IEEE Transactions on Power Delivery Journal Impact Factor & Information

Publisher: IEEE Power Engineering Society; Institute of Electrical and Electronics Engineers, Institute of Electrical and Electronics Engineers

Journal description

Research, development, design, application, construction, installation, and operation of apparatus, equipment, structures, materials, and systems for the safe, reliable, and economic delivery and control of electrical, public, and domestic consumption.

Current impact factor: 1.66

Impact Factor Rankings

2015 Impact Factor Available summer 2015
2013 / 2014 Impact Factor 1.657
2012 Impact Factor 1.519
2011 Impact Factor 1.353
2010 Impact Factor 1.208
2009 Impact Factor 1.161
2008 Impact Factor 1.289
2007 Impact Factor 0.857
2006 Impact Factor 0.496
2005 Impact Factor 0.479
2004 Impact Factor 0.528
2003 Impact Factor 0.521
2002 Impact Factor 0.317
2001 Impact Factor 0.287
2000 Impact Factor 0.381
1999 Impact Factor 0.363
1998 Impact Factor 0.334
1997 Impact Factor 0.362
1996 Impact Factor 0.347
1995 Impact Factor 0.242
1994 Impact Factor 0.346
1993 Impact Factor 0.25
1992 Impact Factor 0.247

Impact factor over time

Impact factor

Additional details

5-year impact 1.74
Cited half-life 8.50
Immediacy index 0.17
Eigenfactor 0.02
Article influence 0.54
Website IEEE Transactions on Power Delivery website
Other titles IEEE transactions on power delivery, Institute of Electrical and Electronics Engineers transactions on power delivery, Transactions on power delivery
ISSN 0885-8977
OCLC 12761155
Material type Periodical, Internet resource
Document type Journal / Magazine / Newspaper, Internet Resource

Publisher details

Institute of Electrical and Electronics Engineers

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  • Classification
    ​ green

Publications in this journal

  • [Show abstract] [Hide abstract]
    ABSTRACT: Accepted for Publication
    IEEE Transactions on Power Delivery 08/2015;
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    ABSTRACT: This paper investigates the voltage profiles and harmonic impacts of high-speed trains on both traction power sup-ply system (TPSS) and primary utility system. Power quality (PQ) assessment has become not only a computing tool for TPSS design and planning, but also an indispensable technique for utilities to estimate the accurate PQ impacts from the railway systems. Therefore, to achieve comprehensive PQ assessment in TPSS, a dynamic fundamental / harmonic power flow (DF/HPF) method is developed in a companion paper, while further application of the technique is described in this paper. The fundamental and harmonic results calculated in a 24-hour period such as loading levels, voltage profiles, unbalance, power loss and harmonic distortions have been computed. In addition, the statistical measured background harmonics of the utility system are represented by Weibull function and also considered in the harmonic evaluation. The unbalance and harmonic impacts are investigated and checked with national standards in the paper. The proposed method can be effective for excavating and predicting the potential serious PQ problems existing in the TPSS by using a train timetable.
    IEEE Transactions on Power Delivery 08/2015; 99(99):1-10.
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    ABSTRACT: The proliferation of the voltage-source converter-based high-speed trains has resulted in significant distortions in voltage and current waveforms in both traction power supply system and utility system. The dynamic behaviors of the HSTs make the assessment of such power quality (PQ) problems a quite difficult work. There is an urgent need for techniques that can quantify the collective PQ impacts of modern trains during a 24-hour period. Dy-namic behavior modeling of the modern trains during the operating duty period between two station stops is studied here for PQ assessment. 24-hour profiles of train timetable and rail infrastructure are entered to compute the information including train positions, speeds, power consumptions, etc. Moreover, six sets of the measurement-based Norton-equivalent model under different operations are implemented to represent the dynamic harmonic behaviors of the train. In addition, the systemic modeling of utility system, traction lines and Scott-connection transformer is also described. After comparing the results of both calculations and measurements, the proposed model is ideally effective for analyzing the consequence of HST’s dynamic behavior and system topology that are involved in both fundamental power flow and harmonic power flow in order to evaluate the comprehensive PQ impacts in a companion paper.
    IEEE Transactions on Power Delivery 08/2015; 99(99):1-10.
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    ABSTRACT: A novel hybrid, modular multilevel converter is presented that utilizes a combination of half-bridge and novel three-level cells where the three-level cells utilize a clamp circuit which, under dc side faults, is capable of blocking fault current thereby avoiding overcurrents in the freewheel diodes. This dc fault blocking capability is demonstrated through simulation and is shown to be as good as the modular multilevel converter which utilizes full-bridge cells but with the added benefits of: lower conduction losses; fewer diode and semiconductor switching devices, and; fewer shoot-through modes. The semiconductor count and conduction loss of the proposed converter are reduced to around 66.5% and 72% of that of modular multilevel converter based on the full-bridge cells respectively, yielding lower semiconductor cost and improved efficiency. Dc fault ride-through operation is realized without exposing the semiconductors to significant fault currents and overvoltages due to the full dc fault blocking capability of the converter.
    IEEE Transactions on Power Delivery 08/2015; 30(4):1-1. DOI:10.1109/TPWRD.2015.2423258
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    ABSTRACT: This paper presents a new noninvasive method for calculating utility harmonic impedance at the point of common coupling (PCC). The proposed method is based on a statistical signal-processing technique, known as independent component analysis (ICA). The complex ICA technique is applied to the equations derived from Northon equivalent circuit model at the PCC in order to estimate the utility harmonic current values. Then, the estimated values of the utility harmonic current are used in an optimization problem to calculate the utility harmonic impedance. Due to considering the utility harmonic current variations in utility harmonic impedance calculation, the proposed method is relatively robust against the background harmonic fluctuations. The results obtained from computer simulation and a real case study verify the effectiveness of the proposed method.
    IEEE Transactions on Power Delivery 08/2015; 30(4):1-1. DOI:10.1109/TPWRD.2015.2398820
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    ABSTRACT: Power transformers have important roles as voltage converters in substations, which directly affect the safe operation of power grids. Online monitoring of winding deformation, which is one of the most common transformer faults, is crucial in protecting transformers from damage, particularly those induced by short-circuit current failures, and ensuring their safe operation. This study proposes an improved online monitoring method for winding deformations based on the Lissajous graphical analysis of voltage and current. A practical measurement system is also presented and discussed in this paper. A load normalization method is proposed to solve the problem of Lissajous diagrams changing as load varies. Finally, transformer and winding experiments are performed to verify the validity of the proposed load normalization method and the feasibility of the proposed monitoring method in distinguishing winding deformations with different degrees and locations.
    IEEE Transactions on Power Delivery 08/2015; 30(4):1-1. DOI:10.1109/TPWRD.2015.2418344
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    ABSTRACT: In order to improve the performance of the conventional distance protection scheme under high-resistance fault, an adaptive distance protection scheme is proposed in this paper. First, according to the geometric distribution characteristics of voltage and current in the system, the equation of voltage drop from the relaying point to the fault point is established. Second, the fault point is determined by the measured current and the measured negative-sequence current. And then, the new adaptive distance protection criterion is formed according to the relationship between the fault point and the protection zone. Simulation tests on the Real Time Digital Simulator verify that the proposed scheme is able to modify the protection setting value adaptively online, and is immune to the impact of transition resistance and load current. Besides, it has the potential to be applied in a real power system because of small computation amount and high accuracy.
    IEEE Transactions on Power Delivery 08/2015; 30(4):1-1. DOI:10.1109/TPWRD.2015.2404951
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    ABSTRACT: Conventional practice for transformer dissolved gas analysis (DGA) is to use concentrations of several fault gases, with or without total dissolved combustible gas, for evaluating apparent fault severity. We suggest a simpler approach based on the normalized energy intensity (NEI), a quantity related directly to fault energy dissipated within the transformer. DGA fault severity scoring based on NEI is shown to be sensitive to all IEC fault types and to be more responsive to shifts in the relative concentrations of the fault gases than scoring based on fault gas concentrations. Instead of eight or more gas concentration limits, NEI scoring requires only two or three limits that can be empirically derived to suit local requirements for any population of mineral-oil-filled power transformers.
    IEEE Transactions on Power Delivery 08/2015; 30(4):1-1. DOI:10.1109/TPWRD.2015.2415767
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    ABSTRACT: A novel optimization-enabled electromagnetic transient simulation (OE-EMTS) approach is proposed for calculating the resistor setting of a multistage impulse generator for insulation impulse testing of high voltage transformers. This approach enables test engineers to overcome most of the major challenges attributed to the use of conventional trial-and-error methods for determining resistor settings, including the excessive time consumption and the potential damage to the test transformer due to higher number of trial tests. The proposed method uses the frequency response of the test transformer to synthesize a circuit model for it. The test setup, including the test transformer and the impulse generator, is simulated using an EMT-type simulator. A genetic algorithm (GA) based approach is used to optimize the setting of the impulse generator. Optimized resistor values are then used in impulse testing of a three phase power transformer. Different cases of impulse generator resistor arrangements are studied in this paper and simulated waveforms are compared with those obtained from measurements.
    IEEE Transactions on Power Delivery 08/2015; 30(4):1-1. DOI:10.1109/TPWRD.2015.2429554
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    ABSTRACT: In this paper, a winding condition assessment model using vibration signals is presented, which can be used to diagnose power transformers online. The basic principle of this model is based on the correlation analysis of winding vibrations. In the model, the fundamental frequency vibration analysis is used to separate the winding vibration from the mixed signal. Then, a health parameter is proposed via principal component analysis. Another parameter is also proposed to detect the fault locations for suspected faulty transformers. In laboratory tests, the model is validated on a specifically designed 110-kV transformer. During the tests, man-made winding deformations are simulated to compare the vibrations under different conditions. The model has also been tested on several in-service power transformers. The preliminary study shows that the proposed model is feasible to assess the power transformer winding condition.
    IEEE Transactions on Power Delivery 08/2015; 30(4):1735-1742. DOI:10.1109/TPWRD.2014.2376033
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    ABSTRACT: Previous studies have shown that a transformer's modal characteristics can be identified by its internal electromagnetic excitations and are related to structural damage. These may be useful for diagnosing the causes of failure modes in power transformers during normal operation. Operational modal analysis (OMA) appears to be a suitable tool for this purpose. In this letter, the feasibility of OMA in identifying transformer modal parameters is discussed with a special focus on the mechanisms of natural excitation. OMA is also applied to a 10-kVA transformer with and without artificially designed structural damage. Good correlation is obtained between the results of OMA and those of experimental modal analysis.
    IEEE Transactions on Power Delivery 08/2015; 30(4):1-1. DOI:10.1109/TPWRD.2015.2412696
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    ABSTRACT: The segregated phase comparison technique is a notable form of differential protection which compares the phase angle of end currents of a transmission line. The literature shows that phase differential protection serves as a better option for transmission-line protection due to its simplicity, sensitivity, selectivity and comprehensibility. However, line-charging current causes a significant error in the phase angle of two end currents of a transmission line. This paper presents improved phase comparison which compensates error due to line-charging current and a function of a cosine scheme using the equivalent- model of the transmission line. The phase differential function is developed using phase coordinates. The scheme is compared with the existing scheme like, conventional scheme based on line currents, the positive-sequence component of line currents and a mixed combination of line currents. The global positioning system is used for time-synchronised measurements and fiber optics are considered for data communication. Simulations are carried out in an Alternate Transients Program/Electromagnetic Transients Program on an IEEE 14-bus system, and a protection scheme is implemented on one of the tie lines. The results demonstrate the accuracy of the proposed approach over the existing schemes.
    IEEE Transactions on Power Delivery 08/2015; 30(4):1-1. DOI:10.1109/TPWRD.2015.2417997
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    ABSTRACT: In this paper, a new equivalent circuit for the transformer winding is presented by which the eddy current losses in the transformer can be represented accurately at high frequencies. The new model enables representing the frequency-dependent impedances of a coil system using the idea of mutually coupled series Foster circuits. An effective method for the determination of model parameters is also provided which involves using the vector-fitting (VF) method for the rational approximation of the system impedance matrix using a certain number of common stable poles. A set of nonlinear equations is then established using the VF results that can be solved with the method of fixed-point iteration to obtain the parameters of the equivalent circuit in a fast and accurate way. The new model can be used for the calculation of resonance transients within the transformer, the situation wherein the maximal value of overvoltages is highly dependent to the damping effects or the loss phenomena in the transformer. Since the model only contains constant lumped parameters, it can be used for transient calculations in the time domain directly using the electromagnetic transients programs, such as the Alternative Transients Program or Electromagnetic Transients Program.
    IEEE Transactions on Power Delivery 08/2015; 30(4):1743-1751. DOI:10.1109/TPWRD.2014.2361761
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    ABSTRACT: Currently, self-healing is one of the most important functions in the smart grid. Meanwhile, fault detection, isolation, and restoration of feeder automation systems dominate the self-healing function in power distribution systems. The steps of the aforementioned function depend on the fault flag status of the feeder terminal unit. The conditions for setting this flag are judged by the feeder terminal unit overcurrent detecting curve. This paper found an efficient approach to calculate this curve via a half-interval method. Versatile application software with the curve plotting capability was also developed and deployed on the web server of the information-management department of Taiwan Power Company and is running successfully.
    IEEE Transactions on Power Delivery 08/2015; 30(4):1898-1905. DOI:10.1109/TPWRD.2014.2375878
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    ABSTRACT: In this paper, a simplified method for channel capacity estimation has been derived based on the transmission-line theory under the condition of high-bandwidth utilization. This method decouples the channel capacity into several independent components which may help to investigate the effects of backbone and branch, respectively. Analysis of backbone effects with respect to the available bandwidth reveals the applicable condition for the simplified method. Single branch effects are investigated considering branch length together with the loads. Besides, coupling effects caused by branch interactions are studied in a statistical way. The simulation results show great consistencies by using the proposed method and the conventional one and reveal the way that branches affect the channel capacity in different power networks.
    IEEE Transactions on Power Delivery 08/2015; 30(4):1-1. DOI:10.1109/TPWRD.2015.2401601
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    ABSTRACT: In areas with heavy dust or continuous wind in a single direction, fan-shaped nonuniform contamination at the windward and leeward side of the insulator string may affect flashover performance. In this paper, dc pollution flashover tests of insulators under fan-shaped nonuniform pollution were presented, and a comparison of flashover performance among 7-unit suspension insulator strings with four different disk profiles was made. Then, the influence of fan-shaped nonuniform pollution on flashover voltage, arc propagation, and critical leakage distance were investigated. Research results indicate that the insulators with different types were influenced variously on their flashover stress, utilization rate of creepage distance, and critical leakage distance by fan-shaped nonuniform pollution. A reduction in the ratio W/L of windward to leeward side salt deposit density (SDD) from 1/1 to 1/15 gave a median 35% 4% decrease in flashover strength. The extrapolation of results for the seven-unit strings suggests that some increment in shed space or structure height of the insulator can be preferable in dc transmission lines where there is fan-shaped nonuniform pollution accumulating at the windward and leeward side of the insulator string.
    IEEE Transactions on Power Delivery 08/2015; 30(4):1-1. DOI:10.1109/TPWRD.2014.2388215
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    ABSTRACT: A new hybrid cascaded modular multilevel converter for the high-voltage dc transmission system is presented. The half-bridge cells are used on the main power stage and the cascade full-bridge (FB) cells are connected to its ac terminals. The main power stage generates the fundamental voltages with quite low switching frequency, resulting in relatively low losses. The cascaded FB cells only attenuate the harmonics generated by the main power stage, without contribution to the power transfer. Thus, the energy-storage requirement of the cascaded FB cells is low and the capacitance of FB cells is reduced significantly. Due to the dc fault reverse blocking capability of the cascaded FB cells, the proposed topology can ride-through the pole-to-pole dc fault. In addition, the soft restart is achieved after the fault is eliminated, without exposing the system to significant inrush current. Besides, the average-value model of the proposed topology is derived, based on which the control strategy is presented. The results show the feasibility of the proposed converter.
    IEEE Transactions on Power Delivery 08/2015; 30(4):1-1. DOI:10.1109/TPWRD.2015.2389758