Grid tie Inverters Design Query
Grid tie Inverters Design Query
(OP)
Dear All,
I am currently working on a design of Grid Tie Inverter where the source of power is from a Lead acid battery. The inverter converts the DC to AC and will feed it the Grid.
In low power range of less than 200W boost converter are used to step up the DC and then convert this voltage to AC.
But my design has a minimum power of 1000W (1KW) and higher (3KW, 5KW etc) designs are in pipeline. The Mains voltage is 230V
My doubt here is that can this be achieved with boost convertor or its better to use a transformer where the low voltage AC can be stepped up to high voltage AC. I have this query cos i have seen some 5KW Grid Tie inverter which are sleek and lightweight, so i doubt if the design is transformer based.
I am currently working on a design of Grid Tie Inverter where the source of power is from a Lead acid battery. The inverter converts the DC to AC and will feed it the Grid.
In low power range of less than 200W boost converter are used to step up the DC and then convert this voltage to AC.
But my design has a minimum power of 1000W (1KW) and higher (3KW, 5KW etc) designs are in pipeline. The Mains voltage is 230V
My doubt here is that can this be achieved with boost convertor or its better to use a transformer where the low voltage AC can be stepped up to high voltage AC. I have this query cos i have seen some 5KW Grid Tie inverter which are sleek and lightweight, so i doubt if the design is transformer based.
Thanks
Regards
Gokkul





RE: Grid tie Inverters Design Query
If the product procurement Ts&Cs includes a legal notice that attempts to ban 'reverse engineering', then double check with your lawyer. Perhaps buying 2nd hand would leave such Ts&Cs behind.
You could also search the USPTO.gov website for applicable keywords.
RE: Grid tie Inverters Design Query
Thanks
Regards
Gokkul
RE: Grid tie Inverters Design Query
In other words, if a project team is considering Plans A, B, C, etc., then begin execution of the long leadtime, low investment activities of all the even-slightly-likely Plans at once.
Hopefully someone with directly applicable grid-tie inverter experience will join in eventually. Good luck.
RE: Grid tie Inverters Design Query
At your power range a boost stage is not unreasonable. It'd be worth trying to specify your battery voltage as high as possible to minimise losses in the boost stage. 5kW from 300V batteries is probably fine. As your battery voltage falls, the advantages of a transformerless design start to diminish.
Here's a good start for a comparison of transformer/transformerless topologies:
http://ieeexplore.ieee.org/iel5/41/5662271/0506731...
RE: Grid tie Inverters Design Query
You read my mind :).
My doubt exactly that if the battery voltage is too low then a inductor based system will be complex. I will look into the problem and try to design the system so that the battery voltage remains high enough for minimum boost of voltage.
Thanks for the feedback.
Thanks
Regards
Gokkul