The “theory of market transformation” has the following four outstanding features: 1. It focuses mainly on the structural features of official organizations and systems; 2. Structural features are studied mainly thr...The “theory of market transformation” has the following four outstanding features: 1. It focuses mainly on the structural features of official organizations and systems; 2. Structural features are studied mainly through large scale of questionnaire surveys; 3. The theoretical angle is top down; and 4. The countries undergoing market transformation studied by the Budapest School are mostly in East Europe, especially Hungary. In these societies, market transformation goes hand in hand with breakdown of the state system. This paper tries to propose a research approach to “analyses of practical process of market transformation” based on empirical studies of market transformation in China. This research approach focuses on specific practical process of market transformation, and tries to reach a new understanding of market transformation through studies of its process, mechanisms, techniques and logic. In methodology this approach attaches more importance to in depth case studies, sees the daily life as a stage of two interactive forces upward force and downward forces and synthesizes the mutually opposite “top down” and “bottom up” perspectives.展开更多
针对传统扰动观察法的扰动步长选取无法兼顾跟踪速度和稳态精度的缺陷,对传统扰动观察法进行改进,设计了一种变步长扰动观察法。首先分析光伏电池输出的P-U曲线的特点,然后阐述了基于Boost电路实现光伏最大功率点跟踪(MPPT,maximum powe...针对传统扰动观察法的扰动步长选取无法兼顾跟踪速度和稳态精度的缺陷,对传统扰动观察法进行改进,设计了一种变步长扰动观察法。首先分析光伏电池输出的P-U曲线的特点,然后阐述了基于Boost电路实现光伏最大功率点跟踪(MPPT,maximum power point tracking)的控制系统及其工作原理,最后利用Matlab/Simulink搭建基于传统算法以及改进算法的光伏发电MPPT仿真模型,并在同一环境下对这2种算法的跟踪效果进行仿真对比。结果表明,改进的算法有效弥补了传统算法的缺陷,在快速跟踪最大功率点的同时又保证了跟踪的精度,具有良好的动态性能和稳态性能。展开更多
文摘The “theory of market transformation” has the following four outstanding features: 1. It focuses mainly on the structural features of official organizations and systems; 2. Structural features are studied mainly through large scale of questionnaire surveys; 3. The theoretical angle is top down; and 4. The countries undergoing market transformation studied by the Budapest School are mostly in East Europe, especially Hungary. In these societies, market transformation goes hand in hand with breakdown of the state system. This paper tries to propose a research approach to “analyses of practical process of market transformation” based on empirical studies of market transformation in China. This research approach focuses on specific practical process of market transformation, and tries to reach a new understanding of market transformation through studies of its process, mechanisms, techniques and logic. In methodology this approach attaches more importance to in depth case studies, sees the daily life as a stage of two interactive forces upward force and downward forces and synthesizes the mutually opposite “top down” and “bottom up” perspectives.
文摘针对传统扰动观察法的扰动步长选取无法兼顾跟踪速度和稳态精度的缺陷,对传统扰动观察法进行改进,设计了一种变步长扰动观察法。首先分析光伏电池输出的P-U曲线的特点,然后阐述了基于Boost电路实现光伏最大功率点跟踪(MPPT,maximum power point tracking)的控制系统及其工作原理,最后利用Matlab/Simulink搭建基于传统算法以及改进算法的光伏发电MPPT仿真模型,并在同一环境下对这2种算法的跟踪效果进行仿真对比。结果表明,改进的算法有效弥补了传统算法的缺陷,在快速跟踪最大功率点的同时又保证了跟踪的精度,具有良好的动态性能和稳态性能。
