Abstract
Due the concern about serious environmental pollution and fossil energy consumption, introducing solar generation into ship power systems has drawn greater attention. However, the penetration of solar energy will result in ship power system instability caused by the uncertainties of the solar irradiation. Unlike on land, the power generated by photovoltaic (PV) modules on the shipboard changes as the ship rolls. In this paper, a high-speed flywheel energy storage system (FESS) is modeled to smooth the PV power fluctuations and improve the power quality on a large oil tanker which contains a PV generation system, a diesel generator, a FESS, and various types of ship loads. Furthermore, constant torque angle control method combined with sinusoidal pulse width modulation (SPWM) approach is proposed to control the FESS charging and discharging. Different ship operating situations and the impact of the ship rolling is taken into consideration. The simulation results demonstrate the high efficiency and fast response of the flywheel energy storage system to enhance the stability of the proposed hybrid ship power system.
Highlights
Owing to the ever increasing amount of greenhouse gas and the consumption of fossil energy by ship systems, strict restrictions have recently been imposed by the International Convention for the Prevention of Pollution from Ships (MARPOL) [1] to limit the collective emissions of greenhouse gas produced by ships
Thisa paper proposes based a maximum power strategy point tracking (MPPT) approach for theconverter; PV boost and a constant torque angle control combined with converter; a DQ decoupling based on PQ control strategy for bidirectional grid-connected converter; and a constant torque angle control combined with sinusoidal pulse width modulation (SPWM) for flywheel energy storage system (FESS)
The PV module generated power feeding to the load is going through a regulated converter and power point of the PV system based on PWM signal generated by control unit [27]
Summary
Owing to the ever increasing amount of greenhouse gas and the consumption of fossil energy by ship systems, strict restrictions have recently been imposed by the International Convention for the Prevention of Pollution from Ships (MARPOL) [1] to limit the collective emissions of greenhouse gas produced by ships. A wide range of investigations [12,13,14,15,16,17,18] have been performed regarding the application of FESSs. In [12], the authors analyzed a hybrid energy system performance with PV modules and diesel systems as well as an ESS, and the FESS is equipped to store excess energy from the PV generation system. A hybrid PV/diesel/FESS ship power system is set up based on the project “Study on the Application of Photovoltaic Technology in the Oil Tanker Ship” in China [22]. A high-speed flywheel energy storage system is modeled for smoothing the fluctuations generated by a shipboard PV system, including a permanent magnet synchronous motor (PMSM) and a bidirectional converter.
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