hello, im a student, i have been looking for a most advance Pure Sine Wave Inverter, from 12Vdc to 240Vac inverter. Please send me a full circuit diagram with it full explanation to my email- jeffrey_5097@yahoo.com or here.



Thanks.........

 

Please scan and post.
thank you

 

I have read all the pages of this forum as well as the one that started for the 250watt specific unit. I am starting to produce a circuit design similar to the ones described here hoping that the power company will work with me.

I was looking to use a wind design and live in the middle of a city, but the city requirements for a tower is that it has to be less then 100 ft tall (I don't plan on making mine anywhere near that), but I was looking for monitoring software that I could tie some type of tach unit to and stick up at various heights to test which elevation would work best.

Any ideas what and where I could find this, I have been looking around, but haven't found anything that fits the bill.

 

Hi there,


First thing you should check with your local power company.
You have to at least find out if they allow grid tie inverters in your area.
Second, you have to find out what the required spec's are for something
that is tied to the line like that, such as what is the maximum level of
the harmonic distortion allowed and maybe even how often you can allow
your unit to tie and untie from the line in any given day. There may be
other spec's that they demand so you better check first.

 

Maybe I missed it, but has anyone here talked about PFC for a Grid Tie Inverter? I'm trying to figure out how it would be done, since you are trying generate a voltage waveform to closely match the grid, how would you regulate the current to track the voltage?

(First time post)
thanks,
Omer

 

Hi,

Actually, if you set the voltage to match the line before contact, then switch
to current generator mode, you turn the inverter into a current generator and
then you just regulate the current. The voltage goes to whatever it has to
be to match the line...that's how a current generator works.

 

It depends on how you build the GTI for the most part. I prefer simple and rugged and use a simple LC tank setup on the line side both for filtering and for power factor correction.
Without knowing what you are working with its impossible to say exactly. Still to correct possible line hash or harmonics issues a filtering system is needed. And if the filter capacitors are of the correct size the power factor will say fairly close to 1.

__________________
"Issue a general safety warning. Then look the other way and allow stupidity the chance to eliminate itself." -- tcmtech
"Those who can, Will. Those who can't, will achieve positions of power over those who can and then promptly stop them." -- tcmtech
"Your impossibility may just be my day to day routine." -- tcmtech

 

A couple of things to keep in mind.

1) the mains waveform, when loaded, may not be a perfect sine wave - if you use it as a reference, you only make it worse. Best to create your own.

2) reactive loads will cause back-emf - ie, the load will produce a possibly quite high voltage and you need to absorb it somehow.

 

How to filter the inverter output?
I have 250V pk at the MOSFETS.
10 volts pk at the output of the first LC filter.
0.4 volts pk at the output of the second LC filter.
I am 25db over FCC specs.
I can see that a simple LC filter will never work.
Any ideas?
thanks

 

Hi Val, nice elegant line waveform tracker with digital adjustable attenuator for power point tracking via microcontroller. But how will you mitigate the feedback coupling when HVDC and both "240 VAC" line connections are hooked up together? Won't the circuit behave differently since it will then be sensing its own output?

 

Hi i am from India, I have developed a 2000W permanent magnet alternator which is designed to perform in very low wind speeds and have designs for a 25kw permament magnet alternator model, my idea is to provide a GTI so that the load can be supplied directly from the Permanent Magnet Alternator without storage batteries

 

That sounds good, in principle anyway. What's going to power your load when the wind stops? Or when the wind is going up and down every coupld of minutes?

 

coimbatorean: you are just a dreamer. You have developed the generator in your MIND.
Stop wasting our time with your DREAMS.

 

I wouldn't go that far as to dismiss it so entirely.
His concept is feasible but would prove it self most likely impractical and at times very limited as to what it could actually power by itself.

Being that he mentions grid tyeing it he wouldn't need a battery because the grid will work as the battery. That would allow the varying output of the generator to work while still keeping that loads supplied with a reasonably stable power source.

__________________
"Issue a general safety warning. Then look the other way and allow stupidity the chance to eliminate itself." -- tcmtech
"Those who can, Will. Those who can't, will achieve positions of power over those who can and then promptly stop them." -- tcmtech
"Your impossibility may just be my day to day routine." -- tcmtech

 

I agree. He also said it was suitable for very low wind speeds. A generator with a very low cut-in speed might be able to provide many hours of continuous power, although that would requires a much larger windmill so it may not be as cost effective as a setup optimised for higher wind speeds.