STATIC VAR COMPENSATOR IN POWER SYSTEM TUTORIAL PDF LINKS

Static VAR Compensators are electrical devices that provides fast-acting reactive power (hence the var) on high-voltage electricity transmission networks or power system. Electrical loads both generate and absorb reactive power. Since the transmitted load varies considerably from one hour to another, the reactive power balance in a grid varies as well. The result can be unacceptable voltage amplitude variations, a voltage depression, or even a voltage collapse.

Installing an SVC at one or more suitable points in the network will increase transfer capability through enhanced voltage stability, while maintaining a smooth voltage profile under different network conditions. In addition, an SVC can mitigate active power oscillations through voltage amplitude modulation.

A rapidly operating Static Var Compensator (SVC) can continuously provide the reactive power required to control dynamic voltage swings under various system conditions and thereby improve the power system transmission and distribution performance.  - Courtesy of ABB

Static Var Compensator (SVC) SVC is an advanced capacitor bank using Thyristor for providing fast-acting reactive power compensation on high voltage electricity transmission networks. SVC is an automated impedance matching device, designed to bring the system closer to unity power factor.

For more about static var compensation, here are chose links to tutorials and downloads relating to static var compensation:

This paper presents an application of a Static Var Compensator (SVC). A SVC is one of the controllers based on Power Electronics and other static devices known as FACTS (Flexible AC Transmission Systems) Controllers which it could be used to increase the capacity and the  flexibility of a transmission network. Read more...

This paper presents an evolutionary computation algorithm for enhancing voltage stability. GAs will determine the most vulnerable bus in the power system, where the Static VAR Compensator (SVC) is needed to be installed at that bus as well as considering installation cost of SVC.  The developed  algorithms have successfully obtained the best solution for optimal placement of SVC in the IEEE 9 buses system and TNB northern area 275kV 14-bus system. Read more...
The purpose of the compensator is to provide dynamic voltage control and reduce fast voltage variations created by the operation of two DC arc furnaces, each rated at 130 MVA. Two ladle furnaces, each rated at 21.5 MVA, are being compensated as well. Dynamic power factor correction is also provided by the SVC, achieving an overall power factor for the plant of close to unity during all operational conditions. Read more...
A  new static var compensator(SVC)  system  using  three-level inverter is proposed  f o r   high voltage  and  high  power  applications.  A  general and  simple  model  f o r   the  overall system  is  obtained using circuit DQ-transform and DC and  AC  analyses  are  achieved  to characterize  the  open-loop system. Using  the  proposed model, a new control method which controls both  the phase angle  and  modulation index  of  switching  pattern simultaneously  is  suggested  to  provide  fas t   response  of SVC system  without  using  independent voltage source. Finally, predicted results are  verified  by computer simulation. Read more...

OPTlMlZATlON OF STATIC VAR  SYSTEMS PARAMETERS  FOR  STABlLlZlNG POWER  SYSTEMS OSCILLATIONS
The  search for SVC parameters which can effectively damp the electromechanical oscialltions and sollve the power transfer problem necessitate a wide variation for each parameter and the study of system priorities due to each variation of these parameters. Therefore, adequate models for the SVC and other componentsa are carefully selected. Read more...

Solutions for Static Var Compensator
High-power rapid impact loads, rapid growth of asymmetrical impact loads like electrified railway, increase in distributed wind power generation equipments, connections/disconnections of large loads and inevitable power system faults, are adverse factors which can lead to considerable reactive disturbances in power system and affect power stability, power quality and economy of power grid operation. It is essential to adjust reactive power in the power grid expeditiously to achieve a reasonable power flow distribution, which is also very important in phase modulation, voltage regulation and overvoltage restriction. Read more...

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