Marius Klytta

Matrix-Reactance Frequency Converter Based on Buck-Boost Topology

This paper deals with a three-phase direct matrix-reactance frequency converter (MRFC) with buck-boost topology and includes a description of its topology and operation plus presentation of the results of an investigation of its properties. Presented too is a conceptual development of the frequency converter based on a buck-boost matrix-reactance chopper (MRC) with source switches arranged as in a matrix converter (MC). The averaged state space method is used in the analysis. In the control circuit, a classical control strategy, attributable to Venturini, is used for the study of the presented conception. The simulation test results are also presented in order to verify the results of the theoretical analysis. Furthermore, simplified description of the experimental setup, which will be used in next investigations is also presented.

Modelling and analysis of a matrix-reactance frequency converter based on buck-boost topology by DQ0 transformation

This paper deals with a three-phase matrix-reactance frequency converter (MRFC). The analysed MRFC topology is based on buck-boost matrix-reactance chopper (MRC) one with source synchronous connected switches (LSCS) set arranged as in the step-up matrix converter (MC). The MRFC in question makes it possible to obtain a load output voltage much greater than the input voltage. Presented in this paper is a description a method for the analysis of the steady and transient state properties of presented MRFC. The static and dynamic characteristics of the presented converter under the control strategy proposed by Venturini are fully analysed on the basis of the circuit model development by the DQ0 transformation. Various static converter characteristics such as voltage and current gain, input power factor are completely analysed. Transition characteristics are also analysed by a small-signal model. The usefulness of the models is verified through computer simulations with good agreements.

Implementation of the current source matrix converter with space vector modulation

The paper deals with three-phase AC/AC frequency converter. Implementation of the current source matrix converter (CSMC) with space vector modulation (SVM) is presented. The specialized DSP and FPGA cards are used in the control circuit realization. Experimental test results of ca 1 kVA laboratory model are presented to confirm of the discussed CSMC properties.

A comparison of basic properties of the integrated and cascade matrix-reactance frequency converters

The paper deals with three-phase AC/AC frequency converters without DC storage. The integrated and cascade matrix-reactance frequency converters (MRFC) are analysed and discussed. The integrated MRFC are based on PWM AC unipolar matrix-reactance choppers (MRCs) with integrated voltage or current source matrix converter (MC). In the second solution of the MRFC the cascade connection of the MRC with MC is used. Results of the theoretical analysis and simulation test results are taking into account in order to comparison the steady state properties of mentioned converters. Experimental test results of ca 1 kVA laboratory models are presented to validate the theoretical and simulation ones.

Switched Reluctance Motor and its Mathematical Model

The constructive schemes of switched reluctance motor and basic electrical scheme of a commutator with capacity buffers of energy are circumscribed. A mathematical model to a research of electromechanical processes in electric drives with switched reluctance motor with buffers of an energy is explained.

Study of the current source matrix converter using model predictive control in AC drive system

This paper deals with AC drive system with frequency converter (FC) without DC storage. It contains description of operation, modelling and simulation test results of the AC drive system fed by current source matrix converter (CSMC) using model predictive control (MPC). Predictive model of the system with models of the CSMC, load and input circuits are used. In the cost function the appropriate load parameters and input power factor are taken into account. There are also presented the steady and transient state results of simulation studies of the drive system with 5 kW induction machine fed by proposed CSMC.

Analyse of steady-state process in circuits with incommensurable frequencies of voltage sources

The paper presents the study of a processs calculation in circuits with incommensurable frequencies. In such circuits the analysis of processes is realized by the use of an additional independent variable. Definitions of RMS currents, voltages and active power are introduced on the base of double integrals. Calculations of an active power in circuits with two independent voltage sources and a single-phase half-bridge inverter are presented.

Modelling and analysis of three-phase hybrid transformer with buck-boost matrix-reactance chopper and active load

This paper deals with a three-phase power system with hybrid transformer (HT). The HT contains a conventional transformer with electromagnetic coupling and PWM AC line chopper integrated with the secondary windings through an electric coupling. The HT uses a three-phase Yy connected transformer with additional secondary windings and three-phase PWM AC line chopper with buck-boost topology. The paper gives a description of the three-phase power system with hybrid transformer (HT) and unsynchronized active load, as well as the mathematical and circuit models of the AC source with HT. The analysis of basic steady state properties of these models are verified by means of the simulation and experimental test results obtained for the power system with HT of about 6 kVA.

Alternative drive solution with matrix converter fed permanent magnet synchronous motor

The paper presents study of a drive system with matrix converter fed permanent magnet synchronous motor. In the control system is implemented a rotor-oriented vector control and a space vector modulation of output currents. The system simulation, experimental test results and comparison of both are presented. The main aim is to show a drive system with a matrix converter as an alternative solution of drive system with precise control for application in robotics.

Computer aided investigation system of the switched reluctance motors

The paper describes a system for automated, i.e. computer aided investigation of electric drives with switched reluctance motors in the design phase. The system usage and the obtained results are presented.