期刊文献+
共找到2篇文章
< 1 >
每页显示 20 50 100
永磁风电机组全程高效风能获取非线性控制器设计
1
作者 王冰 张一鸣 周建良 《河海大学学报(自然科学版)》 CAS CSCD 北大核心 2013年第2期166-170,共5页
针对永磁风电机组中存在的主要非线性环节(风能捕获功率的复杂非线性、发电机的典型非线性),设计风机转子角速度决策环节和非线性控制器,实现对风电机组的精确控制,达到全风速范围高效风能获取的目标。首先通过非线性观测器得到风速估计... 针对永磁风电机组中存在的主要非线性环节(风能捕获功率的复杂非线性、发电机的典型非线性),设计风机转子角速度决策环节和非线性控制器,实现对风电机组的精确控制,达到全风速范围高效风能获取的目标。首先通过非线性观测器得到风速估计值,然后通过风能捕获功率的复杂非线性函数分析得到角速度参考值,最后利用角速度参考值与实际角速度值的差值驱动非线性控制器得到控制电压,以实现全程高效风能获取。针对风电机组模型,基于Lyapunov定理设计非线性控制器,能使实际角速度准确跟踪理想角速度的变化。仿真验证结果表明,非线性控制器的设计方法可行、有效。 展开更多
关键词 永磁风电机组 非线性控制器设计 Lyapunov定理 高效风能
下载PDF
Trends in Significant Wave Height and Surface Wind Speed in the China Seas Between 1988 and 2011 被引量:1
2
作者 ZHENG Chongwei ZHANG Ren +2 位作者 SHI Weilai LI Xin CHEN Xuan 《Journal of Ocean University of China》 SCIE CAS CSCD 2017年第5期717-726,共10页
Wind and waves are key components of the climate system as they drive air-sea interactions and influence weather systems and atmospheric circulation. In marine environments, understanding surface wind and wave fields ... Wind and waves are key components of the climate system as they drive air-sea interactions and influence weather systems and atmospheric circulation. In marine environments, understanding surface wind and wave fields and their evolution over time is important for conducting safe and efficient human activities, such as navigation and engineering. This study considers long-term trends in the sea surface wind speed(WS) and significant wave height(SWH) in the China Seas over the period 1988–2011 using the Cross-Calibrated Multi-Platform(CCMP) ocean surface wind product and a 24-year hindcast wave dataset obtained from the WAVEWATCH-III(WW3) wave model forced with CCMP winds. The long-term trends in WS and SWH in the China Seas are analyzed over the past 24 years to provide a reference point from which to assess future climate change and offshore wind and wave energy resource development in the region. Results demonstrate that over the period 1988–2011 in the China Seas: 1) WS and SWH showed a significant increasing trend of 3.38 cm s^(-1)yr^(-1) and 1.52 cm yr^(-1), respectively; 2) there were notable regional differences in the long-term trends of WS and SWH; 3) areas with strong increasing trends were located mainly in the middle of the Tsushima Strait, the northern and southern areas of the Taiwan Strait, and in nearshore regions of the northern South China Sea; and 4) the long-term trend in WS was closely associated with El Ni?o and a significant increase in the occurrence of gale force winds in the region. 展开更多
关键词 ocean winds offshore Taiwan notable weather navigation environments forced conducting
下载PDF
上一页 1 下一页 到第
使用帮助 返回顶部