Battery Storage for Charging, Grid Support and Island Operation in the Port of Gothenburg
Typ
Examensarbete för masterexamen
Program
Electric power engineering (MPEPO), MSc
Publicerad
2022
Författare
Benjaminsson, Andreas
Modellbyggare
Tidskriftstitel
ISSN
Volymtitel
Utgivare
Sammanfattning
Abstract
Environmental impacts of human actions have shown severe long–term consequences. In order to mitigate this effect, the current trend is a conversion from non–renewable sources of energy to substitutes that are more sustainable. The EU–funded project Sea Li–ion was initiated with the specific target of accelerating maritime electrification. The project investigates the idea of using Battery Energy Storage Systems
(BESS) in harbour areas with the primary application of charging electric ferries.Using the onshore BESS for charging of electric ferries alone limits the possible benefits of such a configuration. BESS can be used to provide ancillary grid services to increase system stability in frequency and voltage magnitude, as well as assist during times of high loading. Furthermore, it can be used in an islanded system configuration where a section of the power system is disconnected from the synchronous grid. This becomes particularly important should the main grid be subject to major disturbance or outage. This thesis investigates how a BESS can be used to support an isolated grid. An
islanded grid is modelled around the Port of Gothenburg, consisting of gas turbines from Rya combined heat and power plant, BESS and an electric ferry representing a load. The gas turbines serve as primary generation for the grid whereas the BESS impact on the grid performance is investigated. The BESS is modelled as a battery connected to a grid–forming converter as an interface to the islanded grid. A suitable control system is developed where the impact of different control parameters is investigated. The system performance without the
BESS and with the BESS installed is assessed to investigate the impact of a BESS in an islanded system configuration. Results show that the BESS possesses fast dynamics and can be efficiently used with conventional generating units to improve the initial frequency response during an event on the grid. Frequency oscillations can be mitigated by configuring the BESS control accordingly. BESS provides a major benefit of having a control structure that allows specific tuning, which can be used to target requirements of the grid in question.
Beskrivning
Ämne/nyckelord
Sea Li–ion , Battery Energy Storage System (BESS) , Second–life lithium , ion batteries , Electric ferry , Port of Gothenburg , Island operation , Grid–forming converter , Frequency support