Combined HTS Cable and Fault Current Limiter Project in Germany Mathias Noe, Institute for Technical Physics, KIT Mark Stemmle, Nexans Germany Frank Schmidt, Nexans Germany Frank Merschel, RWE Joachim Bock, Nexans SuperConductors EPRI Superconductivity Conference, 12.-13. October 2011, Tallahassee, US 1
Combined HTS Cable and Fault Current Limiter Project in Germany Motivation Application Concept Case Study AmpaCity Project Summary 2
Background Power supply within cities predominantly with cables Many quite old cables and substations Refurbishment / replacement in upcoming years Adaption of substations to new load requirements High temperature superconductor systems (HTS cables in combination with HTS fault current limiters) Option for replacing conventional cables Enabling of new grid concepts 3
Combined HTS Cable and Fault Current Limiter Project in Germany Motivation Application Concept Case Study AmpaCity Project Summary 4
Application Concept HV Cables HV1 HV2 MV1 MV2 HV3 MV3 HV bus MV bus HV UGC MV UGC Bus tie (open) Capacity of one transformer equals total load in each substation 5
Application Concept Medium Voltage HTS Cables I HV1 HV2 MV1 MV2 MV3 HV bus MV bus HV UGC MV UGC Bus tie (open) Capacity of one transformer equals total load in each substation 6
Application Concept Medium Voltage HTS Cables II HV bus MV bus HV UGC MV UGC Bus tie (open) Capacity of one transformer equals total load in each substation 7
Combined HTS Cable and Fault Current Limiter Project in Germany Motivation Application Concept Case Study AmpaCity Project Summary 8
Case Study RWE, Nexans, KIT, U Hannover Contents Applications and Specification Cable Design Operation Parameters HTS Cables in the Grid Economic Feasibility State-of-the-art of HTS cable R&D Tests 9
2,6 km 3,1 km 2,7 km 2,6 km 4,6 km 3,0 km Case Study Urban grid with HV cables 110 kv OHL A 6,2 km B 110 kv UGC 10 kv UGC 5,0 km 110 kv busbar 10 kv busbar Bus tie (open) C 4,3 km D 2,2 km E F G 4,7 km H 3,6 km I 3,2 km J 10
2,7 km 2,7 km 2,6 km 2,6 km 8,4 km 3,0 km 3,0 km 4,6 km Case Study Urban grid with MV-HTS cables 110 kv OHL 110 kv UGC 10 kv UGC 110 kv busbar 10 kv busbar Bus tie (open) A 6,2 km B 5,0 km E D C F G 4,7 km H 6,8 km J 3,6 km I 3,2 km 11
Case Study Overall changes in the grid Dispensable devices for new grid concept 12.1 km of 110 kv cable systems 12 x 110 kv cable switchgear 5 x, 110/10 kv transformers 5 x 110 kv transformer switchgear 5 x 10 kv transformer switchgear Additionally required devices for new grid concept 23.4 km of 10 kv HTS cable system 16 x 10 kv cable switchgear 3 x 10 kv bus ties 12
Case Study Right of Way and Installation Space N2XS(FL)2Y 1 x 300 RM/35 NA2XS2Y 1 x 630 RM/35 Nexans HTS 10/40 600 650 400 850 700 100 200 100 1200 1050 125 100 100 100 100 145 125 175 125 125 175 13
Case Study Economic Feasibility Total Cost Investment Cost Operation Cost Losses Maintenance Total Loss Power System Loss Thermal Loss No-load Loss Load Loss 14
Operation cost in 1. year in T Case Study Economic Feasibility Comparison of 3 different options based on NPV method Investment costs and operating costs (maintenance and losses) 40 years 1800 2 % yearly increase 6.5 % interest rate 1600 1400 1200 1471,6 1421,6 1257,9 65 /MWh 1000 M M M 800 600 400 T T T 200 0 L L L 110 kv 10 kv conv. 10 kv HTS 15
Total NPV in M Case Study Economic Feasibility Comparison of 3 different options based on NPV method Investment costs and operating costs (maintenance and losses) 40 years 2 % yearly increase 6.5 % interest rate 120 100 80 103.2 87.7 93.7 65 /MWh 60 40 20 0 110 kv 10 kv conv. 10 kv HTS Investment costs NPV operating costs 16
Combined HTS Cable and Fault Current Limiter Project in Germany Motivation Application Concept Case Study AmpaCity Project Summary 17
AmpaCity Project Project Objectives Development and field test of a 1km long, 10 kv cable in combination with a resistive type SCFCL Project Duration: 09/2011-08/2015 Cable and SCFCL Installation in 2013 Project Partners and Roles RWE Specification and Field Tests Nexans HTS Cable and FCL KIT HTS Material Tests and Characterization 18
AmpaCity Project Three phase, 10 kv cable concept Phase 2 Phase 3 Phase 1 LN 2 Inlet Dielectric Former Screen LN 2 Return Cryostat 19
AmpaCity Project Three phase, 10 kv cable terminal Phase 1 Phase 2 Phase 3 Cooling System Inlet / Return Screen Cryostat 20
AmpaCity Project Installation in Downtown Essen, Germany Approximately 1 km cable system length with one joint Installation in Q4/2013, afterwards at least two year field test in grid 21
Combined HTS Cable and Fault Current Limiter Project in Germany Motivation Application Concept Case Study AmpaCity Project Summary 22
Summary HTS systems attractive alternatives to conventional systems Replacing HV cable systems with MV HTS cable systems Reduction of inner city transformer substations Concentric HTS cable systems for MV applications Very good electromagnetic behavior Thermally independent from environment Small right of way and reduced installation costs Enabling new grid concepts for urban area power supply AmpaCity project in Germany started (HTS cable and SFCL) 23