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

V req
Creation
of Rotating
Vector
Re{ V ρ ij }
Im{ V ρ ij }
Calculation
of
Conduction
Times
Δ T , ΔT , ΔT
o
i
j
Look-Up
Table
for Gate
Pulses
Gate
Signals
g
1 − > 6
δ Vreq
V ρ
ij
Calculation of
Neighboring
Six Step
Voltages
V
ρ
, V
ρ
i
j
Figure 6.13 Gate Pulse Generator Block for Space Vector Modulation.
This modulation technique guarantees a constant switching frequency because at every period
the sequence of conducting times will be started anew. The rotating vector changes at every
switching period as it rotates, but even if it was held constant, the switching sequence would still
repeat voltage V ρ i
for time T
i
, V ρ j
for time T
j
and V ρ o
for time T
o
: that is the switches would not
be locked to a constant position forever.
90