SVG: Static Var Generator

ANHUI ZHONGDIAN ELECTRIC CO., LTD. static var generator is a static electrical device/equipment/system that draws controlled capacitive or inductive current from the electrical power system and thereby generates or absorbs reactive power. Permanently connected and switchable reactor and capacitor banks have been always used in AC power systems to ensure desirable voltages along transmission lines and to minimise voltage variations in the face of changing daily power demand.

By definition, capacitors generate and reactors absorb reactive power when connected to an AC power source and have been used with mechanical switches for coarsely controlled VAR generation or absorption since the early days of AC power transmission. To summarise:

• VAR generators can provide stepping variable shunt impedance by synchronously switching shunt capacitors/reactors”on”and “off “the grid, from maximum capacitive to the maximum inductive output at a given grid voltage.

At the heart of ZDDQ SVG is IGBT. The high switching frequency of the insulated gate bipolar transistor (IGBT) allows extremely fast control, which can be used in areas such as mitigation of voltage flicker caused by electric arc furnaces. Although circuit configurations and operating principles significantly differ, all controlled static VAR generators have fast response, freely repeatable VAR output control and virtually unlimited life. To summarise:

• Most continuous VAR control can be achieved by VAR generators based on semiconductor switching devices that provide a continuous variable shunt impedance from maximum capacitive to maximum inductive output at a given grid voltage.

1. 400V Static Var Generator
2. 480V Static Var Generator
3. 690V Static Var Generator
4. 6.6KV STATCOM
5. 11KV STATCOM
6. 35KV STTCOM