José Artur Alves Dias

Application of single-phase to three-phase converter motor drive systems with IGBT dual module losses reduction

This paper aims to apply a universal filter configuration to supply a three-phase motor from the single-phase grid, in this case the motor must be supplied with the same frequency of grid. The initial hypothesis consider that is possible to minimize the converters losses through the variation of motor voltage phase and through selection of an appropriate transformer. To reduce the IGBT dual module losses means to reduce the operational cost of the system. The initial investment of this configuration is very attractive for treating of a converter that works in shunt, in other words, only a part of the load power flows through the converter. Analysis in steady state has been realized, as well. Experimental results are showed to demonstrate the theoretical studied.

Single-Phase to Three-Phase Universal Active Power Filter

In this paper, a universal active power filter is proposed for harmonic and reactive power compensation in the single-phase to three-phase systems. The proposed configuration solves a typical problem found in remote (or rural) applications, where only a single-phase grid is available and there is a demand to supply three-phase loads. A suitable control strategy is presented to regulate the load voltage, the power factor, and to minimize the voltage and current harmonics simultaneously. Simulated and experimental results are also presented.

Active power line conditioner applied to single-phase to three-phase systems

In this paper, an active power line conditioner is conceived for harmonic and reactive power compensation in the single-phase to three-phase systems. The proposed system is divided into two classes: a) parallel active power filter at the single-phase grid side; and b) series active power filter at the three-phase load side. Compared with conventional five-leg single-phase to three-phase converter, the proposed system presents some advantages, like lower dc-link voltages and lower currents of the legs. A suitable control strategy is presented to regulate the load voltages, power factor of the grid close to one, and to minimize the voltage and current harmonics simultaneously. Simulated and experimental results are also presented.

Single-Phase to Three-Phase Converters With Two Parallel Single-Phase Rectifiers and Reduced Switch Count

This paper presents two single-phase to three-phase conversion systems for a three-phase load application. The load is connected to a single-phase grid through an ac-dc-ac single-phase to three-phase converter. The single-phase rectifier is composed of two parallel single-phase half-bridge rectifiers. The first proposed topology is composed of a full-bridge three-phase inverter, i.e., three-leg inverter, while the other topology is composed of a two-leg inverter. Suitable modeling, including the circulation current, and control strategy are presented. A pulsewidth modulation (PWM) technique using a single or double carriers PWM implementation is presented. Proposed topologies permit to improve the harmonic distortion. In addition, the P5L converter can reduce the converter power losses. Finally, simulation and experimental results are presented for validation purposes.

A low investment single-phase to three-phase converter operating with reduced losses

This article proposes an active filter configuration used for single-phase to three-phase conversion. The proposed system permits to minimize IGBT dual modules losses and consequently minimizing the cost of the system. Such cost reduction is due to the operation of proposed system in shunt way, thus only part of power follows through the converter. The input and output voltages of the converter operate synchronized, and the synchronization angle between single-phase and three-phase systems is the control variable used to minimize systems losses. A transformer is used to operate as series active filter. Despite the additional cost associated with transformer, this configuration presents only four arms, the investment can be lower than the direct solution with five arms. Steady state analysis, simulated and experimental results are presented as well.

Low cost single-phase grid-tie generator

This paper proposes a low cost single-phase generator system. This system consists of a three-phase squirrel cage induction machine used as single-phase generator with a Steinmetz connection. A VSI (Voltage Source Inverter) with three legs is used to feed the generator and a controlled rectifier unit, which injects generated energy to single-phase system. The three-phase squirrel cage induction machine is cheaper than other machines for the same power range, and low maintenance cost. The converter VSI with three legs is available in compact modules with integrated gate-driver with reduced price. Analysis, dynamic simulation and experimental results are presented for the proposed system.

AC drive fault tolerant system with single-phase grid

The goal of this paper is to propose a fault tolerant system for a single-phase to three-phase ac drive system. Open circuit and short circuit failures are considered in this work as non-programmed maintenance troubles occurring in the converter power devices, and it can be compensated by proposed strategy. The fault compensation is achieved by reconfiguring the power converter topology with the help of isolation and connection devices. These devices are used to redefine the post-fault ac drive system topology. The post-fault converter topology associated to the control strategy allows to keep the ac drive system operating with dc-link voltage equal or close to that of the pre-fault system. Experimental results demonstrate the validity of the proposed system.

Sliding Mode Control applied on a three-level single-phase T-converter rectifier

This work proposes the modelling and simulation of a single-phase AC/DC half-bridge T-type converter by using a Sliding Mode Control algorithm, which is little sensitive to disturbances and displays fast dynamic behavior. The control ensures unity power factor, sinusoidal input currents, regulated DC output voltage, and a three level converter grid voltage. This paper also compares the proposed solution with a conventional control algorithm with PWM.