Grid interconnection of renewable energy systems is gaining more & more importance day by day. The application of PE converters play vital role in grid interconnections. 10's of converter topologies are available (e.g. H-bridge, Multilevel, Interleaved, etc.), out of these which converter topologies are being used currently for grid interconnection of RE systems?
Converters for interconnecting DC microgrids with utility is my topic of interest.
Thank you.
Hi Prasad,
Your question by the way, has to do with connection of PV systems with AC grids, not with DC microgrids !
Anyway, assuming that you are indeed talking about the configuration (as I have put in bold above), I would say the most popular PE converter interfaces consist of two part:
With best wishes.
-Sanjay
Generally we will use converters accroding to the type renewable energy sources
1.if we generate power from solar then we will use the choppers in choppers also boost chopper because it will increase the output voltage and also with less ripple from that we will convert ac by rectifiers
2. if we use the wind energy system then we will use the inverters these inverters also we will use the multi level inverters becoz the thd is low
but the main problem of using these converters the efficiency of the system will decrease it stage conversion process...
thanking u sir
Respected Sanjay sir,
Thanks for your answer.
So as per your answer, we are still using DC-DC boost converters for keeping specified DC link voltage & in case of converting DC into AC we are still stuck with normal inverters(in some cases multilevel inverters). That's OK.
Talking about DC microgird, I'm thinking of centralized inverter to connect my DC microgrids DC link to AC utility grid. Will it work?
And yes, I think sensing of phase angle & frequency is also essential along with sensing of grid voltage.
Isn't it?
Dear Santhoshji,
I think in first point instead of rectifier, there should be inverter. And also, system efficiency dose not drop much as electronic systems work at efficiencies greater than 95%.
Thanks & regards,
Prasad.
Dear Prasad Joshi,
The central inverter should work provided you provide an appropriate control mechanism. Yes, phase angle and frequency are important for grid connected inverters.
Hi Prasad,
I think it may work provided you take care of four distinct aspects:
- Design to accommodate MPPT controllers on various sources in a well coordinated manner.
- Adequate design margin so as to cater to multiple source integration, and possible overloaded operation.
- Suitable control, inclusive of the requirements of different sources.
- Properly designed protection system which must accommodate all the renewable sources that you wish to integrate.
With best wishes.
-Sanjay
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