Voltage Stability Improvement in a Weak Distribution System by Integrating the Wind Power Using UPQC

At present, it is very common to find renewable energy resources, especially wind power, connected to distribution systems, but this also bring new integration related power quality issues, which mainly consist of voltage regulation and reactive power compensation. Induction machines are used in wind power based generations. Induction generators draw reactive power from the system. Therefore, voltage control and reactive power compensation in a weak distribution networks for integration of wind power represent main concern of this paper. The problem is viewed from MATLAB/Simulink simulation of weak distribution network and wind power integration. UPQC is used at a point of interconnection of wind farm and the network; the system absorbs the generated wind power while maintaining its voltage level. UPQC is one of the best devices which are used for power quality improvement in power networks. The UPQC, which has two inverters that share one DC link capacitor, can compensate the power flow and improve the voltage stability.