A Complex-Valued Feedback Linearization-Based Controller for a Voltage Source Inverter Tied to the Grid via a Second-Order Filter

TL;DR

This paper introduces a complex-valued feedback linearization control method for a grid-tied voltage source inverter with a second-order filter, improving performance amid large disturbances and set-point changes.

Contribution

It presents a novel nonlinear control law based on complex-valued feedback linearization for a grid-connected inverter with a second-order filter, enhancing stability and response.

Findings

Successful simulation results on a weak grid demonstrate effective control.

The control strategy maintains stability during large set-point changes.

The method achieves satisfactory tracking performance in simulations.

Abstract

In this document, a nonlinear control law for a grid-tied converter is introduced. The converter topology consists of a voltage source inverter (VSI) linked to the grid through an inductive-capacitive second-order filter, its input being connected to a capacitive DC-link supplied by a renewable energy-based input power source. In order to achieve good performance in presence of large state excursions caused mainly by substantial set-point modifications and/or considerable disturbances, a nonlinear control law based on a complex-valued feedback linearization strategy is designed. Specifically, a flat output is adopted, which is given by the summation of the energy stored in the DC-link capacitor and in the output filter's inductor and capacitor, as well as by the reactive energy at the output. After linearizing the system through a pertinent coordinate transformation and a nonlinear feedback, a linear trajectory tracking control law is implemented. The performance of the system controlled by applying the proposed strategy is tested via simulation for a very weak grid of unity X/R ratio, yielding satisfactory results.