Bremen Final Use Case Report A1: Operation-optimized system of opportunity charging at bus depots B1: Recuperation of braking energy from trams: Refurbishment of a flywheel energy storage system Deliverable D2.2 Carsten Peters, BSAG Authors Yusuf Demirkaya, BSAG Helmut Berends, Berends Consult Status F Document’s privacy PU Reviewed by Yannick Bousse, UITP Wolfgang Backhaus, Rupprecht This project has received funding from the European Union’s Horizon 2020 research and innovation programme under grant agreement No 636012. D2.2 Bremen Final Use Case Report SUMMARY SHEET Programme Horizon 2020 Contract N. 636012 Project Title Electrification of public transport in cities Acronym ELIPTIC Coordinator Free Hanseatic City Of Bremen Web-site http://www.eliptic-project.eu/ Starting date 1 June 2015 Number of months 36 months Deliverable N. 2.2 Deliverable Title Bremen Final Use Case Report Milestones N/a Version 0.3 Date of issue 15 June 2018 Distribution External Dissemination level Public Abstract This document gives an overview of the final outcomes for the two Use cases in the framework of Pillar A and B performed in the City of Bremen (Germany). The Pillar A Use case is about testing of two electric buses (12m and 18m) in day-to-day operation on various urban bus lines and overnight slow charging at the depot. The Pillar B Use case is a study about getting insights whether and under which conditions a refurbishment of a flywheel to store the braking energy of the tram is useful. For the Pillar A Use case both electric bus vehicle types are analysed by different methodologies (business case scenarios, CBA, process evaluation) and the selected KPIs evaluated. Finally, the follow-up activities and conclusions are elaborated. Deviating from that, for the Pillar B Use case only the SWOT results are described. This is due to the fact that the technical problems of the flywheel (strong vibrations at high speeds) couldn’t be overcome by repair measures. Keywords Bremen Use Case, electric buses, overnight charging, recuperation, energy storage Critical risks The operation of a flywheel energy storage system might cause technical difficulties due to second resonance frequency issue caused by strong vibrations at high speeds. This report is subject to a disclaimer and copyright. This report has been carried out under a contract awarded by the European Commission, contract number: 636012. The content of this publication is the sole responsibility of ELIPTIC. | 1 D2.2 Bremen Final Use Case Report Document change log Pillar A Version Date Main area of changes Organisation Comments 0.1 08/02/2018 All chapters BSAG, Berends-Consult Final Draft 0.2 13/02/2018 Review of document UITP / 0.3 13/02/2018 Update all chapters BSAG, Berends-Consult / 0.3 11/05/2018 Final review Rupprecht Document change log Pillar B Version Date Main area of changes Organisation Comments 0.1 08/02/2018 All chapters BSAG, Berends-Consult Final Draft 0.2 13/02/2018 Review of document ASSTRA and UITP / 0.3 13/02/2018 Update all chapters BSAG, Berends-Consult / 0.3 11/05/2018 Final review Rupprecht Partner Contribution Pillar A Company Name Description of the partner contribution P3 BSAG BSAG – Bremer Straßenbahn Compilation of the content (text, data, images, graphics) and AG preparation for all chapters in all versions (draft, intermediate and final) P15 RWTH Rheinisch-Westfälische Contributing input for chapter 5 Aachen Technische Hochschule Aachen P34 Rupprecht Rupprecht Consult – Contributing input for chapter 5 Forschung & Beratung GmbH Partner Contribution Pillar B Company Name Description of the partner contribution P3 BSAG BSAG – Bremer Straßenbahn Compilation of the content (text, data, images, graphics) and AG preparation for all chapters in all versions (draft, intermediate and final) P29 Siemens Siemens Aktiengesellschaft Contributing input for chapter 5 | 2 D2.2 Bremen Final Use Case Report ACRONYMS BSAG: Bremer Straßenbahn AG CBA: Cost Benefit Analysis DoW: Description of Work ITS: Information and Telecommunication System KPI: Key Performance indicators LCC: Life Cycle Cost OEM: Original Equipment Manufacturer PT: Public Transport SWOT: analysis to find strengths, weaknesses, and the opportunities and threats someone face WP: Working Package | 3 D2.2 Bremen Final Use Case Report Table of Contents SUMMARY SHEET .................................................................................................... 1 Document change log Pillar A ................................................................................. 2 Document change log Pillar B ................................................................................. 2 Partner Contribution Pillar A ................................................................................... 2 Partner Contribution Pillar B ................................................................................... 2 Table of Figures ........................................................................................................ 5 List of Tables ............................................................................................................ 5 1. Executive summary ........................................................................................... 6 A.1: Operation-optimized system of opportunity charging at bus depots ................................... 6 B.1: Recuperation of braking energy from trams: Refurbishment of a flywheel energy storage system ..................................................................................................................................... 6 2. Introduction ....................................................................................................... 8 3. Use Case Overview ........................................................................................... 9 A.1: Operation-optimized system of opportunity charging at bus depots ................................... 9 B.1: Recuperation of braking energy from trams: Refurbishment of a flywheel energy storage system ................................................................................................................................... 15 4. Methodology .................................................................................................... 18 A.1: Operation-optimized system of opportunity charging at bus depots ................................. 18 B.1: Recuperation of braking energy from trams: Refurbishment of a flywheel energy storage system ................................................................................................................................... 21 5. Main evaluation results ................................................................................... 22 A.1: Operation-optimized system of opportunity charging at bus depots ................................. 22 B.1: Recuperation of braking energy from trams: Refurbishment of a flywheel energy storage system ................................................................................................................................... 24 6. Follow-up after the Use Case ......................................................................... 26 A.1: Operation-optimized system of opportunity charging at bus depots ................................. 26 B.1: Recuperation of braking energy from trams: Refurbishment of a flywheel energy storage system ................................................................................................................................... 26 7. Conclusions ..................................................................................................... 27 A.1: Operation-optimized system of opportunity charging at bus depots ................................. 27 B.1: Recuperation of braking energy from trams: Refurbishment of a flywheel energy storage system ................................................................................................................................... 28 8. Appendix .......................................................................................................... 29 9. Bibliography .................................................................................................... 31 | 4 D2.2 Bremen Final Use Case Report Table of Figures Figure 1 – SILEO 12m electric bus (source: BSAG) ................................................... 9 Figure 2 – EBUSCO 12m electric bus (source: BSAG) ............................................ 10 Figure 3 – SILEO 18m electric bus (source: BSAG) ................................................. 10 Figure 4 – Use Case Bus Line 29 and 52 (source: BSAG) ....................................... 11 Figure 5 – Use Case Bus Line 51 (source: BSAG) ................................................... 12 Figure 6 – Use Case Bus Line 53 (source: BSAG) ................................................... 12 Figure 7 – Use Case Bus Line 20 (source: BSAG) ................................................... 13 Figure 8 – Use Case Bus Line 63 (source: BSAG) ................................................... 13 Figure 9 – Flywheel location along the tram line 1 .................................................... 15 Figure 10 - Flywheel storage unit front picture (Rosseta Technik GmbH, 2006) .. 17 Figure 11 - Schematic sketch of the investigated bus route and its respective operative parameters ................................................................................................ 19 Figure 12 - Simulated power and SOC curves for average conditions ( ~ 1 kWh/km) 19