局部遮蔽情况下,光伏阵列的P-U曲线将出现多个峰值。为了快速准确地找到全局最大功率点,提出了一种基于改进灰狼优化算法和黄金分割法的混合控制方法。首先采用改进的灰狼优化算法进行全局搜索确定全局最大功率点的大致位置,然后采用黄...局部遮蔽情况下,光伏阵列的P-U曲线将出现多个峰值。为了快速准确地找到全局最大功率点,提出了一种基于改进灰狼优化算法和黄金分割法的混合控制方法。首先采用改进的灰狼优化算法进行全局搜索确定全局最大功率点的大致位置,然后采用黄金分割法在前期搜索的基础上进行局部搜索。此外,还提出了一种基于类P-U曲线斜率的新型重启判别方法,以增强最大功率点追踪MPPT(maximum power point tracking)系统应对光照突变时的可靠性。最后,仿真和实验验证了该算法在多种条件下均可更加快速可靠地追踪到全局最大功率点。展开更多
The strength of the connection structure has always been a key issue in the structural design of a launch vehicle.In this paper,the finite element analysis method is used for the strength of typical connection structu...The strength of the connection structure has always been a key issue in the structural design of a launch vehicle.In this paper,the finite element analysis method is used for the strength of typical connection structures of a new launch vehicle.The research scope includes the inter-stage connection structure and the bundle connection structure.Aiming at establishing the strength of these two connection structures under flight conditions,we built a refined finite element model,simulated the bolt tensile test and obtained a calculation criteria,and carried out finite element analysis of the connection structures under flight conditions.As a result,we not only established the analysis and evaluation method of the connection structures based on the refined finite element modeling analysis,but also provided a fast numerical simulation design method for the development of the launch vehicle’s connection structures,which greatly improved the design efficiency and reduced the design risk.展开更多
文摘局部遮蔽情况下,光伏阵列的P-U曲线将出现多个峰值。为了快速准确地找到全局最大功率点,提出了一种基于改进灰狼优化算法和黄金分割法的混合控制方法。首先采用改进的灰狼优化算法进行全局搜索确定全局最大功率点的大致位置,然后采用黄金分割法在前期搜索的基础上进行局部搜索。此外,还提出了一种基于类P-U曲线斜率的新型重启判别方法,以增强最大功率点追踪MPPT(maximum power point tracking)系统应对光照突变时的可靠性。最后,仿真和实验验证了该算法在多种条件下均可更加快速可靠地追踪到全局最大功率点。
文摘The strength of the connection structure has always been a key issue in the structural design of a launch vehicle.In this paper,the finite element analysis method is used for the strength of typical connection structures of a new launch vehicle.The research scope includes the inter-stage connection structure and the bundle connection structure.Aiming at establishing the strength of these two connection structures under flight conditions,we built a refined finite element model,simulated the bolt tensile test and obtained a calculation criteria,and carried out finite element analysis of the connection structures under flight conditions.As a result,we not only established the analysis and evaluation method of the connection structures based on the refined finite element modeling analysis,but also provided a fast numerical simulation design method for the development of the launch vehicle’s connection structures,which greatly improved the design efficiency and reduced the design risk.