Transient Stability of Power Grids Comprising Wind Turbines: New Formulation, Implementation, and Application in Real-Time Assessment

Tajdinian, Mohsen; Seifi, Ali Reza; Allahbakhshi, Mehdi

doi:10.1109/jsyst.2018.2830398

Cited by 34 publications

(28 citation statements)

References 41 publications

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“…It must be noted that, due to severe disturbances in power system, the system frequency may differ from its nominal value f 0 . The latter causes undesirable instability in estimating phasor, and as a result, it must be considered in phasor estimation of numerical relays.…”

Section: Consideration Of Ccvt Model In the Fault Voltage Signalmentioning

confidence: 99%

Minimizing the undesirable effect of coupling capacitor voltage transformer on DFT-based phasor estimation method

Tajdinian

Allahbakhshi²,

Seifi

et al. 2018

Int Trans Electr Energ Syst

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Summary This paper presents an innovative half‐cycle method to minimize the undesirable effects of coupling capacitor voltage transformer (CCVT) on the discrete Fourier transform (DFT)‐based phasor estimation methods during fault condition. The proposed method analytically calculates transient components of the CCVT by using a combination of half‐cycle phase shifting along with the modified least squares technique. The latter combination is used to obtain the transient characteristics of CCVT. Afterward, subtracting estimated transient behavior from original voltage fault signal, modified half‐cycle DFT is utilized to estimate fundamental phasor component. Half‐cycle DFT formulation is modified to cope with the instability caused by off‐nominal frequency condition. Based on some case studies conducted on MATLAB software environment, the performance of the proposed phasor estimator is investigated. The results illustrate that the proposed method estimates fundamental phasor component with an ignorable effect of CCVT transient in almost half cycle after disturbance happening under different fault conditions.

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Section: Consideration Of Ccvt Model In the Fault Voltage Signalmentioning

confidence: 99%

Minimizing the undesirable effect of coupling capacitor voltage transformer on DFT-based phasor estimation method

Tajdinian

Allahbakhshi²,

Seifi

et al. 2018

Int Trans Electr Energ Syst

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“…The transient and steady-state performance enhancement of HVDC schemes has long been an intriguing area of research in academia and industry, especially in the field of offshore transmission systems. A strategy for enhancing the operation of offshore wind farms with the use of HVDC power transmission was demonstrated in [7].…”

Section: Hvdc Transient Protection and Improvement Schemementioning

confidence: 99%

“…The significance of the contingency and trajectory of a system, which result from specific disruptions, can be analysed by the transient stability index (TSI) [6]. A commonly-adopted technique for determining the transient stability in a synchronous generator is the critical clearing time (CCT), which is the maximum period of fault occurrence that does not cause any loss of synchronism in a generator [4,7].…”

Section: Introductionmentioning

confidence: 99%

Transient Faults in Wind Energy Conversion Systems: Analysis, Modelling Methodologies and Remedies

et al. 2018

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This paper presents an in-depth review of classical and state-of-the-art models for analysing the transient stability in wind energy conversion systems. Various transient simulation models for a number of wind turbine generator (WTG) configurations are introduced, under different disturbances. The mitigation is achieved, by manipulating the generator speed and power electronics control, whereas the protection is implemented using conventional, intelligent or digital relays for the safety of sensitive components, in case of transient fault occurrence. The various control systems in WECS are basically employed to transform and regulate the varying frequency, owing to the stochastic nature of wind speed, to the standard 50-Hz or 60-Hz frequency for coupling to an existing electrical utility grid. It has been observed that the control and protection schemes in wind energy systems are concurrently applied. Transient faults in WECSs are a dominant power quality problem especially in the doubly-fed induction generator (DFIG), and often classified as overcurrent or overvoltage transients. These transients are measured using the transient stability index and analysed using the EMTDC/PSCAD software. In addition, the inertia of the rotating masses of wind turbine generators is often characterized by a transient torque, which generates oscillations in power systems.

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“…It must be mentioned that in this paper, only the first cycle of fault‐current signal after fault inception is utilized to calculate τ dc , I dc , I 1 , and α 1 . As mentioned in the studies of Tajdinian, Seifi, and Allahbakhshi, Tajdinian et al, and Kundur, Balu, and Lauby, the frequency changes very slowly after fault because of power‐system inertia. Therefore, in the first cycle after the fault, the frequency remains almost unchanged.…”

Section: Current Transformermentioning

confidence: 99%

Probabilistic analysis of current‐transformer dimensioning: A criterion for determining the level of exposure to saturation

Hashemi

Tajdinian

Seifi

2018

Int Trans Electr Energ Syst

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Summary Saturation of the current transformer (CT) results in maloperation of current‐dependent protective relays. While enhancing in the core area may prevent the saturation, it simultaneously increases the size, the weight, and, subsequently, the price of the CT, which is desirable for neither the CT manufactures nor the operators. This paper conducts a probabilistic analysis to investigate the impact of influential factors on CT saturation for CT dimensioning. The main aim of the probabilistic analysis is to identify the busses of the power network in which they may be highly exposed to the CT saturation phenomena. The proposed probabilistic framework is performed based on the time‐domain fault analysis. In the probabilistic time‐domain fault analysis, the effects of fault location, fault type, and fault resistance are investigated. Also, the effects of load and generation are considered probabilistically. On the basis of the selected random variables (RVs), the probability density function (PDF) of the voltage of the knee point (VKP) is obtained. Also, a new criterion so‐called depth of saturation (DofS) is introduced that shows the level of exposure to saturation phenomena for each bus. The results show that the proposed probabilistic framework helps to find a general observation to VKP of each CT from the CT‐dimensioning aspect. Also, the proposed probabilistic framework provides some useful information about the probability of saturation area in the power system.

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Transient Stability of Power Grids Comprising Wind Turbines: New Formulation, Implementation, and Application in Real-Time Assessment

Cited by 34 publications

References 41 publications

Minimizing the undesirable effect of coupling capacitor voltage transformer on DFT-based phasor estimation method

Minimizing the undesirable effect of coupling capacitor voltage transformer on DFT-based phasor estimation method

Transient Faults in Wind Energy Conversion Systems: Analysis, Modelling Methodologies and Remedies

Probabilistic analysis of current‐transformer dimensioning: A criterion for determining the level of exposure to saturation

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