Improvement of Power Quality in Wind Farm Integrated With Weak Grid Using Fuzzy Logic Based UPQC

This paper mainly deals with the regulation of voltage at wind farm (WF) terminals and the improvement of power quality and maintenance of WF stability in a WF integrated with Weak-Grid. Generally in modern power systems, the WF is connected through medium voltage (MV) distribution lines. This type of integration results in poor voltage regulation at the point of common coupling (PCC). Thus, the combination of weak grids, wind power fluctuation and system load changes produce disturbances in the PCC voltage, worsening the Power Quality and WF stability. This situation can be improved using Custom power devices technology (CUPS), the Unified Power Quality Compensator (UPQC). The internal control strategy is based on the management of active and reactive power in the series and shunt converters of the UPQC, and the exchange of power between converters through UPQC DC–Link. In the proposed paper total harmonic distortion (THD) is determined using FUZZY controller and the results are compared with those obtained using PI controller. Simulations results show the effectiveness of the proposed compensation strategy in reducing the THD value there by enhancing Power Quality and Wind Farm stability.