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SVC and STATCOM are______________ devices
Series connected
Shunt connected
Combined series-series connected
Combined serie-shunt connected
Shunt connected
SVC (Static Var Compensator) and STATCOM (Static Synchronous Compensator) are shunt-connected FACTS devices designed to regulate voltage at their point of connection. They inject or absorb reactive power to stabilize the transmission system voltage profile.
SVC (Static Var Compensator) and STATCOM (Static Synchronous Compensator) are shunt-connected FACTS devices designed to regulate voltage at their point of connection. They inject or absorb reactive power to stabilize the transmission system voltage profile.
Q=VsтАЛXVsтАЛтИТVcтАЛтАЛ тАФ Reactive power exchange mechanism
IstatcomтАЛ=jXeqтАЛVbusтАЛтИТVvscтАЛтАЛ тАФ STATCOM current injection
These devices operate by connecting in parallel with the transmission line (shunt). The SVC uses thyristor-controlled reactors and capacitor banks to vary reactive power, while the STATCOM uses a voltage source converter (VSC) to emulate a synchronous condenser, providing faster and more dynamic control of reactive power independent of the bus voltage magnitude.
Shunt devices are primarily used for voltage regulation.
SVCs use passive components switched by thyristors.
STATCOMs utilize solid-state power electronics (IGBTs/GTOs) to act as a variable voltage source.
These devices provide reactive power support to maintain system stability under varying load conditions.
Rapid voltage control
Enhanced power transfer capability
Improved transient stability
Reduced flicker and harmonic mitigation
High capital cost for power electronic converters
Generation of harmonic currents requiring filtering
Complexity in control algorithms
Voltage stability improvement
Reactive power compensation in grid substations
Dynamic support for wind farm grid integration
SVCs are historically earlier designs, while STATCOMs are modern VSC-based solutions.
Series-connected devices (e.g., TCSC, SSSC) are typically used for line impedance control, making option A incorrect.
B is correct тАФ Both SVC and STATCOM are shunt-connected devices that regulate the voltage at the node where they are connected by injecting or absorbing reactive power.
Always remember: Shunt devices control voltage by injecting reactive power, while series devices control power flow by modifying line impedance.