Study on Harmonic Suppressions by optimization-based Three-Phase Three-Wire PV-APF

Abstract

With a large number of non-linear loads are integrated into the electric grids, they cause the significant power quality problems; meanwhile, harmonic is one of the problems that be paid more concerns, and it is necessary to seek useful ways for suppressions. Nowadays, solar PV power generations become one of the main streams among various renewable energy. Under the applicable control design, PV power not only can provide general power generation but also can used for power quality improvement. This paper thus mainly focuses on the study of harmonic suppression on low-voltage system by three-phase three-wire PV-APF system. For the proposed PV-APF system, it consists of: dual second order generalized integrator-phase-locked loop design for exact harmonic detection, self-tuning synchronous reference frame method for the calculation of harmonic compensation currents, a multi-mode strategy for the PV-APF to operate in different modes, and a bat-optimization PI controller for the better PV-APF control. MATLAB/Simulink is used for modeling and testing in this paper. Performance of proposed PV-APF design is finally be well validated by different load scenarios.