Operation optimization for integrated energy system based on hybrid CSP-CHP considering power-to-gas technology and carbon capture system

Abstract

To alleviate the negative influence caused by curtailment of renewable energy resulting from the “power determined by heat” of CHP, recent studies have proposed hybrid concentrated solar power and combined heat and power (CSP-CHP) to provide additional flexibility to power system to reduce renewable energy curtailment. However, for the power system with high wind power penetration in the future, hybrid CSP-CHP can only partially absorb wind power, and the CO2 emission from isolated CHP can also cause environmental pollution. Therefore, this paper extends the coupled power to gas (P2G) and carbon capture and storage (CCS) technologies to the hybrid CSP-CHP integrated energy system (IES), aiming to accommodate more wind power and further reduce CO2 emissions. First, the operation mechanism and mathematical model of the proposed integrated energy system are developed. Second, considering the increase in wind power permeability, a low carbon economic dispatch model to minimize economic cost is presented to optimize the proposed IES operation. Finally, in order to verify the validity of the proposed IES, different cases are compared in the simulation. The simulation result shows that the proposed IES has an excellent performance in wind power absorption and CO2 emission reduction. The proposed model emission is less than the base case by 72.4%, and greatly improve the level of wind power absorption.