Sensorless Direct Voltage Control of the Stand-Alone Slip-Ring Induction Generator

Iwański, Grzegorz; Koczara, W.

doi:10.1109/tie.2007.892746

Cited by 105 publications

(50 citation statements)

References 4 publications

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“…Recently, the control methods, that are developed for power electronics energy conversion systems are oriented to unbalanced grid connection operation (Abad et al, 2010;Iwanski and Koczara, 2007;Santos-Martin et al, 2008). Typical control strategy presented in publications provides sinusoidal currents (Figure 1), which are in phase with positive sequence component of grid voltage (Nagliero et al, 2009).…”

Section: Standard Control Strategymentioning

confidence: 99%

Control of grid inverter based on opposite vectors hodographs

Drązikowski

Iwański

2011

COMPEL

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PurposeThis paper presents control strategy of VSC connected to the unbalanced grid in stationary coordinates system. The algorithm shown in the paper can be applied to typical inverter to reduce or even eliminate oscillation of DC‐link voltage under unbalanced operation. That has a direct influence on constant flow of p component of power which is essential for drives system for reducing torque ripples.Design/methodology/approachThe presented strategy of control assumes that orientation of grid voltage and line current vectors hodographs have to be opposite. Mathematical analysis and simulation has been done. Laboratory tests on low power has also been carried out.FindingsThis method leads to fixed p component of power flow and fixed DC bus voltage. The presented idea of control may cause reduction of voltages asymmetry in three‐phase network with significant impedance (local grid, microgrid, isolated grid).Research limitations/implicationsFor 50 Hz power system, the presented control strategy has at least 5 ms response time because calculations are based on current and 5 ms delayed values of grid voltage. The paper presents only a simple steady state laboratory test that has been done in low scale of voltage and current.Practical implicationsThe paper shows an example of implementation of the method with simple dead‐beat current controller based on DSP microprocessor. The algorithm can be easy applied in a DC/AC converter for elimination DC‐link oscillations under unbalanced working conditions.Originality/valueControl methods presented in many other papers always provide sinusoidal, symmetrical three‐phase currents irrespective of grid voltage symmetry. The presented idea of control causes reduction of DC‐Link voltage and p, q components of power oscillations due to grid voltage asymmetry.

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Section: Standard Control Strategymentioning

confidence: 99%

Control of grid inverter based on opposite vectors hodographs

Drązikowski

Iwański

2011

COMPEL

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“…The step response method is used for the controllers tuning. Figure 7 presents the rotor current response to step The extended sensorless method of the stator voltage control uses the negative sequence components for the correction of the voltage asymmetry in four-wire DFIG power generation system dedicated to the unbalanced load supply [11,12]. …”

Section: Output Voltage Control Of Standalone Dfigmentioning

confidence: 99%

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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“…Such techniques are generally based on the magnetic saliency of the rotor. They have been proposed for induction motors [1], [2], or induction generators [3], [4], as well as for synchronous machines of different type [5], [6]. Sometimes, the magnetic saliency is artificially added to the rotor in order to increase the self-sensing capability [7].…”

Section: Introductionmentioning

confidence: 99%

Finite-Element Analysis of Electrical Machines for Sensorless Drives With High-Frequency Signal Injection

Alberti

Morandin

Gyselinck

2014

IEEE Trans. on Ind. Applicat.

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Abstract-A challenge during the design process of an electrical machine is the characterization of the various parameters in a computational time as short as possible. Frequently it is required the computation of the electrical machine parameters which are necessary for the tuning of the drive control algorithm. This paper deals with a strategy to compute the high frequency signal injection response of a sensorless controlled electrical machine. It allows to determine the self-sensing capability of the machine directly during the design process. Such a capability can be defined in any given operating point, for example along the Maximum Torque Per Amps trajectory. Then, also the high frequency machine parameters can be computed.In addition, the strategy proposed here requires a very short computational time to get such a data. After a magnetostatic field analysis, carried out so as to get the torque for a given current, the flux density distribution is stored and the differential reluctivity tensor is evaluated in each element of the mesh. Then, a time-harmonic analysis is carried out in a linearized structure so as to compute the d-q parameters at the injection frequency.In order to validate the proposed procedure, experimental results on different machine type are included in the paper. This allows to prove the reliability of the procedure as a valued tool for the characterization of the machine.

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Sensorless Direct Voltage Control of the Stand-Alone Slip-Ring Induction Generator

Cited by 105 publications

References 4 publications

Control of grid inverter based on opposite vectors hodographs

Control of grid inverter based on opposite vectors hodographs

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

Finite-Element Analysis of Electrical Machines for Sensorless Drives With High-Frequency Signal Injection

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