Two new secolignans （1 and 2） were isolated from the roots of Urtica mairei Levi. The structures of these two compounds were determined on the basis of extensive spectroscopic methods including HR-EI-MS, 1D and 2D N...Two new secolignans （1 and 2） were isolated from the roots of Urtica mairei Levi. The structures of these two compounds were determined on the basis of extensive spectroscopic methods including HR-EI-MS, 1D and 2D NMR experiments.展开更多
局部阴影条件下,光伏阵列的P-U曲线呈多峰状态,常规的最大功率点追踪MPPT(maximum power point tracking)算法容易陷入局部极值,无法及时精确地跟踪光伏发电系统的最大功率点,针对此问题提出1种基于改进蜣螂IDBO(improved dung beetle o...局部阴影条件下,光伏阵列的P-U曲线呈多峰状态,常规的最大功率点追踪MPPT(maximum power point tracking)算法容易陷入局部极值,无法及时精确地跟踪光伏发电系统的最大功率点,针对此问题提出1种基于改进蜣螂IDBO(improved dung beetle optimizer)算法的MPPT控制策略。首先对蜣螂种群的初始化进行针对性优化,并在位置更新过程中引入Levy飞行策略。通过在MATLAB/Simulink平台进行仿真验证及实物实验验证,证明了IDBO算法相较于传统算法,无论是在静态还是动态条件下,均能更快且更稳定地找到全局最大功率点。展开更多
基金the NSFC project(No.30572317)research project of the Educational Department of Liaoning Province(No.2004F114)for the financial supports.
文摘Two new secolignans （1 and 2） were isolated from the roots of Urtica mairei Levi. The structures of these two compounds were determined on the basis of extensive spectroscopic methods including HR-EI-MS, 1D and 2D NMR experiments.
文摘局部阴影条件下,光伏阵列的P-U曲线呈多峰状态,常规的最大功率点追踪MPPT(maximum power point tracking)算法容易陷入局部极值,无法及时精确地跟踪光伏发电系统的最大功率点,针对此问题提出1种基于改进蜣螂IDBO(improved dung beetle optimizer)算法的MPPT控制策略。首先对蜣螂种群的初始化进行针对性优化,并在位置更新过程中引入Levy飞行策略。通过在MATLAB/Simulink平台进行仿真验证及实物实验验证,证明了IDBO算法相较于传统算法,无论是在静态还是动态条件下,均能更快且更稳定地找到全局最大功率点。
