Converter rated power  

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(@mujaheeda)
Active HOMER

I am new to HOMER and currently I am simulating Wind/PV/Grid system and comparing it to the actual system that has been built. I have a couple of questions to ask:

1. I noticed that the the wind turbine never reaches its rated power of 500 kW. I am wondering why this happens? In real condition, the wind turbine reaches its rated power at least 10% of the time. 

2. Also, I've put 0-1750 KW (as the actual system size)  in the search space for solar converter but in the optimisation results, HOMER always suggests 1400 KW converter. Is there any way to change this? I am trying to get simulation results as close as possible to the actual system.

Thanks!

 

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Posted : July 5, 2017 5:28 am
(@dhiwaakar)
Illustrious HOMER Admin

Hi Umdatul,

1) a) The wind turbine output depends on the available wind resource and the wind power curve. Make sure, in the power curve, you have defined the wind speed for the rated power. You can find the power curve in the wind turbine design section.

    b) Make sure the wind resource has the wind speed that corresponds to rated power.

2) Since you have mentioned a range of sizes (0-1750 kW) for the converter, HOMER chooses the optimal size required as per the PV output produced. If you want a fixed converter size(s), instead of mentioning the range in HOMER optimizer, you can mention specific sizes in the search space. For example, mention 0,500,1000, 1500,1750 in the search space to consider all these sizes. Hope this helps.

 

Best Regards,

Dhiwaakar Rajasekaran

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Posted : July 6, 2017 1:16 pm
(@mujaheeda)
Active HOMER

Hi Dhiwaakar,

Thank you for your suggestions. I've put 1750 Kw in the converter search space and it worked. 

I've also updated the wind turbine power curve and have made sure the wind speed in the wind resources exceed the wind speed corresponding to the rated power. However the simulation results were still the same i.e. it never reaches the turbine rated power. It reaches its rated power only when the turbine losses are zero, which is of course impossible. Do you have another suggestion I could try?

Thanks! 

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Posted : July 10, 2017 5:09 am
(@dhiwaakar)
Illustrious HOMER Admin

Hi Umdatul,

 

Have you accounted for turbine losses in the wind resource? i.e., have you made sure the wind resource is high enough to produce rated power after turbine losses? If this doesn't work as well, send me the HOMER file and I can take a look at it.

 

Best,

Dhiwaakar Purusothaman

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Posted : July 10, 2017 10:13 am
(@mujaheeda)
Active HOMER

Hi Dhiwakaar,

I have looked at the windspeed data and it seems some of it is high enough to generate the rated power even after accounting for losses. Here are the HOMER file and the actual wind speed data. FYI, there are two wind turbine Enercon E-48 (500 kW) and 3 Vestas V-52 (850 kW, total 2.55 MW) which all never reach their rated power. I hope you can give me advice on this. Thank you very much.

 

(wind speed data)

  https://uoe-my.sharepoint.com/personal/s1601023_ed_ac_uk/_layouts/15/guestaccess.aspx?docid=19a0cc443b9f74e3381840b3ee3ec7824&authkey=AcboJv0J54GI1Wi_5D_sUSo

(HOMER file)

https://uoe-my.sharepoint.com/personal/s1601023_ed_ac_uk/_layouts/15/guestaccess.aspx?docid=1dc597a78ac8e40fb8b412f3abce52ed0&authkey=AWQW40Qslh2xXkq80SjgYiE

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Posted : July 12, 2017 8:34 am
(@dhiwaakar)
Illustrious HOMER Admin

Hi Umdatul,

 

The rated capacity of the wind turbines are 800 kW and 850 kW. However high the wind speeds maybe, under ideal conditions ('0' loss factor), the maximum power that the turbines can produce are 800 and 850 kW. You have mentioned about 9.63% as turbine losses. So the maximum output of the turbines will definitely be lesser than the rated output. Getting rated output from the turbines is an ideal situation.

 

Best,

Dhiwaakar Rajasekaran

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Posted : July 12, 2017 10:59 am
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