当光伏组件受到局部阴影遮挡时,其最大功率点跟踪(maximum power point tracking,MPPT)过程常出现误跟踪、跟踪速度慢、光伏组件输出功率低等问题.为使局部阴影下光伏组件保持快速、稳定、准确地最大功率输出,基于电导增量法(incrementa...当光伏组件受到局部阴影遮挡时,其最大功率点跟踪(maximum power point tracking,MPPT)过程常出现误跟踪、跟踪速度慢、光伏组件输出功率低等问题.为使局部阴影下光伏组件保持快速、稳定、准确地最大功率输出,基于电导增量法(incremental conductance algorithm,INC),结合全局比较算法(global comparison algorithm,GCA),提出一种基于电导增量/全局比较的复合MPPT算法(INC-GCA),并通过搭建Simulink仿真模型和设计光伏试验平台,验证该算法的可行性.结果表明:基于电导增量/全局比较的复合MPPT算法在光伏组件受到局部阴影遮挡时可准确追踪到最大功率,且跟踪速度快、可靠性高,完全避免了误跟踪问题;相较于电导增量法,该算法可有效提高光伏系统的发电效率,提升光伏电站的经济效益.展开更多
Baoying pumping station is a part of source pumping stations in East Route Project of South-to-North Water Transfer in China. Aiming at the characteristics of head varying, and making use of the function of pump adjus...Baoying pumping station is a part of source pumping stations in East Route Project of South-to-North Water Transfer in China. Aiming at the characteristics of head varying, and making use of the function of pump adjustable blade, mathematical models of pumping station optimal operation are established and solved with genetic algorithm. For different total pumping discharge and total pumping volume of water per day, in order to minimize pumping station operation cost, the number and operation duties of running pump units are respectively determined at different periods of time in a day. The results indicate that the saving of electrical cost is significantly effected by the schemes of adjusting blade angles and time-varying electrical price when pumping certain water volume of water per day, and compared with conventional operation schemes (namely, the schemes of pumping station operation at design blade angles based on certain pumping discharge), the electrical cost is saved by 4.73%-31.27%. Also, compared with the electrical cost of conventional operation schemes, the electrical cost is saved by 2.03%-5.79% by the schemes of adjusting blade angles when pumping certain discharge.展开更多
文摘当光伏组件受到局部阴影遮挡时,其最大功率点跟踪(maximum power point tracking,MPPT)过程常出现误跟踪、跟踪速度慢、光伏组件输出功率低等问题.为使局部阴影下光伏组件保持快速、稳定、准确地最大功率输出,基于电导增量法(incremental conductance algorithm,INC),结合全局比较算法(global comparison algorithm,GCA),提出一种基于电导增量/全局比较的复合MPPT算法(INC-GCA),并通过搭建Simulink仿真模型和设计光伏试验平台,验证该算法的可行性.结果表明:基于电导增量/全局比较的复合MPPT算法在光伏组件受到局部阴影遮挡时可准确追踪到最大功率,且跟踪速度快、可靠性高,完全避免了误跟踪问题;相较于电导增量法,该算法可有效提高光伏系统的发电效率,提升光伏电站的经济效益.
基金supported by Author Special Foundation of National Excellent Doctoral Dissertation of China (Grant No. 2007B41)Jiangsu Provincial Foundation of "333 Talents Engineering" of ChinaJiangsu Provincial Academic Header Foundation of Qinglan Engineering of China
文摘Baoying pumping station is a part of source pumping stations in East Route Project of South-to-North Water Transfer in China. Aiming at the characteristics of head varying, and making use of the function of pump adjustable blade, mathematical models of pumping station optimal operation are established and solved with genetic algorithm. For different total pumping discharge and total pumping volume of water per day, in order to minimize pumping station operation cost, the number and operation duties of running pump units are respectively determined at different periods of time in a day. The results indicate that the saving of electrical cost is significantly effected by the schemes of adjusting blade angles and time-varying electrical price when pumping certain water volume of water per day, and compared with conventional operation schemes (namely, the schemes of pumping station operation at design blade angles based on certain pumping discharge), the electrical cost is saved by 4.73%-31.27%. Also, compared with the electrical cost of conventional operation schemes, the electrical cost is saved by 2.03%-5.79% by the schemes of adjusting blade angles when pumping certain discharge.