1. 1 | Program Name or Ancillary Texteere.energy.gov Water Power Peer Review Three Port Marine Power Electronics Conversion System Mark Holveck Princeton Power Systems mholveck@princetonpower.com September 20 2011 Marine High-Voltage Power Conditioning and Transmission System with Integrated Energy Storage

2. 2 | Wind and Water Power Programeere.energy.gov Purpose, Objectives, & Integration Wave, tidal, and ocean power technologies are niche markets with a large potential for growth. The power electronics for these systems are often overlooked. The power electronics for these systems must be: 1.Capable of operating in a demanding, ocean environment, over an extended period of time, with minimal servicing and maintenance requirements. 2.Capable of Integrating the intermittent power created by most marine hydrokinetic generation systems, by buffering the power using control algorithms and a small energy storage bank. PPS will demonstrate a TRL 6 Marine Power Conditioner with Storage, with high conversion efficiency (97.0%), and a compact high-frequency internal transformer to allow direct connection to a 50kV DC line for transmission to shore. The small size, efficiency, and simplification of the system design will significantly reduce the installation cost of ocean power systems while improving transmission efficiency and grid integration. This project is being cost shared with another project to develop a bi-directional 480VAC to 50KV power converter for rural Alaska villages which is sponsored by Polar Consult LLC and the University of Alaska.

3. 3 | Wind and Water Power Programeere.energy.gov Technical Approach A critical objective of this program is to demonstrate that three proven technologies can be combined to create a new, advanced power conversion system for marine environments. Demonstrating the interaction of the demand response inverter power conditioner platform, a high voltage direct current switching bridge, and an ultra capacitor bank represents a technological advancement in the field of power conversion electronics. A low-cost, efficient HVDC switching bridge will provide a direct connection to HVDC lines for transmission to shore. A small ultra capacitor bank will provide a cost-effective means of storing and discharging small amounts of energy to buffer the intermittency of the marine generator and make it a more useable electrical source. The Demand Response Inverter power conditioning topology, based on AC-link circuit technology, provides for isolation between all ports and controls the integrated operation and power flow.

4. 4 | Wind and Water Power Programeere.energy.gov Technical Approach

5. 5 | Wind and Water Power Programeere.energy.gov Technical Approach Circuit topology with internal ultra-cap terminal and 50 kVDC output LVAC Enclosure HVDC Transformer and Tank

6. 6 | Wind and Water Power Programeere.energy.gov Plan, Schedule, & Budget Schedule Initiation date: Sept. 1 2010 Planned completion date: Feb. 29 2011 Budget: DOE Funding $599,79980% Spent Cost Share $400,00080% Spent Budget History FY2009FY2010FY2011 DOECost-shareDOECost-shareDOECost-share $479K$319K

7. 7 | Wind and Water Power Programeere.energy.gov Task % complete4Q101Q112Q113Q114Q111Q122Q123Q12 1.Final Hardware Design100% –Develop specification – PE Topology-Electro Mechanical Packaging. 2.Develop and Test HVDC Switching Bridge100% –Initial Bring up and test are completed 3.Design Ultracap bank and Controls40% –Develop custom watercooled film cap design –Develop cap sub-assembly –Develop ultra-cap control algorithms 4.Final Software Design80% –Existing controls code has been modified –Currently Integrating code to hardware and validating. 5.Select Vendors / Procurement90% –Power electronics and magnetics are procured –Mechanical enclosures and BOS are procured –Controls Hardware is Procured 6. Assemble the complete prototype system 80% 7. Develop Test Plan / Software / Assemble Test Bay60% 8. Run Testing Program10% 9. Identify Field Testing sites / partners0% Plan, Schedule, & Budget

8. 8 | Wind and Water Power Programeere.energy.gov Accomplishments and Results Power converter design completed and prototype unit has been constructed. Initial component and subassembly testing is completed. Prototype functional testing is currently ongoing. Current testing of the HVDC transformer tank at low voltage in air shows the AC to DC functionality. We are currently beginning to test the DC to AC functionality. Hi-Pot TestingHV Transformer LVAC Enclosure

9. 9 | Wind and Water Power Programeere.energy.gov Accomplishments and Results Prototype build will be completed when “in air” testing is completed and transformer is placed in oil for HVDC testing. Current “in air” measurements of AC-DC testing have met our expectations. DC-AC testing is currently underway.

10. 10 | Wind and Water Power Programeere.energy.gov Challenges to Date Important challenges faced are completing functional testing of the prototype “in air” verifying AC-DC and DC-AC power conversion functionality. Once “in air” testing is completed the transformer will be processed in oil and full HVDC testing will begin. Due to the difficulty in making changes and modifications to the unit once the HV stacks and transformer are immersed in oil, extra care is being taken during the “in air” testing to ensure accurate and acceptable results. HV TransformerTransformer Tank

11. 11 | Wind and Water Power Programeere.energy.gov Next Steps Remaining project plan includes completing “in air” functional testing, processing transformer in oil and completing HV testing. Completion and integration of the energy storage unit and final system testing in Qtr 1 2012. Final report by Feb. 29, 2012. Next Steps: Review test results and make modifications to prototype unit as required. Identify partner to help integrate technology into field-able unit for field testing in actual wave-power application.

12. 12 | Wind and Water Power Programeere.energy.gov Additional Slides The following slides are for information purposes only

13. 13 | Wind and Water Power Programeere.energy.gov Guidelines for number of slides (Not a template slide – for information purposes only) Most presenters this year will be allotted between 10 and 20 minutes for the presentation with 5 to 10 minutes reserved for Q&A. Thus, shorter presentations should contain a maximum of 10 presented slides, with no more than 1 slide per minute for longer presentations. The bulk of your presentation/discussion should be devoted to the “Technical Approach,” “Accomplishments and Results,” and “Next Steps” sections, depending on how much work has been completed

14. 14 | Wind and Water Power Programeere.energy.gov Preparation Instructions (Not a template slide – for information purposes only) Do not include any proprietary, copyrighted, or confidential information. Do not mark any slide with “Official Use Only” or any similar restriction used by your organization. Please name your electronic MS PowerPoint presentation file as follows (use the first 4 letters of your title): [Title_Organization_LastName.ppt]. Do not incorporate animation or special effects since all presentations will be saved as PDF files for presentation and for posting on the web. Animations critical to describing the project may be presented as separate files, however they must be approved by the Program and presented within your allotted time.

15. 15 | Wind and Water Power Programeere.energy.gov Final Instructions (Not a template slide – for information purposes only) Your presentation, in MS PowerPoint format, is due to Ed Eugeni at Edward_Eugeni@sra.com by September 27 th. If your presentation is too large to email, contact Ed Eugeni at 240-223-5552 for alternative delivery options. Reviewers will be receiving your presentation prior to the meeting. In order to supply adequate time for the reviewers to review your material prior to the meeting, you MUST submit your presentation by close of business on September 27th. Your project is subject to a score reduction penalty if you fail to meet this deadline.

16. 16 | Wind and Water Power Programeere.energy.gov Questions? (Not a template slide – for information purposes only) Contact: –Hoyt Battey at Hoyt.Battey@ee.doe.gov, 202-586-0143Hoyt.Battey@ee.doe.gov –or Ed Eugeni at Edward_Eugeni@sra.com, 240-223-5552