Robin Vincent Posted July 31 Posted July 31 Optimizers Release note : Optimizer efficiency is now applied after module related losses The operating point at the optimizers input was previously computed before some losses that were purely module related. With this correction, all the usual array losses (except for the ohmic losses) are now applied before the optimizer. It may slightly change the input voltage, current and power, leading to a different optimizer efficiency and/or clipping losses. It will also be visible on the loss diagram, with the optimizer related losses now applied just before the ohmic losses. Release note : Optimizer: Power clipping is now better handled. When the optimizer(s) operating point at MPP is outside its nominal current or power, it must be shifted along the input IV curve. Before PVsyst 8.0.15, this shift was simplistic. For an overpower situation, the new power was set to nominal optimizer power, the voltage stayed the same and the current was reduced accordingly. A similar method was used for an overcurrent situation. For small overpower or overcurrent, the operating point shift is small enough that most collateral effect can be neglected. But for larger values, it may lead to unrealistic operating points at module and inverter level. The new algorithm is now similar to what is done with inverters. When clipping occurs, a new module operating point is selected on the IV curve, and the subsequent losses are recomputed. The consequences for most systems should remain small, but it will impact most projects using optimizers. Release note : Optimizers, SolarEdge: it is now possible to define subarrays with heterogeneous strings. When designing a subarray with SolarEdge optimizers, it is possible to have a string of optimizers in which all but one of them are connected to 2 modules. This so-called "heterogeneous string" is now possible to model in PVsyst. In a subarray with SolarEdge optimizers, if there are exactly two modules in series at the optimizer input, a checkbox will appear: When checked, the last optimizer of the string will be set with only one module, while all the other ones will have 2. In this example, one can see that there are 6 optimizers in series, for a total of 11 modules per string. Storage Release note : Grid storage: revision of battery operation calculations The battery control strategy has been reworked, leading to a more accurate implementation of the deratings at low and high SOC. This update may impact projects using a battery that often reaches its min or maximal SOC. Shadings Release note : 3D scene: small width changes in PV table dimensions (<3cm) now modify the total sensitive width/height The PV table dimensions (PV module + inter-module spacing + inactive band) were saved individually in the 3D scene, however small changes in the different components (below 3cm) did not trigger the computation of the total combined width or length. When opening old projects affected by this bug, the total "sensitive" width/length of PV tables will be recomputed. This can have a small impact on the shading computation. Release note : Trackers, diffuse shadings: "central tracker" and "custom tracker" modes now offer the choice of including shading objects in the calculation For trackers, diffuse shadings can be sped up by computing shadings only on a single (representative) tracker. The options "central tracker" and "custom tracker", which implement this choice, can be selected in the 3D scene > Tools > Trackers diffuse shadings definition window. In these two cases, shading masks (i.e., objects that cast shadows on the representative tracker) are selected by PVsyst. Up to version 8.0.14, only neighbouring trackers with the same orientation could act as shading masks. From version 8.0.15, by default, shading objects in the scene are also used as shading masks. A checkbox permits the exclusion of shading objects, effectively reverting to how 8.0.14 functioned. This choice is written in the simulation report. More information on this feature will be available on the help page https://www.pvsyst.com/help/project-design/shadings/calculation-and-model/diffuse-losses-with-tracking-systems.html
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