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cosmos
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Join Date: Aug 2010
Posts: 5

Solar Power

01/03/2011 9:41 AM

Concerning inverters, how do they achieve in-phase voltage with the utility and what keeps the utility from back-feeding power during overcasts?
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JRaef
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United States - Member - New Member Engineering Fields - Power Engineering - New Member

Join Date: Sep 2006
Location: California, USA, where the Godless live next door to God.
Posts: 4665
Good Answers: 804
#1

Re: Solar Power

01/03/2011 11:25 AM

First off, not all inverters inherently synchronize with a utility feed. Only those identified as "grid tie" inverters have the necessary transducers to do so.

So that's what they do, they have transducers that determine the phase angle of the utility sine wave, and that information is fed to the firing circuits of the output transistors to match and make sure the power only flows one direction. It's all just software at that point.

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cosmos
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Join Date: Aug 2010
Posts: 5
#2
In reply to #1

Re: Solar Power

01/03/2011 12:50 PM

Thanks! Sounds simpler than the safeguards of parrelling small gensets with the utility's grid.
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tcmtech
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Join Date: Jun 2009
Location: South of Minot North Dakota
Posts: 8376
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#3

Re: Solar Power

01/03/2011 2:09 PM

Here is my write up on the subject regarding simple DIY designs I designed and developed myself.

Its more of a low tech analog based design but the concepts have proven themselves very reliable and easy to adapt to many types of input power sources and utility service connections.

http://www.electro-tech-online.com/alternative-energy/86777-grid-tie-inverter-schematic.html

http://www.electro-tech-online.com/alternative-energy/105324-grid-tie-inverter-schematic-2-0-a.html
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alba16384
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Join Date: Dec 2006
Location: Chelmsford, Essex, England
Posts: 28
#4
In reply to #3

Re: Solar Power

01/05/2011 6:02 AM

Sorry, but this link only got me onto the electrotech website. Can you provide me with a better pointer?

Regards,

Tony Lee.

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tcmtech
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Join Date: Jun 2009
Location: South of Minot North Dakota
Posts: 8376
Good Answers: 775
#5
In reply to #4

Re: Solar Power

01/05/2011 11:46 AM

Go to the renewable energy section and then the alternative energy sub section in that.
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