Power Electronics for Photovolqatic Energy System of an Oceanographic Buoy
Behroozian, E., Tabesh, A.R., Bahreinian, F., Zamani Foroushani, A.R.
IEEE Applied Power Electronics Colloquium, April 2011
Abbstract :
This paper reports on design of power electronics for photo volatic (PV) energy system of an offshore remote sensing apparatus. Challenges in design of a PV energy system for a marine application are investigated and the design limitations compared to inland PV system are descussed. The designed system includes PV cells as the main source of energy , electric storage (battery) , maximum power point tracking (MPPT) and protection circuitries . An MPPT algorithm based on measuring the slope of the PV power-voltage curves is pressented which can be implemented with simple analog electronic circits . The MPPT circuit uses Spie converter as a core and it also includes a protection unit for maintaining the battery voltage in a safe range. The performance of the propossed MPPT algorithn in presence of measurement noises is verified using a circuit simulation software tool (PSCAD). Simulation results verify that the algorithm appropriately regulates the voltage of PV cells at MPPT and it is robust against measeurement noises for a signal - t - noise ratio - 2 db.