Direct Voltage Control of a Doubly Fed Induction Generator by Means of Optimal Strategy

Abstract

The major objective of the investigation reported in this article is to demonstrate the feasibility of controlling a Doubly Fed Induction Generator actuating directly on the rotor voltage produced by the Rotor Side Converter, as its reference value may be determined analytically, after definition of the control objective. Two usual objectives are here considered: maximum power extraction from wind (MPPT) and stator reactive power equal to zero. This last objective defines the reference slip to be considered in the formulation of developed power that, jointly with the reactive power equation, forms the system to calculate the rotor reference voltages. The process is completed by specifying the desired dynamical response. Thus, the angular velocity of the rotor should quickly reach its reference value, which requires maximal power acceleration at the beginning, but respects the restriction that no overshoot should be allowed. This is achieved by means of a constrained optimization process solved in real time. Following recent trends, only measurements obtained from stator (voltages and currents) sensors are used. This way, angular velocity and rotor currents are estimated in real time. An algorithm for inductance estimation is also included, which prevents deviations of nominal values that could lead to false reference voltages.

Model‐assisted active disturbance rejection controller for maximum efficiency schemes of DFIG ‐based wind turbines

“…In addition, in DFIG‐WTs, the magnetizing inductance has the highest value, compared to the other DFIG parameters, so it is important to identify its value properly to ensure control efficiency 23 . Furthermore, according to the voltage applied to the stator, the magnetizing inductance can have different values depending on the saturation level of the DFIG.…”

Double Fed Induction Generator Control Design Based on a Fuzzy Logic Controller for an Oscillating Water Column System

“…A back-to-back converter was established using a rotor side converter (RSC) and a grid side converter (GSC). The GSC preserves constant voltage of the DC-link and regulates the reactive output power, which implies that this device allows the power flow between rotor to stator [38]. The rotor side converter (RSC) objective is to repel fluctuations that may affect the torque and stator reactive power [39].…”

The Validation and Implementation of the Second-Order Adaptive Fuzzy Logic Controller of a Double-Fed Induction Generator in an Oscillating Water Column

“…Reactive power control is one of the GSC functions used to maintain the unity power factor. For the OWCPP to operate as smoothly as possible, the DC link voltage level is also set to a constant level [10][11][12][13]. Six controllers will be required by the RSC and GSC to carry out these duties.…”