# Nonlinear Equivalent Resistance-based Maximum Power Point Tracking (MPPT)

## TL;DR

This paper introduces a nonlinear equivalent resistance tracking method for solar MPPT that uses feedback linearization to ensure stable and robust convergence in highly nonlinear dynamical systems.

## Contribution

It proposes a novel nonlinear model and control approach for MPPT that improves stability and robustness over traditional methods.

## Key findings

- Effective convergence to setpoint demonstrated in simulations
- Enhanced robustness across different operating regimes
- Stable performance in highly nonlinear system dynamics

## Abstract

We present a nonlinear equivalent resistance tracking method to optimize the power output for solar arrays. Tracking an equivalent resistance results in nonlinear voltage step sizes in the gradient descent search loop. We introduce a new model for the combined solar module along with a DC-DC converter which results in a highly nonlinear dynamical system due to the inherent non-linearity of the PV cell topology and the switched DC-DC converter system. To guarantee stability over a range of possible operating regimes, we utilize a feedback linearization control approach to exponentially converge to the setpoint. Simulations are presented to illustrate the performance and robustness of the proposed technique.