ELECTRIC POWER CONVERSION
USING MATRIX CONVERTOR
Institute of Engineering, Pashchimanchal Campus
Lamachaur-16, Pokhara
Contact
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References
Abstract
Introduction
Methods and Materials
Discussion
Conclusions
Results
Figure 1. Label in 16pt Calibri.
Figure 2. Label in 16pt Calibri.
Chart 1. Label in 16pt Calibri.
Department of
Electrical Engineering
Power conversion from AC voltage into an AC voltage with desired magnitude and frequency is becoming increasingly popular in utility grid connected loads. Matrix Converters are an appropriate solution for single stage AC-AC conversion, providing bidirectional power flow. This project introduces shunt active power filter to compensate total harmonics distortion efficiently, reducing harmonic pollution and increasing power quality. The developed compensating current will be calculated by using P-Q theory, and the proposed approach of removing harmonics by using instantaneous reactive power theory is to be tested and evaluated by using MATLAB/Simulink.
Matrix converters (MCs) that provides the direct ac to ac power conversion to get the an ac voltage output of variable amplitude and frequency Matrix converters have been studied to achieve high efficiencies, long lifetime, size reduction, and unity power factors for medium voltage converters. They do not require electrolytic capacitors, which account for most of the volume and cost of medium-voltage converters.
They convert fixed voltage to voltage with variable amplitude and frequency, providing output regulation with variable frequency control and can have high power density with more reliable operation. MCs are reversible to obtain variables amplitude and frequency of sinusoidal output voltages in order to adjust the power factor and the input harmonic distortion.
The direct matrix converter is used to directly connect m-phase power alternative source to n-phase load, via an m * n dimensions matrix array of bidirectional switch. There are 27 possible states of combination which can be classified into three groups: active configurations, three states of zero vector voltage and current, and six combinations of MCs.
Main objective of SVM is to generate a switching sequence that corresponds to the reference voltage vector, for every PWM period to achieve a continuously rotating space vector.
The control is tested with an ideal nine-switch three phases to three phase matrix converter feeding a Non Linear Load. For this purpose, digital simulations are carried out using MATLAB/Simulink software.
After using the MC, single stage AC TO AC power conversion is obtained with variable voltage amplitude. It is being driven by the PWM under SVM algorithm. So, the load is being driven by the output obtained from the MC. The power factor of MC is maintained unity.
Applications
Matrix converters have advantages such as high power density, high efficiency, low input current harmonics, and the ability to perform AC-to-AC power conversion without an intermediate DC link, but also disadvantages such as complexity, low power factor, and limited voltage range.
Figure 2 . Overall Block Diagram.
Figure 1. Methodology in short form.
Figure 3. Output Waveform