Coal consumption curve of the thermal power plant can reflect the function relationship between the coal consumption of unit and load, which plays a key role for research on unit economic operation and load optimal di...Coal consumption curve of the thermal power plant can reflect the function relationship between the coal consumption of unit and load, which plays a key role for research on unit economic operation and load optimal dispatch. Now get coal consumption curve is generally obtained by least square method, but which are static curve and these curves remain unchanged for a long time, and make them are incompatible with the actual operation situation of the unit. Furthermore, coal consumption has the characteristics of typical nonlinear and time varying, sometimes the least square method does not work for nonlinear complex problems. For these problems, a method of coal consumption curve fitting of the thermal power plant units based on genetic algorithm is proposed. The residual analysis method is used for data detection;quadratic function is employed to the objective function;appropriate parameters such as initial population size, crossover rate and mutation rate are set;the unit’s actual coal consumption curves are fitted, and comparing the proposed method with least squares method, the results indicate that fitting effect of the former is better than the latter, and further indicate that the proposed method to do curve fitting can best approximate known data in a certain significance, and they can real-timely reflect the interdependence between power output and coal consumption.展开更多
液化空气储能(liquefied air energy storage, LAES)因其存储规模大和不受地理条件限制的独特优势,可参与现有燃煤机组的调峰改造,以推进新型电力系统的建设发展。为此提出一种与燃煤机组耦合的新型LAES系统,并且建立耦合系统的热力学...液化空气储能(liquefied air energy storage, LAES)因其存储规模大和不受地理条件限制的独特优势,可参与现有燃煤机组的调峰改造,以推进新型电力系统的建设发展。为此提出一种与燃煤机组耦合的新型LAES系统,并且建立耦合系统的热力学模型和经济性模型,分析储能容量变化对耦合系统的影响。结果表明:与某670 MW燃煤机组耦合时,可以综合考虑选择44.2 MW/176.8 MW·h的液化空气储能系统。在燃煤机组的3种低负荷(30%THA、40%THA和50%THA)工况下,耦合运行的LAES系统的往返效率在51%左右,比单独运行的LAES系统高出大约9个百分点。耦合运行的LAES系统的投资收益率接近10%,14 a之内可实现投资回收。敏感性分析显示增大峰谷电价差有利于提升系统的经济性能。展开更多
文摘Coal consumption curve of the thermal power plant can reflect the function relationship between the coal consumption of unit and load, which plays a key role for research on unit economic operation and load optimal dispatch. Now get coal consumption curve is generally obtained by least square method, but which are static curve and these curves remain unchanged for a long time, and make them are incompatible with the actual operation situation of the unit. Furthermore, coal consumption has the characteristics of typical nonlinear and time varying, sometimes the least square method does not work for nonlinear complex problems. For these problems, a method of coal consumption curve fitting of the thermal power plant units based on genetic algorithm is proposed. The residual analysis method is used for data detection;quadratic function is employed to the objective function;appropriate parameters such as initial population size, crossover rate and mutation rate are set;the unit’s actual coal consumption curves are fitted, and comparing the proposed method with least squares method, the results indicate that fitting effect of the former is better than the latter, and further indicate that the proposed method to do curve fitting can best approximate known data in a certain significance, and they can real-timely reflect the interdependence between power output and coal consumption.
文摘液化空气储能(liquefied air energy storage, LAES)因其存储规模大和不受地理条件限制的独特优势,可参与现有燃煤机组的调峰改造,以推进新型电力系统的建设发展。为此提出一种与燃煤机组耦合的新型LAES系统,并且建立耦合系统的热力学模型和经济性模型,分析储能容量变化对耦合系统的影响。结果表明:与某670 MW燃煤机组耦合时,可以综合考虑选择44.2 MW/176.8 MW·h的液化空气储能系统。在燃煤机组的3种低负荷(30%THA、40%THA和50%THA)工况下,耦合运行的LAES系统的往返效率在51%左右,比单独运行的LAES系统高出大约9个百分点。耦合运行的LAES系统的投资收益率接近10%,14 a之内可实现投资回收。敏感性分析显示增大峰谷电价差有利于提升系统的经济性能。
