[Different in simulation result of version 7.3 and 7.2]

Hi,

Apparently I noticed that simulation result from the version 7.3 can achieve daily specific yield 3.9 in the project site which I know it is unlikely to happen based on our experience and monitoring data.

And then I do the simulation using exactly the same setting but version 7.2 (my colleague laptop), and we found that the yield is about 10% lower compare to the version 7.3.

The simulation result of version 7.2 seem closer to the actual result.

May I know why is this happen? 

attached is the loss diagram of both cases. Thanks in advance for clarification...

 

[Power sharing and oversized inverter]

On 7/10/2023 at 11:02 PM, dtarin said:

Which manufacturer said this? You may not want to power share if it cant be done in the field, otherwise you will underestimate your clipping losses. Take for example you have a DC/AC ratio on one MPPT input of 1.0 and on another MPPT input a ratio of 1.4. The latter will have high clipping losses if you don't have power sharing in field. If the DC/AC ratios are similar or the same, then I think you could be fine, but if they are significantly different, I would not. 

I questioned the huawei sale person regarding power sharing between MPPT. and He told me their inverter doesnt has power sharing between mppt.

But when i asked their engineer if I can put CSI 550Wp x 22PV/string for both input of the MPPT. And he said can as long as the number of PV/string is same for both input.

So, I am also unsure now.

Wonder if anyone psychically doing this in field...can share your experiences? 

thanks

[Power sharing and oversized inverter]

Hi, what if the manufacturer said their inverter can't have Power sharing between MPPT? 

if that the case, can we still share the power between MPPT for PVsyst simulation? thanks

[how to set mix orientation]

10 hours ago, Stéphane Metz said:

Dear @garf,

Indeed, it is only possible to mix orientations 1 and 2. This is a current software limitation. If you want to mix orientations 1 and 3 for example, you will have to switch orientation 3 to orientation 2.

FYI, we are currently working on version 8 which will remove a lot of this kind of limitation.

Regards,

S. Metz

I see.. thanks for informing.

actually if I combined orientation 2 and 3 via manage orientation, what would be the impact on the shading loss? thanks

[how to set mix orientation]

Greeting, I have a question on setting the orientation.

Say I have 3 orientations like the following. When I want to have mix orientation, why I can only have Mix #1 and #2? 

How to make the setting so that I can have say Mix #1 and #3 or Mix #2 and #3?

Thanks in advance for advices.

 

[inverter strongly oversized.]

4 hours ago, dtarin said:

Got it... thanks for sharing

[inverter strongly oversized.]

Hi All,

We have an existing 10MWp Solar farm which was using Central Inverter to convert DC to AC.

This farm already 9 years old, and recently we replaced the Central Inverter with 10 units of Huawei SUN2000-100KTL Inverters.

The farm already up and running with the new inverters now.

The PV Panels are BENQ 320Wp old PV Panels as the plants was built 10 years ago. Some faulty PV Panels already replaced with CSI 545Wp PV panels (about 1MWp of it).

I am trying to run a pvsyst the compare the performance.

My question is, we have certain zone of PV panels whereby one of the 100kW inverter is paired with 9 strings x 14PV per string = 40.32kWp. As a result, the inverter is strongly oversized and PVsyst not allow to simulate.

But in actual, when i check from Huawei Fusion, the inverter has no issue running at strongly oversized condition.

I would like to know what setting I need to make in pvsyst so that the system allow my to simulate for the said situation?

thanks in advance for the advices.

 

[module layout setting for multiple orientation solar pv system]

18 hours ago, Michele Oliosi said:

HI ! The tables seem too small for the module size. If you see the text in bordeaux red, you can see that the tables are 2.26 m by 1.13 m while modules are 2.278 m by 1.134.

thanks for pointing out. just noticed that the pv panels i selected is CSI-545W which has different size compared to the pv panel i used in pvsyst...

Now it works.. thanks

[module layout setting for multiple orientation solar pv system]

Hi All,

My 3D model created by using sketchup, and imported to Pvsyst using 3ds file.

My system has 3 orientations, and I am able to simulate the shadow loss using linear shading calculation.

But when I tried to run a more accurate shadow loss analysis using the "module layout".

I have the following problem, when I click "set all module" nothing happened. thus I am not able to configure the next step.

Can anyone enlighten me what I did wrong in this setting?

thanks in advance...

 

 

[how to display module layout in pvsyst report?]

20 hours ago, Lazare Fesnien said:

Dear Garf,

To do this, please click on "PRINT" :

Then check the box "include module layout on final report" :

Regards,

Thanks for enlighten me. 

if you don't mine, can I also check with you is it possible to zoom the near shading picture of the PV module section? thanks in advance
 

[how to display module layout in pvsyst report?]

Hi All, 

can check with you how to do the setting to display my module layout in Pvsyst report?

 

thanks 

 

[Pnom ratio too high, and not allow for simulation]

On 2/24/2023 at 11:51 PM, dtarin said:

I don't know this inverter specifically, but with other string inverters I have worked with, the inputs can be 'jumpered', so that power is shared across all inputs. Power sharing emulates this behavior. Select "use the sharing...." and select all four sub-arrays onto one Inverter config, then press All PNom ratios identical. Since it looks like you have done that (all have Pnom ratio the same), you should be good. 

ok, noted.. thanks for sharing ...

[Pnom ratio too high, and not allow for simulation]

15 hours ago, André Mermoud said:

One of your strings is 550W * 22 = 12.1 kW.  One inverter input allows  100 kW / 10 = 10 kW "nominal".  Therefore putting 2 strings on one MPPT input leads to a PNom ratio = 2.42. which is not reasonable.

In a multi-MPPT inverter like this one, you can indeed charge a MPPT more than the other ones (i.e. define some  MPPT inputs with 1 string, and some MPPT with 2 strings). But not with such an individual PNom ratio (as dtarin said, 1.5 or a bit more).

However if the difference is too high: this will probably not be allowed by the manufacturer, and you will have high current losses in the more charged MPPT.

See the help  "Project design > Grid-connected system definition > Multi-MPPT inverters > String inverters, current limiting"

 

 

 

 

 

 

 

Hi, thanks for sharing your view.

How about if I balance the Power over the MPPT like the following, end up each MPPT is about 1.39 DC:AC?

Some of the MPPT power go up to 17.39kW though.... 

Appreciate your view on this... thanks again

 

[Pnom ratio too high, and not allow for simulation]

6 hours ago, dtarin said:

After having a second look (and since I can't edit), use power sharing for sub arrays 2-5 and balance the DC/AC ratio across all inputs.

I see, so as long as I balance the DC/AC across the input to say below 1.5, it is acceptable right? thanks again 

[Pnom ratio too high, and not allow for simulation]

6 hours ago, dtarin said:

The DC/AC ratio is very high, to the point that the inverter manufacturer may not warrant the product in a PV-only system. The maximum DC/AC ratio according to the datasheet is around 150%, or 1.5, which is fairly common. Is this a DC-coupled battery system?

Hi, thanks for your time reviewing. It is a grid tied system, no battery involved.

 

[Pnom ratio too high, and not allow for simulation]

Hi All,

I have a system where I use CSI 545W PV and Ginlong Solis-100K-5G inverter.

The Solis-100K-5G has 10 MPPT and 2 input per MPPT.

I wanted to configure the following string configuration in Pvsyst. In my sub-array #3, I have 2 x 22PV per string to one MPPT. So, each input of the MPPT has a 22PV per string.

By default, Pvsyst said the Pnom ratio of the MPPT is 2.42... And Pvsyst not allow for simulation.

In that case, can I use Power sharing to allocate more power to the said MPPT and make it pass for simulation?

Thanks in advance for advices.....

 

 

[string configuration]

1 hour ago, Michele Oliosi said:

PVsyst will not calculate like that. PVsyst will simulate the following:

The reason for the difference between warning in one case and error in the other is that (for the warnings only) PVsyst in the first case does only a rough evaluation using the total Pnoms, it doesn't separate the two types of inverter.
If you still want to proceed, you can change the threshold for activation of the error. It is found in the project settings, you can increase the value 3% to a higher value.

I see... Got it... thanks for advice

[string configuration]

Greeting,

I have a project where we design based on CSI PV 665Wp and Huawei 330KTL inverter.

The 330KTL inverter has 6 MPPT with 28 inputs.

Total DC power is about 45MWp and AC power is 30MWac.

So I have total 2,114 strings x 32PV per string, distribute to 100 unit of inverters.

When I configure like the following, the DC:AC ratio is 1.5. The inverter power is slightly undersized, but PVsyst still allow to simulate.

If we divide 2,114 strings to 100 inverters. Each inverter will have 21.14 strings. 

But in actual, we can't have 21.14 strings per inverter. So I need to have 86 inverters with 21 strings x 32PV per string; and 14 inverters with 22 strings x 32PV per string.

When I configure this way, Pvsyst says inverter power is undersized, and not allow to simulate.

 

So, in this case does it mean 45MWp to 30MWac is not achievable? or what setting I need to change? anyone can share your view? thanks in advance

 

[question on power sharing]

On 1/15/2023 at 6:00 PM, kritosin said:

I also thank you because I think that I got what I am looking for and also participate in this thread.

Welcome...

[question on power sharing]

On 1/3/2023 at 5:54 PM, Michele Oliosi said:

Hi @garf, I see that you have a total of 7 MPPT used on the 9 MPPT inverter.
Probably when you set up the Power sharing, there is an error message appearing in red because of that; this will prevent you from completing the power sharing setup.

To correct this situation, since we do not allow empty MPPT inputs in PVsyst in the multi-MPPT / power sharing mode, you can artificially change the number of MPPT in your inverter to 7 for the concerned strings. You can edit this in the inverter definition, making sure to change the inverter name and file name, and save as new, as to not to confuse both inverters in the list (with 7 and 9 MPPTs).

i see.. thanks for the advice....

[question on power sharing]

Greeting All,

I found that every time after I did "power sharing", run simulation and save.

My setting for the "power sharing" will gone and restore to default. Hence, if I wish to run simulation for other variant I need to redo the "power sharing".

Wish to know if anything that I missed out to avoid the above matter?

Thanks in advance. 

[how to set the string configuration in this case]

On 11/7/2022 at 4:23 PM, Michele Oliosi said:

At the moment you cannot set different strings on the same MPPT within PVsyst. However you could modify the inverter and add an extra MPPT. As long as you are careful with the "power sharing" configuration, it can be a good representation of your system.

I see... thanks for sharing

[how to set the string configuration in this case]

17 hours ago, Lazare Fesnien said:

Hi,

You have an inverter with 10 MPPTs and in your case you tell PVsyst that you are using 11 of them. 

PVsyst doesn't yet allow you to wire two different characteristic subarrays to the same MPPT input.

Hi, thanks for the reply.

actually my aim is to use both input of MPPT10, one input for 15PV string and another input for 16PV string. 

for my case, how shall I configure in the setting then? thanks again 

[how to set the string configuration in this case]

Hi,

I would like to ask how to set the following string configuration in Pvsyst:-

Let say,

I use CSI 545Wp PV panels; and Ginlong Solis Inverter Solis-100K-5G (10 MPPT and 2 input per MPPT)

9 string x 22PV per string (MPPT 1 to 9)

1 string x 16PV per string (MPPT 10 input 1)

1 string x 15PV per string (MPPT 10 input 2)

Total Power shall be 229PV x 545Wp = 124.8kWp.  124.8kWp / 100kW, my DC:AC shall be 1.248

 

But when I configure like the following photo in PVsyst, the inverter quantity become 1.1 unit, and AC power become 110kW.

How to configure correctly per what I want (1 unit inverter instead)?

Thanks in advance

 

 

[More than 8 orientation, and cause error after imported 3d scene into pvsyst]

thanks for feedback and advice.

Recently I have another issue regarding the shading analysis.

When I import the 3D scene of my 3.5MWp project in pvsyst, i only took a short while to import the 3d model of the project (export from sketchup, 3ds file).

After that project, I noticed Pvsyst took a very long time to import 3ds model export from sketchup (for my other small project). many times it just hang there and unable to process further in importing 3ds file.

Wondering what went wrong.

thanks if anyone can advise.