Power optimization and static performance investigation of an island-mode doubly-fed induction generator (DFIG)
This paper presents a performance investigation of power optimization by using a Proportional-Integral (PI) controller in a doubly-fed induction generator (DFIG). A detailed, dynamic model of a DFIG based on variable speed systems is presented in the dq-synchronous reference frame. Along with different controller types, a PI controller is chosen. Moreover, besides active and reactive power control, constraints and power optimization are discussed. Matlab software was used for simulation.
Active Use of DFIG-Based Variable-Speed Wind-Turbine for Voltage Regulation at a Remote Location
Renewable energy sources are presently exempted from control functions. This, in turn, simplifies the requirements for the renewable energy source interconnection as well as the project developer, allowing connection to the system without having to take part in the overall stabilization effort. Thus, in order to maintain the power generation and consumption balance, necessary for stable functioning of the power system, the traditional power plants always exert necessary control actions. However, the present practice requires the independent power producers and/or generators who want to connect to the grid to meet the so-called connection requirements of the local electric utility (the grid company). Therefore, this paper proposes an innovative reactive power control scheme for voltage regulation at a remote location that manipulates dynamically the reactive power from the voltage source converter (VSC) with taking into account its operating state and limits.
Study on terminal voltage and power factor control of induction generator for wind power generation system
This paper deals with the control of induction generator terminal voltage and power factor which they are controlled by adjusting reactive power using compensating capacitor. At first, the theoretical equations expressing induction generator terminal voltage and power factor are derived. Then, the compensating capacitor in terms of wind velocity is determined quantitatively. By using the proposed control method, it is confirmed that to be able to keep the terminal voltage and operating power factor of wind power generation system to a target value even in the case when the abrupt deviation of wind speed is caused. The validity of the proposed method is confirmed with MATLAB/SIMULINK simulations.