Cooperative Converters in Power Electronic Systems

ABSTRACT: The specifications of power electronic systems are becoming ever more exigent -better performance (dynamic and steady state), increased efficiency, reliability, and quality, and decreased power rating, size (volume and weight), and cost. One strategy for the overall improvement of these systems is to use various cooperating converters with the system functions being shared among them, optimizing each converter for the functions assigned it. The result will be a converter with better characteristics than a conventional design based on a single converter (or on a simple parallel association of converters) responsible for all the functions assigned to the system. This paper analyzes the possibilities of such cooperative converters, considering the filtering inductor size, and the efficiency, reliability, and power rating

Hybrid FEA-Simulink Modelling of Permanent Magnet Assisted Synchronous Reluctance Motor with Unbalanced Magnet Flux

Nowadays, the research and industry societies showing their interest on permanent magnet assisted synchronous reluctance motors. One of the main disadvantages of using permanent magnets in electrical machines is a risk of demagnetization. This paper discusses a hybrid FEA-Simulink model with damaged permanent magnets in rotor flux barriers. Three sets of interpolation tables were computed using two-dimensional finite element analysis, calculated flux linkages and electromagnetic torque were used for development of Simulink model. Proposed model gives more accurate results in comparing to analytical one. The model opens the possibility of studying the machine under more realistic situations.Peer reviewe

Comparison of Impedance-Source Networks for Two and Multilevel Buck-Boost Inverter Applications

© 2016 IEEE. Impedance-source networks are an increasingly popular solution in power converter applications, especially in single-stage buck-boost power conversion to avoid additional front-end dc-dc power converters. In the survey papers published, no analytical comparisons of different topologies have been described, which makes it difficult to choose the best option. Thus, the aim of this paper is to present a comprehensive analytical comparison of the impedance-source-based buck-boost inverters in terms of passive component count and semiconductor stress. Based on the waveform of the input current, i.e., with or without a transformer, and with or without inductor coupling, the impedance-source converters are classified. The main criterion in our comprehensive comparison is the energy stored in the passive elements, which is considered both under constant and predefined high frequency current ripple in the inductors and the voltage ripple across the capacitors. Two-level and multilevel solutions are described. The conclusions provide a 'one-stop' information source and a selection guide of impedance-source-based buck-boost inverters for different applications