Design and Analysis of New Harbour Grid Models to Facilitate Multiple Scenarios of Battery Charging and Onshore Supply for Modern Vessels
Abstract
:1. Introduction
- What are the suitable options for charging the batteries for the vessels?
- What are the key features and technical challenges of alternative methods for charging the batteries?
- How can these different charging scenarios be applied practically?
2. Charging Methods
3. Analysis of Multiple Battery-Charging Scenarios and Onshore Power Supply
3.1. Charging of Batteries Onshore—Slow Charging
3.2. Charging of Batteries Onboard—Fast Charging
3.2.1. Charging of Batteries with DC Power from Shoreside and a Separately Connected AC Onshore Power Supply
3.2.2. Charging of Batteries with a Shoreside AC Power Supply and a Separately Connected Onshore Power Supply
3.2.3. Charging of Batteries and Onshore Power Supply with Same AC Power Supply
3.3. Combination of Onshore and Onboard Charging of Batteries—Slow and Fast Charging
3.4. Characteristics of Main Charging Scenarios
3.5. Technical Challenges of Charging Scenarios
4. Simulation Study
5. Discussion
6. Conclusions and Outlook
Author Contributions
Funding
Acknowledgments
Conflicts of Interest
Abbreviations
AC | Alternating Current |
AES | All-Electric Ship |
BESS | Battery Energy Storage System |
CC/CV | Constant Current–Constant Voltage |
DC | Direct Current |
EU | European Union |
FC | Frequency Converter |
HVSC | High-Voltage Shore Connection |
HASG | Harbour Area Smart Grid |
IEC | International Electrotechnical Commission |
IEEE | Institute of Electrical and Electronics Engineers |
IMO | International Maritime Organization |
ISO | International Organization for Standardization |
PSCAD | Power Systems Computer-Aided Design |
PV | Photovoltaic |
SOC | State of Charge |
THD | Total Harmonic Distortion |
WT | Wind Turbine |
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Charging Scenarios | Advantages | Disadvantages |
---|---|---|
Charging of batteries onshore—slow charging Configuration A | Easy and flexible to implement. Low power required at shoreside with the slow/normal charging of batteries at shoreside as compared to all other configurations. Power cables, power electronic converters, chargers, switchgear and protection equipment for charging system will be of lower power capacity than the other configurations. Simple chargers are required and should not result in battery overheating. | Equipment and personnel required to move the battery containers. Higher capital cost because every harbour should have a sufficient number/capacity of batteries in containers to replace those in vessels being serviced. No space saving at the harbour area. Higher system downtime due to connecting/disconnecting of batteries; mechanical failure can occur. |
Charging of batteries onboard—fast charging Configurations B, C, D | Lower capital cost for batteries than configurations A and E: batteries remain onboard, with no exchange of discharged/charged batteries. Less space is required on shoreside as compared to configurations A and E. No equipment required to move battery containers as compared to configuration A. | Higher power required on shoreside as compared to configurations A and E. Power cables, converters, chargers, switchgear and protection equipment for charging system will be of higher power capacity than for configurations A or E. As the charging rate increases, the danger of overcharging and overheating also increases. Higher energy density batteries and compact onboard chargers are needed. More space and weight onboard the vessel are required in configurations C and D for the extra transformer on the vessel for charging the batteries. Transformer onboard poses a risk of fire so that physical isolation may be required. |
Combination of onshore and onboard charging of batteries—slow and fast charging Configuration E | Lower power required at shoreside than configurations B, C and D. Power cables, power electronic converters, chargers, switchgear and protection equipment for charging system on shoreside will be of lower power capacity than for configurations B, C and D. No equipment required to move battery containers as compared to configuration A. This configuration may be suitable if a hybrid microgrid with AC and DC buses is designed. | Configuration E has almost the same disadvantages as configuration A, except there is no need for equipment to move battery containers and no risk from connecting/disconnecting of batteries. Configuration E has more or less the same disadvantages as those of fast charging configurations (B, C and D) excluding the need for transformer onboard. |
Entities | Nominal Values | Measured Values |
---|---|---|
Main Grid Voltage | 110 kV | 110 kV (Constant) |
Main Grid Voltage | 20 kV | 20.88 kV (Maximum) |
Harbour Bus Voltage | 20 kV | 21.15 kV (Maximum) |
Harbour Bus Voltage | 0.69 kV | 0.72–0.74 kV |
Port Bus Voltage | 0.69 kV | 0.71–0.74 kV |
Onshore Bus Voltage | 6.6 kV | 6.4–7.1 kV |
Battery Voltage | 0.6 kV | 0.678 kV (at 95% SOC) |
Battery Current | 290 A | 290 A |
Onshore Bus Frequency | 50 Hz | 50 Hz |
THD for Charger Current (%) | 5 % (Maximum Allowed) | 5 % |
THD for Charger Voltage (%) | 5 % (Maximum Allowed) | 1.19 % |
Entities | Nominal Values | Measured Values |
---|---|---|
Main Grid Voltage | 110 kV | 110 kV (Constant) |
Main Grid Voltage | 20 kV | 21.9 kV (Maximum) |
Harbour Bus Voltage | 20 kV | 21.7 kV (Maximum) |
Harbour Bus Voltage | 0.69 kV | 0.71–0.72 kV |
Port Bus Voltage | 0.69 kV | 0.66–0.69 kV |
Onshore Bus Voltage | 6.6 kV | 6.45–6.75 kV |
Battery Voltage | 0.6 kV | 0.7 kV (at 95% SOC) |
Battery current | 1450 A | 1450 A |
Onshore Bus Frequency | 50 Hz | 50 Hz |
THD for charger current (%) | 5 % (Maximum Allowed) | 1.386 % |
THD for charger voltage (%) | 5 % (Maximum Allowed) | 1.52 % |
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Kumar, J.; Memon, A.A.; Kumpulainen, L.; Kauhaniemi, K.; Palizban, O. Design and Analysis of New Harbour Grid Models to Facilitate Multiple Scenarios of Battery Charging and Onshore Supply for Modern Vessels. Energies 2019, 12, 2354. https://doi.org/10.3390/en12122354
Kumar J, Memon AA, Kumpulainen L, Kauhaniemi K, Palizban O. Design and Analysis of New Harbour Grid Models to Facilitate Multiple Scenarios of Battery Charging and Onshore Supply for Modern Vessels. Energies. 2019; 12(12):2354. https://doi.org/10.3390/en12122354
Chicago/Turabian StyleKumar, Jagdesh, Aushiq Ali Memon, Lauri Kumpulainen, Kimmo Kauhaniemi, and Omid Palizban. 2019. "Design and Analysis of New Harbour Grid Models to Facilitate Multiple Scenarios of Battery Charging and Onshore Supply for Modern Vessels" Energies 12, no. 12: 2354. https://doi.org/10.3390/en12122354