Abstract
It is of great help for alleviating energy shortage and decreasing carbon emission to increase the proportion of renewable energy in energy structure. However, the volatility of renewable energy causes a mismatching for multi-energy flow in distributed micro-grid. To settle this problem, a standalone liquid air energy storage system coupled with cold energy of liquefied natural gas is proposed. A double-parameter regulation method is proposed to make the compressor cope with volatile wind power, and make the expander to meet the variable power demand. To improve the simulation precision, the dynamic behavior of packed bed is investigated and the link between the transient temperature of packed bed and system performance is achieved. The results indicate that the hourly power supply-demand in micro-grid gets balance by employing LAES, and the daily energy storage reaches 285 MWh which is more than enough for the energy demand in peak time (200 MWh). Moreover, the energy storage and supply gets balanced and the round trip efficiency reaches a stable value (63%) in the 8th day. In economic analysis, the short dynamic payback year (5 years) and high net present value (80 million dollars) indicate high economic feasibility. Finally, the proposed system obtains the optimal thermal energy storage density (96 kWh/m3), the minimum work consumption (643 kJ/kg), and the highest round trip efficiency (0.63) compared to those in previous literature.
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