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Unified Power Flow Controller (UPFC)
Description: 

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 is a versatile controller which can be used to control active and reactive power flows in a transmission line. The concept of UPFC makes it possible to handle practically all power flow control and transmission line compensation problems, using solid state controllers, which provide functional flexibility, generally not attainable by conventional thyristor controlled systems.
The UPFC is a combination of a static synchronous compensator (STATCOM) and a static synchronous series compensator (SSC) coupled via a common DC voltage link. It is capable of controlling simultaneously or selectively, all the parameters affecting the power flow in a transmission line. The parameters usually are voltage, impedance and phase angle.

Applications: 

UPFCs find applications in the following areas:
- Control of power flow
- Reactive power compensation
- Elimination or reduction of over load conditions
- Improve power system stability

References: 

[1] NETL, Smart Grid Technologies. URL: http://www.netl.doe.gov/smartgrid/referenceshelf/whitepapers/Compendium_of_Technologies_APPROVED_2009_08_18.pdf
[2] IEEE. URL: http:// ieeexplore.ieee.org/iel3/61/9038/00400878.pdf

Key Technology Area: 
Advanced Components

Sample Vendors:
Name Product description Submitted on Submitted by Affiliation Contact information
ABB 09/30/10
Schneider Electric 09/30/10
Siemens 09/30/10

 

(Disclaimer: This is a representative sample list of vendors which is updated frequently. The SGIC portal does not endorse any companies or products listed herein.)