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Fresh Questions, Practical Answers: PVsyst Q&A Series #7

Friendly Tip: The software version used in the following Q&A section is PVsyst 6.66 or 6.67. For other versions, please refer to them for reference. 1. Can PVsyst output the sunlight and temperature data for every hour of the entire year? [Teacher Yang]: On the initial interface of the grid-connected system design, settings are made in the "output file" section within "Advanced simul.". By default, the software does not output any files after simulation, meaning the "Datafile output" option is set to "No output" (i.e., no files are output). However, we can choose "Output on filename" and set the path for saving the file (default or User-defined). After the simulation is completed, a file for each hour will be automatically generated, which can be opened using Excel. Since the file is generally in Csv format, with spaces or semicolons as separators, the columnar data can be presented using Excel's columnar splitting function.…

Fresh Questions, Practical Answers: PVsyst Q&A Series #6

The PVsyst version used for the following Q&A is 6.66 or 6.67, and other versions can be referenced for guidance 1. When the installed capacity of photovoltaic (PV) systems exceeds 1MW, clicking the Layout button for PV module arrangement will result in the pop-up alert box shown in Figure 1. How can this be resolved? ▲Figure 1 [Answer from Teacher Chen]: The hidden parameter settings interface of the PVsyst software imposes certain restrictions on the photovoltaic installed capacity to be simulated. As shown in Figure 2, open the main interface of PVsyst software, click on the menu bar "Preferences" → "Edit hidden parameters", and select the category (Category) shown in Figure 2. It can be observed that when the photovoltaic installed capacity exceeds 1MW, opening the "Layout" function will pop up a "Warring" (warning). If it exceeds 5MW, then the "Layout" function will be unusable. To solve this problem, the…

Fresh Questions, Practical Answers: PVsyst Q&A Series #4

The PVsyst version used for the following Q&A is version 6.66, and other versions can be referenced for guidance. 1. How to interpret the shadow animation trajectory on the PVsyst 3D simulation interface? How to simulate at a specific solar hour? [Teacher Chen's answer]: Currently, the simulation of 3D shadow animation in PVsyst versions 6.66 or 6.67 differs from previous versions, as there is no option to simulate according to "Solar time" or "Legal time". In the current version, the default setting is to simulate according to "Legal Time", which, in China, corresponds to Beijing time. As shown in Figure 1, a rectangular obstacle is placed about 1 meter away from the center of the front row of photovoltaic arrays. According to previous versions, if simulated according to solar time, the shadow curve would be symmetrical. However, it is not symmetrical under solar time. ▲Figure 1 According to the "Photovoltaic…

Fresh Questions, Practical Answers: PVsyst Q&A Series #3

1. There is a discrepancy between the photovoltaic plane radiation amount in the Report and the photovoltaic plane radiation amount in the Orientation. Why? [Answer from Teacher Chen]: As shown in Figure 1, the project site is in Hangzhou, and the source of meteorological data is Meteonorm7.1 software. The tilt angle for photovoltaic installation is 25°. In the Oritentation optimal tilt angle selection interface, the software itself only enables users to adjust the tilt and azimuth angles, facilitating a quick judgment of the optimal tilt and azimuth angles. However, the specific radiation values are approximate. As shown in Figure 3, the annual radiation amount is 1263kWh/m2. The radiation value obtained after simulation as shown in Figure 4 is an accurate value. As shown in the fourth column of Figure 4, the annual radiation amount is 1256.6kWh/m2, so this value should be used as the standard. ▲Figure 1 ▲Figure 2 2.…

Fresh Questions, Practical Answers: PVsyst Q&A Series #2

1. Question: Can PVsyst export hourly photovoltaic output? [Answer from Teacher Chen]: Yes, you can. Open the PVsyst simulation interface and click the "Output File" button, which is "Export file", as shown in Figure 1. ▲Figure 1 After opening, the interface shown in Figure 2 appears. By default, PVsyst does not output any files after simulation, but we can choose to output files and set the relevant formats of the output files, such as date and time format, separator symbol for numerical values, and whether the time span of numerical values is displayed in hours, months, or days. There is a blank option box on the right side, where you can select the corresponding variables according to your needs. The variables from top to bottom in Figure 2 are the total radiation amount of the photovoltaic plane, the maximum power output of the DC-side photovoltaic arrays, and the mismatch loss…

Fresh Questions, Practical Answers: PVsyst Q&A Series #1

1. Question: After solar tracking, the curve of the PV Rack Model does not take 12 noon as the symmetry point. What is the reason? ▲Figure 1 As shown in the figure above, the tracking curve is traced with 1 pm as the symmetry point. This issue did not occur in previous versions before the update. [Answer from Teacher Chen]: The situation shown in Figure 1 occurs because the dynamic shadow simulation in the 3D modeling interface does not use Solar Time. PVsyst defaults to Legal Time. If Solar Time is used, as in the photovoltaic array shown in Figure 2, the shadow results will be symmetrical. However, it should be noted that if there are other obstacles near the photovoltaic array, the shadow results will generally not be symmetrical at 12 noon, regardless of whether the simulation is done using Solar Time or Legal Time. ▲Figure 2 2. Question:…

The array layout has been enhanced with 7 new functions

Array layout is a crucial aspect of photovoltaic projects in mountainous regions. In the latest version of our software, we have enhanced the array layout function by introducing multiple configurable parameters, allowing users to more scientifically arrange arrays based on actual construction conditions. 1. Maximum foundation slope This function is primarily used to prevent the array (partially) from being arranged in areas with drastic terrain changes or excessive slope along the long side of the array. When the array is placed in a certain location, if the absolute value of its base slope exceeds the preset threshold, the software will automatically perform left/right stepping operations until the base slope drops below the preset threshold. 2. Alignment angle This function is primarily utilized in the design of photovoltaic projects for fish ponds or canals. It allows for specifying a particular edge, drawing an edge, or manually inputting an angle as the alignment…

Is the production slightly higher when arranged following the slope compared to the normal arrangement?

The author received a consultation: for a project in Guangxi, the yield (referring to the yield per kilowatt, the same below) of electricity generated by following the slope is surprisingly slightly higher than that when arranged directly facing south. After conducting Production calculations for two layout plans using Candela3D and PVsyst software, the Simulate results have verified the correctness of the conclusions. What exactly is the reason for that? The author has conducted an analysis on the actual terrain layout of the project, and the results are as follows: In the table above, the four normals highlighted in red account for nearly 70% of the total. Next, we will calculate the actual tilt and azimuth angles of the array for these four normals, using both due south and downslope arrangements, and employ PVsyst to compute the annual total radiation. It can be observed that for the aforementioned four orientations, when…

From 1 to N, modular design of large-scale base projects

When implementing large-scale flat-land large-scale base projects, one can first design a standard power block, and then replicate and modify it to form the final design layout.In this way, the efficiency of the design can be greatly improved. 1. Standard power block, complete busbar, routing, and Cable laying 2. Array copy power block 3. Fill the edge arrays 4. Auto create power blocks for the edge array Through the aforementioned four steps, the layout, division of power blocks, busbar connection, and cable laying (some of which require manual adjustment) for GW-scale base projects can be quickly completed.

The new generation of arrays layout module for complex terrain projects has been launched

The previous issue of "Hill-shading analysis method for complex terrain" addressed the issue of selecting sunshine regions in complex terrains. However, how to arrange arrays as much as possible within a limited area while ensuring maximum production is a highly complex problem. We cannot simply consider this issue in terms of the front row not blocking the back row during a certain period of time (although this is a conventional approach, the result is insufficient land utilization and the plan is not economical). We need to consider many issues, such as: 1) Partial arrays are allowed to be obscured, allowing for a more compact array layout; 2) If some scattered arrays block the back row, even if they are not obscured by the front row, deleting them can make the arrangement of the back row more tidy; 3) Mutual obstruction and sequence of layout between adjacent areas (such as front…

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