Abstract
Integrated energy system (IES) is considered as an effective means to improve efficiency and reduce carbon emissions. To further improve the efficiency and low-carbon benefits of IES, this paper proposes a novel low-carbon planning model for the electricity-gas-heat integrated energy system (EGHIES), in which a long-term, multi-stage planning approach is adopted for configuring energy production, conversion, storage equipment and transmission networks. This model mainly realizes the coupling and energy conversion of power, natural gas and heating systems through the combined heat and power (CHP). And the power-to-gas (P2G) model considering reaction heat is established and introduced into IES planning to deepen the coupling degree of the three subsystems, so as to improve the efficiency of P2G and the system. Considering it is difficult to effectively constrain carbon emissions with a fixed carbon trading price, this paper adopts a ladder-type carbon trading mechanism (LTCTM) to strengthen the effect on carbon emissions. To further improve the low-carbon benefits of IES, the carbon capture system (CCS) model installed in coal-fired generation (CG) and coal-fired boiler (CB) is established, and the CO2 captured by CCS is supplied to P2G for gas production. Finally, the effectiveness of the proposed model is verified by simulation results.
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