SPACE VECTOR MODULATION FOR THREELEG VOLTAGE SOURCE INVERTERS

08102012, 05:17 PM
Post: #1




SPACE VECTOR MODULATION FOR THREELEG VOLTAGE SOURCE INVERTERS
SPACE VECTOR MODULATION FOR THREELEG VOLTAGE SOURCE INVERTERS [30929] THREELEG VOLTAGE SOURCE INVERTER The topology of a threeleg voltage source inverter is Because of the constraint that the input lines must never be shorted and the output current must always be continuous a voltage source inverter can assume only eight distinct topologies. These topologies are shown on Fig. 2.2. Six out of these eight topologies produce a nonzero output voltage and are known as nonzero switching states and the remaining two topologies produce zero output voltage and are known as zero switching states. SPACE VECTOR MODULATION The desired three phase voltages at the output of the inverter could be represented by an equivalent vector V rotating in the counter clock wise direction as shown in Fig. 2.6(a). The magnitude of this vector is related to the magnitude of the output voltage (Fig. 2.6(b)) and the time this vector takes to complete one revolution is the same as the fundamental time period of the output voltage. RIGHT ALIGNED SEQUENCE (SVM1) A simple way to synthesize the output voltage vector is to turnon all the bottom (or top) switches at the beginning of switching cycle and then to turn them off sequentially so that the zero vector is split between V7(ppp) and V8(nnn) equally. This switching scheme is shown in Fig. 2.8 for two sampling periods. The signals in the figure represent the gating signals to the upper legs of the inverter. The scheme has three switch turnon’s and three switch turnoff’s within a switching cycle. The performance of the left aligned sequence, where the sequence of vectors is exactly opposite to the right aligned sequence, is expected to be similar to the right aligned sequence. Alternating Zero Vector Sequence (SVM3) In this scheme, known as DI sequence in literature [6], the zero vectors V7(ppp) and V8(nnn) are used alternatively in adjacent cycles so that the effective switching frequency is halved 

08102012, 05:17 PM
Post: #2




SPACE VECTOR MODULATION FOR THREELEG VOLTAGE SOURCE INVERTERS
SPACE VECTOR MODULATION FOR THREELEG VOLTAGE SOURCE INVERTERS
[attachment=30929] THREELEG VOLTAGE SOURCE INVERTER The topology of a threeleg voltage source inverter is Because of the constraint that the input lines must never be shorted and the output current must always be continuous a voltage source inverter can assume only eight distinct topologies. These topologies are shown on Fig. 2.2. Six out of these eight topologies produce a nonzero output voltage and are known as nonzero switching states and the remaining two topologies produce zero output voltage and are known as zero switching states. SPACE VECTOR MODULATION The desired three phase voltages at the output of the inverter could be represented by an equivalent vector V rotating in the counter clock wise direction as shown in Fig. 2.6(a). The magnitude of this vector is related to the magnitude of the output voltage (Fig. 2.6(b)) and the time this vector takes to complete one revolution is the same as the fundamental time period of the output voltage. RIGHT ALIGNED SEQUENCE (SVM1) A simple way to synthesize the output voltage vector is to turnon all the bottom (or top) switches at the beginning of switching cycle and then to turn them off sequentially so that the zero vector is split between V7(ppp) and V8(nnn) equally. This switching scheme is shown in Fig. 2.8 for two sampling periods. The signals in the figure represent the gating signals to the upper legs of the inverter. The scheme has three switch turnon’s and three switch turnoff’s within a switching cycle. The performance of the left aligned sequence, where the sequence of vectors is exactly opposite to the right aligned sequence, is expected to be similar to the right aligned sequence. Alternating Zero Vector Sequence (SVM3) In this scheme, known as DI sequence in literature [6], the zero vectors V7(ppp) and V8(nnn) are used alternatively in adjacent cycles so that the effective switching frequency is halved 

12052012, 04:18 PM
Post: #3




RE: SPACE VECTOR MODULATION FOR THREELEG VOLTAGE SOURCE INVERTERS
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12052012, 04:18 PM
Post: #4




RE: SPACE VECTOR MODULATION FOR THREELEG VOLTAGE SOURCE INVERTERS
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