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I own an old watermill in France. I am in the process of upgrading the old Francis turbine. I am thinking of installing a new Single Regulated Kaplan Turbine (variable wicket gate, fixed pitch runner (propeller)). …
I own an old watermill in France. I am in the process of upgrading the old Francis turbine. I am thinking of installing a new Single Regulated Kaplan Turbine (variable wicket gate, fixed pitch runner (propeller)).Looking at the efficiency (hill) graphs for similar turbines it seems that there would be considerable gain in efficiency by operating the turbine at variable speed to accommodate the variable water flow and the variable head. Head is nominally 2.5 m (min 2.0 m, max 3.0m); water flow is up to 10 cubic meters per second.
Grid tied inverters (400 V, 50 Hz) are available to take the variable frequency and variable voltage AC generated by Wind Turbines. I am thinking of using a Permanent magnet Generator (PMG) directly connected to the turbine – no gears or belt drive, less loss, less noise, more stable turbine operation etc.
I have two main questions:
(a) are there links on the web to theoretical and empirical studies of the benefits of using variable speed generators for Single Regulated Kaplan turbines on small hydro projects?
(b) is it possible to obtain inverters that operate with hydro turbines?
To operate the turbine at the optimum speed for the desired water flow it must be necessary to vary the torque at the generator shaft. To vary the torque it must be necessary to vary the electrical load applied by the inverter. How is this done?
Is it possible to program the inverter to optimize the speed by continuously hunting for the optimum speed for maximum electrical output? Is this software algorithm available online?
Thank you in advance for any pointers.
Moulin De Aillevans (Latitude, Longitude) (47.586256, 6.431401)
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