A three-phase to single-phase matrix converter for high-frequency induction heating

The paper describes a new three-phase to single-phase matrix converter featuring unity input power factor, very low input total harmonic distortion, and soft-switching over the full power range, for high frequency induction heating applications. A variable output pulse density modulation scheme has been proposed for stable operation of the converter, with the notable feature of requiring no on-line calculations for the synthesis of three-phase input current system. Practical issues in realising the converter, viz. line frequency synchronisation and output current circulation, are described. Good agreement between simulation and experimental results confirm the benefits of the proposed converter

Fuzzy Controller for Matrix Converter System to Improve its Quality of Output

In this paper, Fuzzy Logic controller is developed for ac/ac Matrix Converter. Furthermore, Total Harmonic Distortion is reduced significantly. Space Vector Algorithm is a method to improve power quality of the converter output. But its quality is limited to 86.7%.We are introduced a Cross coupled DQ axis controller to improve power quality. The Matrix Converter is an attractive topology for High voltage transformation ratio. A Matlab / Simulink simulation analysis of the Matrix Converter system is provided. The design and implementation of fuzzy controlled Matrix Converter is described. This AC-AC system is proposed as an effective replacement for the conventional AC-DC-AC system which employs a two-step power conversion.Comment: 11 page

Comparison of single-phase matrix converter and H-bridge converter for radio frequency induction heating

This paper compares the newly developed single-phase matrix converter and the more conventional H- bridge converter for radio frequency induction heating. Both the converters exhibit unity power factor, very low total harmonic distortion at the utility supply interface, good controllability under soft switching condition for a wide range of power, and high efficiencies, whilst still having simple structures. A novel switching control pattern has been proposed for the matrix converter in order to maintain the comparable performance to the H-bridge converter. Simulation and experimental results for both converters are presented. Comparisons between two converters have confirmed the excellent performance of the proposed matrix converter

Multilevel Multiphase Feedforward Space-Vector Modulation Technique

Multiphase converters have been applied to an increasing number of industrial applications in recent years. On the other hand, multilevel converters have become a mature technology mainly in medium- and high-power applications. One of the problems of multilevel converters is the dc voltage unbalance of the dc bus. Depending on the loading conditions and the number of levels of the converter, oscillations appear in the dc voltages of the dc link. This paper presents a feedforward modulation technique for multilevel multiphase converters that reduces the distortion under balanced or unbalanced dc conditions. The proposed modulation method can be applied to any multilevel-converter topology with any number of levels and phases. Experimental results are shown in order to validate the proposed feedforward modulation technique.Ministerio de Ciencia e Innovación DPI2009-07004Ministerio de Eduación y Ciencia TEC2007-6187

Vectorial formalism for analysis and design of polyphase synchronous machines

A vectorial formalism for analysis and design of polyphase synchronous machines without reluctance and saturation effects is described. We prove the equivalence of such a machine with a set of magnetically independent machines, which are electrically and mechanically coupled. Specific problems of polyphase machines can thus be favorably analyzed with this concept. Rules of conception and constraints on electric supply can be deduced. Moreover the vectorial approach, which generalizes the complex phasor method, can also be used to control n-leg Voltage Source Inverters. This methodology is applied to 3-phase and 6- phase synchronous machines

Indirect Modulation for Direct Matrix Converter

[ES] Los convertidores matriciales han sido estudiados y propuestos para diferentes aplicaciones.  Hay dos tipos de convertidores matriciales: los llamados indirectos y los directos, cada uno con sus ventajas y desventajas. Para el convertidor matricial indirecto se utilizan dos moduladores ya que está compuesto de dos etapas claramente definidas: un rectificador y un convertidor cd/ca; esto permite el uso de técnicas de modulación y control tradicionales. Por el contrario, el convertidor matricial directo se compone de una sola etapa, por lo que se considera un solo modulador o controlador; es decir que se usa un modulador directo.En este artículo se propone un modulador indirecto, pero para el convertidor matricial directo; esto es, se utilizan dos moduladores virtuales: un modulador para una etapa de entrada o rectificadora y otro para la etapa de salida o inversora; ciertamente ambos moduladores son unidos de forma que se generan las señales de control para el convertidor matricial de una sola etapa. Se presenta el análisis, operación y discusión de la propuesta, pero también resultados de simulación y experimentales que confirman la operación del sistema.[EN] Matrix converters have been studied and proposed for different applications. There are two types of matrix converters, the called indirect and direct converters, each one with their advantages and drawbacks. For the indirect matrix converter are considered two modulators since is composed by two stages: one for the rectifier stage and the other for the inverter stage, then a traditional controller should be employed; on the contrary the direct matrix converter is composed for just one stage, and then is considered a single modulator or controller, this is, a direct modulator is usually employed. In this paper an indirect modulation is addressed, but for the direct matrix converter; this is, two virtual modulators are employed; one modulator is for the input and the second for the output, but certainly both are joined to establish the final control signals of the single stage matrix converter. 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Drive systems for operation on deep-sea ROVs

Power systems for thruster actuators and other auxiliaries employed on work-class deep-sea ROVs subject to 300bar ambient pressures, are considered. Emphasis on 3×3 matrix converters for thrusters and 3×2 matrix converters for system auxiliaries, is given, along with experimental results showing operation during pressure cycling consistent with typical operational duties