A Two-Stage Stochastic Dispatch for Combined Heat and Power System Considering Flexible Carbon Capture Device under Source and Network Coordination

Combined heat and power system plays important role in urban power supply and heating supply. However, “the heat-led” operation mode of combined heat and power units will cause difficulties in renewable energy accommodation and peak regulation, and a large amount of carbon dioxide will be emitted during operation. In order to reduce carbon dioxide emission, a carbon capture device (CCD) is introduced. Compared with crude CCD, flexible CCD can provide more operation flexible by means of setting flue gas bypass and solvent storage tanks. The flexible CCD can realize “peak load shifting” while reducing carbon dioxide emissions. Firstly, the mathematical formulation of a power plant with flexible CCD is studied. Secondly, a two-stage stochastic dispatch model for combined heat and power systems considering flexible CCD is proposed to handle the uncertainty of the wind power output. Finally, numerical results performed on the IEEE 24-bus system demonstrate the effectiveness of the proposed model on the reduction of carbon emissions and the promotion of wind power accommodation.