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Home » Solar Energy » Grid tied inverter for On Grid solar plant without energy storage
Grid tied inverter for On Grid solar plant without energy storage
Let us take an example of a commercial premises which generally needs power of size around 50-100KW during day time only and is provided with On Grid Solar Plant i.e. No battery for energy storage to save upon the investments.
In absence of Grid but with full sun available, we wish to use the solar power to supply the local load after disconnecting from GRID.
1. Can we use a small DG set or an UPS of size just 1 KVA to generate the waveform which the "ON GRID Solar plant" needs to follow.
2. If yes, how the local load of 50-100KW will be shared by the solar plant and the DG Set or an UPS of such a small size (because the purpose is only to generate the waveform)
The question here is a grid tied inverter which generates and synchronizes power to grid without any storage. This will work fine as long as the grid is stable and available. When the grid fails, the grid tied inverters go for a stand-by mode for anti-islanding protection. During this condition it is possible to trick an inverter to follow a DG generated out put in an isolated grid, but we would require a higher DG power to avoid any reverse current into DG. The ratio between solar PV and DG production is not clearly established.
Micro inverters add 40% more cost over standard inverters. All micro inverters are limited and are only single phase. Micro inverters take more time to install plus it would be very hard to synchronize each little inverter. I think it is better to stay with the true and tried pure sine inverters for grid tied applications. I am not sure that they can handle India's voltage problems nor are they a good solution for starting inductive loads.
If the loads connected to the "grid" can be managed to match with the PV power being made available, then with suitable controls, it will be possible to have an ON Grid Solar PV System supply power based on the use of a small UPS or a small DG as the commutating source.
In absence of Grid but with full sun available, we wish to use the solar power to supply the local load after disconnecting from GRID.
1. Can we use a small DG set or an UPS of size just 1 KVA to generate the waveform which the "ON GRID Solar plant" needs to follow.
2. If yes, how the local load of 50-100KW will be shared by the solar plant and the DG Set or an UPS of such a small size (because the purpose is only to generate the waveform)
The question here is a grid tied inverter which generates and synchronizes power to grid without any storage. This will work fine as long as the grid is stable and available. When the grid fails, the grid tied inverters go for a stand-by mode for anti-islanding protection. During this condition it is possible to trick an inverter to follow a DG generated out put in an isolated grid, but we would require a higher DG power to avoid any reverse current into DG. The ratio between solar PV and DG production is not clearly established.
Micro inverters add 40% more cost over standard inverters. All micro inverters are limited and are only single phase. Micro inverters take more time to install plus it would be very hard to synchronize each little inverter. I think it is better to stay with the true and tried pure sine inverters for grid tied applications. I am not sure that they can handle India's voltage problems nor are they a good solution for starting inductive loads.
If the loads connected to the "grid" can be managed to match with the PV power being made available, then with suitable controls, it will be possible to have an ON Grid Solar PV System supply power based on the use of a small UPS or a small DG as the commutating source.
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