STATCOM (Static Synchronous Compensator)
It is a device connected in derivation, basically composed of a coupling transformer, that serves of link
between the electrical power system (EPS) and the
voltage synchronous controller (VSC), that generates
the voltage wave comparing it to the one of the electric
system to realize the exchange of reactive power. The
control system of the STATCOM adjusts at each
moment the inverse voltage so that the current injected
In the network is in cuadrature to the network voltage, Donsión
in these conditions P=0 and Q=0.
In its most general way, the STATCOM can be modeled as a regulated voltage source Vi connected to
a voltage bar Vs through a transformer.
STATCOM (Static Synchronous Compensator)
STATCOM -A VSC interfaced in shunt to a transmission line
Donsión
The STATic COMpensator(STATCOM)uses a VSC interfaced in shunt to a
transmission line. In most cases the DC voltage support for the VSC will be
provided by the DC capacitor of relatively small energy storage capability -
hence, in steady state operation, active power exchanged with the line has to be
maintained at zero, as shown symbolically in the Figure.
STATCOM (Static Synchronous Compensator)
STATCOM -A VSC interfaced in shunt to a transmission line
reactivepower
Donsión
With the active power constraint imposed, the control of the STATCOM is
reduced to one degree of freedom, which is used to control the amount of
reactive power exchanged with the line. Accordingly, a STATCOM is operated
as a functional equivalent of a static VAR compensator; it provides faster
control than an SVC and improved control range.
STATCOM (Static Synchronous Compensator)
Each GTO converter generates a voltage that is stepped up by a line-side-series-connected multi-stage converter transformer. The converter Donsión
transformer enables the build-up of a sine-wave voltage in both
magnitude and phase. Because STATCOMs with multi-stage converter
transformers do not generate significant internal harmonics, they
generally require minimal, or no, harmonic filtering. If the number of
firing pulses for the GTOs is increased (i.e., pulse-width modulation
(PWM) order), the harmonics are further decreased. High-side voltage is
generally used as a controller input, as indicated in the figure.
STATCOM (Static Synchronous Compensator)
The figure shows the
equivalent circuit of a
STATCOM system.The
GTO converter with a
dc voltage source and
the power system are
illustrated as variable ac
voltages in this figure.
These two voltages are Donsión
connected by a
reactance representing
the transformer leakage
inductance.
Equivalent circuit of a STATCOM

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