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flc1
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Posted: 06 September 2017 at 9:32am | IP Logged Quote flc1

Cool Dave,thats the one, a wind tunnel! a single fnp stator with high voltage inverter would be good,and your pfc caps of coarse, would have to have the furling sorted properly,but you should end up with good turbine.



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flc1
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Posted: 06 September 2017 at 9:39am | IP Logged Quote flc1



I like the analog meters with the moving needle
getting a mate whos a certified electrician to check it all.

Edited by flc1 on 06 September 2017 at 10:00am
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flc1
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Posted: 06 September 2017 at 11:24am | IP Logged Quote flc1

I removed the disc brake when I changed the stators for the new inverter,

So the disc brake is not on the turbine.
just going to rely on dumploads and manual/auto furling.
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kitestrings
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Posted: 06 September 2017 at 2:22pm | IP Logged Quote kitestrings

Quote:
So the disc brake is not on the turbine.
just going to rely on dumploads and manual/auto furling.


My bias is that furling the tail is just a kinder, more passive shut-down. I think a mechanical brake, or shorted winds works great for a parking brake when you have to work on the thing, but the tail thing does the job without fear of a burn-out, or just the rattle and shake on things.

When we want to shut down our turbine we furl the tail with the actuator, wait a minute or three and then close in the resistive load bank. It keeps the thing under 10 or 15 rpms in all sorts of wind.
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kitestrings
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Posted: 06 September 2017 at 2:34pm | IP Logged Quote kitestrings

It might be worth mentioning, or clarifying, (asking?, because I may have it wrong for your application) that there is a difference between a dump load and a load used for managing the peak voltage and/or speed of a turbine; sometimes called a clipper. I think the latter is what you are doing.

A dump load is usually paired with a PWM charge controller and is used as a means regulating charge to a battery bank. In theory the turbine is always loaded and the controller diverts excess to maintain the desired charge rate.

A clipper is usually introduced in varying degrees to cap the voltage of turbine. Especially with battery-tied systems this is necessary to replace the load removed by the charge controller as the bank reaches full charge, then float condition.
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DaveP68
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Posted: 06 September 2017 at 9:43pm | IP Logged Quote DaveP68

I can speak for Fred's set up, as supplied various parts to make it all work. His system has both a dump load and the voltage limiting system.

Remember this is a grid tie system so discussing batteries is a bit of a deviation away from what is being used here. It's all about keeping things under control like you say grid tie or charging batteries.

Anyway I don't want to steal Fred's thunder, as he will be able to explain it in more detail than I can.

My Electronic Dynamic braking circuit (for F&P only at this stage) is working well and almost in a configuration where it can be added to a wind turbine to try out. It will perform the full controlled shut down as you have described above but do it quicker. If you're interested to why I can get this braking system to shut a wind turbine down quicker, ask me the question on the Electronic Dynamic braking topic and I'll go into more detail there.
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DaveP68
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Posted: 07 September 2017 at 9:55am | IP Logged Quote DaveP68

Hi Fred

Have made up an improved 'Power Factor Correction Capacitor' set, version 2 that should give you some improvement with the top end power output.

Here's a photo of it assembled on a circuit board.




It should allow the 12x 1p Delta stator connected to your new 40 - 540 V Grid Tie Inverter to output 1 kW at just over 400 RPM. The peak power output of that new inverter (1.2 kW) should be possible at around 500 RPM.

I'll send it down to you tomorrow so you get it next week.

David
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flc1
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Posted: 07 September 2017 at 10:01am | IP Logged Quote flc1

Gday Kitestrings.
David is correct with his awnser, the new high voltage inverter has a pwm controller, with dumpload resistors which it uses to control voltage, and the 45-90 inverter has dumpload resistors aswell to controll exccess voltage, if you shut off the grid all the generated power goes into the resistors, and stops the turbine sooner or later depending on how strong the wind is. I think it basically shorts out the turbine through the resistors to stop it.
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flc1
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Posted: 07 September 2017 at 10:18am | IP Logged Quote flc1

Nice work , thanks Dave, I look forward to hooking that into the system
Il send that furling controller back to you for a slight tweek to improve things,or if you come for a looksee visit you can pick it up?
Had a bit of wind today and it put out about 1.3 kw.
It seems to start in lower winds than my old turbine,and puts out more power already without going through a storm to do it,
It runs smooth at the mid rpm range so I must have got the blade pitch, tracking and balance right this time.So far its a success, still trying to learn how to operate the new inverter, the pigeon english in the owners manual doesn't help things ,and the inverter only switches on if theres wind, so if there is no wind then the inverter is switched off.

Edited by flc1 on 07 September 2017 at 10:26am
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kitestrings
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Posted: 07 September 2017 at 6:11pm | IP Logged Quote kitestrings

D, flc1,

Thanks for the explanations and congrat's on the progress so far. Very exciting.

Yes, I worked on induction grid-tied turbines for several year (many years ago now). The nice thing with grid-tie, and I knew this was one, is that you always have someplace for the power to go - a load sink if you will - so long as the grid is there. You still face the challenge, as you know, of how to shut the thing down if the grid goes down, or the inverter goes off-line. We had up to 60 kW units that shut-down using "dynamic braking" similar to how many shop tools stop today. Pretty cool.

Splitting hairs now...I generally think of a dump load as something that is using surplus energy, when available, to do something useful; pre-heating water, space heating, ice-making, water pumping as examples. A load-bank I think of as just substitute for load needed, or lost, to match the available turbine output or limit voltage.

Complicating things even further there are "opportunity loads" for PV that are usually called dump loads by folks that are neither.

kindly, ~ks
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flc1
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Posted: 08 September 2017 at 1:35am | IP Logged Quote flc1

thanks KS, you know your stuff
,Im not that sharp on the electronic side of things,just sort of know the basics.,

haveing another moderate wind day today with the turbine getting to or near the 1kw output mark fairly easily,the new inverter amp meter seems to read about .3 of an amp higher than what my analog meters do








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flc1
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Posted: 08 September 2017 at 1:09pm | IP Logged Quote flc1

just had one gust come through which made the turbine put out 1570w

the 45-90v inverter put out 780w for the two stators, and the 40-540v inverter put out 790w for the single stator.
I was under the turbine at the inverter box when the turbine started going hard, I ran away ha!
don't want to be near it if it decides to fly to bits

Edited by flc1 on 08 September 2017 at 1:22pm
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