Page 84 - Read Online

Page 8 of 15 Li et al. Complex Eng Syst 2023;3:1 https://dx.doi.org/10.20517/ces.2022.46

Table 1. Comparison of microgrid structure
DC AC AC/DC
Advantage Simple renewable energy grid, high Long-distance transmission and voltage conversion are Suitable for a variety of
reliability and efficiency, simple convenient, power generation equipment is simple, and renewable energy generation
control arc is easy to extinguish
Disadvantage The development of DC microgrid Complex to control and use The cost is high, the structure
protection and grounding technology is complex, and the control is
is limited difficult

Figure 2. Marine propulsion system based on DC shore power.

method for large-scale new energy access , and proposed a joint optimization model that comprehensively
[31]
considered the output characteristics of energy storage power sources, DC grid transmission capacity, and
new energy generation constraints. Ju et al. proposed a two-tier robust wind and firewood storage capacity
[32]
planning model by comprehensively considering the cost parameters , wind energy resource uncertainty,
and standby demand in the planning process of independent microgrids. Aiming to solve the typical day
selection problem of microgrid capacity planning, Zhong et al. and Guo et al. constructed a comprehensive
evaluation index system for typical day selection and proposed a two-stage planning capacity allocation
method [33,34] .

The first result of the OptimaGRID project determines the scale of renewable resources based on the
availability and local needs of renewable energy resources . The design is suitable for a microgrid in the
[35]
Tanos area of Bayonne Port, which contains a 150 KW photovoltaic array and two 50 KW wind turbines.
The 800 KWh REDOX battery has a maximum power of 126.6 kW and an annual energy of 96 MWh.
Finally, HOMER and EUROSTAG software are used to determine whether the amount of the microgrid
power supply meets the demand of the port and test its dynamic operation. But the system cannot meet the
requirements of cold ironing. In order to ensure the continuity of service, Parise et al. compare the structure
[36]
of microgrid and the layout of power generation system , so as to ensure the power supply of critical loads
in emergency situations in terms of energy management. The power grid includes photovoltaic and wind
power generation equipment, with an annual energy of 150-200 MWh and a maximum power of 140 MW.
Gennitsaris and Kanellos proposed a multi-agent real-time demand side management system (including
[37]
reefer containers, berth ships, wind turbines, etc.) applicable to cold ironing of freezers in commercial ports