Subsea Electric Power Grid
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1 Subsea Electric Power Grid Transatlantic Science Week November 14, 2012 Anngjerd Pleym Siemens - Oil & Gas Division Integrated System Solutions Technology & Innovation
2 Subsea power distribution is the key enabler for future power consuming subsea processing Subsea power is key enabler for subsea processing Enabling technologies (Relative importance) Power (MVA) Subsea power distribution technologies Standard Long distance Very long distance DC Transmission AC Transmission kv AC Transmission Low frequency/ Line compensation Enabling technologies identified by operators as the ones required to make subsea processing widespread AC is the key focus area today Distance, km Getting reliable, field proven power distribution systems considered to be the most important enabler Technology risks are viewed to be manageable Source: Douglas Westwood, GE Oil & Gas, Arkwright research Page 2
3 Siemens is working towards providing small field electrification 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 Beyond 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-site VSD Subsea transformer, top-site 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 Source: Subsea Future team Page 3
4 The Siemens Subsea Power Grid Page 4
5 The Siemens Subsea Power Grid Siemens subsea power grid scaleable / flexible 3000 m dept oil filled pressurized natural cooling reliable condition monitoring universal and redundant control system Page 5 Subsea Transformer pressure compensated natural cooling environmental friendly design Subsea Switchgear pressure compensated base module integrated auxiliary supply main switch in 1 atm. Canister Subsea VSD natural cooling pressurized power electronics integrated transformer multi cell topology with inherent redundancy
6 The Subsea Power Grid Control System Key characteristics Redundant system Onshore plant (or topside) Switch + Transf. Electro Node Subsea Process Node (EPCU) Local interface nodes () Flexible control topology Autonomous system Standard Interfaces Extensive monitoring and calculation of KPIs Cable SSU Transf Fiber optic EPCU Medium Voltage Power Control and monitoring communication SIIS level 2, 3rd party communication interface Power Cable with fiber optic communication line Onshore / topside condition monitoring system with fault detection and diagnosis VSD VSD VSD VSD EPCU Electric Power Control Unit Remote Terminal Unit Process Control System Process system Page 6
7 Pressurized power electronics Converters for Sea Bed Logging Siemens has developed and built a power converter for performing offshore high accuracy electromagnetic surveys for finding hydrocarbons/oil. Pressure exposed Power electronics Design Requirements: Water depth 3500m. Endure pressure cycling High current: 1500A Experience: Delivered units: 16 Survey hours: more than h Page 7
8 Subsea Centre Trondheim Page 8
9 The Siemens Subsea Power Grid True subsea solution -Pressurised power electronics - No large pressure canisters Page 9
10 Standards and procedures BP DNV RP-A203 API 17Q Statoil Page 10
11 Building trust through the Technology Qualification Program Physical testing Analysis (technical and reliability) Procedural precautions Previous experience Page 11
12 Qualification in stages System (in shallow water) Modules Subassemblies ~ Components Page 12
13 Siemens Subsea Power Grid - Enabling Subsea Processing further Thank you for your attention! Copyright Siemens Energy Oil & Gas All rights reserved 2011 Page Anngjerd Pleym Siemens Energy
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