Abstract
Combining new energy technology with electric propulsion technology is an effective way to decrease the pollution of water resources caused by cruise ships. This study examines the stable parallel operation of a ship’s micro-grid system through a dynamic power management strategy involving a step change in load. With cruise ships in mind, we construct a micro-grid system consisting of photovoltaics (PV), a diesel generator (DG), and a lithium battery and establish a corresponding simulation model. We then analyze the system’s operating characteristics under different working conditions and present the mechanisms that influence the power quality of the ship’s micro-grid system. Based on an analysis of the power distribution requirements under different working conditions, we design a power allocation strategy for the micro-grid system. We then propose an optimization allocation strategy for dynamic power based on fuzzy control and a load current feed-forward method, and finally, we simulate the whole system. Through this study we prove that the proposed power management strategy not only verifies the feasibility and correctness of the ship’s micro-grid structure and control strategy, but also greatly improves the reliability and stability of the ship’s operation.
Highlights
To comply with the requirements of the energy efficiency design index (EEDI), the shipping industry must find ways to reduce its emissions of greenhouse gases
The main (PQ), operation constant voltage frequency (V/f),can and Depending on the requirements of different operation modes, different control algorithms can be selected to match each purpose of this paper is to investigate the best operation mode for parallel inverters and better mode
The output power is determined by the maximum power point tracking (MPPT) algorithm, and the power-frequency characteristic of the solar inverter is shown in curve 3 of Figure 11
Summary
To comply with the requirements of the energy efficiency design index (EEDI), the shipping industry must find ways to reduce its emissions of greenhouse gases. Yu et al had developed multi-energy ship micro-grid energy control system based on solar lithium battery and diesel generator set for cruise ships and proposed the energy distribution control strategy according to the requirements of safe and stable operation, and they had verified the feasibilities on the actual ships [21,22]. The battery state of charge (SOC) was divided into three different states, in which SOC > SOChigh , SOClow < SOC < SOChigh , and SOC < SOClow They proposed the different energy management strategies in different states, for that the diesel generators, energy storage systems, and fuel cells were rationally utilized. Ding et al proposed a method based on fuzzy control strategy for battery energy storage system to improve the transient stability of power grid at when the input of fuzzy controller had the problem of frequency difference [26].
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