Sensorless Voltage Control Schemes for Brushless Doubly-Fed Induction Generators in Stand-Alone and Grid-Connected Applications

Self Cite

Variable speed generator systems (VSGs) are at work in the now 600 GW installed wind power plants (parks). Also, they are used as vehicular and on ground stand-alone generators. VSGs imply full kVA rating PWM converters in permanent magnet (PM) or in electrically excited synchronous or in cage rotor inductance generators. But, to reduce cost in absence of PMs at a reasonable initial cost (weight) and efficiency, the fractional kVA PWM converter doubly fed induction generators (DFIG) cover now about 50% of all installed power in wind generators. The present paper reviews recent progress in DFIG and various forms of brushless DFGs (doubly fed generators) characterized in terms of topology, design, performance and advanced control for healthy and faulty load conditions in the hope of inspiring new, hopefully ground breakings, progress for wind and hydro energy conversion and in vehicular and on the ground stand-alone generator applications.INDEX TERMS Variable speed generator system, double fed induction generator, brushless double fed induction (reluctance) generator, dual stator winding cage rotor induction generator, dual rotor bidirectional flux-modulation permanent magnet machine.

Section: A Rotor Position/speed Observersmentioning

confidence: 98%

“…A simplified approach for the rotor-position observer (RPO) of BDFIGs has been proposed and investigated in [39], [40] with a direct estimation principle without any PI controllers or integral components as shown in Fig. 10.…”

Section: A Rotor Position/speed Observersmentioning

confidence: 99%

Fractional kVA Rating PWM Converter Doubly Fed Variable Speed Electric Generator Systems: An Overview in 2020

Boldea

Tutelea

et al. 2021

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“…In [86] and [87], the proposed approach needs the knowledge of the PW flux, and the PW and CW currents. In order to eliminate the integration process for calculating the PW flux, the dq-axis PW flux is calculated at first and then transformed to the αβ-axis quantities.…”

Section: ) Direct Calculation Approachesmentioning

confidence: 99%

“…28. Flowchart of the direct calculation approach for BDFIG rotor position as developed in [86] and [87].…”

Section: ψ1dqmentioning

confidence: 99%

Recent Advances of Control Technologies for Brushless Doubly-Fed Generators

Liu

Hussien

Shao³

et al. 2021

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The brushless doubly-fed generator (BDFG) is a kind of dual-electrical-port field-modulated electrical machine containing two sets of stator windings with different pole pairs. The stator power winding undertakes most of the power inflow and outflow, and the stator control winding connected to the power converter can be utilized to regulate the machine operation status. Consequently, the rotor no longer needs to be supplied by the power converter, so that the brushes and slip rings can be removed. The BDFG can be used for grid-connected power generation as well as standalone power generation. This paper reviews recent advances of control technologies for BDFGs under different operation conditions, e.g., gridconnected ac power generation with normal and faulty grids, standalone ac power generation with normal and special loads, and dc power generation. The progresses of sensorless control technologies for BDFGbased power generation systems are also discussed. The classification and comparison are carried out to discover the similarities and differences between theses control technologies. This paper is in the hope of inspiring new, ground breakings and progresses for high-performance BDFG power generator applications.

“…Due to the absence of brushes and slip rings, the brushless doubly-fed induction generator (BDFIG) has advantages of high reliability and low maintenance cost [1]- [4]. Moreover, compared to conventional slip-ring doublyfed induction generator (DFIG), BDFIG also has many other advantages such as smaller mechanical gearbox and better low voltage ride through (LVRT) capability [5]- [9].…”

Section: Introductionmentioning

confidence: 99%

Modeling and Coordinated Control Design for Brushless Doubly-Fed Induction Generator-Based Wind Turbine to Withstand Grid Voltage Unbalance

Zhu

Kang

2021

Grid codes require wind turbines to have capability to withstand a certain grid voltage unbalance without tripping. However, existing controls for brushless doubly-fed induction generator (BDFIG) based wind turbine under grid unbalance have many problems such as difficulty in realizing decoupling control, involvement with flux or current estimations, and complex control structure. Moreover, the existing studies only focused on the control of machine side converter (MSC), but the coordinated This work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.