I need to connect a low power PV plant to grid with Bi-metering facility in a Residential application. Is it possible to inject power from low potential side to high potential grid side..
@U.Dreher
But in real time while using bi-metering system even though we are using power inverter, grid pressure will dominating over generated power and stops the power flow from low power source to grid.
No.
The difference between off-grid and 'online' operation is in the control algorithms:
Hope this makes things clear(er)
Hi Natarajan,
While Mr. Dreher has pretty much summed up the broad approach, I must add that once the two parts are implemented, the residential PV plant must meet certain stringent operational standards before it can be integrated within the utility network!
Regarding this, power authorities have different standards of performance, so you are required to obtain clearance from local authorities before such an attempt can be made.
Please consult your local power administration to figure out the norms that you need to follow.
-Sanjay
Dear Natarajan,
The replies to date have provided good information, but please permit me to add some cautionary notes. While it is technically feasible to couple a “low power solar system” to a small battery (for stabilization) and then to connect a “grid tie” inverter to the battery which permits synchronization to the grid via the local distribution system, the simplicity of this approach can cause hazards.
I provide these comments as reading further down your research notes, it appears that your interest is to make the inverter work without grid reference.
Simply connecting the inverter AC output to an AC receptacle supplied from the grid / local distribution system via transformer and meter can create a hazard to utility workers. Supposedly, if the synchronizing supply from the grid is lost, the grid connected inverter should disconnect, but in the event that it does not (and you no doubt are aware that even well designed systems can sometimes fail) then in the event of a grid / local distribution system outage the inverter supply can result in “back feeding” the grid through the transformers and thus keep a high voltage on the utility wiring. This can present a life-threating hazard to utility workers who arrive to repair the reason for the grid outage, who believe that the lines are de-energized.
It is for this reason that in many jurisdictions there is a requirement for a “transfer switch” to be installed before adding any sort of local supply, so that the local supply can only be connected to the downstream load if the utility supply is cut off.
The intent of this somewhat wordy answer is to caution you to ensure that the consideration of potentially creating a hazard to utility workers is carefully considered before connecting downstream supplies that can back feed the grid. If you are connecting what is indeed a “low power system” then the cost of these precautions may well be higher than the benefit derived.
All the best,
Bill Palmer
of course you can. I did installed few PV systems ranging between 0.5 kW up to 50 kW grid connected systems. Some of them single-phase and others three-phase. I agree with Bill Palmer that the "the cost of these precautions may well be higher than the benefit derived". You need to check the feasibility. Furthermore, you need to check the utility policy, specification and regulations.
Yes its possible as mentioned earlier. However, we need to consider the rules laid down by the Power Utility which are controlling the Grid. There will be limitations regarding amount of Power (based on transformer size), Net Metering conditions, and Reactive Power conditions.
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