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Full form of UPFC is
Unified Power Flow Controller
Unified Power Factor Controller
Unified Power Flow Compensator
Unique Power Flow Controller
Unified Power Flow Controller
The Unified Power Flow Controller (UPFC) is a versatile FACTS (Flexible ACTransmission System) device that can control both active and reactive power flow in a transmission line simultaneously. It uses two back-to-back voltage source converters connected via a common DC link.
The Unified Power Flow Controller (UPFC) is a versatile FACTS (Flexible ACTransmission System) device that can control both active and reactive power flow in a transmission line simultaneously. It uses two back-to-back voltage source converters connected via a common DC link.
P=XV1тАЛV2тАЛтАЛsin(╬┤) тАФ Represents active power flow
Q=XV1тАЛтАЛ(V1тАЛтИТV2тАЛcos(╬┤)) тАФ Represents reactive power flow
The UPFC consists of a shunt converter and a series converter. The shunt converter (STATCOM) controls the bus voltage and manages the DC link energy, while the series converter (SSSC) injects a controllable voltage vector in series with the line. By varying the magnitude and phase of the injected voltage, it can control the real and reactive power flow independently.
UPFC is the most sophisticated and expensive FACTS controller.
It provides simultaneous control of voltage, impedance, and phase angle.
The shunt converter regulates the DC bus voltage.
The series converter provides series compensation.
Simultaneous control of all system parameters
High flexibility in power flow management
Dynamic voltage stability enhancement
High capital cost
Complexity in control algorithms
High losses due to multi-converter operation
Power flow control in congested transmission lines
Dynamic stability improvement and damping of oscillations
UPFC is classified as a multi-variable FACTS controller.
Option B (Unified Power Factor Controller) is a distractor, as UPFC is not limited to power factor correction.
A is correct тАФ The UPFC stands for Unified Power Flow Controller, representing the most powerful FACTS device capable of independent control of active and reactive power.
Always remember that UPFC provides independent control of P and Q, whereas simpler devices like SSSC or STATCOM control only one aspect.