Falberto76 Posted October 2, 2022 Share Posted October 2, 2022 Hi, We have to simulate an old version of horizontal tracker, which has two horizontal axis, one axis oriented in N-S direction and whose rotation determinates the tracking along the E-W direction (+/-60°) , and another axis which optimize the tilt (range -15/+45) alond the daily sun movement. the two axis support frame of PV modules. We have been told by the backtracking algorithm company that the tracker performs backtracking on both the axis and we're trying to get from them the tracking astronomical map of the trackers. We have difficulties to find a reliable way to simulate the energy yield on PVSYST since the SW allows to consider backtracking only at 1 of the two axis. We have operating data too of existing plants with the same tracker and performed some simulation with PVSYST with backtracking only at 1 of the two axis in order to verify if the simulation roughly approximates the field behaviour. The complexity is given also by the fact that we should also simulate the same trackers with different PV modules, due to a revamping strategy which interests such trackers. Here the questions. 1) Assuming we're able to get hourly values of tracker position in both axis, is it possible to calculate GTI on such custom orientations and get back an excel file? 2)Assuming the above (or either finding another reliable tool which implements the Perez transposition on the tracking surface), an idea could be to obtain the annual GTI and then roughly calculationg the yield by using the Performance ratio calculated with PVSYST on the same system, but with only one tracker allowed to to do backtracking. This may imply calculation errors but anyway will approximate the energy behavior and - correct me if 'm wrong - the other losses from GTI surface collected energy to energy output at the meter should not be too different. Is this plausible or there are any ways to do the calculation? Another way could be to calculate the system as a single axis (ie considering the primary axis only, i.e the one which has the greater rotation along the day), let's say the N-S axis which turn the E-W rotation, and assume a constant tilt, or a limited tilt to be sure the tracker does not go in mutual shading, and calculate with this configuration the yield. Then the yield could be adjusted by calculating the GTI on the tracking plane which follows backtracking in both directions. Thank you for any hints or suggestion Link to comment Share on other sites More sharing options...
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