In the context of the dual carbon target

the "new energy+energy storage" joint system is rapidly developing in a multi market coupled trading environment. Energy storage devices are not only used to suppress the deviation of new energy output

but are also crucial in frequency regulation and peak shaving services in the auxiliary service market. To fully leverage the flexibility of energy storage in a multi market trading environment

this paper proposes a multi market coupled bidding strategy for a combined solar energy storage system that takes into account carbon reduction benefits. Firstly

consider the deviation of photovoltaic prediction and conduct a deviation assessment on it; Secondly

considering the benefits of CCER (China Certified Voluntary Emission Reduction) in the coupled carbon trading market and the benefits of green electricity in the green electricity market

a mathematical model was established with the objective function of maximizing the total benefits of the solar energy storage joint system in the energy market

auxiliary service market

and carbon market

and solved using the CPLEX solver. Through case analysis

it is shown that the participation of the photovoltaic energy storage joint system in the bidding method of multiple market coupling increases the system revenue by 11.6% and 10.5% respectively compared to participating in the carbon market or green electricity market alone. The energy storage devices configured in photovoltaics are also fully utilized.