Siemens Energy has received an order worth EUR65 million from Saudi Arabia to supply three turnkey static reactive-power compensation systems. Siemens will supply three static Var compensators (SVCs) for different high-voltage levels to Saudi Electric Co. (SEC) for stabilization of the country’s 60-Hz power transmission network. The parallel compensation systems will be deployed at three sites in the Hiteen, Qassim and Afif substations and are scheduled to be ready for operation between mid-2011 and early 2012.

“We are pleased that our field-proven technology will be deployed to stabilize the Saudi power transmission network,“ said Udo Niehage, CEO of the Power Transmission Division of Siemens Energy. The three systems ordered are intended for the 380-kV, 132-kV and 33-kV voltage levels and will have a dynamic compensation capacity of as much as 800 MVAr.

Reactive-power compensation systems compensate voltage and load fluctuations in high-voltage transmission networks and thus ensure stable operation. As a result of the increasing power demand in Saudi Arabia the local grid will be exposed to higher loadings and this will make it necessary to implement additional measures for grid stabilization.

The thyristor valves of Siemens SVC systems are equipped with direct light-triggered thyristors, which ensure enhanced reliability. The control system for the SVC systems is based on Simatic TDC, the field-proven multiprocessor automation system, which is deployed in particular in large systems for process, energy and drive technology.

Static reactive-power compensators with dynamic control are part of FACTS (Flexible Alternating Current Transmission Systems) technology. Siemens’ FACTS systems control the parameters, which dictate the operation of a power supply network and thus the quality of power transmission.