Flexible AC Transmission and HVDCs

These flashcards cover key concepts related to flexible AC transmission and high voltage direct current systems, helpful for exam preparation.

Conventional Power Grid

A power system where all sources must operate synchronously at the same frequency.

Automatic Generation Control (AGC)

A system that regulates the output of a generator by controlling its driving torque.

Excitation Control

A control mechanism that regulates the field excitation of a synchronous generator.

Transformer Tap-Changer Control

A method used to control voltage levels in transformers by adjusting taps.

Load Compensation

Adding a parallel capacitive load to counteract the reactive current of a load.

System Compensation

Installing a reactive power compensator to maintain voltage levels in a power system.

Reactive Power

Power that does not perform any work but is necessary for maintaining voltage levels in AC systems.

Voltage Source Converter (VSC)

A type of converter that uses transistors to convert DC to AC and vice versa.

Types of FACTS Devices

Devices that provide flexible AC transmission, including devices like STATCOM and SVC.

Thyristor Controlled Reactor (TCR)

A device that uses thyristors to control the current flow in inductors.

Static Var Compensator (SVC)

A device that uses switched capacitors and reactors to regulate voltages in transmission systems.

Power Oscillation Damping

A process to stabilize the power system by reducing oscillations in generator angle.

Dynamic Flow Controller (DFC)

A hybrid device that combines phase shifting and series compensation for power flow control.

Unified Power Flow Controller (UPFC)

A combination of shunt and series compensation to control power flows and improve stability.

HVDC (High Voltage Direct Current)

A technology for transmitting electricity over long distances using direct current.

Bipolar Link

A HVDC configuration with two conductors, allowing for increased reliability and capacity.

Monopolar Link

A HVDC configuration using one conductor and a ground or sea return.

Back-to-Back Converter

A configuration used to connect two AC networks that operate at different frequencies.

Power Quality Improvement

The enhancement of the voltage and current characteristics of the power supply.

Transient Stability

The ability of a power system to maintain stability after a disturbance.