The document discusses Flexible AC Transmission Systems (FACTS), which utilize controllers to manage various system parameters like impedance and voltage. It explains the types of controllers, including series and shunt controllers, and their configurations such as combined series-series and series-shunt controllers. It highlights the advantages of FACTS, including enhanced voltage control, improved transient stability, and increased power transfer capabilities.

1. FLEXIBLE AC
TRANSMISSION SYSTEM
By,
Brunda Rajesh
Department of EEE
Dr.AIT

2. What is FACTS?
The FACTS technology is a collection of controllers,
which can be applied individually or in coordination
with others to control one or more of the interrelated
system parameters, such as series impedance, shunt
impedance, current, voltage, and damping of
oscillations.

3. Series
controllers
Shunt
controllers
Combined
series-
series
controller
Combined
series-
shunt
controller

4. Series controller
>The series controller could be a variable impedance or a
variable source both are power electronics based. In principle,
all series controllers inject voltage in series with the line.
Shunt controller
>The shunt controllers may be variable impedance connected
to the line voltage causes a variable current flow hence
represents injection of current into the line.

5. Combined series-series controllers:
The combination could be separate series
controllers or unified series-series
controller--- Interline Power Flow Controller.
Combined series-shunt controllers:
The combination could be separated series
and shunt controllers or a unified power flow
controller

7. STATCOM-Static Synchronous Compensator
>A synchronous compensator=synchronous machine
>operation=by controlling the field current of the synchronous machine
Any amount of positive or negative reactive power can be injected into
the system
>Consists –battery and voltage source converter connected in Parallel
through a transformer
>control-through firing angle of GTO’s
>advantage-response is very fast & has symmetric lead-lag capability

8. STATCOM-widely used in Japan and USA.

9. UPFC-Unified Power flow Controller

12. ADVANTAGES OF FACTS:
>Dynamic voltage control
>increase in transient stability limit
>Reduction in power loss
>improvement in voltage profile
>increase in power transfer capability

13. THANK YOU
BY
BRUNDA RAJESH
EEE DEPARTMENT
THIRD SEMISTER