MHK Technologies/Kinetic Hydropower System KHPS

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Technology Profile
Primary Organization Verdant Power
Project(s) where this technology is utilized MHK Projects/Roosevelt Island Tidal Energy RITE
MHK Projects/Cornwall Ontario River Energy CORE
Technology Resource
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Technology Type
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Axial Flow Turbine
Technology Readiness Level
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TRL 7/8: Open Water System Testing & Demonstration & Operation
Technology Description Verdant Power’s central technology is the Kinetic Hydropower System (KHPS), a water-to-wire system that consists of three main components: 1) KHPS TURBINE: a three-bladed horizontal-axis turbine with four major assemblies: a) Composite rotor with 3-fixed blades that rotate at the relatively slow and constant speed of approximately 40 RPM, with tip-speeds of 35 feet per second. This is well below normal water vessel propeller speeds and conventional hydropower turbine blade speeds. b) Sealed nacelle, pylon and passive yaw mechanism that is hydrodynamically designed to allow the turbine to self-rotate into the prevailing current (like a weathervane) so that the blades are optimally aligned to generate energy. c) Custom-designed drivetrain unit (with induction generator) enclosed within the nacelle that integrates the bearing housing with a special long-life planetary gearbox, with mechanical shaft seals and a minimum of sealed lubricants. d) Streambed mounting system that can vary depending on site conditions as a single drilled monopile, a single gravity-based structure, or a gravity-based triframe mount that supports 3 turbines. 2) UNDERWATER CABLING: low-voltage shielded cable of short distance; and shoreline switchgear vaults, control room, and interconnection point(s). 3) APPURTENANT FACILITIES: for navigation safety, such as Public Aides to Navigation (PATON) buoys and lighted warning signs, as well as instrumentation including Acoustic Doppler Current Profilers (ADCPs). In order to maximize the application of the KHPS within the global MHK resource, Verdant Power has designed the technology as a simple and uniquely scalable system that can be operated in tidal, river and ocean current settings. Possible KHPS installations range from distributed generation arrangements in near-shore urban and village settings to base power generation at offshore deepwater locales.

Mooring Configuration The KHPS includes a streambed mounting system that can vary depending on site conditions as a single drilled monopile a single gravity based structure or a gravity based triframe mounts that support 3 turbines
Optimum Marine/Riverline Conditions Min current velocity 2 5 m s Min depth 10 m

Technology Dimensions
Technology Nameplate Capacity (MW) Scalable generally ranging per unit from 56 kW 5m class to 500 kW 10m class
Device Testing
Scale Test •In 2002 Verdant Power conducted testing of a near full scale turbine 10 foot 3 05m diameter Gen3 KHPS turbine This unit was created to secure detailed performance data for both dynamometry and power generation The turbine had a downstream rotor configuration and some yaw capability and was in water tested from a purpose built vessel in the East Channel of the East River The East River tests of the rotor performance demonstrated a peak efficiency that was consistently high from 37 6 to 44 3
Lab Test •INITIAL ROTOR TESTING 1983 84 To test the critical energy capture element the rotor several 9 rotor designs were fabricated on the model scale first at 0 69m dia then at 0 85m dia for dynamometry testing including two and three blade rotors with tipspeed ratios from 3 to 6 These were tested at the David Taylor Naval Ship Research and Development Center DTNSRDC in the Circulating Water Channel CWC For each design rotor torque rotation speed and derived power and efficiency data was plotted and curve fit for each water speed Optimal operating curves were generated for each rotor and their performances were compared After a first test set a second larger set of blades was constructed that included a conformal shape modification to suit the relatively large blade chords to the small hub diameters of the rotor ADVANCED ROTOR TESTING 2012 Under CRADAs with NREL and Sandia National Labs and an Advanced Water Power Program award Verdant Power and project pa
Full-Scale Test •During 2006 08 Verdant Power demonstrated a fully functional full scale pre commercial Gen4 KHPS in an open water ocean setting the East Channel of the East River ocean tidal strait The Gen4 KHPS featured bottom mounting full yaw capability automatic power flow control and grid connection with a multiple turbine array The RITE demonstration entailed mounting and operating six 6 Gen4 KHPS turbines five of which were generator units and one a hydrodynamically identical dynamometer for rotor testing The generator units used 37kW induction generators and were connected to two commercial end users The dynamometer unit was fully instrumented for torque and tachometry measurements along with compass inclinometer vibration various component temperatures humidity and leak detection The RITE Gen4 KHPS met or exceed all performance expectations successfully demonstrating the system as an efficient source of renewable energy with the following outcomes Gr

Relevant Technical Publications •01 - Detailed Inflow Measurements for Kinetic Hydropower Systems in a Tidal Strait

02 - Verdant Power Final License Application (FERC No. P-12611-005) 03 - Verdant Power Final License Application (FERC No. P-12611-005) 04 - Hydrodynamic Analysis of Kinetic Hydropower Arrays 05 - NYSERDA RITE Environmental Assessment Project - Final Report (March 2011) 06 - INEL Free-Flow Report for USDOE-EERE (#DOE/ID-95/00073)

Date Submitted 6/18/2012

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