A unified power flow controller (UPFC) is an electrical device for providing fast-acting reactive power compensation on high-voltage electricity transmission networks. The UPFC uses solid state devices, which provide functional flexibility, generally not attainable by conventional thyristor controlled systems.
What is the function of UPFC?
UPFC is one of the flexible ac transmission system (FACTS) compensation devices, it has a comprehensive compensation function, UPFC has the characteristic functions as follows: fast anddynamical adjusting the parameters of electricity transmission system, such as voltage, impedance, phase angle, active power and …
What are the operating mode of UPFC?
The series converter can operate either in power flow control (automatic mode) or in manual voltage injection mode. The UPFC can operate in the automatic power flow control mode keeping the active and reactive line power flow at the specified values. This can be achieved by the linearizing the line power flow.
Where was the first UPFC implemented?
Abstract. In engineering applications field, the UPFC project in western Nanjing power grid was put into operation by the end of 2015. It is the first UPFC project in China and also the world’s first UPFC project based on modular multilevel (MMC) technology.
What is UPQC?
UPQC is a multifunction power conditioner that can be used to compensate various voltage disturbances of the power supply, to correct voltage fluctuation, and to prevent the harmonic load current from entering the power system.
Which is the control attributes of UPFC?
Unified Power Flow Controller (UPFC) is used to control the power flow in the transmission systems by controlling the impedance, voltage magnitude and phase angle. This controller offers advantages in terms of static and dynamic operation of the power system.
What are the functions of the shunt converter in the UPFC?
The shunt compensator of the UPFC is normally used with two objectives. The first is to control the reactive power in the point of connection, and therefore controlling the voltage at this point. The second is to control active power in such a way as to control the dc link voltage.
What are the functions of series converter in the UPFC?
The main purpose of the series converter is to regulate the active and reactive power flow of the controlled line LS1, changing the receiving end voltage VS1 with the series voltage VC and therefore the current IS1 of the line.
What is the difference between UPFC and UPQC?
A UPFC is employed in a power transmission system to perform shunt and series compensation at the same time. Similarly a UPQC can also perform both the tasks in a power distribution system. A power distribution system, on the other hand, may contain unbalance, distortion and even dc components.
Why Statcom is used?
The Static Synchronous Compensator (STATCOM) is used in an HVDC system to provide reactive power compensation. It makes use of the Voltage Source Converter (VSC) to synthesize a controllable sinusoidal voltage at the fundamental frequency.
