz theory and high-dimensional Hopf bifurcation theory, the existence and stability of the Hopf bifurcation depending on selected values of the system parameters are studied. The region of the stability for the Hopf bifurcation is investigated.By the hybrid control method, a nonlinear controller is designed for changing the Hopf bifurcation point and expanding the range of the stability. Discussions show that with the change of parameters of the controller, the Hopf bifurcation emerges at an expected location with predicted properties and the range of the Hopf bifurcation stability is expanded. Finally,numerical simulation is provided to confirm the analytic results.展开更多
最大功率点跟踪(maximum power point tracking,MPPT)已用于实际变速恒频风电系统中,为更好开展此项技术的研究,对当前的最大功率点跟踪技术进行了总结,并分为以下3类:1)已知给定法;2)黑箱法;3)混合控制法。以带齿轮箱35 kW背靠背变换...最大功率点跟踪(maximum power point tracking,MPPT)已用于实际变速恒频风电系统中,为更好开展此项技术的研究,对当前的最大功率点跟踪技术进行了总结,并分为以下3类:1)已知给定法;2)黑箱法;3)混合控制法。以带齿轮箱35 kW背靠背变换器的鼠笼异步式风力发电并网系统为基础,在Matlab/Simulink仿真环境中,针对已知给定法、黑箱法、混合控制法,各选取了每一类方法的典型代表进行了仿真验证。仿真结果表明,针对这3类方法所适用的功率场合不同,在跟踪最大功率的快速性上存在着差异,需要根据风机特性及从实际运用角度出发来选取不同的方法。展开更多
根据性能寻优控制(Perform ance Seek ing Con trol)优化模式的特点,针对某型涡扇发动机,研究了把发动机性能优化问题描述为线性规划问题。同时针对线性规划方法可能会收敛于局部极小值和非线性方法计算量大的问题,提出了基于LP(L inear...根据性能寻优控制(Perform ance Seek ing Con trol)优化模式的特点,针对某型涡扇发动机,研究了把发动机性能优化问题描述为线性规划问题。同时针对线性规划方法可能会收敛于局部极小值和非线性方法计算量大的问题,提出了基于LP(L inear P rogramm ing)和MAPS(M odel-A ssisted Pattern Search)混合优化方法,并研究了LP和MAPS混合优化方法在航空发动机性能寻优控制中的应用,同时在最大推力控制模式和最小油耗控制模式下进行了仿真。大量仿真结果表明,采用混合优化方法可进一步提高发动机的性能,并且大大减少了计算量。展开更多
基金Project supported by the National Natural Science Foundation of China(Grant No.11372102)
文摘This paper is concerned with the Hopf bifurcation control of a modified Pan-like chaotic system. Based on the Routh-Hurwtiz theory and high-dimensional Hopf bifurcation theory, the existence and stability of the Hopf bifurcation depending on selected values of the system parameters are studied. The region of the stability for the Hopf bifurcation is investigated.By the hybrid control method, a nonlinear controller is designed for changing the Hopf bifurcation point and expanding the range of the stability. Discussions show that with the change of parameters of the controller, the Hopf bifurcation emerges at an expected location with predicted properties and the range of the Hopf bifurcation stability is expanded. Finally,numerical simulation is provided to confirm the analytic results.
文摘最大功率点跟踪(maximum power point tracking,MPPT)已用于实际变速恒频风电系统中,为更好开展此项技术的研究,对当前的最大功率点跟踪技术进行了总结,并分为以下3类:1)已知给定法;2)黑箱法;3)混合控制法。以带齿轮箱35 kW背靠背变换器的鼠笼异步式风力发电并网系统为基础,在Matlab/Simulink仿真环境中,针对已知给定法、黑箱法、混合控制法,各选取了每一类方法的典型代表进行了仿真验证。仿真结果表明,针对这3类方法所适用的功率场合不同,在跟踪最大功率的快速性上存在着差异,需要根据风机特性及从实际运用角度出发来选取不同的方法。
文摘根据性能寻优控制(Perform ance Seek ing Con trol)优化模式的特点,针对某型涡扇发动机,研究了把发动机性能优化问题描述为线性规划问题。同时针对线性规划方法可能会收敛于局部极小值和非线性方法计算量大的问题,提出了基于LP(L inear P rogramm ing)和MAPS(M odel-A ssisted Pattern Search)混合优化方法,并研究了LP和MAPS混合优化方法在航空发动机性能寻优控制中的应用,同时在最大推力控制模式和最小油耗控制模式下进行了仿真。大量仿真结果表明,采用混合优化方法可进一步提高发动机的性能,并且大大减少了计算量。
