As the large change of the grid load, many large capacity units of our country had to change the load in order to meet the gird need. When a thermal power plant receives a given load instruction from the grid, it is n...As the large change of the grid load, many large capacity units of our country had to change the load in order to meet the gird need. When a thermal power plant receives a given load instruction from the grid, it is necessary to set an optimal steam pressure to maintain the high efficiency of the plant. In the past optimization methods, during the process of calculation, the output of the turbine often changed, it was hard to maintain the output constant. Therefore, in combination with the theory of variable condition of turbine, calculation of governing stage and the matrix equation of thermal power system, an optimization method were put forward and an optimal solution was got in a given load.展开更多
最大功率点跟踪(maximum power point tracking,MPPT)已用于实际变速恒频风电系统中,为更好开展此项技术的研究,对当前的最大功率点跟踪技术进行了总结,并分为以下3类:1)已知给定法;2)黑箱法;3)混合控制法。以带齿轮箱35 kW背靠背变换...最大功率点跟踪(maximum power point tracking,MPPT)已用于实际变速恒频风电系统中,为更好开展此项技术的研究,对当前的最大功率点跟踪技术进行了总结,并分为以下3类:1)已知给定法;2)黑箱法;3)混合控制法。以带齿轮箱35 kW背靠背变换器的鼠笼异步式风力发电并网系统为基础,在Matlab/Simulink仿真环境中,针对已知给定法、黑箱法、混合控制法,各选取了每一类方法的典型代表进行了仿真验证。仿真结果表明,针对这3类方法所适用的功率场合不同,在跟踪最大功率的快速性上存在着差异,需要根据风机特性及从实际运用角度出发来选取不同的方法。展开更多
“Crossover”概念可以解释耐力项目运动中,运动强度和耐力训练对糖、脂肪代谢平衡的影响。根据“Crossover”的概念:耐力训练引起肌肉的生化适应,增加脂肪的氧化供能。小强度运动(≤45% VO2 m ax)以脂肪供能为主,大强度运动(～75% VO2 ...“Crossover”概念可以解释耐力项目运动中,运动强度和耐力训练对糖、脂肪代谢平衡的影响。根据“Crossover”的概念:耐力训练引起肌肉的生化适应,增加脂肪的氧化供能。小强度运动(≤45% VO2 m ax)以脂肪供能为主,大强度运动(～75% VO2 m ax)糖是主要供能底物,即便是经过耐力训练也不例外。展开更多
文摘As the large change of the grid load, many large capacity units of our country had to change the load in order to meet the gird need. When a thermal power plant receives a given load instruction from the grid, it is necessary to set an optimal steam pressure to maintain the high efficiency of the plant. In the past optimization methods, during the process of calculation, the output of the turbine often changed, it was hard to maintain the output constant. Therefore, in combination with the theory of variable condition of turbine, calculation of governing stage and the matrix equation of thermal power system, an optimization method were put forward and an optimal solution was got in a given load.
文摘最大功率点跟踪(maximum power point tracking,MPPT)已用于实际变速恒频风电系统中,为更好开展此项技术的研究,对当前的最大功率点跟踪技术进行了总结,并分为以下3类:1)已知给定法;2)黑箱法;3)混合控制法。以带齿轮箱35 kW背靠背变换器的鼠笼异步式风力发电并网系统为基础,在Matlab/Simulink仿真环境中,针对已知给定法、黑箱法、混合控制法,各选取了每一类方法的典型代表进行了仿真验证。仿真结果表明,针对这3类方法所适用的功率场合不同,在跟踪最大功率的快速性上存在着差异,需要根据风机特性及从实际运用角度出发来选取不同的方法。
文摘“Crossover”概念可以解释耐力项目运动中,运动强度和耐力训练对糖、脂肪代谢平衡的影响。根据“Crossover”的概念:耐力训练引起肌肉的生化适应,增加脂肪的氧化供能。小强度运动(≤45% VO2 m ax)以脂肪供能为主,大强度运动(～75% VO2 m ax)糖是主要供能底物,即便是经过耐力训练也不例外。
