Technical And Economic Analysis Of Gas Power Plants On Power Peaking

An increasing installed capacity is the character of China’s current power grid structure, in which grid unit capacity of clean energy generation is growing, but at the same time followed the increasing valley difference, more difficult frequency modulation and greater demand for the flexible and efficient peaking powers. Gas turbine power plants are good choice for the power peaking. But power peaking will have a great impact on the technical and economic aspects of the gas turbine units, so the quantitative study of it is significant.In this paper, the characteristics of the gas turbine peaking and the economic cost are conducted by the literature research and modeling studies. It quantifies the effects of peaking power generation cost, efficiency and service life of the unit. It makes a contribution to quantitatively reflect the economic price needs of gas turbine unit in the process of power peaking and provides references to the compensating for the grid (such as peak shaving, etc.).In this paper, modeling calculations of the economic cost of the gas power plant is conducted, specifically the proportion of each components and respective factors. Environmental cost of natural gas is also analyzed in this paper. It shows that the cost of power generation analysis when taking into account the environmental cost is more scientific and more rational. Calculated results show that the environmental value of natural gas is 0.09 yuan/kWh when compared to the same capacity coal-fired electricity generation units, and equivalent to 14% of the cost of electricity, which shows the environmental advantage of natural gas in the power generation.In this paper, the effect of peaking on unit efficiency and service life of the gas turbine unit are also analyzed. It quantifies the lost service life and changes in maintenance factors caused by peaking, and finally reflects to the influence on the cost of power generation. The results show that the lower the running load of the unit is, the lower the unit efficiency is, the greater the loss of service life is, and the more the cost of power generation increment is.By studying the impact of peaking on the gas power plants in the aspect of technical and economic, the advantages and disadvantages of gas turbines as peaking power can be seen more scientifically, and the basis for the selection of peaking power and the way of peaking can be provided.