MATLAB Simulink Dynamic Photovoltaic Model Interface Development

Photovoltaic systems are generally modeled with a single diode circuit model. However, the single diode circuit model cannot give correct results under dynamic operating conditions due to the capacitance element in the photovoltaic cell and dynamic effects such as connection cables that may cause inductive effects. In literature, for dynamic operating conditions, single diode models including dynamic effects developed by modeling the system with circuit equations or by modeling the system with circuit elements found in readymade programs such as MATLAB. Models established with circuit equations often fail to integrate successfully with readymade circuit elements, such as resistance, capacitance, and diodes, found in simulation programs like MATLAB. Using only circuit equations in modeling does not allow us to benefit from the functions of a powerful modeling program, such as MATLAB. In this study, both readymade circuit elements and a newly developed photovoltaic cell model are used and simulated together as a whole by solving the circuit equations simultaneously. The parasitic junction and diffusion capacitance elements in the cell were modeled using the variable capacitance element in the MATLAB Simulink environment and simulated with the help of physical solvers. The instantaneous capacitance values of the capacitance element were determined by solving the model equations and given as input to the variable capacitance element. Thus, both the system can be analyzed dynamically with all its aspects using the model equations and ease of use is provided with the available circuit interfaces.