Minimization of shaft oscillations by fuzzy controlled SMES considering time delay

Ali, Mohd. Hasan; Wu, Bin; Tamura, Junji; Dougal, Roger A.

doi:10.1016/j.epsr.2009.12.001

Cited by 10 publications

(8 citation statements)

References 33 publications

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“…In this work, the effect of SVC or SC on minimizing the torsional oscillations is evaluated by using the index, TOR (pu s) given as follows:

T O R = true \int_{0}^{t_{s i m}} (||, Δ, Torque) d t ((), p u s)

where ΔTorque is the torsional oscillations in Gen‐LP and LP‐HP sections and t sim is the simulation time. A better performance of devices is verified by the lower values of TOR index.…”

Section: Simulations and Discussionmentioning

confidence: 99%

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Comparing SVC and synchronous condenser performance in mitigating torsional oscillations

Ganjefar

Farahani

2014

Int. Trans. Electr. Energ. Syst.

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Summary This paper compares the performance of a synchronous condenser (SC) and static VAR compensator (SVC) in damping subsynchronous oscillations in a power system compensated by series capacitors by simulating different cases. In order to increase the damping of both, an auxiliary controller named supplementary subsynchronous damping controller (SSDC) is used. The generator acceleration power signal is selected as the stabilizing signal for the SSDC. To enhance the accuracy of the simulations, the impact of time delay related to the stabilizing signal is investigated. The simulation results of the different faults show that the SVC and SC are able to minimize the torsional oscillations, while the time delay has a negative effect on the performance of the SVC and SC. Hence, the performance of both in damping the oscillations is attenuated. Copyright © 2014 John Wiley & Sons, Ltd.

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“…In this work, the effect of SVC or SC on minimizing the torsional oscillations is evaluated by using the index, TOR (pu s) given as follows:

T O R = true \int_{0}^{t_{s i m}} (||, Δ, Torque) d t ((), p u s)

where ΔTorque is the torsional oscillations in Gen‐LP and LP‐HP sections and t sim is the simulation time. A better performance of devices is verified by the lower values of TOR index.…”

Section: Simulations and Discussionmentioning

confidence: 99%

“…As seen in Figure , the time delay is described by e −τs in this paper. The value of the time delay ( τ ) has been discussed in . The range of time delay usually varies from several microseconds to few hundred milliseconds.…”

Section: Supplementary Subsynchronous Damping Controller (Ssdc)mentioning

confidence: 99%

Comparing SVC and synchronous condenser performance in mitigating torsional oscillations

Ganjefar

Farahani

2014

Int. Trans. Electr. Energ. Syst.

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“…The presented method in Ali et al. 11 analyzed the effect of fuzzy logic-controlled super-conductive magnetic energy storage (SMES) on minimizing shaft torsional oscillations of synchronous generators in a multi-machine power system. In the aforementioned paper, considering only one input variable and one output variable, the proposed fuzzy logic controller has been designed.…”

Section: Introductionmentioning

confidence: 99%

An experimental oscillation damping impedance control for the Novint Falcon haptic device based on the phase trajectory length function concept

Zarei

Kalhor

Masouleh

2018

Proceedings of the Institution of Mechanical Engineers, Part C:

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This paper aims at designing an oscillationless open-loop impedance controller for a well-known low-cost haptic device, namely the Novint Falcon haptic device. In this regard, the oscillation number index standing for the ratio of the traversed path in the corresponding phase portrait systems for a certain state to its radial value is employed to evaluate the oscillatory behavior of the system. Based on the identified parameters of the dynamic equation, a precise model of the intended robot is developed in the SimMechanics simulator. According to the obtained results in the simulation, one can infer that there is a certain impedance value in which the value of the oscillation number index has its minimum value. The obtained experimental results reveal that the oscillation number index based controller possesses lower oscillation in comparison to the Falcon’s official software development kit. In fact, by tuning the system’s impedance will result in a better performance for the haptic purposes.

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“…Transient faults in a power system lead to a shaft torsional oscillation of synchronous generators . Therefore, the effect of fuzzy logic‐controlled SMES on minimizing shaft torsional oscillations of the generators in a multi‐machine power system was analyzed.…”

Section: Introductionmentioning

confidence: 99%

“…Transient faults in a power system lead to a shaft torsional oscillation of synchronous generators. 16 Therefore, the effect of fuzzy logic-controlled SMES on minimizing shaft torsional oscillations of the generators in a multi-machine power system was analyzed. Ngamroo 17 proposed an optimization technique to adjust the power controller parameters and coil size of multiple SMES units in interconnected power systems with wind farms.…”

mentioning

confidence: 99%

A new controlled superconducting magnetic energy storage for dynamic stabilization of distributed generation in islanding mode of operation

Asadi

Meyar‐Naimi

Jahangiri

2017

Int Trans Electr Energ Syst

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Summary According to IEEE std. 1547, islanding mode is “a condition in which a portion of an Electric Power System (EPS) is energized solely by one or more local EPSs through the associated Point of Common Coupling (PCC) while that portion is electrically separated from the rest of the area EPS”. Therefore, the dynamic instability due to islanding may result in power swing and finally loss of synchronism. Hence, many studies have been done for islanding detection and disconnection of distributed generation (DG) in an EPS. But, these conventional methods eventually lead to the disconnection of the DG units. To improve DG dynamic stability, superconducting magnetic energy storage (SMES) can be used effectively, because SMES have a high‐energy density and fast response. This paper proposes a new method to damp the power swing after DG islanding and to maintain synchronism conditions based on SMES. Hence, the disconnection of the DG units is not required. Also, new controllers are developed for SMES including voltage source converter (VSC), and DC‐DC chopper. The controller structures of VSC and DC‐DC chopper are of PI and fuzzy logic‐based type, respectively. Superconducting coil charging is controlled by the DC‐DC chopper. SMES sizing is performed, based on power swing equations. Hereupon, dynamic load model is considered. Performance of the proposed method is evaluated by defining 12 scenarios such as strong and weak networks with load changing simulated in PSCAD. Simulation results show that the islanded DG stabilization (IDGS) method has good performance to maintain stability margin in a weak network.

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Minimization of shaft oscillations by fuzzy controlled SMES considering time delay

Cited by 10 publications

References 33 publications

Comparing SVC and synchronous condenser performance in mitigating torsional oscillations

Comparing SVC and synchronous condenser performance in mitigating torsional oscillations

An experimental oscillation damping impedance control for the Novint Falcon haptic device based on the phase trajectory length function concept

A new controlled superconducting magnetic energy storage for dynamic stabilization of distributed generation in islanding mode of operation

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