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Showing results for tags 'MPP Range'.
Dear developer team, I hope my message finds you very well, I have an question which is so urgent please. This simulation I have been doing is critical to the point that many decisions will be taken on for this already running PV system. I'm acting as a consultant for this system hence results and its explanation is important. My question is why for this project (project file and PDF simulation report are attached) the losses due to down regulation on the account of mpp voltage is so high? it represents almost 9% of the annual losses? I can see that the operating voltage is operating normally and within the range of the MPP voltage of the inverter, however there are lots of self-shading as you can see in the 3D design and the energy balance. Could this be the reason? and what's the physical explanation to these down regulation losses? does it mean for example that there are many times during the year that the operating voltage will fall behind or beyond the MPP tracking range? I don't get it. Will a minutely simulation will be useful in this case? could the inverter be the reason? Please advise as the situation is critical and thank you for your usual great support! Sharm Bride Hotel - Actual - 9 Sept R02.pvprj Sharm Bride Hotel design & simulation - as built - 13 Sept R02.pdf
Good morning, I am considering the following configuration of 5 strings of 18 modules each with the 20KTL Huawei inverter and AC-300M/60S modules: That is, not the typical configuration of two identical strings per MPP, as the current would be too high: I understand that the first configuration is possible, but I'm not sure how the connection would be done in the "real world". Would it be a string per MPP input entrance, leaving the sixth unused? How would the inverter know I'm not following the second configuration, which is not allowed? Thanks in advance, kind regards, Ricardo
Hello everyone, I would like to ask a question about the losses about regulation on account of MPP Voltage Range. Actually I work on effect of MPP range on total energy yield and now I use trial version of PVSOL to check whether the software gives expected results or not. Minutely simulations are supposed to seize the instantaneous voltage drops on PV arrays due to momentary low irradiance values that exist quite frequently in cloudy weathers. So inverters whose MPP range extends towards lower voltages can keep operating with relatively high efficiencies compared to the inverters with narrow MPPT range in low irradiations. In order to test this situation, I made a simulation. Simulation parameters are given as follows: - Location: Berlin/Germany - "Simulate the irradiance with synthesized minute values" option is checked. - PV Modules: ASUN250-M (A-sun by Aton Energy), 400 Modules (20 Strings, each string has 20 series modules), 100kW PV Nominal power - Inclination is 30 degree, azimuth is 0 degree. - Installation type is roof parallel. - Inverter is PVS800-57-0100kW-A (100kW Central Inverter of ABB), its MPP voltage range is defined as 450V-825V. - Other options are set as default. After this simulation, a virtual inverter is defined. Parameters of this virtual inverter is exactly same with PVS800-57-0100kW-A but its MPP range is specified set as 100V-825V. And same simulation is repeated with this new virtual inverter. Comparison of these simulation results are given as a PNG file as attached [Comparison of MPP Range.png]. Total difference between the grid feed-in values is only 38.1kWh that seems too low to me. There is no loss due to MPP voltage range in second simulation as expected. What surprises me is that losses due to the regulation on account of MPP voltage range is only 26,02kWh which corresponds to only 0,02% of all losses in first simulation. Isn't it too low? After this result I repeated the first simulation with hourly taken irradiance data and losses due to the regulation on account of MPP voltage range is found as 21,04kWh that is just 5kWh less than the result of simulation where we used minutely taken irradiance data as input. I believe there is something wrong (maybe I did not do something correctly) as irradiance data in minute steps is expected to seize the instantaneous voltage drops on PV modules due to momentary low irradiances. However simulation results show that the difference between minutely taken irradiance data and hourly taken irradiance data is just 5kWh on losses due to the MPP range at the end of a year which is just neglicible for a 100kW nominal DC power system. So am I doing something wrong? Maybe someone can give me a reasonable explanation here Thanks Oğuzhan