Low Voltage Static Var Generator (SVG)

タイトルまたは説明

SVG is the representative of latest technology in the present reactive power compensation field. SVG is connected
to the power grid, acting as a variable reactive current source. Its reactive current may rapidly track variation of
load reactive current and automatically compensate reactive power required by the system. Because SVG
responds very fast, it's also called static synchronous compensator (short for STATCOM).
Basic principle of static var generator: connect the auto phase commutating bridge circuit to the power grid via
reactor, properly regulate phase and amplitude of output voltage in the AC side of bridge circuit or directly control
current in the AC side so that the circuit may absorb or generate the compliance reactive current to realize reactive
compensation in a dynamic manner. In the meantime, it can inhibit voltage flicker, keep it stable, track and
compensate harmonic current, absorb several low order harmonics of power distribution system and balance
inter-phase reactive power.
The low-voltage static var generator (SVG) is mainly composed of controller, isolation switch (circuit breaker),
contactor, IGBT Bridge, drive circuit, protection system, connecting electric reactor, DC capacitance, etc. The
controller detects phase A, C (phase A, B, C of three phase four wire system) reactive power (current), produces
control signal, drive on/off of IGBT, generates reactive current as per requirement so that the system power factor
constantly approaches