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Renewable energies except solar electric or thermal (seeforums dedicated below): wind turbines, energy from the sea, hydraulic and hydroelectricity, biomass, biogas, deep geothermal energy ...
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Forhorse
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by Forhorse » 17/11/10, 22:46

it will be done, even if I have no more APN, my phone should allow me to take some drinking photos.
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chatelot16
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by chatelot16 » 18/11/10, 01:14

your remarks don't fall on deaf ears

for batteries the price per khw for lead-acid batteries is about the same from small to large

so no matter a big 12v battery, or a small collection to make 100v or more

except that with a high voltage we can place the wind turbine or we want even far without breaking the bank in big cable

and by choosing a battery voltage slightly higher than the peak voltage of 220v we simplify the inverter!

my future wind turbine will be wound to charge a 325V battery

Forhorse your spike drive will serve as an inverter
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by Forhorse » 18/11/10, 07:54

chatelot16 wrote:Forhorse your spike drive will serve as an inverter


No, it will not be able to perform this function as I am designing it because there is no H-shaped output bridge but a simple chopper.
But it is sure that with a 325V input it is not very difficult to make the 230V alternative.
On the other hand, in the case of an H-bridge under this voltage, there is the problem of controlling the higher MOSFETs, because it is necessary to generate a control voltage of at least 337V which is not easy, and find a driver which accepts this command.
Unless you use a ready-made module that already contains all the control logic, a little more expensive but much simpler.
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by bernardd » 18/11/10, 09:09

To increase a voltage, one can use an assembly where one charges capacities in parallel (weak tension, strong current), one switches in series, and one discharges them in series (strong tension, weak current).

We could also use the same type of upside-down mounting: we charge in series ((high voltage, low current), we switch in parallel, and we discharge them in parallel (low voltage, high current).

If one side is AC, you must make the switches at the right frequency, or even reverse the assembly using the switches. If you want to make the alternative from DC, you can use a clock signal to control the switching.

A priori this system should have a very good efficiency, because the capacitors have very few losses.

It could also be a means of increasing the voltage at the output of solar panels, while electrically decoupling them.

Have you seen such fixtures on the market?
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by Forhorse » 18/11/10, 10:39

We call it a charge pump.
But it is only used for very low current because the capacitors have several disadvantages:
- they are expensive
- they occupy a significant volume when you want to work with powers that exceed a few watts
- their lifespan is inversely proportional to the temperature and the working frequency
- as soon as one exceeds a frequency of a few tens of hertz they present an equivalent impedance which induces non negligible losses.

For voltage conversions in power circuits it is widely preferred to use inductive circuits, it is more efficient and less expensive.
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by bernardd » 18/11/10, 10:54

OK, thanks. The idea was also to avoid the use of a battery inverter before a computer, making a 2-stroke power supply, by avoiding back and forth AC / DC / AC / DC: we still have to gain 30 % energy efficiency.
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by chatelot16 » 18/11/10, 12:37

I'm not talking to you about the chopper of this subject but about the speed variator of the application note that you presented in another subject speed variator for single-phase motor

the only thing to add to it is an output filtering so as not to subject all the material supplied to the pwm signal but to its own voltage

right now there are cheap inverter generator sets in brico depot: i will be able to buy one just to see how it is made ...

of course my high voltage wind turbine story only counts for those who want to manufacture ... with commercial equipment you have to be content with what is sold, just prefer 48v when it is available

another idea not to forget, for the big section the aluminum cables are much cheaper than copper, it is the cable used by edf to distribute the 220/380, we easily find it at scrap merchants, scrap of several tens of meters!
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by Forhorse » 18/11/10, 17:10

I would prefer 72V, I think it is a good compromise between the number of batteries for storage (6 12V batteries in series is still affordable) "modest" line currents (for a 3kw domestic installation under 72V that is 42A, already not bad but we are far from the 125A of the same power under 24V) and therefore inevitably losses in line and the price of the cable reduced.

But to find 72V gear you have to get up early!
72V is a, if not LA, standard voltage in railways, but then I will not tell you the price of 72V inverters as found on rolling stock (not to mention that they often come out of 3 * 400V) : Lol:
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by Forhorse » 09/12/10, 12:57

Ayé matos received 8)
In fact I already had it since Monday at the neighbor, but I was in Strasbourg. So in fact the transport took 1 week.
The total delay between the request for a quote and the delivery took 3 weeks.
Both packages at the reception. Vulgar cardboard boxes that seem to have suffered a little from transport.
Image

I was afraid for the blades (the biggest box) but no, everything is well wedged and protected.
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The other box, the smallest but the heaviest, which contains the basket
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by chatelot16 » 09/12/10, 13:28

bernardd wrote:To increase a voltage, one can use an assembly where one charges capacities in parallel (weak tension, strong current), one switches in series, and one discharges them in series (strong tension, weak current).


the transfer of charge between the condenser, it is as con as the transfer between the compressed air tank: brutal and with loss of energy

the switching power supplies with inductive element have a better efficiency and especially a possibility of variable output voltage with constant efficiency
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