INT MOD SIM
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Simulation Interface Features:
To simulate a photovoltaic curve some reference parameters are required. These parameters are often specified by manufacturers of photovoltaic panels. The parameters required for the simulation interface should be values under stc. stc specifies a temperature of 25°C and an irradiance of 1,000 w/m2 with an air mass 1.5 (am 1.5) spectrum - see image and table below:
To simulate a photovoltaic curve based on the reference parameters describe above, some panel parameters are required. These parameters are specificed below:
Dynamic Efficiency Test
The simulation module can run a dynamic MPPT eficiency test as described in the EN50530 annex. To run this test extra parameters are required. These parameters are specified in the table just below.
The dynamic efficiency test uses the same configuration parameters as described earlier but varies the irradiation levels of these parameters as specified below.
The simulation interface also supports a table mode. With this table mode it is possible to simulate a custom curve. Or simulate a photovoltaic curve existing of multiple panels in series where some panels are shaded. In table mode the simulation module uses a table of 128 data points to program the current of the power supply.
It is possible to calculate a partially shaded photocoltaic curve with the desktop application. The resulting table can be exported to a .csv file.
Custom of calculated tables are programmable via the desktop application.
All the parameters required for photovoltaic simulation can be configured by using the desktop application which is supplied on CD with the simulation module.
In the photovoltaic simulation the parameters for the photovoltaic simulation can be configured. The application also renders the photovoltaic curve calculated with the entered values. The application reads the voltage and current measurements of the power supply and displays these in the graph as shown below.
The simulation interface can simulate a custom curve based on a table. A seperate application is available specifically for this mode.
With this application it is possible to manage, load and write tables from and to the simulation interface. The application can read .csv files.
Internal Resistance Simulation
The simulation interface can automatically compensate for voltage drops over the leads without using sense leads. This simulation type has three different modes:
All these operating modes are limited by the maximum configurable resistance as specified.
The settings for the leadless sensing simulation can be configured through the web interface
The leadless sensing simulation is a correction on any other programming source. For example you can set the voltage and current with the front knobs, set a leadless sensing resistance value through the web interface, and the simulation interface automatically corrects the output voltage.
Foldback Current Simulation
The simulation interface can simulate foldback current limiting behaviour to provide a higher level of protection for DUT's. On foldback current limiting the power supply will fold back, after being a specified time in constant current mode, to a predefined current setting. The image to the right shows an example of this current behaviour.
The foldback current simulation can also be used to simulate a foldforward current limit.