Analog MPPT controller circuit used in photovoltaic pumping systems

Analog Maximum Power Point Tracking (MPPT) controller circuit for photovoltaic (PV) solar system is an attractive solution due to its low cost and capability of easy integration with a normal DC/DC controller in several application like PV pumping system. This paper deals with this subject and presents an analog circuit that utilizes the coordinates of MPP to achieve maximum output power from the solar panel. The proposed controller can find the real MPP dynamically under different weather condition and its operation is depending on best choice of reference value such optimal voltage or current. The tracking performance of the proposed controller has been validated by experimental results using a test bench composed by 500 W PV panels connected to induction motor-centrifugal pump through DC/DC boost converter, three phases DC/AC converter and DSP card used as interface for command of DC/AC inverter and results registration.