Single-phase Buck-boost Inverter Research Articles

Transformerless Single-Phase Buck–Boost Inverter Decoupled From the Midpoint of the Input DC Capacitors

Transformerless Single-Phase Buck–Boost Inverter Decoupled From the Midpoint of the Input DC Capacitors

Optimal Tuning of Resonant- and Repetitive-Based Controller for Single-Phase Buck–Boost Inverter With Unfolding Circuit

A Buck–boost inverter with unfolding circuit in a grid-connected mode has numerous advantages but suffers from nonlinear nature and zero-crossing spike, which are difficult to eliminate; it, therefore, requires an accurate control approach. This article presents an optimal tuning approach of the digital control system based on a proportional resonant and repetitive controller along with proper pulsewidth modulation block. Optimal performance consists in the minimal steady-state error and fast transient response keeping the system in the stable domain in a wide range of operation. It is achieved by a derived set of coefficients of the controller for different operation points. To tune the system, an appropriate transfer function of the plant is developed in the z-domain, taking into account nonlinearity of the system and digital delay. In advance, we present a detailed study of various discretization methods for best coincidence with the simulation and experimental results. Simulation and experimental results confirmed theoretical statements. The proposed approach allows double improvement of the total harmonic distortion of the grid current in most of the operating points.

A Comparison between Buck-Boost Inverter with and without Buffer Inductor

The electric vehicle inverter requires an induction motor drive with a high output of voltage and current to reduce the number of batteries used and in turn reduce the vehicle’s weight. In this paper compared two single Phase BuckBoost Inverter (SPBBI), that is between the SPBBI conventional topology with SPBBI new topology uses a buffer inductor. The results of comparison are expected that the new inverter topology can strengthen the voltage greater than the conventional inverter topology. The inverter’s components of capacitor and inductor were reconfigured. The circuit was simulated for various carrier and signal frequencies with various load. The simulation results of the proposed topology compared with the simulation results of conventional topologies commonly used in a variety of frequency and load values. It is shown that the output voltage and current can be strengthened significantly, with a value of more than five times of the output voltage compared to the conventional inverter. The new inverter topology is useful to be implemented for the electric vehicle.