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Photovoltaic Power Profile Emulation Software

Photovoltaic Power Profile Emulation Software.pdf

Introduction
The Photovoltaic Power Profile Emulation (PPPE) software automatically calculates solar array voltage and current profiles based on user-defined parameters. These profiles can be sequentially sent to a Magna-Power Electronics power supply, which will emulate defined characteristics. The user can define a limitless number of profiles to be emulated and sequenced over a given time period.
Design and production validation for photovoltaic connected electronics requires a photovoltaic emulating power source with flexible output characteristics. Inverters and specialized DC-DC converters employ maximum power point tracking (MPPT) control algorithms to maximize utilization of nonlinear energy sources, such as solar panels and wind turbines. For development and manufacturing, using photovoltaic arrays for validation is costly with uncontrolled source characteristics. By utilizing a power supply with user-programmable output characteristics, the user can evaluate the full range of power conditions.
 
After the profile is defined, it can be transferred to the power supply for either static or dynamic emulation. A time dependent parameter defines how long the power supply should emulate that profile before loading the next profile in the sequence.
 
Modeling and Operation
A profile is a voltage/current curve that the power supply’s output should emulate. There are three methods to generate a power profile in the PPPE software:
 
Automatic, based on solar array parameters
The user selects the desired solar panel technology, nominal temperture, irradiance, voltage and current values. Each V-I profile is then defined only by new temperature and irradiance values. The rest of the parameters: maximum power point (Vmp, Imp), open circuit voltage (Voc), and short circuit current (Isc); are all calculated automatically in accordance with the EN50530 standard.
 
Automatic, based on 4-parameters
The user defines the maximum power point (Vmp, Imp), open circuit voltage (Voc), and short circuit current (Isc). The profile is then generated based on these parameters.
Manual
The user defines up to 50 current and voltage points for the power supply to emulate. The power supply performs a piecewise linear approximation between points to provide a smooth output curve.


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