Abstract
This paper considers the case of a ship AC/DC smartgrid configured in the docked mode, where a 1 MW diesel-generator is in operation to supply the AC-side of the grid in addition to a battery-bank connected to the DC-side, and a 0.5MVA Voltage Source Converter (VSC) for bridging the two sides of the grid. In this configuration, three-phase power imbalance can easily occur due to unpredictable per-phase consumer-loads, causing generator torque, power-angle and voltage oscillations that lead to increased fuel consumption and potentially to premature failure. To overcome such a condition, the paper proposes a control method for the VSC which implements three power-controllers for re-balancing the loads on the rotating-generator. Firstly, it presents a fourth-order power-model for the VSC microgrid-connection and the DC-link, including a diesel-generator's electromechanical model. Then the model is expanded to allow the design and implementation of the power-controllers based on an inverse-model technique. This process also includes the analysis and design of integrated DC-link voltage and frequency-droop controllers, and a synthetic-inertia provider. Finally, the paper demonstrates the performance of the complete VSC control system and its parts through a detailed system simulation of the microgrid, which covers performance tests and analysis, demonstrating the elimination of generator torque oscillation.
Original language | English |
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Article number | 106200 |
Journal | Electric Power Systems Research |
Volume | 182 |
DOIs | |
Publication status | Published - May 2020 |
Bibliographical note
Funding Information:F. Hardan gratefully acknowledges the sponsorship granted by Newcastle University for his academic fellowship, and the award of this fellowship through CARA programme in London, UK.
Publisher Copyright:
© 2020 Elsevier B.V.
Keywords
- Power control
- Ship power system
- Smartgrid/Microgrid
- Synthetic inertia
- Unbalanced load
- Voltage source converter (VSC)
ASJC Scopus subject areas
- Energy Engineering and Power Technology
- Electrical and Electronic Engineering