Energy Electronics – Matrix Converters

A matrix converter is outlined as a converter with a single stage of conversion. It makes use of bidirectional managed change to attain automated conversion of energy from AC to AC. It offers a substitute for PWM voltage rectifier $d o u b l e s i d e d$ .

Matrix converters are characterised by sinusoidal waveforms that present the enter and output switching frequencies. The bidirectional switches make it potential to have a controllable energy issue enter. As well as, the dearth of DC hyperlinks ensures it has a compact design. The draw back to matrix converters is that they lack bilateral switches which are absolutely managed and in a position to function at excessive frequencies. Its voltage ratio that’s output to enter voltage is restricted.

There are three strategies of matrix converter management −

Area vector modulation
Pulse width modulation
Venturi – evaluation of perform switch

The Matrix Converter Circuit

The diagram given beneath reveals a single-phase matrix converter.

Matrix Converters

It incorporates 4 bi-directional switches with every change being able to conduct in each ahead blocking and reverse voltage.

Area Vector Modulation $S V M$

SVM refers to a technique of algorithm used to regulate the PWM. It creates AC waveforms that drive AC motors at numerous speeds. Within the case of a three-phase inverter having DC provide energy, its three predominant legs on the output are related to a 3-phase motor.

The switches are beneath management to make sure that no two switches in the identical leg are ON on the similar time. Simultaneous ON states may consequence within the DC provide shorting. This results in eight switching vectors the place two are zero and 6 are energetic vectors for switching.

A single-phase AC voltage converter has the next particulars −

ON time = 6 min, OFF time = Four min, frequency = 50Hz, and

Voltage supply V_o = 110V

Calculate the next.

Triggering angle α

Answer −

$T = 2 \times (T_{O N} + T_{O F F})$ however $f = 50 H z,$ $T = 2 \times (6 + 4) = 20 m i n s$

$360^{\circ} = 20 m i n,$ $1 m i n = 18^{\circ}$

Subsequently, $T_{O F F} = 4 m i n$

Then,

α = 4 0.1 \times 1.8 = 72 \circ

Voltage Output

Answer −

V 0 = (V S \times D), w h e r e D = T O N T O N + T O F F = 6 10 = 0.6

T O N = 6 m i n, T O F F = 4 m i n, V S = 110 V

V 0 (V o l t a g e O u t p u t) = V S \times D = 110 \times 0.6 = 66 V o l t s

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Energy Electronics – Matrix Converters

The Matrix Converter Circuit

Area Vector Modulation SVMSVM

Triggering angle α

Voltage Output

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Area Vector Modulation $S V M$