Wound Rotor Induction Generator With Sensorless Control and Integrated Active Filter for Feeding Nonlinear Loads in a Stand-Alone Grid

Abstract

Rq q-axis rotor voltage. u fed d-axis line side converter reference voltage. u feq q-axis line side converter reference voltage. ω mS Stator frequency. ω S Stator frequency. U S Stator voltage. U ac Grid voltage. U dc DC link voltage. i dc DC link current. i L DC link load current. i Ld d-axis nonlinear load current. i Lq q-axis nonlinear load current. i Ldh d-axis harmonic components of load current. i Lqh q-axis harmonic components of load current. ε Angle between stationary axis and rotor axis. µ Angle between stationary axis and stator flux axis. θ Angle between stationary axis and stator voltage axis.

Modelling and Simulation of An Isolated Power Generating System Using Doubly Fed Induction Generators

“…[2].For the stator side converter, an indirect current control scheme is applied. As the control operation is based on switching, that needs control signals for converter operation.…”

“…In simple terms, a stand-alone generator refers to an isolated grid feeding a local load [2]. In the case of gridconnected variable-speed wind turbines, the total active power can be fed to the grid.…”

“…On the other hand, in the case of stand-alone systems, the voltage and frequency control issues have been mentioned by some researchers. Some experimental work has also been reported for stand-alone systems using DFIG [2], [8], [9]. The stand-alone generation systems with hybrid topology of wind-diesel have also been reported in the literature [10], [11], [18].…”

Analysis and modeling of standalone wind driven doubly fed induction generator

“…The accurate knowledge of the generator rotor position is required to estimate the suitable value of the current flowing in the rotor terminal. Further, in [15] the rotor position estimation technique is presented for the nonlinear loads. The rotor position or speed estimation techniques are more advantageous in compare to methods based on using the sensors due to less maintenance, reliable and cost effective solution [16]- [20].…”

Modeling and Designing a Deadbeat Power Control for Doubly-Fed Induction Generator

“…The stator of DFIG is directly connected to the grid and the rotor is connected to the grid by a bi-directional converter as shown in Figure 1. The converter connected to the rotor controls the active and the reactive power between the stator of the DFIG and ac supply or a stand-alone grid (Jain & Ranganathan, 2008). The control of the wind turbine systems is traditionally based on either stator-flux-oriented (Chowdhury & Chellapilla, 2006) or stator-voltage-oriented (Hopfensperger et al, 2000) vector control.…”