IEEE Power Electronics Magazine Compendium - March 2018 - 36
Operation of Inverters as a VSM
in Figure 1(b), includes the mathematical model (in red)
of a three-phase round-rotor synchronous machine as the
core. The back electromotive force e calculated according to the mathematical model is passed through a
pulsewidth modulation (PWM) generation block to generate PWM pulses to drive the power semiconductors in
Figure 1(a). The currents flowing out of the inductors of
the power stage are treated as the stator current i and fed
back to the mathematical model. These two-way interactions link the power stage and the controller together.
In current power systems, the frequency is regulated
via controlling the real power, and the voltage is regulated via controlling the reactive power, which is often
As mentioned previously, a synchronverter [3] is an
inverter that mimics a conventional synchronous generator. It acts as an interface for smart grid integration. As a
result, distributed generation can easily take part in the
regulation of system frequency and voltage and provide
inertia and damping to the grid, as conventional synchronous generators do.
A synchronverter consists of a power part, which is
the same as a conventional power electronic converter
depicted in Figure 1(a), and an electronic part, which consists of the sensoring, protection, and control circuits.
The controller of a three-phase synchronverter, as shown
+
Ls, Rs
ea
Vdc
ic
ec
Circuit
Breaker
vb
ib
eb
Lg, Rg
va
ia
vga
vgb
vc
vgc
C
-
(a)
.
θr
Dp
PLL
-
θg
Reset
Pset
p
.
θn
Tm
.
θ
1
Js
θ
1
s
-
θc
Formulas
of Te, Q, e
Q
PWM
Generation
e
-
Qset
1
Ks
Mf if
i
-
Dq
Vm
Amplitude
Detection
Vr
(b)
FIG 1 The components of a synchronverter [3]: (a) the power stage and (b) controller.
36
IEEE PowEr ElEctronIcs MagazInE
From/To the Power Part
Te
z December 2016
Vfb
Table of Contents for the Digital Edition of IEEE Power Electronics Magazine Compendium - March 2018
Contents
IEEE Power Electronics Magazine Compendium - March 2018 - Cover1
IEEE Power Electronics Magazine Compendium - March 2018 - Cover2
IEEE Power Electronics Magazine Compendium - March 2018 - Contents
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