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lab:zephyr:smartgrid [2012-04-04 12:32] – created chronolab:zephyr:smartgrid [2013-06-05 14:34] (current) – external edit 127.0.0.1
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 +====== Smart-Grid ======
  
 +
 +  * Rectifying at production site and only providing 2 pole 16-48V to POL (Point of Load)
 +  * Leaving room for the possibility of higher system voltages in case of very long distances from windpark to POL
 +  * Define a common, simple but reliable connector system which is incompatible to others, to avoid accidents
 +
 +
 +===== Flexible System Configuration =====
 +
 +Allow for flexible consumption/wind specific load/source parameter based
 +switching of different star/triangle and parallel/serial configurations
 +
 +
 +==== Star/Triangle Configuration ====
 +
 +Examples and schematics
 +
 +
 +==== Parallel/Serial Configuration ====
 +
 +Draft for a control loop:
 +
 +Example values:
 +
 +  * V_out = 16V fixed
 +  * V_sys = variable, depending on load
 +  *V_gen = variable, depending on wind input and switching and system voltage
 +
 +watchdog V_out. if V_sys less than Vout, then
 +serialize the windings,
 +still to little voltage? -> if generator-coil-form-1 and many points are broken out of the coil, then serialize them in a pattern to gain more voltage
 +too much voltage? nevermind, either wait for a small period of time because the rotor has a mass and stores kinetic energy, which first has to be converted by the "new serial-wound-generator". the speed will drop eventually and the voltage will stabilize itself, OR
 +rapidly switch between parallel and serial modes (if the load, e.g. the synchronous rectifier, can cope with the spikes (inductive..) and has appropiate switiching abilities) and thus form an sort of automatic pulse width modulated, regulated, operation mode.
 +if V_sys + Vdelta,hysteresis >Vout, then
 +switch to parallel mode
 +
 +Other cases:
 +
 +Any of the voltages exceed e.g. 56V: emergency mode:
 +
 +  * Make the generator windings float or short them.
 +  * Shorting may not be an option. only with temperature control of the generator and the semiconductors due to the heat generated at a shortcut.!!
 +
 +If all batteries are loaded and the current user power consumption level is minimal, the power surplus of the turbine should be fed into high power LEDs, pointing upwards from the base, lighting the turbine. This adds to protect the
 +system of an unbalanced situation, when more power is generated than reasonably consume- or storable and at the same time to signal, that we still have more energy to share, inviting people to join, in a friendly and beautiful manner.
 +
 +In general, LEDs should also be incorporated at the controller: the controller should have a mosfet-switched control output, one 3W RGB led should display the wind speed or the battery voltage.. (on a scale from red to green and strobe patterns)
 +
 +**High-Tech**
 +
 +Dual rotor on single pole design, counterrotating, brushless royer converter, doubled rpm, less poles, switching power supply is already build in due to the royer converter, coil-in-coil, core coupling, voltage output may be quite high from the start. lower electrical efficiency? downside: needs IP67 protected circuits on both the rotor and the stator of the royer converter. upside: output voltage could be regulated on-board. also, input voltage may be very low depending on the setup.
 +
 +**Alternative**
 +
 +a rotor with lift-type wings on top and a rotor with drag-type wings at the bottom. thus the lower rotor gains speed at lower wind speeds but has a top end speed of approx. lift-type/2, while the lift-type wing still accelerates in high wind speed conditions.
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