DSP implementation of a naturally commutated matrix converter open loop control

International audienceThis paper deals with the design concept of a naturally commutated matrix converter control system. Matrix converters provide an all-silicon solution to the problem of converting AC power from one frequency to another, offering almost all the features required of an ideal static frequency changer. Until few years ago, control of switch mode power supply systems used analog controllers. Digital signal processors (DSP) are emerging as the processors of choice in monitoring and control of power electronics systems. In recent years, with the progress of high speed, lower cost digital signal processing (DSP) there has been a blossoming of the use of DSP techniques especially in power converters control. Using the 16-bit fixed point TMS320LF2407 DSP of Texas Instrument, a control strategy is implemented and tested on a 3 KW variable speed constant frequency generating system (VSCF) by using a naturally commutated matrix converter (NCMC)

New control strategy for a naturally commutated matrix converter for variable speed constant frequency generating system

International audienceSeveral industrial applications require the production of an accurately regulated frequency power output, from a variable frequency power source; such as variable speed constant frequency generating systems (VSCF) for aircraft and mobile power supplies. A new control strategy based on the cosine wave crossing control is applied to a naturally commutated matrix converter in a VSCF generating system. A VSCF generating system is obtained by using a new and innovative topology composed by a six phases permanent magnet synchronous generator (PMSG) and a six to three phase naturally commutated matrix converter (NCMC). This kind of generator is used with the aim of avoiding mechanical gear-box and improves gas turbine efficiency. Matrix converters provide an all-silicon solution to the problem of converting AC power from one frequency to another, offering almost all the features required of an ideal static frequency changer. With the progress of high speed, lower cost digital signal processing (DSP), there has been a blossoming use of DSP techniques especially in power converters control. The proposed control strategy was successfully simulated and implemented on a fixed point TMS320LF2407 Texas Instruments device. Comparison of simulation results with experimental test results are given in this pape

Commande d'un convertisseur matriciel dans un système de production d'énergie électrique à vitesse variable et fréquence fixe

International audienceLes convertisseurs de puissance sont devenus des éléments incontournables dans les chaînes de production et de distribution de l'énergie électrique. Une simplification de taille est réalisée grâce aux entraînements électromécaniques directs qui permettent la suppression des organes de transmission mécanique. L'association turboalternateur - convertisseur statique est devenue une réalité industrielle qui permet aux organes d'entraînement (turbines) de fonctionner à leurs vitesses d'optimisation de rendement. Les convertisseurs statiques directs présentent une solution tout silicium au problème de conversion de fréquence. Ces convertisseurs, contrairement aux convertisseurs indirects, sont dépourvus d'éléments de stockage d'énergie électrique. Une topologie innovante de convertisseur statique AC/AC est présentée dans cet article. La commande du système complet présentée est implantée sur un système de commande en temps réel construit autour du DSP contrôleur TMS320LF2407. Les résultats de simulation et d'expérimentation sont présentés dans cet articl

Modelling and experimental analysis of a six phase permanent magnet synchronous generator in a variable speed constant frequency generating system

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A Novel Quasi-Z-Source Inverter Topology With Special Coupled Inductors For Input Current Ripples Cancellation

International audienceThis paper proposes an inductors coupling technique to cancel input current ripples of a quasi-Z-source inverter without adding any components. This means the suppression of input filters that are used to protect voltage sources. This cancellation property is made possible by a suitable coupling of the two existing quasi-Z-source inductors according to mathematical condition. The considered system in this paper is an electric drive system composed of a motor fed by the proposed coupled quasi-Z-source inverter. An experimental prototype to validate both the theoretical and simulation analyses has been developed. The results have validated the proposed coupling strategy and show that it does not degrade the global efficiency of the system. Index Terms—high-frequency ripples, quasi-Z-source inverter, coupled inductors, battery current, electric drive syste

Experimental control of matrix converter for active generator

International audienceThis paper presents the control design for a matrix converter, which interfaces a power generator to a passive charge. Matrix converters, which are direct power electronic converters, are able to provide important benefits such as bidirectional power flow and great potential for size reduction. On the other hand, the complexity of the matrix converter topology makes the study and the determination of suitable control strategies a difficult task. A matrix converter is used as an alternative concept to avoid the need for a gearbox upstream the generator in an electrical energy production process. This work also includes a real-time control of the matrix converter, control scheme and experimental results are presented to

A Control Strategy for Electric Traction Systems Using a PM-Motor Fed by a Bidirectional Z-Source Inverter.

International audienceThis paper deals with a control method that adapts the dc bus voltage of electric traction systems using permanent magnet synchronous machine (PMSM) fed by bidirectional Z-source inverter (ZSI) or other improved topologies. This control allows reducing both the overestimation of the dc bus voltage and losses in the inverter. The sliding-mode control (SMC) method is used to control the Z-source converter, whereas flatness-based control is proposed to drive the actuator and generate the peak dc bus voltage reference. Flatness-based control is chosen because the actuator transients are well mastered. Extra shoot-through zero inverter states are inserted by means of implemented algorithm on a space-vector-modulation (SVM) scheme. Different short-circuit strategies are studied and compared according to constraint criteria. Both simulation and experimental results are presented and discussed to validate the proposed voltage adaptation strategy and the improvement on global efficiency

Current Sensorless Control for WRSM Using Model-Free Adaptive Control

International audienceSensorless control theory is considered as one of the most important keys to reduce the cost of manufacturing and maintenance in automotive applications. This article presents a current sensorless control algorithm of a wound rotor synchronous machine using a model-free-adaptive control (MFAC). The only controlled variable in this method is the rotor speed, and no observation or estimation will be performed on the phase currents. The presented controller is also compared with a current sensorless control method that uses a Lyapunov-based observation of phase currents in the control algorithm. The developed control algorithm is first tested in simulation under several operating conditions, such as starting, tracking, parameter variation, and load step. Then, experimental tests validated the effective performance of MFAC in a current sensorless control algorithm. According to these results, the control of phase currents is guaranteed with a small error but without using any current sensors