Abstract
The paper describes a simulation model of a simple photovoltaic system intended as a tool for testing the use of finite state machines for simulations representing a long-term operation of renewable energy sources. The mathematical model of the photovoltaic system is described first. Then it is used to build a finite state machine model that calculates a power output of the photovoltaic system for changing values of a solar irradiance and a temperature. Data measured on a real photovoltaic installation are used to verify model’s accuracy through its comparison with a previously created and verified Matlab model. The finite state machine model presented in this paper was created using Ptolemy II software.
Highlights
The model of PV system consists of mathematical models of a PV array, a DC boost converter loaded by constant resistive load and a maximum power point tracking (MPPT) controller (Fig. 1)
The development of semiconductor technology in the fifties of the last century, P-N junction preparation and knowledge of physical processes in the PN junction created the conditions for the production of solar cells with a reasonable efficiency
The switching of the DC boost converter is controlled by MPPT controller, which changes the duty cycle D of the converter according to the voltage from PV array and load current
Summary
The model of PV system consists of mathematical models of a PV array, a DC boost converter loaded by constant resistive load and a maximum power point tracking (MPPT) controller (Fig. 1). The inputs of the PV array model are solar irradiance λ (kW·s−2), temperature T (K) and load current I(A). They are used to calculate the PV array voltage V that is used as an input for the model of DC boost converter. The switching of the DC boost converter is controlled by MPPT controller, which changes the duty cycle D of the converter according to the voltage from PV array and load current. The MPPT controller’s algorithm determines the duty cycle needed to operate the PV array in a point of its maximum power
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