Power Quality Enhancement in a Wind Farm Connected Grid with a Fuzzy-based STATCOM

Abstract

Integrating wind farms with electricity transmission networks presents several problems, and power quality plays a vital role among these. This study proposed a novel fuzzy logic controller to reduce the effect of power quality issues in such applications and investigated two different FACTS (Flexible AC Transmission System) devices, the Static Var Compensator (SVC) and the Static Synchronous Compensator (STATCOM). The fuzzy logic controller was designed as a voltage controller to improve power quality. Detailed analysis was carried out to investigate the successful mitigation of voltage sag/swell, active and reactive power improvement, and voltage flickers control by two controllers in a Multi-Terminal Load (MTL) system consisting of wind generators. The results were verified in MATLAB simulations, and a comparison was performed between the proposed shunt controllers. Furthermore, the design of a fuzzy interference system based on Vref (reference voltage) and the voltage measured at STATCOM location signals was investigated and compared with the SVC in terms of voltage sag, voltage swell, voltage flickers, and Total Harmonic Distortions (THD). The proposed fuzzy system was compared with a PI-based STATCOM and SVC. The power quality issues were exacerbated when using Multi-Terminal Load (MTL) in the transmission network.

Voltage Control of a Three-Phase Distribution Grid using a DC Microgrid-Fed STATCOM

“…In [14], a STATCOM is designed to improve the lowvoltage ride-through capability of grid-connected induction machines following grid faults by controlling the reference voltage, thereby limiting the maximum torque of the induction motor. A comparison between SVC and STATCOM was carried out in [15], while the applications of STATCOM for power quality improvement of grid-connected wind farms were described in [16,17]. In [18], a PID controller with an adaptive switched filter capacitor and a modified D-STATCOM were proposed.…”

Investigations on Confederated Unified Power Quality Conditioner with Three-Phase Photovoltaic System

“…The UPQC is a member of the APF family that integrates the shunt and series APF features in order to gain greater control over many power quality issues all at the same time [16,17]. On the utility side, an active filter is utilized to alleviate these problems [18]. The harmonics of active filters change over time.…”