Unified Power Flow Controller (UPFC) is the most advanced FACTS solution which provides independent active power and reactive power control of the transmission system. The UPFC is a combination of static synchronous compensator (STATCOM) and a static synchronous series compensator (SSSC) coupled via a common DC voltage link.
Due to the dynamic and flexible control in both active and reactive power UPFC can bring a bunch of benefits to power transmission system:
Flexible power flow control
Dynamic voltage regulation
Improved system stability
Power oscillation damping
Regulation of loop current in meshed network to achieve optimal load flow
Increase of transmission capacity of existing network and avoid installation of new lines
UPFC solution from NR is based on state-of-art MMC converter. Through connection of sub-modules in series power regulation at various high voltage levels is achieved according to system requirement.
MMC converter with high flexibility
Redundant sub-modules to ensure high availability
Low converter losses
No filters required
The first MMC based UPFC in the world was successfully put into service in 220 kV grid of Nanjing city on Dec.11th, 2015 by NR Electric. NR Electric is responsible for the total solution covering system study, basic design and detailed design, manufacturing and procurement, installation, commissioning. The successful operation of UPFC marks that NR Electric has completely owned the capability of designing, supplying, manufacturing and commissioning of UPFC as a turnkey solution provider.
Consulting and System Planning
Conceptual & Detailed Design
Manufacturing & Testing
Engineering & Procurement
Site construction, installation
Onsite Testing & Commissioning
Operation and maintenance services