APPARATUS FOR DELAY ANGLE COMPENSATION OF FLYING START FUNCTION

摘要

An apparatus for delay angle compensation for flying start function in a medium-voltage inverter is disclosed. The apparatus generates generate a phase angle (θ) by converting a three-phase voltage of an inverter output terminal to dq-axis voltages (Vd, Vq), and calculate a compensation phase angle by a predetermined delay time. In addition, the apparatus generates an initial angle for the flying start by aggregating the compensation phase angle with the phase angle (θ). The apparatus may drive a high-voltage motor more stably, because an error between a command voltage phase angle and an actual output voltage phase angle may be reduced, when electric power of the medium voltage inverter is restored after a trip or an instantaneous blackout occurs.

主权项

1. An apparatus for delay angle compensation for flying start function in a medium-voltage inverter, the apparatus comprising:
a signal processing unit configured, by converting a three-phase voltage of an inverter output terminal to a two-phase stationary reference frame voltage (Vαβ), to generate an AC signal V′ corresponding to a frequency applied by the inverter and an AC signal qV′ having a phase angle delayed by 90 degrees to the V′, and to generate a reference frequency (ω′) for phase angle compensation; a phase generating unit configured to convert the V′ and the qV′ signals to dq-axis voltages (Vd, Vq) through a rotary coordinate conversion, and to generate a phase angle (θ) using the Vq; and a phase compensating unit configured to calculate a compensation phase angle by multiplying the reference frequency (ω′) generated from the signal processing unit by a predetermined delay time, and to generate an initial angle for the flying start by aggregating the compensation phase angle with the phase angle (θ) generated from the phase generating unit.