Power Quality Enhancement with Wind Energy Coupled UPQC with Adaptive Controller

Abstract

With the diversified growth of power system, though there are many key issues which must be focused, addressing the power quality issues has become a pivotal role of an electrical engineer. Power quality issues are mainly concerned with maintaining the waveform and amplitude of the source voltage to the required reference level, mitigating the harmonics in the load current waveforms, etc., The resolving of power quality issues has been made feasible by the development of Power Electronics based devices. Though there are a wide range of controllers, Unified Power Quality Conditioner (UPQC) is a capable device used for the upgrading the quality of power due to its speedy response, high steadiness and little cost. A UPQC is used to compensate voltage sags, voltage swell and harmonics. It can protect sensitive loads against the voltage variations or disturbances. UPQC has two converters that are joined to a common DC link with an energy storage capacitor. In this paper, the proposed system consists of wind energy coupled UPQC being employed for power quality enhancement viz. Voltage sag, Voltage swell on the source voltage and current harmonics mitigation on the source current. Adaptive PI controller has been used for creation of reference signals for both shunt and series APFs and Park's transformation has been implemented for the control strategy which aids the adaptive PI controller. Both open loop and closed loop controller using adaptive PI controller have been studied in this paper and simulation results observed for the proposed system using MATLAB SIMULINK software also have been presented as sustenance for the control strategy proposed. Therefore, this paper aims at proposing a system with a control strategy that can give a fast and reliable wanted response during the operating condition of the system varies. It means, any change made in the external condition of the proposed system will not produce any abnormal effects. Consequently, an adaptive PI (A-PI) control based UPQC is used for voltage regulation and mitigation of current harmonics and the results have been presented.