随着因化石燃料过度消耗产生的温室效应成为了全球关注的焦点,我国正在大力推广利用太阳能等可再生清洁能源的发电技术,从而为电网的低碳运行做出贡献。其中,光伏发电的并网化和大型化必将是将来的主要发展趋势,提高光伏发电效率,增加...随着因化石燃料过度消耗产生的温室效应成为了全球关注的焦点,我国正在大力推广利用太阳能等可再生清洁能源的发电技术,从而为电网的低碳运行做出贡献。其中,光伏发电的并网化和大型化必将是将来的主要发展趋势,提高光伏发电效率,增加并网容量,都有助于发展低碳电网。由于光伏发电的随机性强,所以通过Matlab/Simulnik建造光伏电站的模型,根据真实的环境数据得出一年中的典型日光伏输出特性并进行了分析,最后提出了一种大型光伏电站的低碳调度。另一方面,随着光伏电站的容量不断增加,并网时需要考虑并解决更多的负面影响,而且要达到低碳运行的标准,这都对并网逆变器提出了更多的要求,所以提出了一种具有最大功率点跟踪(maximum power point tracking,MPPT)、无功及谐波电流补偿和有功控制相结合的大型光伏电站逆变器的多模式控制策略,并通过Matlab/Simulnik建模仿真验证了该控制策略的可行性及优点。展开更多
Aiming at the interferometric inverse synthetic aperture radar （InlSAR） imaging in the presence of squint, we investigate the influence of squint on the InlSAR imaging. First, coupling of the squint additive phase a...Aiming at the interferometric inverse synthetic aperture radar （InlSAR） imaging in the presence of squint, we investigate the influence of squint on the InlSAR imaging. First, coupling of the squint additive phase and the target azimuth/altitude coordinates to be solved may make the solution more difficult. Second, the squint angle may lead to estimation error of the vertical coordinates and distortion of the ultimate image. Traditional InlSAR imaging algorithms can not solve the above two problems effectively, so we propose a new method which combines the nonlinear least square （NLS） and coordinates transform （CT） to estimate the target coordinates, and a three-dimensional （3-D） image consistent with the real target is obtained accordingly. Simulations show that the proposed method is effective for the squint-mode InlSAR imaging.展开更多
文摘随着因化石燃料过度消耗产生的温室效应成为了全球关注的焦点,我国正在大力推广利用太阳能等可再生清洁能源的发电技术,从而为电网的低碳运行做出贡献。其中,光伏发电的并网化和大型化必将是将来的主要发展趋势,提高光伏发电效率,增加并网容量,都有助于发展低碳电网。由于光伏发电的随机性强,所以通过Matlab/Simulnik建造光伏电站的模型,根据真实的环境数据得出一年中的典型日光伏输出特性并进行了分析,最后提出了一种大型光伏电站的低碳调度。另一方面,随着光伏电站的容量不断增加,并网时需要考虑并解决更多的负面影响,而且要达到低碳运行的标准,这都对并网逆变器提出了更多的要求,所以提出了一种具有最大功率点跟踪(maximum power point tracking,MPPT)、无功及谐波电流补偿和有功控制相结合的大型光伏电站逆变器的多模式控制策略,并通过Matlab/Simulnik建模仿真验证了该控制策略的可行性及优点。
基金supported by the China National Funds for Distinguished Young Scientists (Grant No.61025006)
文摘Aiming at the interferometric inverse synthetic aperture radar （InlSAR） imaging in the presence of squint, we investigate the influence of squint on the InlSAR imaging. First, coupling of the squint additive phase and the target azimuth/altitude coordinates to be solved may make the solution more difficult. Second, the squint angle may lead to estimation error of the vertical coordinates and distortion of the ultimate image. Traditional InlSAR imaging algorithms can not solve the above two problems effectively, so we propose a new method which combines the nonlinear least square （NLS） and coordinates transform （CT） to estimate the target coordinates, and a three-dimensional （3-D） image consistent with the real target is obtained accordingly. Simulations show that the proposed method is effective for the squint-mode InlSAR imaging.
