MEGA GUARD Electrical Energy Storage System
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The Company
⚫ Product and System provider for
Commercial vessels, Workboats, Mega
yachts and Navy ships
⚫ Manufacturer of engine room and bridge
automation systems
⚫ New product line for electric and Hybrid
propulsion – Green propulsion
⚫ More than 50 years experience, supplying
more than 4000 shipsets
Praxis Automation – Leiderdorp – The Netherlands
⚫ Company Movie
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Electrical Energy Storage System
▪ Overview:
▪ Introduction to the EESS and Operational
Guidelines
▪ Objective:
▪ To familiarize engineers with the
components, functionality, and operation of
the EESS
▪ Presenter:
▪ Joel Landivar – Electric Propulsion Project
Engineer
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Outline
⚫ Installed System
⚫ System components
⚫ BMS functional description
⚫ Charging procedure
⚫ Maintenance
Automation, Navigation and Electric Propulsion
Outline
⚫ Installed System
⚫ System components
⚫ BMS functional description
⚫ Charging procedure
⚫ Maintenance
Automation, Navigation and Electric Propulsion
Installed System Components
⚫ System:
4 Battery Racks distributed into 2 DC buses
Two servers (MPC) and 2 Ethernet switches
for communication with the external
Energy/Power Management System
Modbus communication interface for
operational data and alarms
Battery Management System (BMS) unit per
rack
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Installed System Components
MPC SWITCH
Control Cabinet
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Outline
⚫ Installed System
⚫ System components
⚫ BMS functional description
⚫ Charging procedure
⚫ Maintenance
Automation, Navigation and Electric Propulsion
Installed System Components
⚫ Battery Rack HV Filter
1 BMS module per rack
1 HV filter per rack
10 battery modules
96VDC per module
10 KWh per module
Two communication channels
BMS
Battery
Module
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Installed System Components
⚫ Battery module
1 BMS module per rack
1 HV filter per rack
10 battery modules
96VDC per module
10 KWh per module
Two communication channels
In/Out comm HV Terminals
port
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System Components
⚫ Battery Management System (BMS):
One in every battery Rack
Has an operator panel with 5.7” touch screen and
6 buttons
Manages up to 10 battery modules, handles data
exchange and safety monitoring
Shows dynamic information of the whole rack
❑ Cell voltages and temperatures
❑ SoC and SoH
❑ Total rack voltage
❑ DC bus voltage
❑ Charging/Discharging current
❑ Contactor status
❑ Cooling valve status
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System Components
⚫ Battery Management System (BMS):
One in every battery Rack
Has an operator panel with 5.7” touch screen and
6 buttons
Manages up to 10 battery modules, handles data
exchange and safety monitoring
Shows dynamic information of the whole rack
❑ Cell voltages and temperatures
❑ SoC and SoH
❑ Total rack voltage
❑ DC bus voltage
❑ Charging/Discharging current
❑ Contactor status
❑ Cooling valve status
Automation, Navigation and Electric Propulsion
Outline
⚫ Installed System
⚫ System components
⚫ BMS functional description
⚫ Charging procedure
⚫ Maintenance
Automation, Navigation and Electric Propulsion
Functional Description
⚫ BMS Main page’s on-screen buttons:
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Functional Description
⚫ BMS Rack Summary page:
Alarm Line
Rack SOC
Rack current
Rack voltage
Rack insulation status
Battery module summary:
➢ Avg, max, min voltage
➢ Avg, max, min temperatura
➢ SoH
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Functional Description
⚫ BMS Battery Details page:
Alarm Line
Rack SOC
Rack current
Rack voltage
Rack insulation status
Battery module number
Battery module SoH
Avg, max, min voltage
Individual cell voltages
Avg, max, min temperatures
16 temperature measurements
Cell balancing indication
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Functional Description
⚫ BMS Main Page:
Contactor Open/Close button
Contactor status indicator
Rack SoC indicator
Rack current indicator
Rack voltage indicator
DC Bus voltage indicator
EM-STOP indicator
Estimated disch./charge time
Rack’s cooling valve indicator
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Functional Description
⚫ BMS Main Page:
User SoC
Rack’s DC voltage
(before contactor)
Rack’s current
Estimated time to
Charge/discharge
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Functional Description
⚫ BMS Main Page:
DC BUS voltage
(after contactor)
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Functional Description
⚫ BMS Main Page:
Cooling valve status
Rack’s cell voltages Rack’s temperatures
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Functional Description
⚫ BMS Main Page:
➢ The recommended operational temperature for the ESS is 25 to 30 °C
➢ In higher temperatures, the performance will not be greatly affected, however aging effect increases
➢ On high temperatures the cooling system must be active at all times.
➢ In lower temperatures, the overall performance of the batteries is reduced as well as the lifetime
➢ At zero °C the batteries can be discharged with low currents but they cannot be charged at all
➢ When current is >50A, cooling must be ON
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Functional Description
⚫ BMS Contactor button: ⚫ BMS Contactor indicators:
CONTACTOR OPEN; PRESS TO CLOSE BMS CONTACTOR OPEN;
BATTERIES DISCONNECTED
CONTACTOR BLOCKED;
WAIT 30 SECS TO CLOSE
BMS CONTACTOR CLOSED;
BATTERIES CONNECTED TO
CONTACTOR CLOSING DC BUS
CONTACTOR CLOSED; PRESS TO
DISCONNECT
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Functional Description
⚫ BMS Contactor:
ONLY OPEN THE CONTACTOR WHEN THERE IS NO CURRENT FLOWING
FROM/TO THE BATTERIES.
ALL CONVERTERS/LOADS SHOULD BE STOPPED BEFORE OPENING/CLOSING
THE BMS CONTACTOR.
PRECHARGE THE DC BUS BEFORE CLOSING THE BMS CONTACTOR. FAILURE TO
PRECHARGE THE DC BUS CAN DAMAGE PERMANENTLY THE BMS CONTACTOR
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Functional Description
⚫ BMS Alarm page:
Alarms with tag, description and status
Steady red line:
➢ Accepted and active alarm
➢ Status text: alarm
Flashing red line:
➢ Un-accepted and active alarm
➢ Status text: alarm
Flashing red line:
➢ Un-accepted no longer active alarm
➢ Status text: normal
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Functional Description
⚫ BMS Alarm page:
➢ Alarms that trip the BMS
contactor can only be
accepted from BMS’s screen
➢ Press accept button for 5
seconds
➢ Once alarms are cleared, 30
seconds shall pass until the
contactor can be closed again
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Functional Description
⚫ BMS Alarm page:
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Outline
⚫ Installed System
⚫ System components
⚫ BMS functional description
⚫ Charging procedure
⚫ Maintenance
Automation, Navigation and Electric Propulsion
CHARGING PROCEDURE
⚫ Procedure for connecting batteries to DC Bus:
1. Pre-charge DC Bus. Never connect the batteries to a 0 VDC Bus (dead Bus)
2. Voltage difference between DC Bus and rack should be LESS than 5% of DC Bus voltage
3. Adjust DC Bus voltage so it is within the 5% of the lowest voltage rack
4. The DC bus should not be charging nor discharging when closing the contactor
5. Close the contactor of the lowest voltage rack first (ONLY if the voltage is within 5%)
6. Continue by closing the contactor of the second lowest voltage rack (raise DC bus voltage if needed)
7. Repeat the previous step until all the racks are connected to the DC Bus
It is recommended that the battery system is charged to full (100%
SoC) at least once a week to reduce unbalance between racks and
errors on the SoC estimation.
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CHARGING PROCEDURE
⚫ BMS power control and charging
process:
BMS monitors batteries and provides a
power limit for charging (at constant
Charge current Charge till first cell reaches New charge current
current) 1C – 0.6C 3.44V 0.5C (5kW for each battery module)
Batteries charge at 1C until user SoC is 0.6C - 0.3C 3.47V 0.25C (2.5kW for each battery module)
90% (highest voltage cell is at 3.44V) 0.3C – 0.15C 3.48V 0.1C (1kW for each battery module)
0.15C – 0C 3.49V Stop Charging
After 90% SoC is reached, the BMS
reduces the charging power
When highest voltage cell is 3.49V the
charging stops and SoC is 100%
It is recommended that the battery system is charged to full (100%
SoC) at least once a week to reduce unbalance between racks and
errors on the SoC estimation.
Automation, Navigation and Electric Propulsion
Outline
⚫ Installed System
⚫ System components
⚫ BMS functional description
⚫ Charging procedure
⚫ Maintenance
Automation, Navigation and Electric Propulsion
MAINTENANCE
NEGATIVE
⚫ HV cables
Batteries are connected in
series.
Negative terminal is
connected to the positive of
the next battery
POSITIVE
+
ONLY disconnect batteries if
there is NO current flowing
in the rack
FOR SAFETY press EM STOP
button before disconnecting
or connecting HV cables -
HV connectors have a HVIL
pin. Make sure connector is
+
fully inserted.
-
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MAINTENANCE
⚫ Communication cables
CHANNEL A
CHANNEL B
END OF LINE
RESISTOR
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MAINTENANCE
⚫ Communication cables
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MAINTENANCE
⚫ Power Supply
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MAINTENANCE
⚫ Modbus Interface
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Questions
Questions?
Thank you.
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Extras
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Extras
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