Karl Gebrael
TU Braunschweig
June 26, 2019
Photo by Antony Hansen
Summary
• Production Line Overview
• THE Platform
• Systems of an Offshore HVDC Platform
• Integrated Control and Monitoring System• Function
• Subsystems
• Architecture
• Automation Concept
• Operation Levels
• Automation System Components
• Automation Hardware
• Redundancy
• Fire Fighting System• System Architecture
• Operation Philosophy
• Fire Detection Components
• Water Fire Fighting System
• Inert Gas System
• Heating, Ventilation, and Air Conditioning • Function
• Components
• Sea Water System
• Hypochlorite Plant
• Fresh Water Cooling System
• Centralized Chilled Water Cooling
• Chilled Water Freeze Plant
• Ducting in HVDC rooms
Production Line Overview
THE Platform
Cooling
•HVAC
•Sea Water
•Fresh Water Lighting and
power
communication
•CCTV
•PAGA
•Telephone
•Radio
•Internet Network
Protection•Fire detection
•Fire Fighting
Platform
•Structure
•Accommodation
•Drains
•Marine systems
•Helideck
Power
•Fuel system
•Diesel Generators
•Distribution transformers
•Switchboard
•UPS (230VAC and 110VDC)
ICMS
HVDC Converter
TransformersGISReactorsProtection & ControlSCADA
Systems of an Offshore HVDC Platform
Integrated Control and Monitoring System
ICMS - Function
• Main automation system on the platform
• Consists of 5 different subsystems in 5 automation areas
• Fully redundant – single fault tolerant
• Allows remote access from onshore stations
• Security: authorized access, firewall configuration, antivirus software
ICMS - Subsystems
IMAC
• Drain system
• Fuel system
• Instrument air compressor
• Potable water (RO, UV, calorifier)
• Sewage treatment
• Monitoring systems (telephone, CCTV, PAGA…)
• Marine systems (nav. Aids, AIS, helideck lighting…)
PMS
• MV switchboard
• premagnetization
• LV switchboard
• Distribution transformers
• Emergency switchboard
• UPS
HVAC
• HVAC technical rooms
• HVAC accommodation
• Sea water system
• Fresh water system
• Hypochlorite package
FIFI
• Fire detection system
• Gas detection system
• Fire water pumps
• Gas extinguishing areas
ESD
• Emergency shutdown
• Process shutdown
• Man Over Board
ICMS - Architecture
ICMS - Automation Concept
• 1st level: Platform automation system, handles the platform auxiliary systems
• 2nd level: SCADA system, handles the HVDC system, visualizes and operates the auxiliary systems
ICMS - Operation Levels
• Local control: directly at the equipment itself (pump, fan…)
• Station control – manual: subsystem is operated on SCADA operator station via screen commands, status is indicated on the screen
• Station control – automatic: subsystem is operated automatically depending on detected status via PLC, status is indicated on the screen
• Remote control: limited commands and statuses via IEC 60870-5-104. main operation for the 10kV platform supply.
ICMS - Automation System Components
• Control cabinets
• Server cabinets
• Engineering station
• Remote input/output cabinets
• Cables (FO, copper…)
• Field transmitters and actuators
• Package PLC/RTU
ICMS - Automation Hardware
• Power supply:
• chopper units with redundancy modules – redundant stabilized 24VDC
• Control:
• CPU with synchronization modules – fault-tolerant and fail-safe
• Ethernet card – allows the connection to industrial ethernet
• Distributed I/O DP slave – consists of IM and I/O cards
• Communication:
• Industrial ethernet switches – distributed to establish the ICMS network
• Optical/electrical converters – connect the distribution FO cables to the copper cables inside the cabinet
• Y-link – used to connect I/O devices with one DP interface to a redundant system
ICMS - Automation Hardware
ICMS - Redundancy
• Control
• 2 CPUs for each subsystem – in different locations
• Power supply
• 2 110VDC supply for each cabinet – different UPS – different cable routing
• 2 110V/24VDC power supply units with redundancy module
• Communication
• Double Profibus-DP ring (FO)
• 2 optical/electrical converters (FO to RS485)
• 2 I/O interface modules
Fire Fighting System
FiFi - System Architecture
FiFi –Operation Philosophy
FiFi - Fire Detection Components
Smoke detectors
optical type
based on the light scattering principle
flaming fires due to the combustion of
liquid or solid materials.
common spaces, corridors, mechanical
rooms…
IR Flame detectors
Hot carbon dioxide in a specific flame
wavelength
rooms with chemical storage (fuel tanks, diesel generators,
paint store)
Linear heat
detectors
Change of the resistance of
electrical conductor due to rise in temperature
Transformers rooms
Gas detectors
Electrochemical, infrared, MOS
For H2 and SF6
Hypochlorite and battery rooms
GIS rooms
Aspiration smoke
detectors
Pipe network with holes, aspirator, filter
and detection chamber
Critical rooms: converter,
transformer, GIS, reactor, generator
FiFi - Water Fire fighting Systems
• Redundant tanks and pumps system in separate rooms
• Normally supplied from fresh water system
• In case of depletion of fresh water, sea water bypass can be used
• Each tank is designed to supply the largest single fire scenario for 30 mins
• Jockey pumps are provided to maintain constant pressure in the system
FiFi - Water Fire fighting Systems
Foam
Used in transformer rooms
Activated manually or by heat detection
system
Sprinkler
Used in the accommodation and
office spaces
Activated manually, or by smoke detectors
Hydrants
Installed on helideck, accommodation, stores, machinery
spaces…
Fire water pump automatically runs when a hydrant is
activated
Water mist
Used in generator rooms
Activated manually, by flame and smoke
detectors
DIFFS
Installed on the helideck,
automatically pop up when pressurized
Activated manually, or by flame detectors
FiFi - Inert Gas System
• Non-liquefied inert gas (nitrogen) reduces oxygen content in the extinguishing zone
• 80l 300bar bottles stored in temperature controlled room
• Bottles grouped in combinations depending on extinguishing zones sizes
• HVDC and auxiliary transformer rooms and control rooms protected
• Extinguishing zones must be air-tight
• Operated by fire alarm, manual call point, ICMS.
Inert Gas Operation
Heating, Ventilation, and Air Conditioning
HVAC - Function
• dissipate the heat generated by HVDC equipment
• Ensure cooling of packages, such as ADG
• Provide fresh air for working areas
• Provide climate control for the accommodation
• React in case of fire to cut oxygen supply then flush the affected zones
HVAC - Components
• Sea water system
• Hypochlorite plant
• Fresh water cooling system
• Chilled water cooling system
• Chilled water freeze plant
• Ventilation system
HVAC - Sea Water System
• 4 lines, 2 groups
• Each line consists of 1 lift pump, 1 filter, 1 heat exchanger, and a connection to return line
• Multistage submersible Pump installed in well casing -16m MSL
• Filter is self-cleaning, removes particles bigger than 200m
• Heat exchanger is provided with provision for back flushing
• Automatic changeover happens in case of failure on one line, or if the running hours match 32 hrs or 24hrs
• Grouping ensures symmetrical electrical load and operating hours control
• SW system supplies potable water, sewage, deck wash, and fire fighting
HVAC - Hypochlorite plant
• Sodium hypochlorite is used as anti-fouling agent for prevention and control of marine growth
• Generated in situ from sea water
• Continuous dosing of 2ppm, shock dosing of 5ppm every 8hrs
• Excess can damage the SDSS material
• Package consists of booster pumps, rectifiers, electrolyzers, storage, dosing pump
• The hypochlorite room is protected by H2 gas detection
HVAC - Fresh Water Cooling System
• Provides multiple systems with cooling capacity:
• Transformers
• Converter cooling skid
• Auxiliary generators
• HVAC system
• Compensation reactor
• Outlet temperature is controlled by a 3-way control valve at the outlet of HE
HVAC - Centralized Chilled Water Cooling
• Produces and distributes chilled water to FCUs
• Consists of chillers and distribution pumps
HVAC - Chilled Water Freeze Plant
• Standalone plant
• Used for provision cooling room
Ducting in HVDC rooms
• Ducts shall not have sharp edges as it may cause partial discharge
• Rectangular ducts are acceptable with round edges
• All maintainable parts (dampers, sensors…) to be installed outside the HVDC rooms
• All bolts and nuts to be of locked type
• All ducting to be earthed
• All ducting to be outside of air clearance
• Air supply from below the converters and exhaust above them
Photo by Antony Hansen
Top Related