ECONOMICAL MPPT METHOD FOR PHOTOVOLTAIC SYSTEM WITH CHANGING OPERATING CONDITIONS

The power of photovoltaic cells (PV) varies with illumination, temperature and radiation. The paper introduces a new matching method and a simple economical implementation for the DC-DC conversion applied atPV terminals. The method uses a "boost" configuration controlled only by trigger, flip-flop and analog circuits. It results minimal complexity and component number. An event detection method, changes the sense of the reference current variation only when the power derivative becomes negative. A repetitive initializing procedure eliminates the effect of changing environmental conditions. Simulation results are obtained for step variation ofthePVdevice characteristics.