Compensation of cable voltage drops and automatic identification of cable parameters in Ground Power Units

In this paper, a new cable voltage drop compensation scheme for ground power units is presented. The scheme is able to predict and compensate the voltage drop in an output cable by measuring the current quantities at the source. The prediction is based on an advanced cable model that includes self and mutual impedance parameters. The model predicts the voltage drop at both symmetrical and unbalanced loads. In order to determine the cable model parameters an automatic identification concept is derived. The concept is tested in full scale on a 90 kVA, 400 Hz Ground Power Unit with an output cable of 100 m. It is concluded that the performance is significant improved both with symmetrical and unsymmetrical cables and with balanced and unbalanced loads.