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Concept of theSVPWM technique

The groupof theDPWMalgorithms include:

•

In this technique that reference voltage is selected from the three reference

voltages of a three-phase system, which has the lowest value at the time of

sampling. The associated phase is then no longer modulated for that time

period, i.e. the correlated power semiconductors are not switched. This is

practically the omission of the vector V

0

. Therefore the switching losses drop

and the conduction losses of the inverter bottom side IGBTs increase.

•

In this technique that reference voltage is selected from the three reference

voltages of a three-phase system, which has the highest value at the time of

sampling. The associated phase is then no longer modulated for that time

period, i.e. the correlated power semiconductors are not switched. This is

practically the omission of the vector V

7

. Therefore the switching losses drop

and the conduction losses of the inverter top side IGBTs increase.

•

In this technique that reference voltage is selected from the three reference

voltages of a 3-pase system, which is between the lowest and the highest

value at the time of sampling. The associated phase is then no longer

modulated for that time period, i.e. the correlated power semiconductors are

not switched. This is practically the alternating omission of the vectors V

0

and

V

7

.

•

(GeneralisedDiscontinuousPWM)

This technique generally describes the sub-algorithms DPWM0, DPWM1 and

DPWM2. These techniques are mainly based on the DPWMMAX algorithm

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