Fault mitigation through multi converter UPQC with hysteresis controller in grid connected wind system

摘要

The ability of parallel compensation for voltage and current in bus system is known as Multi Converter Unified Power Quality Conditioner (MC-UPQC). It improve the Power Quality (PQ) of the renewable energy sources. The combination of current and voltage quality is known as PQ. The PQ problems, named as imbalance, flicker, and harmonics, the electronically switched and nonlinear devices with increasing applications in distribution systems and industries have become serious concerns. In this paper, improved fuzzy-based MC-UPQC is proposed for improving the PQ in grid connected wind energy system (WES). Improved fuzzy, that is hybrid fuzzy incremental conductance controlled MC-UPQC is the novelty in this study. Fuzzy incremental conductance is introduced to search the maximum power point in wind energy conversion system. From the grid, the proposed controller joined with MC-UPQC improve the WES. At the same time, the system can recompense the current and voltage imperfections in adjacent feeders. A normal dc-link capacitor is shared by all converters in this configuration. Hence, the power transfer from one to adjacent feeders is possible. The proposed work is simulated in MATLAB/SIMULINK platform. Through the hysteresis controller, the performance analysis is carried out. Finally the results are compared with existing controller's namely proportional integral and a conventional fuzzy logic controller. Thus, the overall performance can display the effectiveness of the proposed approach. Compared to other two existing approaches, the proposed scheme achieves very low THD values i.e. 3.53% for load 1 and 3.25% for load 2.