Thanks, i was just thinking, such a changeover switch woudl maybe be a fairly bulky contactor in most households. Also, its difficult to see how the switchover from grid to "islanding" and vice versa would be seamless...some mains connected devices may reset or go into fault, whatever?as the domestic load increases the mains will be seamlessly re-connected ( easy ).
Thanks, and as you know, the grid itself is not a unity power factor corrected current source.......since if a non PFC'd equipment draws a high reactive power, the mains will simply supply it. So this is interesting.GTI's are unity PF current sources
As I said when that time comes, regulators will cut-off major contributors and expect storage be added . During the over voltage situations, a proposed system will be deactivated and the energy storage system will get power from the grid; as a result, the grid voltage will decrease to an acceptable level.Thanks, and as you know, the grid itself is not a unity power factor corrected current source.......since if a non PFC'd equipment draws a high reactive power, the mains will simply supply it. So this is interesting.
When GTIs pump energy into the grid, they always raise its voltage by a little bit....a lot doing it will raise it significantly.
I don't know where you get a lot of your assumptions - but 100A single phase or 50A 3 phase contactors are readily available and cheap, an inverter simply has to match phases and the contactor can close without fuss or issue,Thanks, i was just thinking, such a changeover switch woudl maybe be a fairly bulky contactor in most households. Also, its difficult to see how the switchover from grid to "islanding" and vice versa would be seamless...some mains connected devices may reset or go into fault, whatever?
Yes i see your point...the thing is, if shedloads of houses in a neighbourhood are generating loads of energy and exporting it to the grid, then the mains level will obviously go up.....(Sunnyskyguy appears to agree with this, and sugggets that he believes that the authoirities will deal with this issue)and further, control of inverters is progressing to the point where - with a CT on the incomer - the inverter can modulate its output to match the exact load current of the house - negating a real need for an isolator
Thanks, but the only way to handle this, is for people to stop using GTI's.I can't comment on any regional problem, but if homes have solar GTI's with a problem, the regulators have to expect this and have a process to handle it.
You seem to be overly focused on absolutes, if the grid goes to 245Vac, it cannot go any higher due to local GTI's as these all have limits, if you want to use your own power then you have to disconnect if the volts are that high, if the volts are closer to 230Vac say then a modern inverter can control its o/p to match the household loads - by matching current profiles ( CT on the DB ) .... QED.1....The "axis point" of this entire argument, is that a Grid tied inverter, when it exports energy back to the grid, will, inevitably, slightly raise the voltage of that grid.......higher than it would have been if everything was just powered by the local power station....if this axis point is wrong, then please advise?
2....The follow-on point from this, is that GTI's will not connect to the grid if the grid voltage is too high.
..put 1 and 2 together, and you get some interesting, and possibly not very nice , outcomes.
We use cookies and similar technologies for the following purposes:
Do you accept cookies and these technologies?
We use cookies and similar technologies for the following purposes:
Do you accept cookies and these technologies?