Multi-objective hierarchical optimization strategy of PV-hydrogen-gas integrated energy system based on branch bounding method

For the power generation-side high-proportion renewable energy system based on electro-hydrogen collaborative technology, the contradictory relationship is hard to balance between economic benefits and environmental benefits in the optimal design. Detailed analysis and evaluation of its comprehensive performance is a key scientific issue that needs to be urgently addressed. The sensitivity of the constructed integrated energy system to government policies (such as energy price policies and carbon tax policies) are an important factor. Therefore, this paper builds a photohydrogen-gas integrated energy system model coupled with electro-hydrogen collaborative technology firstly. Secondly, a multi-objective hierarchical optimization method is proposed considering different priority strategies. Thirdly, the feasibility of promoting emission reduction by formulating natural gas and carbon tax pricing schemes is analyzed. Finally, the simulation example proves that the proposed system, based on the electro-hydrogen collaborative strategy and making rational use of the energy storage advantages of green hydrogen, has strong renewable energy consumption capacity, providing a theoretical basis for green hydrogen technology to help the consumption of renewable energy on the power generation side.