Low-carbon economic dispatch of a hydrogen-based integrated energy system considering the coordinated operation of CHP-ORC-CSP and P2G-CCS

In the context of “dual-carbon” aims, tackling the intermittent nature of renewable energy and the high carbon emissions from fossil-fuel-based generation is crucial to developing sustainable energy optimization systems. This paper offers a low-carbon optimization model for integrated energy systems (IES), integrating a multi-energy complementary operating mechanism with a reward-penalty ladder carbon trading technique to increase source-load interaction and build low-carbon coupling routes. First, a flexible Combined Heat and Power-Organic Rankine Cycle-Concentrated Solar Power (CHP-ORC-CSP) operating framework is designed to increase the dispatchability of the combined heat and power (CHP) system by combining Organic Rankine Cycle (ORC) and Concentrating Solar Power (CSP) technologies, therefore minimizing wind and solar curtailment. Second, an integrated P2G-CCS approach is presented to increase carbon resource use in the power-to-gas (P2G) system and minimize carbon emissions from gas-fired units. Additionally, an electrolyzer model, accounting for various operating conditions, is established, and the multi-path hydrogen application is expanded to strengthen the system’s low-carbon scheduling capability. To limit carbon emissions, a reward-penalty ladder-based carbon trading mechanism (RPLCTM) is introduced to establish an economic-environmental coordination optimization framework. The objective is to minimize the energy procurement cost, carbon trading costs, and the losses due to wind and solar curtailment. The optimization is performed for five typical scenarios using the YALMIP toolbox and CPLEX solver on the MATLAB platform. Simulation results demonstrate that the model reduces the system’s total operating cost by 30.46% and carbon emissions by 33.42%, confirming the method’s effectiveness and feasibility.