Positive and Negative Sequence based Sensorless Control for Stand-Alone Slip-Ring Generator

Iwański, Grzegorz; Koczara, W.

doi:10.1109/epepemc.2006.4778458

Cited by 5 publications

(2 citation statements)

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“…Also, these systems are not being used for the isolated or remote areas because of absence of utility grid [15]. Some researcher has tried to make the conventional DFIM based system utilizable in isolated or remote areas even in the absence of utility grid [15][16][17][18][19]. In these isolated or autonomous DFIM based systems, the main issue, which must be addressed, is the regulation of stator/load voltage and frequency control [20].…”

Section: Introductionmentioning

confidence: 99%

“…In these isolated or autonomous DFIM based systems, the main issue, which must be addressed, is the regulation of stator/load voltage and frequency control [20]. A direct voltage control method was proposed in [15][16][17][18][19] which are dependent on the load characteristics. An instantaneous direct voltage and frequency control technique was presented, applicable for both balance and unbalance loads, in [21] which is just an improvement of the direct voltage control.…”

Section: Introductionmentioning

confidence: 99%

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Untitled

2019

Int J Electron Device Phys

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This paper presents the performance analysis of an autonomous DFIG based wind energy generation system under the different possible conditions. A variable speed-constant frequency wind energy generation system, supplying an isolated load, is designed via wound rotor induction machine and back-to-back coupled power electronics converters, connected in between stator and rotor of machine. Indirect stator flux-oriented control technique is used towards rotor side converter for regulating the voltage and frequency at the stator terminal. In order to provide the load harmonic compensation, shunt active power filtering function is embedded in the control of the stator/load side converter control. Hysteresis controllers are used for providing control pulses for both the converters. These control pulses achieved through generated error signals, by comparing the actual and reference rotor current. The simulation of 2 MVA wind energy generation systems is done through wound rotor induction machine prototype in MATLAB/Simulink. The simulation results obtained from the 2 MVA systems are observed and analysed in this paper.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Untitled

2019

Int J Electron Device Phys

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Autonomous power system for island or grid‐connected wind turbines in distributed generation

Iwański

Koczara

2008

Int Trans Elec Energy Syst

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SUMMARYModern power generation systems for wind turbines are often based on the rotor fed slip-ring machines. Power electronics converter provides the slip power, and also the reactive power for excitation of the generator during standalone operation. This way the isolated load can be supplied even if the grid has failed. Stator voltage in an autonomous operation is controlled using vectorial phase locked loop (PLL) structure; therefore the information about mechanical speed or angular position of the rotor is eliminated from the control method. The second PLL is also used for synchronization of the generated voltage with the grid voltage. Voltages synchronization is necessary for soft connection and protection of the supplied load from the rapid change of the supply voltage phase. The grid-connected doubly fed induction generator (DFIG) can be useful after grid fault; however, the mains outage detection methods are necessary for fast disconnection after grid failures.

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