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| AC in to AC out grid Tie.. |
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| mrpackethead:
I'd rather not discuss the why.. however... If i had a 'cheap' supply of 230VAC 50Hz Power ( or possibly 415V 3phase), and i wanted to push that back onto the grid , how woudl you go about doing it. You can assume that the two systems will be in phase. |
| capt bullshot:
Assuming systems are in phase (at no phase shift), you'd have to insure the cheap supplying system voltage is "somewhat" higher than the grid voltage and connect it. That would ensure energy flow from the cheap source to the grid and would keep the systems in phase (grid always wins or fuse blows). How to do that, depends on your source. Some primitive systems like a water mill just use an induction motor (as generator) to achieve the goal. For some kind of unknown source of unknown properties, but with a stiff voltage and grid-locked phase, one could imagine a "weak" step-up transformer a a coupling element. |
| mrpackethead:
--- Quote from: capt bullshot on October 23, 2018, 08:28:00 am ---Assuming systems are in phase (at no phase shift), you'd have to insure the cheap supplying system voltage is "somewhat" higher than the grid voltage and connect it. That would ensure energy flow from the cheap source to the grid and would keep the systems in phase (grid always wins or fuse blows). How to do that, depends on your source. Some primitive systems like a water mill just use an induction motor (as generator) to achieve the goal. For some kind of unknown source of unknown properties, but with a stiff voltage and grid-locked phase, one could imagine a "weak" step-up transformer a a coupling element. --- End quote --- The strange situation is that the 'input' energy source would in fact be the same grid as the grid that power is being supplied to. Theres a crazy pricing scheme which makes this a viable proposition. Using a transformer, how would you limit the current.. |
| capt bullshot:
--- Quote from: mrpackethead on October 23, 2018, 08:32:56 am ---Using a transformer, how would you limit the current.. --- End quote --- By impedance, either inherent to the transformer or something external, preferably reactive, not resistive. The transformer ideally would have a range of fine steps to adjust the voltage difference which in turn controls the current through the impedance. |
| sibeen:
This is done by thousands of inverters already in New Zealand. They're called solar inverters :) OK, firstly the safety shit. Any grid connect inverter in Australia or New Zealand needs to comply with AS/NZ 4777. This is for safety of the user but even more importantly the safety of electrical workers who may be performing work on lines that are connected to your inverter. If you decide to connect something to the grid without taking into account the strict guidelines and rules around anti-islanding then you could be a gaol term waiting to happen. This is not to be stuffed around with. |
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