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laxmi narayan ojha
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Join Date: Nov 2013
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Losses In Solar Power Plant

11/04/2013 3:02 AM

good morning all,

i am from solar plant located in bikaner.

in our plant ring main unit process is available.11kv/350 v power transformer is available in each unit.6 nos units are connected with the ring through OUT DOOR RMU .all 6 units are different capacity like 1 MW,2MW,1.12MW,250KW,and two others are 1 MW each.

LV side cable 300 sq-mm(3-c armored),and ring is based on 185 sq mm.HT side. cable length is total 3.9km up to pooling station.(6.3MVA) ring is not complete at last end.

please provide me that data if we are loosing kwh cause of cable of else??and how can we calculate the losses.

in dc part,1 MW is DC but Inv is 945 kw.module rating is 8.1 amp current,36.4 voltage, and 20 nos of module in a string.(4 sq mm every where) plant area 4 ekar for 1 MW.

junction box to invetrer cable is 95 sq mm (copper),and same.the distance of each junction box to inverter is diffrent,(40m to 120m).

thus we cant achieve proper kwh in a day,please tell me how can we improve our generation and calculation of losses.

if any query require,ask me asap.

thanks in advance
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PWSlack
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#1

Re: losses in solar power plant

11/04/2013 3:26 AM

The abbreviation <...asap...>, which is short for "as soon as possible", is a much misunderstood term. It might not be possible for several years, given current workload, and in the absence of other information that makes it the same as "low priority". Such a label would put it at the back of the queue.

At least with a deadline, the Client has a choice: either wait patiently for something to happen, or take the business somewhere else.

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RAMConsult
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#2

Re: Losses In Solar Power Plant

11/04/2013 10:20 AM

You are working at a United Nations funded solar facility, the only appropriate source of help is the contractor who designed/installed the system.

Hint: you are looking in the wrong place for inefficiencies, unless the cabling is grossly undersized or poorly installed, copper wiring is the least lossy thing in your plant, look elsewhere.

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Fredski
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#3

Re: Losses In Solar Power Plant

11/04/2013 1:18 PM

since you have multiple units and an output you feel is under performing your expectations wouldn't it be logical to test each unit individually and go from there? a contract as big as this must have been must have a list of contractors that performed your original installation, why are you consulting strangers on the internet for such an important topic??
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dvmdsc
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#4

Re: Losses In Solar Power Plant

11/04/2013 5:53 PM

If you are using regular 156 X 156 mm solar wafers, your current seems to be OK to me. Is this a new plant and do you have a history of produced kW per day?

Your inverter working voltage = 20 X 36.4 Volts by 8.1 Amps what seems good to me too. 4 mm2 wire to the panels is also doable.

When you produce 945 kW out of 1 MW panels, that could be good either. My guess, with the ample info you provide is that you need more sun or less clouds. I cannot help you with that part.

Get yourself a DC clamp on meter (or install a proper permanent monitoring system) and start measuring your amperage in your different strings.

It would help us when you give some info about the inverters and how you made the ring. First start with the DC part per string and extend your measurements to your inverter outputs on a real time basis (measuring and building history with 2 systems simultaneous) Here you can inform us about these losses. We will pick up after we get the info. D

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Fredski
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#5
In reply to #4

Re: Losses In Solar Power Plant

11/04/2013 5:55 PM

I believe the project is using CIG panels
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dvmdsc
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#8
In reply to #5

Re: Losses In Solar Power Plant

11/04/2013 11:03 PM

I am in doubt now, so I'll follow your advise. (I hope they haven't used these)

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Fredski
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#10
In reply to #5

Re: Losses In Solar Power Plant

11/05/2013 7:41 AM

SE posted a pdf from what he believed what from this project, after skimming through it I think he was right, its a CIG project
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PFR
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#6
In reply to #4

Re: Losses In Solar Power Plant

11/04/2013 10:42 PM

did you work on this project?

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dvmdsc
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#7
In reply to #6

Re: Losses In Solar Power Plant

11/04/2013 10:51 PM

I would be giving answers if I did. Not asking questions. But I have 38 years on it. Just try to get more info. My crystal ball doesn't reach that far.

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Wal
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#9

Re: Losses In Solar Power Plant

11/05/2013 4:23 AM

Back of a beer coaster here....

4 acres is around 16000m2

PV yield is generally around 100Wp/m2

Well that's 1.6MWp so that's in line with the 1MW power rating.

Useful insolation at say 6 h/day

Disregarding transmission and conversion losses....

16000x100x6= 9600kWh/day capacity (approx)

How much were you expecting to produce? What's the shortfall look like?

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SHOCKHISCAN
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#11

Re: Losses In Solar Power Plant

11/05/2013 7:01 PM

If I understand you correctly your system is operating at 94.5% efficiency.

Assuming normal system dynamics due to:

1. The angle variation in the panel frames caused by human imperfection during design, manufacturing, and installation.

2. The unstated conversion efficiency rating of your panels.

3. The variation of sunlight ray intensity allowed to reach the panels caused by ambient atmosphere entrained with dust, moisture, sand, smoke, etc.

4. Nominal circuit IR losses due to high equipment temperature.

I would say that your system is working rather well if you are indeed attaining 94.5%.

Or did I missunderstand something?

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dvmdsc (3); Fredski (3); PFR (1); PWSlack (1); RAMConsult (1); SHOCKHISCAN (1); Wal (1)

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