Research on the economy of peak shaving between the gas-fired power generation and the coal-fired power generation in the new power system
Power system balance and safety issues caused by intermittent and random of new energy power generation need to be addressed by the peaking system.The paper selects the overall competitiveness of coal-fired peaking and gas-fired peaking in different application scenarios to study,takes the levelized cost of energy as a measure standard,and fully considers fixed cost,start-up and shutdown cost,fuel cost,and carbon emission trading cost.The results show that the utilization hours of coal-fired and gas-fired units decrease while the number of start-ups and shutdowns increases with the increase of installed new energy power generations and utilization scales,leading to the increase of unit cost of electricity,but the cost difference between the two types of units gradually narrows,and the main influencing factors of unit cost of electricity change from fuel price to the combination of fuel price and maintenance cost.The sensitivity of unit cost of electricity of coal-fired power generation units to the fuel price,number of startups,shutdowns,and carbon price tends to decrease gradually but the sensitivity of unit cost of electricity of gas-fired power generation units is still the fuel price.On the one hand,when the carbon price is between 70 and 200 yuan/ton,the economy of coal-fired power generation is better in such regions with relatively rich coal resources as Shanxi and Inner Mongolia.On the other hand,the gas-fired power generation is more competitive in Sichuan,southeast coast,Hebei,and Hainan.The advantages of the gas-fired power generation would expend to all country if the carbon price reaches 500 yuan/ton in the future.
gas-fired power generationcoal-fired power generationpeak shavingnatural gas priceseconomyLCOE
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