在优化光伏系统最大功率跟踪(maximum power point tracking,MPPT)快速性、准确性和平稳性的同时,为简化模糊控制器的设计,提出一种可变天气参数(variable weather parameters,VWP)区间模糊MPPT控制策略。该策略以理想最大功率点(maximu...在优化光伏系统最大功率跟踪(maximum power point tracking,MPPT)快速性、准确性和平稳性的同时,为简化模糊控制器的设计,提出一种可变天气参数(variable weather parameters,VWP)区间模糊MPPT控制策略。该策略以理想最大功率点(maximum power point,MPP)所对应的控制量为中心建立一个VWP区间并将MPP的寻优范围限制在该区间内,可明显提高跟踪的快速性,同时通过减小模糊控制器的寻优步长保证搜索的准确性和平稳性。最后,仿真实验显示该控制策略的良好运行性能,验证该控制策略有比扰动观察法更好的MPPT暂态性能。展开更多
当天气情况快速变化时,如何同时优化光伏(photovoltaic,PV)系统在最大功率跟踪(maximum power point tracking,MPPT)控制中的快速性、准确性和平稳性目前仍是一个难题.针对这一问题,提出了一种可变天气参数(variable weather parameter,...当天气情况快速变化时,如何同时优化光伏(photovoltaic,PV)系统在最大功率跟踪(maximum power point tracking,MPPT)控制中的快速性、准确性和平稳性目前仍是一个难题.针对这一问题,提出了一种可变天气参数(variable weather parameter,VWP)分段模糊MPPT方法.该方法采用两条VWP直线将输出功率曲线分为三个跟踪区域,每个区域采用一个模糊控制器进行控制,其总体控制决策为:在控制量远离理想最大功率点(maximum power point,MPP)时采用大步长以确保跟踪的快速性,在控制量接近MPP时采用小步长以确保跟踪的准确性和平稳性.仿真实验证明,该控制方法比传统扰动观察法具有更好的快速性、准确性和平稳性.展开更多
[Objective] The aim was to study the characteristics in VWP period characteristics in one strong rainstorm process.[Method] Based on the previous studies,the VWP product characteristics in early period of strong rains...[Objective] The aim was to study the characteristics in VWP period characteristics in one strong rainstorm process.[Method] Based on the previous studies,the VWP product characteristics in early period of strong rainstorm,during the development and the end period in Hunan Province on April 8,2008 were studied.[Result] Before the occurrence of rainstorm,the destruction of low layer 'ND' layer indicated the increase of water vapor content layer.The intrusion of cold and dry air in the middle layer led to unstable layer;during the maintaining period of rainstorm,the strong vertical shear in the low layer led to the occurrence of strong rainstorm.The cold air in the boundary layer penetrated and led the rainstorm to the most prevailing stage.There was hailstorm on the ground.Before the disappearance of rainstorm(after 17:59),the entire wind field changed into consecutive 'ND' layer and it suggested that the strong convective cloud was far away from the location of radar,and indicated the end of rainstorm.[Conclusion] The study provided reference and basis for the pre-warning of rainstorm for temporary reporter.展开更多
The self-restoration properties in VWP networks are investigated with optimization about spare wavelength by simulations. Rapid restoration can be achieved by selection of rerouting path with long delay and no delay-l...The self-restoration properties in VWP networks are investigated with optimization about spare wavelength by simulations. Rapid restoration can be achieved by selection of rerouting path with long delay and no delay-limitation for new routes.展开更多
文摘在优化光伏系统最大功率跟踪(maximum power point tracking,MPPT)快速性、准确性和平稳性的同时,为简化模糊控制器的设计,提出一种可变天气参数(variable weather parameters,VWP)区间模糊MPPT控制策略。该策略以理想最大功率点(maximum power point,MPP)所对应的控制量为中心建立一个VWP区间并将MPP的寻优范围限制在该区间内,可明显提高跟踪的快速性,同时通过减小模糊控制器的寻优步长保证搜索的准确性和平稳性。最后,仿真实验显示该控制策略的良好运行性能,验证该控制策略有比扰动观察法更好的MPPT暂态性能。
文摘当天气情况快速变化时,如何同时优化光伏(photovoltaic,PV)系统在最大功率跟踪(maximum power point tracking,MPPT)控制中的快速性、准确性和平稳性目前仍是一个难题.针对这一问题,提出了一种可变天气参数(variable weather parameter,VWP)分段模糊MPPT方法.该方法采用两条VWP直线将输出功率曲线分为三个跟踪区域,每个区域采用一个模糊控制器进行控制,其总体控制决策为:在控制量远离理想最大功率点(maximum power point,MPP)时采用大步长以确保跟踪的快速性,在控制量接近MPP时采用小步长以确保跟踪的准确性和平稳性.仿真实验证明,该控制方法比传统扰动观察法具有更好的快速性、准确性和平稳性.
文摘[Objective] The aim was to study the characteristics in VWP period characteristics in one strong rainstorm process.[Method] Based on the previous studies,the VWP product characteristics in early period of strong rainstorm,during the development and the end period in Hunan Province on April 8,2008 were studied.[Result] Before the occurrence of rainstorm,the destruction of low layer 'ND' layer indicated the increase of water vapor content layer.The intrusion of cold and dry air in the middle layer led to unstable layer;during the maintaining period of rainstorm,the strong vertical shear in the low layer led to the occurrence of strong rainstorm.The cold air in the boundary layer penetrated and led the rainstorm to the most prevailing stage.There was hailstorm on the ground.Before the disappearance of rainstorm(after 17:59),the entire wind field changed into consecutive 'ND' layer and it suggested that the strong convective cloud was far away from the location of radar,and indicated the end of rainstorm.[Conclusion] The study provided reference and basis for the pre-warning of rainstorm for temporary reporter.
文摘The self-restoration properties in VWP networks are investigated with optimization about spare wavelength by simulations. Rapid restoration can be achieved by selection of rerouting path with long delay and no delay-limitation for new routes.
