Matrix Converter | Basic Principle Of Matrix Converter !!
The matrix converter uses the matrix of switches so that any of the input phase voltage
can be connected to any of the output load phase. There is exactly one switch for each
of the possible connections between supply and load.
Circuit diagram and operation:
*A shown in this circuit diagram, Sp. S and SB, are the switches that connect any of
the input to load phase r.
*Similarly the switches SR Sby and Sbb connect any of the input to load phase yb. And
the switches SR S and S connect any of the input to load phase b.
*The input LC filter is used to eliminate harmonic currents in the input side.
*T29 = 512 combinations but only 9 combinations are used.
 |
| Circuit diagram of matrix converter |
*The switches are controlled in such a way that there is no short circuit of the input supply
The load voltages v, vy, v are related to supply voltages VR Vy and V by following
matrix equation,
 |
The maximum voltage transfer ratio is 0.866
Advantages :
1. Inherent bidirectional power flow control
2. Input-output waveforms are sinusoidal.
3. No dc-link is required, hence it is compact
4. Power factor is controlled by independent control of load current
Disadvantages:
1. The switches are not available for high powers
2. Implementation is complex.
3.The maximum voltage transfer ratio is limited
4. The switches required protection and commutation circuit which makes the converter
bully.
Applications:
1. Matrix converters are used for low power 3-phase AC controllers.
2. It is used for power factor control.
Matrix converters are defined by sinusoidal waveforms that show the input and output switching frequencies.
So, The three methods of matrix converter control :
Space vector modulation
Pulse width modulation
Analysis of function transfer
So, this is all basic of matrix converter. I hope this will help !!
