1. Static Synchronous Compensator (Statcom) is a member of Flexible AC Transmission System (FACTS) devices that uses power electronics to control voltage and reactive power on AC transmission networks. 2. A Statcom consists of a voltage source converter with a DC capacitor that generates a voltage in phase or 180 degrees out of phase with the transmission line to inject or absorb reactive power. 3. Statcoms provide benefits like increasing transmission line loading capacity, improving power flow control and system stability, and dynamic reactive power compensation with response times less than 10 milliseconds.

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2. Introduction of statcom
Topic

3. objective
Today · changing electric power systems create a growing need for
Reliability, flexibility, fast response and accuracy.
Flexible Alternating Current Transmission Systems are new
devices emanating from recent innovative technologies that are
maintain altering voltage phase angle

4.  In power system, real power and reactive power is
controlled by the voltage and phase angle difference
between the sending end and receiving end
respectively. Impedance of the transmission line can
also be used to control real and reactive power.
Flexible AC Transmission Systems (FACTS) are used to
improve the power transfer capability of transmission
line.
EXISTING SYSTEM

5.  THYRISTOR CONTROL REACTOR
 THYRISTOR SWITCHED CAPACITOR
 STATIC VAR COMPENSATOR
 THYRISTOR SWITCHED SERIESCOMPENSATOR
 STATIC COMPENSATOR
 SELF COMMUTATED COMPENSATOR
 UNIFIED POWER FLOW CONTROLLER
Different fact devices

6.  INCREASE THE CAPABILITY OF LOADING OF LINES TO
THEIR THERMAL CAPABILITES
 INCREASE THE SYSTEM SECURITY THROUGHT RISING
THEIR TRANSIENTSTABILITY LIMIT
 CONTROL OF POWER FLOW AS ORDERED
REDUCE REACTIVE POWER FLOW
Benefits of devices

7. Static Synchronous Compensator
Statcom
 static synchronous compensator, is a regulating
device used on ac current electricity transmission
networks. It is based on a power electronics voltage-
source converter and can act as either a source or
sink of reactive AC power to an electricity network. If
connected to a source of power it can also provide
active AC power It is a member of the FACTS family of
devices.

8. Structure of Statcom
STATCOM (Static Synchronous Compensator)

9. Connection block Diagram

10.  Voltage-Source Converter (VSC)
 DC Capacitor
 Inductive Reactance (X)
 Harmonic Filters
Components of Statcom

11. Square-wave Inverters using Gate
Turn-Off Thyristor
GTO-based STATCOM Simple Diagram

12.  A gate turn-off thyrisistor (GTO) is a special type of
thyrisistor, which is a high-power semiconductor
device. It was invented at General Electric. GTOs, as
opposed to normal thyrisistors are fully controllable
switches which can be turned on and off by their third
lead, the GATE lead.
What is GTO

13. Diagrams

14.  CONTINUOUS AND DYNAMIC VOLTAGECONTROL
 HIGH EFFICIENCY
 HIGH DYNAMIC VERY FAST RESPONSE TIME
 SINGLE PHASE CONTROL FOR UNBALANCED LOADS
 REACTIVE POWER COMPENSATION
Main Advantages

15.  The static synchronous compensator (STATCOM) is
increasingly popular in power system application. In
general, power factor and stability of the utility
system can be improved by STATCOM. Specifically
Why this device is used

16.  Voltage support and control
Voltage fluctuation and flicker mitigation
Unsymmetrical load balancing
Power factor correction
Active harmonics cancellation
Improve transient stability of the power system
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17.  The STATCOM has the ability to provide more
capacitive reactive power during faults, or when the
system voltage drops abnormally, compared to
ordinary static var compensator. This is because the
maximum capacitive reactive power generated by a
STATCOM decreases linearly with system voltage,
while that of the SVC is proportional to the square of
the voltage. Also, the STATCOM has a faster response
as it has no time delay associated with thyristor firing.
Statcom vs. SVC

18. Phase diagram

19.  When operating as a pure STATCOM (without losses or
SMES attached) the generated voltage is exactly in phase
with the AC system voltage. If the generated voltage is
greater that the terminal voltage then the device will
supply VARs (i.e. is capacitive) to the system. If the internal
voltage is less than the terminal voltage, the device will
absorb VARS (i.e. is inductive) from the system. The
control system of the STATCOM is extremely fast and
therefore can rapidly change the magnitude (and phase) of
the electronically generated voltage.
System of Statcom

20. Diagram

21.  Ultra dynamic response (<10ms)
 No steps
 Ind. + cap. Capabilities
 Low harmonics no filters required
 Cheaper than SVC below §50MVAR
Characteristics of Statcom

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