The invention relates to a power supplying circuit and a power supplying method for chain-type SVG (
static var generator) modules. The power supplying circuit comprises a constant alternating-current
control power supply and a plurality of current sensing receiving circuits, and each current sensing receiving circuit consists of a
ferrite bead and a coil. An output terminal of the constant alternating-current
control power supply is connected with a high-
voltage cable, and the high-
voltage cable is penetratingly arranged in the ferrite beads of the current sensing receiving circuits to connect the ferrite beads in series structure. Each input terminal of the SVG modules is respectively connected with each output terminal of the current sensing receiving circuits, and the ferrite beads are located outside the SVG modules. The constant alternating-current
control power supply comprises a semi-controlled
rectifier bridge, an
inductor, a direct-current
capacitor and a phase-shifting and
voltage-regulating
inverter bridge. Alternating-current utility power is rectified to direct-
current voltage containing
ripple components through the semi-controlled
rectifier bridge, and current surge is reduced via the
inductor, the
ripple components in the direct-
current voltage are restrained by the direct-current
capacitor parallelly connected between two output terminals of the semi-controlled
rectifier bridge, and then the alternating-current utility power is inputted into the phase-shifting and voltage-regulating
inverter bridge. The power supplying circuit and the power supplying method for the chain-type SVG (
static var generator) modules can be widely applied to the field of high-voltage reactive
power compensation.