Research on control strategy of a multi-energy ship microgrid using diesel–battery rotation

Abstract

As an object of this paper, a multi-energy ship microgrid system is considered, according to the ship operation conditions and energy saving and emission reduction requirements. A rotational control scheme for a diesel generator and an energy storage device is proposed, which can achieve both grid-tied and off-grid control. Firstly, taking into account the characteristics of small capacity microgrid and AC load, a topology of ship AC microgrid is adopted, based on the state of charge (SOC) and net load, construct a power coordinated control strategy by which diesel generators and energy storage systems can be alternately used as the main power supply for the microgrid; Secondly, for different power supply modes, a dual-mode switching technology based on V/F control and PQ control is proposed, and a significant improvement has been made in the performance of the voltage and current loop. Lastly, using the topology of the ship’s AC microgrid, a model for simulation is built according to the proposed diesel–battery rotation strategy and dual-mode switching technology, and the four operating modes involved in ship operation are simulated and laboratory verified. According to the results, the control strategy designed is both feasible and effective.

Keywords

• Ship microgrid
• Diesel–battery rotation
• Technology for switching