Use Of Matrix Converter Research Articles

Matrix Converters With Input Resonance Suppression for Electric Haulage Vehicles

Matrix converter is an attractive choice for motor drives with weight/size restrictions and high efficiency requirements, such as electric haulage vehicles used in mining. However, the use of matrix converters requires addressing a potential issue with input resonance, which can be exacerbated when using long feeders or trailing cables. This article addresses this problem by proposing a novel solution based on principles of modern control but shaped as a classical feedback architecture. Along with high quality reference tracking, the proposed solution utilizes the frequency changing properties of matrix converters to attenuate the input filter resonance by spectral shaping of the output current. This article shows that the solutions achieves its goals. Design and implementation details are discussed. This article results are validated by simulations and experiments.

Constant Switching Frequency DTC for Matrix Converter Fed Speed Sensorless Induction Motor Drive

The paper presents a constant switching frequency scheme for speed sensorless Direct Torque Control (DTC) of Matrix Converter fed Induction Motor Drive. The use of matrix converter facilitates improved power quality on input as well as motor side, along with Input Power Factor control, besides eliminating the need for heavy passive elements. Moreover, DTC through Space Vector Modulation helps in achieving a fast control over the torque and flux of the motor, with added benefit of constant switching frequency. A constant switching frequency aids in maintaining desired power quality of AC mains current even at low motor speeds, and simplifies input filter design of the matrix converter, as compared to conventional hysteresis based DTC. Further, stator voltage estimation from sensed input voltage, and subsequent stator (and rotor) flux estimation is done. For speed sensorless operation, a Model Reference Adaptive System is used, which emulates the speed dependent rotor flux equations of the induction motor. The error between conventionally estimated rotor flux (reference model) and the rotor flux estimated through the adaptive observer is processed through PI controller to generate the rotor speed estimate.

Improvement of output current waveforms using SVM technique and fuzzy logic controller for matrix converter

Purpose – The use of power electronic equipment such as conventional AC-DC-AC converters cause several problems in electrical networks and its components. They generate harmonic currents and disturb the electrical power sources; so, it is necessary to research alternative topologies of power electronic converters based on advanced intelligent controllers, which reduce or even eliminate harmonics to achieve energy-saving and environmental protection. The use of matrix converter (MC) is, considered as an attractive solution to maintain pure sinusoidal input and output current waveforms. The paper aims to discuss this issue. Design/methodology/approach – The studied system is composed of a three phase matrix converter (TMC) feeding a linear R, L load and a trees phase rectifier considered as a non-linear load; the proposed control strategy is based on a fuzzy logic controller (FLC) associated to the (space vector modulation) SVM modulation technique, this choice is motivated by the advantages that represent the combination of FLC and SVM in term of power quality enhancement in both input and output sides of MC. Findings – The model is validated based on simulation results that illustrate the effectiveness of the proposed system in term of power quality amelioration. The high performance of the proposed FLC is illustrated in all study cases especially in the case of perturbed input voltage, it is not only able to keep the whole system stable, but also it reduces harmonic distortion THD to respect international standards recommendation. Originality/value – In this paper, an associated linear (RL), non-linear loads and TMC is studied. From the mathematical point of view, the MC is modeled and analyzed. From the technique point of view, the MC allows sinusoidal current absorbance from the network with good qualities in term of harmonic distortion compensation, and high reliability under various loads and disturbed input voltage.

Simulation and analysis of the harmonic behavior of matrix converters as compared with conventional converters

The type of the electronic converter used in a set based on power electronics has an important role in the performance of the set. For example, the quality of the converter in the drive system of a motor has a direct influence on the performance of the motor. In recent studies, the use of matrix converters in the drive system of motors has yielded very desirable results. One of the most important positive aspects of these converters, which has not been independently and thoroughly studied yet, is the quality of the signal produced with regard to the harmonic content. This is a very important subject in cases such as the drive system of electric motors, and if it is not taken into account in the design, serious problems will result. Due to the importance of the subject mentioned, this positive aspect of the matrix converters is independently studied in this article. To this end, the quality of the output signal of a two-phase matrix converter is studied and comparisons are made to clarify the relative superiority of this converter over conventional ones. Key words: matrix converter, total harmonic distortiontotal (thd), conventional converter, harmonic behavior.

The use of matrix converters in direct torque control of induction machines

In this paper, a new control method for matrix converters is proposed which allows, under the constraint of unity input power factor, the generation of the voltage vectors required to implement the direct torque control (DTC) of induction machines. Using this control method, it is possible to combine the advantages of matrix converters with the advantages of the DTC schemes. Some numerical simulations are carried out, showing the effectiveness of the proposed method in steady-state and transient conditions. Some experimental tests were also carried out demonstrating the practical feasibility of this control scheme.