Design and Analysis of a Novel Grid-Connected to Rotor Type Doubly Fed Induction Machine

Evaluation of a single‐phase 50‐Hz axial rotary transformer for DFIG systems

“…The standard DFIG topology consists of a grid‐tied stator and a rotor circuit controlled through a back‐to‐back converter. The alternative rotor‐tied configuration was first proposed by You et al . In this case, the rotor is connected directly to the grid and the stator is coupled via a converter as shown by Fig.…”

Improved efficiency of DFIG wind energy conversion systems by operating in the rotor-tied configuration

“…For all operating points, the rotor reactive power command is Q * r = 0 VAR and the electromagnetic torque command, T * e , varies with rotor speed according to (1), except that it is positive valued. A diagram of the rotor-tied DFIG controller is shown in Fig.…”

“…The rotor-tied DFIG concept was proposed by You et al [1], where it was concluded that the physical size of the machine can be reduced when designed specifically for rotor-tied operation. The steady-state operation of a rotor-tied DFIG was recently studied in the context of a variable-speed wind energy conversion system [2].…”

The doubly-fed induction generator in the rotor-tied configuration

“…Here, we consider reversing the connections so that the rotor windings are connected directly to the grid, whereas the stator windings are interfaced through the power converter. This idea was recently proposed by You et al [11], where it was concluded that the physical size of the machine can be reduced when designed specifically for rotor-tied operation. This configuration is analyzed in the steady state, in the context of a variable-speed wind energy conversion system.…”

“…As a means to improve the energy conversion efficiency of the machine, we consider reversing the connections so that the rotor windings are connected directly to the grid, whereas This idea was recently proposed by You et al [11], where it was concluded that the physical size of the machine can be reduced when designed specifically for rotor-tied operation. Steadystate operation of such a DFIG was studied in the context of a variable-speed wind energy conversion system in [16].…”