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Power system stability and control using facts devices


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Facts are the most advanced devices to control the power system's active and reactive power via use of general inductor and capacitors.

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Power system stability and control using facts devices

  1. 1. ON 2013-2014 ELECTRICAL ENGINEERING VIVEKANANDA INSTITUTE OF TECHNOLOGY,JAIPUR Ajit Singh Rajawat VIII th semester Electrical Branch Mr. Pawan Kumar Sharma Electronics Department Presented To :- Presented By :- Power SystemStability & control using Facts devices
  2. 2. Contents  What is FACTS?  Basic types of FACTS Controllers  Shunt connected controllers  Series connected controllers  Combined shunt and series connected controllers  Static VAR Compensator  Static Series Synchronous Compensator  Unified Power Flow Controller  Thyristor Controlled Series Compensator  Advantages of FACTS Devices  Application of FACTS Devices
  3. 3. What is FACTS?  (FACTS) is defined as `Alternating current transmission systems incorporating power electronic-based and other static controllers to enhance controllability and increase power transfer capability'
  4. 4. Basic types of FACTS Controllers  Series controllers: 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 controllers: 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.  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
  5. 5. Shunt connected controllers Shunt compensation is used to influence the natural electrical characteristics of the transmission line to increase the steady-state transmittable power and to control the voltage profile along the lin
  6. 6. Series connected controllers The control strategy of the SSVC is typically based on achieving an objective line power flow in addition to the capability of damping power oscillations.
  7. 7. Combined shunt and series connected controllers
  8. 8. Static VAR Compensator  A shunt-connected static var generator or absorber whose output is adjusted to exchange capacitive or inductive current so as to maintain or control specific parameters of the electrical power system (typically bus voltage)
  9. 9. Static Series Synchronous Compensator  This type of series compensation can provide a continuous degree of series compensation by varying the magnitude of Vc. Also, it can reverse the phase of Vc, thereby increasing the overall line reactance; this can be desirable to limit fault current, or to dampen power oscillations.
  10. 10. Unified Power Flow Controller 1.It can be used to enhance steady state stability, dynamic stability and transient stability. 2.The UPFC is capable of both supplying and absorbing real and reactive power and it consists of two ac/dc converters. 3.Series converter can exchange real power with the transmission line and thus improves the power flow capability of the line as well as its transient stability limit. 4.It is normally controlled to balance the real power absorbed from or injected into the power system by the series converter plus the losses by regulating the dc bus voltage at a desired value.
  11. 11. Thyristor Controlled Series Compensator •The TCSC behaves as a tunable parallel LC-circuit to the line current. As the impedance of XL is varied from its maximum (infinity) toward its minimum wL , the TCSC increases its capacitive impedance.
  12. 12. FACTS devices v/s Conventional Devices  Fast Acting Switching Response  Greater Reliability  Improve voltage Stability of power system  Very low loss of energy in power system
  13. 13. Advantages of FACTS Devices  Better utilization of existing transmission system assets  Increased transmission system reliability and availability  Increased dynamic and transient grid stability and reduction of loop flows  Increased quality of supply for sensitive industries  Environmental benefits Better utilization of existing transmission system assets
  14. 14. Application of FACTS Devices 1. They contribute to optimal system operation by reducing power losses and improving voltage profile. 2. The transient stability limit is increased thereby improving dynamic security of the system and reducing the incidence of blackouts caused by cascading outages. 3. The steady state or small signal stability region can be increased by providing auxiliary stabilizing controllers to damp low frequency oscillations. 4. The problem of voltage fluctuations and in particular, dynamic over- voltages can be overcome by FACTS controllers
  15. 15. THANK YOU