A low-carbon energy management strategy for the integrated power system based on compressed carbon dioxide energy storage system and thermal power plant

Renewable energy has boomed to make up for the thermal power, reducing carbon emissions. The energy storage system is adopted to handle its intermittence and fluctuation. To utilize renewable energy and reduce carbon emissions, a Low-carbon energy management strategy for the integrated power system is proposed. Firstly, an integrated power system of the wind turbine, compressed carbon dioxide energy storage system, and thermal power plant is introduced. Subsequently, the operating method of the proposed strategy is described. Volume optimization is adopted in the research to evaluate the energy management strategy, where the wind curtailment and the internal rate of return should meet the requirement. A comparison is made between the proposed strategy and the traditional strategy. Two scenarios are adopted to show the system performance under different strategies. Result shows that under Scenario 1 with a certain wind turbine design power, the system under the proposed strategy has a higher internal rate of return and lower total carbon emissions. However, the wind curtailment under the proposed strategy and the internal rate of return of the traditional strategy do not meet the requirement. In Scenario 2, where the wind turbine design power is a decision variable, the optimization results of both strategies can meet the two requirements. The result shows that, compared to the traditional strategy, the proposed strategy has an increment in wind turbine design power of 2.59 MW, and a reduction in carbon emissions of 7.48k tons. Moreover, other cases are adopted to prove the universality of the conclusions.