Monitoring and unbalance mitigation of harmonic current symmetrical components, using double Complex-ADALINE algorithm

Harmonics tracking as well as symmetrical components identification are of the great importance in Power Quality (PQ) evaluation and improvement. In this paper, a new approach for fast and accurate estimation of fundamental and harmonic symmetrical components is presented. Firstly, the three-phase input signals are simplified into a real-imaginary system using Park vector. Then, the resulted signal is fed to a Complex-ADALINE (C-ADALINE) structure for the estimation of symmetrical components of both fundamental and harmonics of the input. Also, zero sequences of the harmonics are extracted by another C-ADALINE unit. For simplicity, both of the C-ADALINE structures are organized in one computational system, which is called Double C-ADALINE. Finally, two case studies are conducted on MATLAB software package to investigate the performance of the suggested technique and compare it with conventional ADALINE. The simulation results indicate that the proposed system shows an excellent performance in monitoring the harmonics and symmetrical components in condition of dynamic changes of artificial three-phase signals, as well as control strategy in a D-STATCOM to harmonic cancellation, unbalance mitigation and reactive power compensation in a test distribution network.