This paper presents the modelling and simulation of wind farm driven by doubly-fed induction generator (DFIG) which feeds alternating current (AC) power to the utility grid. Here, two pulse width modulated voltage source converters are connected back to back between the rotor terminals and utility grid via common direct current (DC) link. The grid side converter controls the power flow between the DC bus and the AC side. It allows the system to be operated in sub-synchronous and super synchronous mode of operation. The machine side converter provided the proper rotor excitation needed. The complete system is modelled and simulated in the MATLAB Simulink environment. The modelling was done in such a way that it can be suited for modelling of all types of induction generator configurations. Using dynamic vector approach for machine model, the model makes use of rotor reference frame. The results of the simulations showed that the voltage stability of the system was improved by 66.7% using the DFIG wind turbines. This is through their ability to control reactive power and decouple control of active and reactive power by independently controlling the rotor excitation current. It was observed that the system voltage was increased from 0.99p.u to 1.01p.u.
Doubly-fed Induction Generator, Wind Farm, Pulse Width Modulation Converter, Voltage Sag, Reactive Power
Nweke Ugochukwu C. , Ezechukwu O. A. , Aneke Jude I. "Modelling and Simulation of Wind Farm for Voltage Regulation of a Mind-grid" Iconic Research And Engineering Journals Volume 5 Issue 3 2021 Page 20-26
Nweke Ugochukwu C. , Ezechukwu O. A. , Aneke Jude I. "Modelling and Simulation of Wind Farm for Voltage Regulation of a Mind-grid" Iconic Research And Engineering Journals, 5(3)