Luenberger Observer Based Current Estimated Boost Converter for PV Maximum Power Extraction-A Current Sensorless Approach

A continuous change in the solar irradiance level and local atmospheric conditions, such as temperature and humidity, necessitate the use of maximum power point tracking (MPPT) technique of a photovoltaic (PV) system. MPPT ensures to harvest maximum power. Generally, voltage and current sensors are required to track the power of a PV system. The proposed method tracks the power of a PV system without the use of any current sensor. It not only reduces the cost of the system, but also reduces the communication burden, internal disturbances, and complexity. The proposed scheme estimates the current internally by using Luenberger observer technique. Thus, the estimated current is given to perturb and observe based MPPT technique, to generate the required duty for a dc-dc boost converter. The proposed scheme is experimentally investigated, and thus, obtained results are compared with well-established MPPT techniques. A comparison shows that the proposed system results are in a good agreement with the current sensor based MPPT technique.