Digital Current-Control Schemes

The paper is about comparing the performance of digital signal processor-based current controllers for three-phase active power filters. The wide use of nonlinear loads, such as front-end rectifiers connected to the power distribution systems for dc supply or inverter-based applications, causes significant power quality degradation in power distribution networks in terms of current/voltage harmonics, power factor, and resonance problems. Passive LC filters (together with capacitor banks for reactive power compensation) are simple, low-cost, and high-efficiency solution

Direct torque control for dual three-phase induction motor drives

A direct torque control (DTC) strategy for dual three-phase induction motor drives is discussed in this paper. The induction machine has two sets of stator three-phase windings spatially shifted by 30 electrical degrees. The DTC strategy is based on a predictive algorithm and is implemented in a synchronous reference frame aligned with the machine stator flux vector. The advantages of the discussed control strategy are constant inverter switching frequency, good transient and steady-state performance, and low distortion of machine currents with respect to direct self-control (DSC) and other DTC schemes with variable switching frequency. Experimental results are presented for a 10-kW DTC dual three-phase induction motor drive prototype

A direct-drive solution for Hydrogen supplied all-electric airplane

This paper present a solution for traction motor in ultra light motored (ULM) aircraft applications. A new All electric aircraft is here presented with a hydrogen supplied fuel-cell system and a direct-drive configuration for traction motor. A reverse brushless solution with a distributed winding high pole-pair motor is presented for a 60 kW continuous power solution. Materials and geometry have been analyzed with a goal of high torque density and high speed realization. Motor design key points and losses estimation in comparison with the experimental results will be presented

Simulation of Processes in Synchronized Cascaded Inverters for Photovoltaic Application

The paper presents results of investigation of dual-inverter-based power conversion system with synchronized pulsewidth modulation (PWM) for photovoltaic application. This system topology includes two isolated strings of photovoltaic panels, feeding two standard three-phase inverters, connected to grid by a three-phase transformer with the open winding configuration on primary side. Algorithms of synchronized PWM provide continuous voltage synchronization both in each inverter and in the load in this case. MATLAB-simulations show the behavior of dual-inverter system with continuous, two discontinuous and combined schemes of synchronized PW