WP3 Power Electronics Development
Objectives: Driveline shaft and bearing system developed by SKF for hydrokinetic systems. The driveline will comprise thrust and radial bearings mounted in a manner advantageous for high reliability operation.
Description of work:
Shore based power electronics will control the variable voltage, variable frequency output from the wet-gap permanent magnet generator to enable grid connectivity and to optimize performance. The architecture of the system will include a COTS variable frequency drive to act as the AC/DC converter in the system. This will be the sole means of controlling turbine load. Because ORPC utilizes a fixed pitch cross flow turbine this project will focus on electronic capability in controlling hydrodynamic behaviour of such turbines. As part of WP6 of the project a trade study of turbine configurations will determine which turbine/foil arrangement offers the most beneficial torque transients per revolution, as well as highest efficiency. ORPC has previously used electrical converters to control the power output of the generator, but a combination of large moments of inertia, and large control time constants, has resulted in poor power quality being put on the grid, which is not acceptable for a commercial design. This innovative work package will design and implement a VFD based controller that can control the turbines performance to maximize peak power output, and to maximize power quality. Different grid connection architectures will be examined in order to choose inverter components which are able to connect to a utility grid or to a microgrid as appropriate. This work package of the project will be led by UCC and will include 5 tasks, outlined below:
Task 3.1: Generator – frequency converter concept design.
Associated deliverable: D3.1, Concept Study for optimal PTO configuration. Due month 12. Confidential.
Task 3.2: Dynamic simulation of the turbine-drive train system.
Associated deliverable: D3.2, Dynamic simulation models for PTO and controller. Due month 18. Confidential.
Task 3.3: Power electronic component testing.
Task 3.4: HIL-Laboratory test of the electrical system.
Associated deliverable: D3.3, Laboratory Test report for subsystem tests. Due month 24. Confidential.
Task 3.5: HIL-Laboratory full system test.
Associated deliverable: D3.4, Laboratory Test report for full system test. Due month 36. Confidential.