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HD Electrification Upgrade - Coggle Diagram
HD Electrification Upgrade
AC Input Solid-State Transformer
Input Specifications
HD Topside Spec: 4500VAC, 50/60Hz, 3-Phase
Target Spec
UHD3 Topside Spec: 6500VAC, 60Hz, 3-Phase
Optional Investigation
Upgrading to 6.5kV would enable higher power operation, but would require PDU and umbilical upgrades, which are likely out of scope for older HD systems.
Voltage drop can be as high as 15% (10% over umbilical, 5% over tether).
Vessel Supply
Tolerance to Miswiring
Swapped phases
Single phasing events
Poor Vessel Power Quality
Generator supplied 440-480VAC
Surge and Sag Tolerance
50/60Hz or Just 60Hz?
Other large vessel loads can generate poor quality power (cranes, bow thrusters,
Could input power quality data inform the subsea SST control?
Wye Input Configuration
Umbilical Spec
8.5mm^2 Wire Size, 3 Conductors
Typical Length: 3500m, 4500m, 5500m
(Add factor of cos(21) to account for 21 degree lay angle of conductors in cable).
Tether Spec
4mm^2 Wire, 3 Conductors
Typical Length: 425m, 850m, 1600m (uncommon)
(Add factor of cos(21) to account for 21 degree lay angle of conductors in cable).
Output Specifications
Voltage: ~550VDC, Thrusters indicate 580VDC Max
Output Power: 150kW peak.
This is more than the umbilical/tether can transmit
Primarily supplies inductive loads
Output bus capacitance?
Bus regeneration?
Safety
Galvanic Isolation
Insulation Monitoring
Creepage and Clearance Requirements
IT Grounding System
Thermal Protection
Cooling Requirements?
Seawater cooling is not always guaranteed, extended on-deck testing is oftentimes performed.
High Surface Temperature Warnings
Ensure all enclosure components are properly bonded.
Interface and Monitoring
Power Management
Needs development by SR controls team.
Input Measurement
Voltage and Current
Under/Overvoltage Protection
Output Measurement
Voltage and Current
Overvoltage Protection
Individual Output Overcurrent Protection
Individual Output Disconnect (Isolation) capability
Critical Component Temperature Sensing
Interface to Subsea Control System
SEANET Cable
26VDC
100Mbps Ethernet
IPDS 4160 -> 26VDC control power circuit will be available. Does not need to be self-powered from the input.
Key Sub-Components
Input PFC Stage
Define multi-level converter architecture
HVDC Chopper Stage
High Frequency Magnetics
LV Rectification Stage
Output Regulation Stage
Control
DSP or FPGA Hardware Requirements?
Component Availability
SiC MOSFETs
SiC MOSFET Driver
DSP/FPGA
Isolation Control Components
Optical Gate Drivers
Isolated Power Supplies
Common silicon components
Architecture
Modularity? 50kW Parallelable Modules?
Physical Outputs
8 to 10 Individual 550VDC Outputs
7 for Thrusters
1 for Auxiliary HPU
2 Spare Output Circuits?
Thruster Requirements
Comms
CAN (Point to Point)
Voltage
580VDC Max
12VDC Control Power
Current
~60A Peak
Standard product has two Subconn connectors, one for 550VDC, one for control.
Aux HPU Requirements
Needs more definition.. Requires about 50HP of hydraulic power.
Environmental Requirements
Thermal
-20 to 45C Operational Temperature Range
60C Storage
Vibration
Meet Schilling Use Case Spec
Pressure
10,250PSI Target Test Pressure (6000m Depth Rating)
Chemical
Mineral oil compatibility
Tellus or Royal Purple Oil
Auxiliary HPU Motor/Pump
Power
50HP Total
5HP, 4000PSI for Manipulators
45HP, 4000PSI for Tooling
Clean vs Dirty Hydraulics?
User Experience
Troubleshooting
What diagnostics need to be supplied to the user?
Does the user need to control anything?
New Aux HPU Control Page? Similar to existing HPU Control Settings