POWER FLOW CONTROLLER WITH A FRACTIONALLY RATED BACK-TO-BACK CONVERTER

摘要

A power flow controller with a fractionally rated back-to-back (BTB) converter is provided. The power flow controller provide dynamic control of both active and reactive power of a power system. The power flow controller inserts a voltage with controllable magnitude and phase between two AC sources at the same frequency; thereby effecting control of active and reactive power flows between the two AC sources. A transformer may be augmented with a fractionally rated bi-directional Back to Back (B TB) converter. The fractionally rated BTB converter comprises a transformer side converter (TSC), a direct-current (DC) link, and a line side converter (LSC). By controlling the switches of the BTB converter, the effective phase angle between the two AC source voltages may be regulated, and the amplitude of the voltage inserted by the power flow controller may be adjusted with respect to the AC source voltages.

主权项

1. An apparatus for controlling real and reactive power flow between a first AC source and a second AC source, comprising:
a back-to-back converter comprising
an AC-DC converter coupled between a first tap and a second tap of a transformer, the AC-DC converter comprising a first set of switches,a DC-AC converter coupled to the second AC source, the DC-AC converter comprising a second set of switches, anda DC link coupled to the AC-DC converter and the DC-AC converter, wherein a third tap of the transformer is coupled to the first AC source, and an input voltage to the back-to-back converter is less than a voltage at the third tap of the transformer.