A more accurate analog voltage-based photovoltaic maximum power point tracking technique
In this paper, an analog voltage based maximum power point tracking (MPPT) algorithm for individual photovoltaic (PV) panel is proposed. The fixed voltage reference method is the simplest method for tracking, but it does not give good MPPT efficiency because the MPP voltage point changes at different solar insolation levels. A roughly linear slope is formed when connecting the MPP points measured from the highest isolation level to the lowest. Utilizing this characteristic, a bipolar junction transistor BJT is used to implement a variable voltage reference that improves the accuracy of the maximum power point voltage when the insolation changes. The proposed circuit is simple and easy to implement and it can easily track the maximum power point without the need of a digital controller or PID controller, so the cost and circuit complexity is reduced.
I. Introduction
In recent years, using renewable energy such as wind, solar and fuel cell to generate electricity has been growing dramatically. Harvesting the maximum power form the photovoltaic (PV) module is carried out by inserting a power converter between the PV module and the load. This power converter operates at a different duty cycle (D) in order to match the output and input impedance[I]. For the PV module, it is necessary that the operation point of the power converter is set at the maximum power point (MPP) to harvest the maximum power for the (PV) Module [2]
This entry is adapted from: https://ieeexplore.ieee.org/document/7926057
