1.School of Electrical and Information Engineering, Southwest Petroleum University, Chengdu 610500, China;2.School of Engineering, Cardiff University, Cardiff CF24 3AA, UK

Offshore micro integrated energy systems are the foundation of offshore oil and gas engineering. In order to reasonably evaluate operation risks and ensure the safe development of marine resources, this paper proposes a risk assessment scheme for offshore micro integrated energy system based on the analysis of matter-energy flow. By adopting a two-state Markov model for the key equipment to describe its on-off status, risk impact factors are introduced. Then a risk output model is built, and the matter-energy conversion relationship of the output equipment under risk is analyzed. A risk transfer model based on the generalized matter-energy flow model is proposed to describe the dynamic behavior of risk in the system from the perspective of matter-energy flow. In addition, according to the system structure and operation characteristics, a risk index for micro integrated energy system and its evaluation procedure are designed. Taking an offshore oil and gas platform in the Bohai Sea of China as an example, simulation experiments are performed to verify the effectiveness and rationality of the proposed model and method.