Here is a report on Solor PV models in PSCAD.PSCAD Modules Representing PV Generator
E. Muljadi, M. Singh, and V. Gevorgian
National Renewable Energy Laboratory
This report described the development of a PV inverter model using PSCAD. We started with the fundamentals of the PV model at the solar cell by describing the I-V characteristic, the derivation of the equation, and the dependency of the output on the solar irradiance and the temperature. The equation for the solar array considered the fact that different PV inverters have different input (voltage, current, power ratings) specifications. Two types of MPPTs were implemented and simulated, and another MPPT was described.
The development of the PV inverter was covered in detail, including the control diagrams. Both the CR-VSI and CR-CSI were developed in PSCAD. Various operations of the PV inverters were simulated under normal and abnormal conditions. Symmetrical and unsymmetrical faults were simulated, presented, and discussed. Both the three-phase analysis and the symmetrical component analysis were included to clarify the understanding of unsymmetrical faults. This understanding about unsymmetrical fault operation is important because many PV inverters are connected to the distribution network, and most of the faults that occur are unsymmetrical faults, especially SLGs.
The dynamic model validation was based on the testing data provided by SCE. Testing was conducted at SCE with the focus on the grid interface behavior of the PV inverter under different faults and disturbances. The dynamic model validation covers both the symmetrical and unsymmetrical faults.
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