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High-voltage Static VAR Compensator (SVC)
High-voltage Static VAR Compensator is a typical Flexible AC transmission device. When applied in power transmission systems, it increases transmission capacity, stabilizes system voltage, damps low frequency oscillations and suppresses sub synchronous oscillations. When used in industrial power distribution networks, such as electrified railways, metallurgical and other industrial users, SVC can lower voltage fluctuations, flickering, negative sequences and harmonics which are caused by nonlinear and impact loads, and in the meantime improve power quality, effectively enhance users’ production efficiency, increase load power factors, reduce reactive power flow and cut network losses.
Device functions
Functions of SVC in transmission grids
Significantly increase transmission capacity
Improve system stability
Enhance damping and low frequency oscillation suppression
Reduce sub-synchronous resonance
Achieve continuous, dynamic and precise system voltage regulation
Reduce network losses
Functions of SVC in industrial distribution networks
Increase the power factor
Reduce network losses
Suppression of harmonic interference caused by a nonlinear load
3-phase load balancing
Reduce negative sequence, voltage fluctuations and flicker
Improve power quality
Improve production efficiency
Functions of SVC in wind farms
Increase system stability
Suppress voltage fluctuations
Enhance damping and low frequency oscillation suppression
Technical features
DSP-based fully digital control system, fast dynamic response, high controlling accuracy
Using optical trigger and producing energy under high voltage from a high potential board, and with BOD thyristor protection, the system has strong anti-jamming capabilities
With horizontal thyristor valve design, the equipment is compact, reliable and requires less maintenance
Thyristor valve uses components and water cooler from well-known foreign companies
Closed pure water cooling system is adopted, providing a high cooling efficiency and more reliability in operation
The monitoring system is in an integrated workstation which provides a user-friendly human machine interface (HMI)
Flexible control modes; a variety of control modes can be achieved, such as three-phase simultaneous control, split phase control and balanced three-phase control
Multifunctional automation interface; remote operation and automation system interface functions can be achieved, thus system allows to be unattended
Dual-redundant digital protection: the system includes a fast failure lockout device in addition to back-up computer protection;
Modular design, which is able to offer integrated constructions to devices ranging from several megabytes to several hundred megabytes
All outdoor layout
In order to reduce the installation area and to be mobile and flexible, the movable SVC (RSVC) with its compact layout can be used