Patent ID: 6628014
Filing Date: 2003-09-30
Classification: H02J,H02M,Y02E

Abstract:
A method of compensating voltage drop in a multi-conductor cable (3) connecting an electric power source (1) with a consumer installation (4) demanding supply of multi-phase AC power of a predetermined frequency and nominal voltage, in particular for supply of ground power to aircraft standing in airport parking positions, comprising adjustment of the output voltage of the electric power source to a level above said nominal voltage and further comprising the steps ofa) determining a set of cable impedance parameters, e) storing said set of cable impedance parameters in the form of a cable model matrix in a memory (202) forming part of a voltage drop compensation control circuit (2) in the power source (1), f) determining vector representations of the fundamental components of the individual output currents of the phases of the multi-phase AC power, g) calculating for the phases of the multi-phase AC power a set of vector representations of fundamental voltage drop signals by matrix multiplication of the vector representations of said fundamental current components by said cable model matrix, and h) using the vector representations of said fundamental voltage drop signals as reference signals for a voltage controller (13) in said power source (1) to produce for each of said phases a compensation voltage for addition to said nominal voltage.