Control and Design of Microgrid Components - Power Systems ...

g 4 ) can never be closed at the same time to avoid shorting the DC voltage source and one switch
per leg must always be closed to provide a path for the AC current to flow.
V DC
+
g 1
g 2
g3
Inverter
Terminals
C
g 4 g 5 g 6
B
A
Figure 6.9 Inverter Switch Topology.
This section shows the implementation of the space vector modulation technique to synthesize
the voltage at the terminals of the inverter.
Gate Pulse Generator
V
δ
V
Calculation of
Conduction Times
Δ t o
Δ t i
Δ t j
Look Up Table
For Switching
Positions
g
1
g
2
g
3
g
4
g
5
g
6
Figure 6.10 Voltage Control Blocks, Hardware with Space Vector Modulation.
Figure 6.10 summarizes the operations of the gate pulse generator as included in Figure 3.2. The
gate pulse generator is composed of a cascade of two blocks. The first block is responsible for
calculating the real and imaginary components of the voltage vector, starting from the magnitude
and angle. From the Cartesian components of the voltages the conduction times for each of the
tree voltages are calculated. Two of these voltages are active voltages, while the third one is the
zero vector. The conduction times will determine how long each vector will need to be applied
for ultimately synthesizing the requested voltage. The information on the conduction time is then
passed to another block, that reads on a look up table the switching sequence to apply at the gate
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