C·Power has made extensive use of modeling and scaled testing in its product development efforts. Over the past twelve years, we’ve conducted five tank tests and four sea trials in addition to thousands of hours of modelling. After considering hundreds of hull shape variations and design specifications, the result of this intensive effort is a scalable wave power system that delivers the qualities that our customers need: survivability, a competitive cost and an environmentally-friendly footprint.
2004-2007: Humble beginnings as graduate research at Oregon State University
The initial design and development effort was started at Oregon State University. The early design generations were linear direct-drive systems, with the first prototype tests conducted at the Hinsdale Wave Research Laboratory (HWRL) in 2004. This early testing demonstrated that a linear direct-drive permanent magnet generator (PMG) was a potentially feasible solution for converting wave power into electricity. Following refinement of the concept and licensing by C·Power, a 1 kW device (version 1.0) was deployed off the coast of Newport, OR in 2007.
2007-2009: C·Power licenses OSU’s design and continues to build upon it
In 2008, a 10 kW second-generation device (v2.0), with improved hydrodynamic performance, was deployed at the same location. While the test was successful, projected cost of energy and reliability considerations necessitated a departure from this design and the creation of a new proprietary concept using direct-drive rotary generators. The resulting third-generation (v3.0) concept has allowed a greater range of potential energy capture and more optimal performance, as well as lower relative capital and operating costs.
A v3.0 prototype was tested at 1:50 scale in 2008 and 1:33 scale in 2009. This was followed in 2010 by the testing at HWRL of a 1:15 scale system. In addition to verifying energy performance, assessing system survivability was an important aspect of these tests, which included waves reaching 29m at full-scale equivalent.
2009-2012: Continuing to improve performance
Numerically-driven hydrodynamic design optimization led to the subsequent v3.1 design, which was tested at 1:33 scale at HWRL, both as a single device and in three and five unit arrays. The v3.1 design had been optimized for manufacturability, in addition to providing a performance improvement of over 230%. In February 2011, a 1:4.5 scale v3.1 prototype was deployed for thirteen month sea trials in Puget Sound.
Following this deployment, the hydrodynamic design was further optimized (v3.2) to avoid the expense and risk of range-of-motion-limiting end stops. Nearly a thousand simulations were run and the resulting design changes reduced projected capital and operating expenses, while predicting annual energy production nearly twice that of v3.1. A smaller-scale v3.2 prototype was tested at HWRL in late 2012 to validate the design improvements.
2013-2018: Testing and characterising the LandRAY generator
2018-2019: Design, build, and deploy StingRAY
C·Power is currently finalizing the StingRAY design, with planned open-ocean testing of a full-scale system in 2014-2015.