关键词: 综合灵活运行方式, 光热电站, 风电, 调峰

Abstract:

In order to achieve low-carbon energy in the power system, the measures like vigorously developing carbon capture and storage technologies and new energy sources such as wind and solar power are very important. However, the technical constraints of the minimum output of carbon capture power plants and the reverse peak-shaving characteristics of wind power have restricted the wind power consumption and carbon emission reduction. The liquid storage tank under the flexible operation mode of carbon capture is used to carry out “energy time-shift” and “carbon transfer”, which can indirectly absorb wind power and reduce carbon emissions. CO₂ captured by carbon capture equipment may be used as the raw material for power-to-gas to reduce carbon storage costs and power-to-gas costs, which is helpful to furtherion eliminat of wind power and obtain gas sales revenue. Because the load has morning and evening peaks, the good peak-regulation performance of the thermal storage type concentrating solar power (CSP) station is used to transfer part of the heat during the day to the evening peak power generation, so as to relieve the system’s peak-regulation pressure. To this end, this paper constructs an optimal scheduling model for virtual power plants containing power-to-gas and solar thermal power plants considering the comprehensive and flexible operation of carbon capture power plants. The commercial solver Cplex in the YALMIP toolkit of Matlab software is used to optimize the model in this paper. The simulation results show that the proposed model can further reduce wind curtailment, reduce carbon emissions and alleviate peak-shaving pressure.

Key words: comprehensive and flexible operation mode, CSP station, wind power, peak shaving