Subsea Power Grid Control System
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1 Subsea Power Grid Control System Development Manager Offshore,Oil & Gas Integrated System Solutions Siemens Oil & Gas solutions - Offshore All rights reserved.
2 Contents Motivation for subsea power systems The subsea power grid concept Control system challenges and solutions Interfacing and use of standards Condition monitoring The power grid infrastructure Page Copyright Oil & Gas All rights reserved 2011
3 Power (MVA) Subsea power distribution is the key enabler for future power consuming subsea processing Subsea power is key enabler for subsea processing Enabling technologies Subsea power distribution technologies Standard Long distance Very long distance (Relative importance) DC Transmission Oil co s main focus AC Transmission kv Enabling technologies identified by operators as the ones required to make subsea processing widespread Getting reliable, field proven power distribution systems considered to be the most important enabler Source: Douglas Westwood, GE Oil & Gas, Arkwright research Page Distance, km AC is the key focus area today, while DC by most are put off for the next 3-5 years Technology risks are viewed to be manageable, and oil co s do not see any real show stoppers Copyright Oil & Gas All rights reserved 2011
4 Subsea Power Grid Roadmap Overview of subsea electrifications topologies ~ ~ ~ DC AC DC AC Topology M ~ ~ ~ ~ ~ ~ P M M M Point-to-point Long step-out point-to-point Small field electrification Large field electrification Long step-out large field electrification Ready by Currently used First projects (King) SAG: 2013 SAG: 2018 SAG: eyond 2020 Power consumers up to 10 up to 20 Step-out length (km) < < < > Voltage and power rating 1 4 MW Transmission & Distribution: ~6 kv 1 4 MW Transmission: ~36 kv Distribution: ~6 kv MW Transmission: ~50 kv Distribution: ~6 kv MW Transmission: ~100kV Distribution: ~6 kv MW Transmission ~100kV Distribution: ~6 kv Siemens scope Top-side VSD Subsea transformer 1), top-side VSD System design and subsea VSD, transformer, switchgear and control system System design and subsea VSD, transformer, switchgear and control system HVDC components, subsea VSD, transformer, switchgear Limitations Limited step out, one solution per consumer One solution per consumer, harmonic issues with VSD Limited number of consumers Very long step-outs None 1) Small transformer (<10 MVA) to be incorporated into subsea assembly Source: Subsea Future team Page Copyright Oil & Gas All rights reserved 2011
5 Todays Topologies Point-to-Point Gen VSD Motor Pump Page Copyright Oil & Gas All rights reserved 2011
6 Future Topologies Distribution system Gen Switchgear VSD Page M M M Copyright Oil & Gas All rights reserved 2011
7 Subsea Power Grid Components Step Down Transformer Control System Di-Electrical Fluid Double Shell Design Integration with leading control system solutions Switchgear (36kV/800A) Pressure Compensated ase Plate with atm. Canisters Wet-mate Connections Variable Speed Drive Pressure Compensated Integrated Input Transformer Natural Cooling Page Copyright Oil & Gas All rights reserved 2011
8 VSD General Concept ased on Siemens Perfect Harmony topology Redundancy incorporated in design Pressurized and fluid-filled power circuit Low diff. pressure for all penetrations Thin enclosure walls Compact and lightweight etter cooling conditions than 1 atm canister Control systems in separate canisters Cooling based on natural convection Design depth 3000 meters 6 MVA Output Power for pilot Page Copyright Oil & Gas All rights reserved 2011
9 36 kv Subsea switchgear Switchgear module mechanical design overview asis: Two standard SF 6 insulated vacuum breakers with it s normal 1.5 bar pressure mounted inside pressure resistant canisters. Page Switching and protection functions: Circuit reakers Redundant protection Relays Redundant precharge transformers and switches Redundant control power transformers and switches Copyright Oil & Gas All rights reserved 2011
10 Challenges of control of a Subsea Power Grid High availability and reliability Flexible size and scalability of grid Coordination of distributed components Fast response to commands and failures High number of (different) interfaces Page Copyright Oil & Gas All rights reserved 2011
11 Grid control topology UTH Key characteristics Redundant system Two level node hierarchy Main control node (EPCU) Local interface nodes () Flexible control topology Autonomous system Standard Interfaces Extensive monitoring and calculation of KPIs A EPCU A Transformer A Switchgear Unit - SSU A A A EPCU A Power Channel A communication Channel communication SIIS level 2, 3rd party communication interface Power Cable with fiber optic communication line VSD VSD VSD VSD Page EPCU Electric Power Control Unit Remote Terminal Unit Process system Subsea Process Control Copyright Oil & Gas All rights reserved 2011
12 Cross connections to increase availability To topside system Channel A Channel EPCU A SW A SW EPCU Cross Connection (optional) SSU A SSU VSD A VSD Protec. Relay Relay A 1A Protec. Relay Relay 1 VSD Control A VSD Control reaker reaker VSD VSD Power Power Cells Cells Page Copyright Oil & Gas All rights reserved 2011
13 Realtime topside-subsea network PROFINET PC Internet Explorer HTTP SNMP Socket TCP / UDP RealTime RT IRT PROFINET Field devices IP Ethernet PC SNMP/OPC Server Sensor System PROFINET PLC PROFINET provides standard TCP/IP communication according to IEEE and realtime communication Page Copyright Oil & Gas All rights reserved 2011
14 Realtime subsea network - Equipment protection Subsea network characteristics Real time support Accurate time stamping Switchgear Unit Provide transparent communication EPCU Power Channel A communication Channel communication Virtual direct link True signal path A VSD Process system Subsea Process Control EPCU Electric Power Control Unit Remote Terminal Unit Page Copyright Oil & Gas All rights reserved 2011
15 Standardized interfaces SIIS & MDIS SIIS three levels: Level 1 Simple instrument loops (4-20 ma) Level 2 CANbus (Fault tolerant) CANOPEN Level 3 Ethernet TCP/IP MDIS is an emerging open standard for the interface between the subsea control system (MCS) and the topside control system (DCS) SIIS Level 2, designed for complex subsea instrumentation The Siemens Power Grid can interface such instrumentation as a master, for example connect to external sensors The Siemens Power Grid can also act as an advanced slave unit, for example connected to a pump control system that sends rpm settings to the power grid Page Copyright Oil & Gas All rights reserved 2011
16 Interfacing the subsea power grid Third party DCS Transformer Total Power Control System Switchgear VSD s ooster pumps Page Copyright Oil & Gas All rights reserved 2011
17 Why Condition Monitoring? Specific condition monitoring goals: Detect abnormal equipment behavior Predict equipment failures Prevent performance degradation Maximize system availability Reduce maintenance Page Copyright Oil & Gas All rights reserved 2011 Illustration
18 How do we gather and process data? Data is used for condition monitoring and life time prediction Monitoring and life time prediction clients Relevant data to topside control, condition monitoring data directly to separate historian server Application Server Communication Gateway Historian server Topside Control Gather, process and send data Subsea Process Node (EPCU) Page Copyright Oil & Gas All rights reserved 2011
19 Use Case Power Electronics Page Copyright Oil & Gas All rights reserved 2011
20 The Subsea Power Grid Infrastructure Provide backbone for communication Provide auxillary power to other systems on the seabed Interface and data highway for new sensorsystems on the seabed Page Copyright Oil & Gas All rights reserved 2011
21 Siemens Subsea Power Grid - Enabling Subsea Processing further Thank you for your attention! Page Copyright Oil & Gas All rights reserved 2011
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