Using Complex Adaline for the Direct Symmetrical Components Estimation

Increasing presence of non-linear and unbalance loads in electrical networks leads to severely distorted and unbalance voltage/current signals. Accordingly, the estimation of amplitudes and phase angles of symmetrical components are required in many power system applications, e.g. digital protection and power quality monitoring. We propose a complex Adaline based approach for fast and accurate sequences estimation. In this approach, three-phase signals are firstly simplified to a complex signal through the alphabeta transformation. Then, the transformed complex signal is fed to a complex Adaline processing unit to estimate embedded positive and negative sequences. This method directly estimates sequences of all individual harmonic components with low computational burden and high estimation speed, which is requested for on-line hardware implementation. Finally, two comparative case studies are conducted on the MATLAB and PSCAD/EMTDC to investigate the proposed method performance and compare it with another successful method, multi-output Adaline.