Post-Disaster Restoration Of Ship-Port Interconnected Energy System Considering All-Electric Ships

As a high-tech ship,the all-electric ship has the inherent advantages of "zero emission" and low vibration and noise pollution,which is an important means to realize the sustainable development of shipping industry and the goal of "double carbon" policy,and has broad application prospect and important strategic significance.In response to the "double carbon" policy and the "13th Five-Year Plan",China’s shore power application has already covered many ports in the south and east.As the "lifeline project" of the port,the shore power system is affected by the frequent occurrence of extreme weather,deliberate attacks and other adverse circumstances,facing unprecedented challenges,directly or indirectly threatening the safety of ship cargo and navigation security.In order to provide timely post-disaster relief to ensure maritime safety and maritime economy,and to prevent strong chain reaction after the disaster,under the double-wheel drive of electric safety and environmental protection,all-electric ships with flexibility,large power storage capacity and diversified energy utilization are incorporated into the post-disaster reconstruction of ports,and energy optimization and dispatch in the form of ship-port interconnection is established to make up for the shortage of energy supply after the disaster and provide effective post-disaster safety and economy.It protects,extends the application scope of ships,expands the functions of ships,gives full play to the value of all-electric ships,and realizes the integration of energy-transportation,which is a cross-sectional field that cannot be ignored by future shipping.Considering the plug-and-play,shared and open characteristics of all-electric ships and the conversion from end-load to production and sales,the energy dispatching mode is changed to "point-to-point" mode and an optimization model is built.As the arithmetic power of all-electric ships increases and the port center fades,the energy system optimization and scheduling strategy gradually shifts to a distributed optimization and scheduling strategy.This dissertation aims to avoid the Lagrange multiplier operator to reduce the computational difficulty caused by the inequality constraint,and proposes a distributed optimal scheduling scheme for the projection of energy parameters of ship-port interconnection,so that the energy system of the affected port can be restored and optimized while ensuring the stable and safe operation of all-powered ships,and finally the resilience and flexibility of the ship-port interconnection system can be doubly improved.The main contents of this dissertation are as follows:1.According to the characteristics of all-electric ship production and marketing,considering the specific environment of the port,making full use of the advantages of flexible transportation,"zero emission" and diversified energy utilization of all-electric ships to make up for the shortage of shore power energy supply,and proposing an AESs-port interconnection post-disaster joint energy dispatching plan,increasing the resilience of shore power while taking into account the green requirements of the port energy system.2.Taking into account the cost of user interruption after the disaster,the transportation cost of all electric ships and the maintenance cost of the energy storage system,taking into account the load classification,build a dispatching model of the ship-port interconnected energy system after the disaster,and establish a constraint model for the overall and internal distributed energy supply system and energy storage system of the ship-port interconnected energy system from the three aspects of port,all electric ships and transportation to ensure the normal operation conditions.The port load recovery is described to evaluate the necessity and feasibility of all electric ships participating in the post-disaster reconstruction of the port.3.Considering that the computing power of the port energy dispatching center is limited,and the all-electric ship also has an energy dispatching center,both the all-electric ship and the port are regarded as intelligent agents,and the single body computing power is fully used for the distributed optimization scheduling of the ship-port interconnection system energy.In order to reduce the computational dimension,the distributed optimization algorithm based on parametric projection is used to avoid the Lagrange multiplier operator and improve the convergence speed of the algorithm.