FACTS BY SVC, FLEXIBLE AC TRANSMISSION

Presentation Overview Background What are FACTS? Block diagram Project Scope Static VAR Compensator Circuit Conclusion Reference

Dynamics of Large Electric Power Systems Simple illustration of the power transmission system Power system structure = PGenerator + PLoad + PCompensation = QGenerator + QLoad + QCompensation S = P + jQ

V voltage X reactance phase angle I current Apparent Complex Power: S = P + jQ Real Power: Reactive Power: V voltage X reactance phase angle I current

FACTS devices = Flexible Alternating Current Transmission System devices Direct control of power flow over designated transmission routes Fast Control Technology to overcome limitations to Power Transfer Capability through rapid response

Project Scope Understanding the modeling framework using microcontroller Integrating the SVC model Potential FACTS device models for integration

Static VAR Compensation under FACTS uses TSC (Thyristor switched capacitors) based on shunt compensation duly controlled from a programmed microcontroller.

Integrating the Static VAR Compensator (SVC) model SVC dynamic Model

SVC The Static VAR Compensator (SVC) is a shunt device of the Flexible AC Transmission Systems (FACTS) family using power electronics to control power flow and improve transient stability on power grids The SVC regulates voltage at its terminals by controlling the amount of reactive power injected into or absorbed from the power system. When system voltage is low, the SVC generates reactive power (SVC capacitive). When system voltage is high, it absorbs reactive power (SVC inductive).

The variation of reactive power is performed by switching three-phase capacitor banks and inductor banks connected on the secondary side of a coupling transformer. Each capacitor bank is switched on and off by three thyristor switches (Thyristor Switched Capacitor or TSC).

Conclusion The designed circuit shows the overall effect of the whole system due to use of FACTS devices installed locally. Control Strategies can be developed by designing the pattern and timing of the control input signal of the dynamic FACTS model, as well as where the FACTS device should be located in the transmission system.