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  • 351.
    Wang, Ying
    et al.
    College of Electrical Engineering and Information Technology, Sichuan University.
    Bagheri, Azam
    Luleå tekniska universitet, Institutionen för teknikvetenskap och matematik, Energivetenskap.
    Bollen, Math
    Luleå tekniska universitet, Institutionen för teknikvetenskap och matematik, Energivetenskap.
    Xiao, Xian-Xong
    College of Electrical Engineering and Information Technology, Sichuan University.
    Single-Event Characteristics for Voltage Dips in Three-Phase Systems2017Inngår i: IEEE Transactions on Power Delivery, ISSN 0885-8977, E-ISSN 1937-4208, Vol. 32, nr 2, s. 832-840, artikkel-id 7496837Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    This paper compares different methods for voltage-dip characterization. Those methods are based on earlier proposed algorithms for extracting three-phase characteristics (dip type, characteristic voltage, and so-called “PN factor”). The difference between the 12 methods being studied in this paper is in the way in which the time variation of those characteristics is treated to result in single-event characteristics. The methods are applied to 259 measured voltage dips and the performance of the different methods is compared. It is found that small differences in method can result in big difference in results. From the comparison, two methods are selected and recommended for inclusion in international standards.

  • 352.
    Wang, Ying
    et al.
    College of Electrical Engineering and Information Technology, Sichuan University.
    Bollen, Math
    Luleå tekniska universitet, Institutionen för teknikvetenskap och matematik, Energivetenskap.
    Bagheri, Azam
    Luleå tekniska universitet, Institutionen för teknikvetenskap och matematik, Energivetenskap.
    Xiao, Xian-Xong
    College of Electrical Engineering and Information Technology, Sichuan University.
    Olofsson, Magnus
    Elforsk, Energiforsk AB, Stockholm.
    A quantitative comparison approach for different voltage dip characterization methods2016Inngår i: Electric power systems research, ISSN 0378-7796, E-ISSN 1873-2046, Vol. 133, s. 182-190Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    This paper presents a systematic approach to compare different methods for characterizing voltage dips in a quantitative way. A prediction error is calculated between measured and synthetic dips (reproduced from single-event characteristics for the measured dips) with respect to the way they impact the performance of a generic device. The proposed approach is illustrated by comparing seven different characterization methods and their ability to predict the minimum dc-bus voltage of a three-phase adjustable-speed drive. A generic model of such a drive is used for this. Based in this comparison it is concluded that characterization method for dips in three-phase systems should include unbalance and phase-angle jump.

  • 353.
    Wang, Ying
    et al.
    College of Electrical Engineering and Information Technology, Sichuan University.
    Bollen, Math
    Luleå tekniska universitet, Institutionen för teknikvetenskap och matematik, Energivetenskap.
    Xiao, X. Y.
    College of Electrical Engineering and Information Technology, Sichuan University.
    Calculation of the phase-angle-jump for voltage dips in three-phase systems2015Inngår i: IEEE Transactions on Power Delivery, ISSN 0885-8977, E-ISSN 1937-4208, Vol. 30, nr 1, s. 480-487, artikkel-id 6899711Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    The phase-angle-jump is defined in this paper as another single-event characteristic of voltage dips, besides residual or characteristic voltage and duration. This paper proposes and compares six methods to calculate the phase-angle-jump for measured voltage dips in a three-phase system. This paper also studies the details of the calculation: correcting frequency and transition segments. The six proposed methods have been applied to 235 sets of measured voltage dips and a statistical comparison has been made. It is recommended that two of the methods be included in IEEE Standard 1564 and IEC 61000-4-30.

  • 354.
    Wang, Ying
    et al.
    Luleå tekniska universitet, Institutionen för teknikvetenskap och matematik, Energivetenskap.
    Bollen, Math
    Luleå tekniska universitet, Institutionen för teknikvetenskap och matematik, Energivetenskap.
    Xiao, X. Y.
    Mitigating the effects due to voltage dips by considering the Process Immunity Time2014Konferansepaper (Fagfellevurdert)
  • 355.
    Wang, Ying
    et al.
    College of Electrical Engineering and Information Technology, Sichuan University.
    Xiao, Xianyong
    College of Electrical Engineering and Information Technology, Sichuan University.
    Bollen, Math
    Luleå tekniska universitet, Institutionen för teknikvetenskap och matematik, Energivetenskap.
    Challenges in the Calculation methods of Point-on-Wave Characteristics for Voltage Dips2016Inngår i: 2016 17th International Conference on Harmonics and Quality of Power, Piscataway, NJ, 2016, s. 513-517, artikkel-id 7783435Konferansepaper (Fagfellevurdert)
    Abstract [en]

    Point-on-wave (POW) is an important single-event characteristic of voltage dips. Both POW of initiation and of recovery may affect the equipment. POW is important information to accurate evaluate the equipment performance and behavior during a voltage dip. The 'predefined thresholds approach (PTA)' and the 'waveform envelope approach (WEA)' are two approaches to calculate POW. This paper analyzes the challenges of existing POW calculation methods. Some improvement work is suggested to address these challenges

  • 356.
    Wämundson, Mikael
    et al.
    STRI AB.
    Höglund, Johan
    STRI AB.
    Bollen, Math
    Luleå tekniska universitet, Institutionen för teknikvetenskap och matematik, Energivetenskap.
    Holm, Anders
    Vattenfall Research & Development.
    Pending-Wiberg, Eva
    Vattenfall Eldistribution AB.
    Classification of industrial customers regarding sensitivity towards interruptions2011Inngår i: IEEE PES Innovative Smart Grid Technologies Conference Europe: (ISGT Europe 2010) : Gothenburg, Sweden, 11 - 13 October 2010, Piscataway, NJ: IEEE Communications Society, 2011Konferansepaper (Fagfellevurdert)
  • 357.
    Wämundson, Mikael
    et al.
    STRI AB.
    Höglund, Johan
    STRI AB.
    Bollen, Math
    Holm, Anders
    Vattenfall Research & Development.
    Wiberg, Eva Pending
    Vattenfall Research & Development.
    Individual interruption costs of industrial customers as basis for a classification.2011Inngår i: Proceedings of CIRED 21st International Conference on Electricity Distribution, 2011, artikkel-id paper id 0253Konferansepaper (Fagfellevurdert)
    Abstract [en]

    This paper describes the possibilities to classify electric distribution customers into different categories depending on their individual sensitivity towards supply interruptions. The sensitivity is regarded from an economical view, i.e. the relation between the duration of an interruption and the costs experienced by the customer. For a distribution-system operator (DSO) making decisions on network reinforcements and restoration planning, having information on the individual customer’s sensitivity towards interruption is very valuable.

  • 358.
    Wämundsson, Mikael
    et al.
    STRI.
    Bollen, Math
    Luleå tekniska universitet, Institutionen för teknikvetenskap och matematik, Energivetenskap.
    Predicting the number of voltage dips as a function of both voltage and duration2008Inngår i: 2008 13th International Conference on Harmonics and Quality of Power: [ICHQP 2008] ; Wollongong, Australia, 28 September - 1 October 2008, Piscataway, NJ: IEEE Communications Society, 2008Konferansepaper (Fagfellevurdert)
    Abstract [en]

    This paper present a method for predicting voltage dips as experienced by customers due to faults in the power grid. Where earlier methods considered only the magnitude (residual voltage) of the dips, this paper considers both magnitude and duration. A triangular distribution is assumed for the dip duration for each of three zones, together with probabilities for each zone. The dips are generated randomly by means of a Monte-Carlo simulation, with fault location along the line and dip duration as random variables. The results can next be analyzed by any of the methods developed for analyzing voltage-dip measurements. The method is illustrated by means of the dips experienced by an industrial installation connected to the 130-kV subtransmission network.

  • 359.
    Yang, Kai
    et al.
    Luleå tekniska universitet, Institutionen för teknikvetenskap och matematik, Energivetenskap.
    Bollen, Math
    Luleå tekniska universitet, Institutionen för teknikvetenskap och matematik, Energivetenskap.
    Measurements of Complex Harmonic Current on Two Wind turbines2014Inngår i: The Renewable Energies and Power Quality Journal (RE&PQJ), ISSN 2172-038X, E-ISSN 2172-038X, nr 12, artikkel-id 297Artikkel i tidsskrift (Fagfellevurdert)
  • 360. Yang, Kai
    et al.
    Bollen, Math
    Luleå tekniska universitet, Institutionen för teknikvetenskap och matematik, Energivetenskap.
    Amaris, Hortensia
    University Carlos III, Madrid.
    Alvarez, Carlos
    Energy to Quality, Madrid.
    Decompositions of harmonic propagation in wind power plant2016Inngår i: Electric power systems research, ISSN 0378-7796, E-ISSN 1873-2046, Vol. 141, s. 84-90Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    This paper presents harmonic propagation in a wind power plant. The two groups of propagation are distinguished based on the harmonic sources: propagation from one individual wind turbine to other turbines and to the public grid; and propagation from the public grid to the collection grid and to individual wind turbines. The paper studies the characteristics of the different harmonic propagation paths. A case with emission from all turbines, at different production levels, and from the public grid is presented as well. Also the impact of a turbine filter on the propagation is studied. The study indicates that, resonances of a wind power plant have a significant impact on the propagation. It is also shown that harmonic studies should consider both emission originating from turbines and emission originating from the public grid. It is also shown that the filter with the turbine has a significant impact on the harmonic propagation.

  • 361.
    Yang, Kai
    et al.
    Luleå tekniska universitet, Institutionen för teknikvetenskap och matematik, Energivetenskap.
    Bollen, Math
    Luleå tekniska universitet, Institutionen för teknikvetenskap och matematik, Energivetenskap.
    Larsson, Anders
    Luleå tekniska universitet, Institutionen för teknikvetenskap och matematik, Energivetenskap.
    Aggregation and amplification of wind-turbine harmonic emission in a wind park2015Inngår i: 2015 IEEE Power & Energy Society General Meeting: 26-30 July 2015, Denver CO, Piscataway, NJ: IEEE Communications Society, 2015Konferansepaper (Annet vitenskapelig)
    Abstract [en]

    This paper presents measurements of harmonic and interharmonic current (with 5 Hz frequency resolution) in the complex plane. The complex currents are spread around a center point. For interharmonics this center corresponds with the origin of the complex plane. For integer harmonics this center is off-set from the origin. A goodness-of-fit test reveals that phase angles of most interharmonics are uniformly distributed. A Monte-Carlo simulation based on the measurements has been performed to study the aggregation of the emission from individual turbines to the public grid. Low-order integer harmonics show less cancellation compared to high-order harmonics. Interharmonics aggregate close to the square-root rule for uniform phase angles.

  • 362.
    Yang, Kai
    et al.
    Luleå tekniska universitet, Institutionen för teknikvetenskap och matematik, Energivetenskap.
    Bollen, Math
    Luleå tekniska universitet, Institutionen för teknikvetenskap och matematik, Energivetenskap.
    Larsson, Anders
    Luleå tekniska universitet, Institutionen för teknikvetenskap och matematik, Energivetenskap.
    Aggregation and Amplification of Wind-Turbine Harmonic Emission in a Wind Park2015Inngår i: IEEE Transactions on Power Delivery, ISSN 0885-8977, E-ISSN 1937-4208, Vol. 30, nr 2, s. 791-799, artikkel-id 7042349Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    This paper presents measurements of harmonic and interharmonic current (with 5 Hz frequency resolution) in the complex plane. The complex currents are spread around a center point. For interharmonics this center corresponds with the origin of the complex plane. For integer harmonics this center is off-set from the origin. A goodness-of-fit test reveals that phase angles of most interharmonics are uniformly distributed. A Monte-Carlo simulation based on the measurements has been performed to study the aggregation of the emission from individual turbines to the public grid. Low-order integer harmonics show less cancellation compared to high-order harmonics. Interharmonics aggregate close to the square-root rule for uniform phase angles.

  • 363.
    Yang, Kai
    et al.
    Luleå tekniska universitet, Institutionen för teknikvetenskap och matematik, Energivetenskap.
    Bollen, Math
    Luleå tekniska universitet, Institutionen för teknikvetenskap och matematik, Energivetenskap.
    Larsson, Anders
    Luleå tekniska universitet, Institutionen för teknikvetenskap och matematik, Energivetenskap.
    Wind power harmonic aggregation of multiple turbines in power bins2014Inngår i: International Conference on Harmonics and Quality of Power. Proceedings: , s. 723-727, artikkel-id 6842922Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    The paper presents current harmonic and interharmonic measurement of a Type-IV wind turbine. Characterizations and classifications have been performed with the representation of harmonics and interharmonics in a complex plane. The study of aggregations due to the summation of complex currents has been performed based on Monte-Carlo Simulation for harmonics and interharmonics. Aggregations occur less for low-order harmonics, more for high-order harmonics and most for interharmonics. Aggregations are shown to be largely independent of the produced power

  • 364.
    Yang, Kai
    et al.
    Luleå tekniska universitet, Institutionen för teknikvetenskap och matematik, Energivetenskap.
    Bollen, Math
    Luleå tekniska universitet, Institutionen för teknikvetenskap och matematik, Energivetenskap.
    Larsson, Anders
    Luleå tekniska universitet, Institutionen för teknikvetenskap och matematik, Energivetenskap.
    Wahlberg, Mats
    Luleå tekniska universitet, Institutionen för teknikvetenskap och matematik, Energivetenskap.
    A statistic study of harmonics and interharmonics at a modern wind-turbine2014Inngår i: International Conference on Harmonics and Quality of Power. Proceedings: , s. 718-722, artikkel-id 6842921Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    The work presents measurements of harmonics and interharmonics from a modern wind turbine over a period of several days, using a conventional power quality monitor. A statistical study has been performed to present the characteristics of the emission during the measurement. A variation of emission has been observed, especially for interharmonics within certain low-frequency bands and for the switching frequency. Multiple relations between voltage and current components have been presented, as well as multiple relations between the emission and the active-power production. Generally, harmonics are independent of the active-power, whereas interharmonics are dependent on it.

  • 365.
    Yang, Kai
    et al.
    Luleå tekniska universitet, Institutionen för teknikvetenskap och matematik, Energivetenskap.
    Bollen, Math
    Luleå tekniska universitet, Institutionen för teknikvetenskap och matematik, Energivetenskap.
    Larsson, Anders
    Luleå tekniska universitet, Institutionen för teknikvetenskap och matematik, Energivetenskap.
    Wahlberg, Mats
    Luleå tekniska universitet, Institutionen för teknikvetenskap och matematik.
    Measurements of harmonic emission versus active power from wind turbines2014Inngår i: Electric power systems research, ISSN 0378-7796, E-ISSN 1873-2046, nr 108, s. 304-314Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    This paper presents harmonic measurements from three individual wind turbines (2 and 2.5MW size). Both harmonics and interharmonics have been evaluated, especially with reference to variations in the active-power production. The overall spectra reveal that, emission components may occur at any frequency and not only at odd harmonics. Interharmonics and even harmonics emitted from wind turbines are relatively high. Individual frequency components depend on the power production in dierent ways: characteristic harmonics are independent of power; interharmonics show a strong correlation with power; other harmonic and interharmonic components present various patterns. It is concluded that the power production is not the only factor determining the current emission of a wind energy conversion system.

  • 366.
    Yang, Kai
    et al.
    Luleå tekniska universitet, Institutionen för teknikvetenskap och matematik, Energivetenskap.
    Bollen, Math
    Luleå tekniska universitet, Institutionen för teknikvetenskap och matematik, Energivetenskap.
    Wahlberg, Mats
    Luleå tekniska universitet, Institutionen för teknikvetenskap och matematik, Energivetenskap.
    A comparison study of harmonic emission measurements in four windparks2011Inngår i: 2011 IEEE Power and Energy Society General Meeting, Piscataway, NJ: IEEE Communications Society, 2011Konferansepaper (Fagfellevurdert)
    Abstract [en]

    This paper presents measurements of harmonic current emissions up till 2 kHz from four different windparks in northern Sweden, all equipped with modern power-electronics converters. The measurement results are presented in different ways, including a method to quantify the impact on the grid and a method to show the variations in the spectrum with time. The results show that there exists different dominating harmonics in different windturbines and that the magnitudes of the individual frequency components vary strongly with time. Each turbine however shows a broadband component with superimposed narrowband components. The impact on the grid, with reference to permissible levels of voltage distortion, is biggest for the interharmonic components

  • 367.
    Yang, Kai
    et al.
    Luleå tekniska universitet, Institutionen för teknikvetenskap och matematik, Energivetenskap.
    Bollen, Math
    Luleå tekniska universitet, Institutionen för teknikvetenskap och matematik, Energivetenskap.
    Wahlberg, Mats
    Luleå tekniska universitet, Institutionen för teknikvetenskap och matematik, Energivetenskap.
    Characteristic and non-characteristic harmonics from windparks2011Inngår i: Proceedings of CIRED 21st International Conference on Electricity Distribution, CIRED - Congrès International des Réseaux Electriques de Distribution, 2011, artikkel-id 0251Konferansepaper (Fagfellevurdert)
    Abstract [en]

    This paper presents measurements of harmonic current emissions up till 2 kHz from four different windparks in northern Sweden, all equipped with modern power-electronics converters. A study of the four windparks was performed interms of 95% value of harmonic current spectrum and the minimum fault-level needed to fulfil the EN 50160 requirements on voltage distortion. The results show that there exists different dominating harmonics and fault-level requirements for different windturbines. Each turbine however shows a broadband component with superimposed narrowband components. The impact on the grid, with reference to permissible levels of voltage distortion, is biggest for the interharmonic components.

  • 368.
    Yang, Kai
    et al.
    Luleå tekniska universitet, Institutionen för teknikvetenskap och matematik, Energivetenskap.
    Bollen, Math
    Luleå tekniska universitet, Institutionen för teknikvetenskap och matematik, Energivetenskap.
    Wahlberg, Mats
    Luleå tekniska universitet, Institutionen för teknikvetenskap och matematik.
    Comparison of harmonic emissions at two nodes in a windpark2012Inngår i: 15th IEEE International Conference on Harmonics and Quality of Power (ICHQP 2012), IEEE Communications Society, 2012, s. 313-319Konferansepaper (Fagfellevurdert)
    Abstract [en]

    This work presents a comparison study of measurements of power quality, with emphasis on voltage and current distortion, at two locations in the same windpark, located in northern Sweden. Emissions at both locations are compared based on both harmonics and interharmonics. A complete picture of spectrum during the measurement is presented to show the variations of emission in the windpark. Some dominating harmonics are further analyzed.

  • 369.
    Yang, Kai
    et al.
    Luleå tekniska universitet, Institutionen för teknikvetenskap och matematik, Energivetenskap.
    Bollen, Math
    Luleå tekniska universitet, Institutionen för teknikvetenskap och matematik, Energivetenskap.
    Wahlberg, Mats
    Luleå tekniska universitet, Institutionen för teknikvetenskap och matematik.
    Measurements at two different nodes of a windpark2012Inngår i: 2012 IEEE Power and Energy Society General Meeting, Piscataway, NJ: IEEE Communications Society, 2012Konferansepaper (Fagfellevurdert)
    Abstract [en]

    This paper presents measurements of power quality, with emphasis on voltage and current distortion, simultaneously at two locations in the same windpark, located in northern Sweden. Both harmonics and interharmonics components are considered in the study. Similarities and differences between voltage and current distortion are presented in this paper and possible explanations are discussed. One of the conclusions is that there is no simple relation between voltage and current distortion in a windpark.

  • 370.
    Yang, Kai
    et al.
    Luleå tekniska universitet, Institutionen för teknikvetenskap och matematik, Energivetenskap.
    Bollen, Math
    Luleå tekniska universitet, Institutionen för teknikvetenskap och matematik, Energivetenskap.
    Wahlberg, Mats
    Luleå tekniska universitet, Institutionen för teknikvetenskap och matematik.
    Measurements of four-windpark harmonic emissions in northern Sweden2012Konferansepaper (Fagfellevurdert)
    Abstract [en]

    This paper presents measurements of harmonic current emissions up till few kHz from four different wind parks in northern Sweden, all equipped with modern power-electronics converters. Measurements have been performed with 10-minute time resolution between one and several weeks. The measurement results are presented in different ways, including a method to show the variations in the harmonic emissions with time. The results show that there exists different dominating harmonics in different wind turbines and that the magnitudes of the individual frequency components vary strongly with time. Each turbine however shows a broadband component with superimposed narrowband components.

  • 371.
    Yang, Kai
    et al.
    Luleå tekniska universitet, Institutionen för teknikvetenskap och matematik, Energivetenskap.
    Bollen, Math
    Luleå tekniska universitet, Institutionen för teknikvetenskap och matematik, Energivetenskap.
    Wahlberg, Mats
    Luleå tekniska universitet, Institutionen för teknikvetenskap och matematik, Energivetenskap.
    Wind power harmonic emission versus active-power production2014Konferansepaper (Fagfellevurdert)
  • 372.
    Yang, Kai
    et al.
    Luleå tekniska universitet, Institutionen för teknikvetenskap och matematik, Energivetenskap.
    Bollen, Math
    Luleå tekniska universitet, Institutionen för teknikvetenskap och matematik, Energivetenskap.
    Yao, Liangzhong
    Alstom Transport Information Solution.
    Theoretical emission study of windpark grids: Emission propagation between windpark and grid2011Inngår i: Proceeding of the International Conference on Electrical Power Quality and Utilisation, EPQU, Piscataway, NJ: IEEE Communications Society, 2011, s. 559-564Konferansepaper (Fagfellevurdert)
    Abstract [en]

    This paper presents the results from a theoretical study on the harmonic emission of a windpark in the frequency range up to 200 kHz. The calculations are based on the transfer function from an individual turbine to the pubic grid, expressed in the frequency domain. The model has been applied to a general windpark, for which a mathematical expression has been derived. The study provides relations between different parameters in the windpark and the transfer functions. An important conclusion from the study is that emission into the public grid is negligible for frequencies above a few kHz.

  • 373.
    Yang, Kai
    et al.
    Luleå tekniska universitet, Institutionen för teknikvetenskap och matematik, Energivetenskap.
    Cundeva, S
    Bollen, Math
    Luleå tekniska universitet, Institutionen för teknikvetenskap och matematik, Energivetenskap.
    Wahlberg, Mats
    Luleå tekniska universitet, Institutionen för teknikvetenskap och matematik.
    Harmonic emission study of individual wind turbines and a wind park2013Inngår i: The Renewable Energies and Power Quality Journal (RE&PQJ), ISSN 2172-038X, E-ISSN 2172-038X, nr 11Artikkel i tidsskrift (Fagfellevurdert)
  • 374.
    Yang, Kai
    et al.
    Luleå tekniska universitet, Institutionen för teknikvetenskap och matematik, Energivetenskap.
    Cundeva, S.
    University Sts. Cyrill and Methodias, Skopje, Institute of Electroheat Faculty of Electrical Engineering and Information Technology.
    Bollen, Math
    Luleå tekniska universitet, Institutionen för teknikvetenskap och matematik, Energivetenskap.
    Wahlberg, Mats
    Luleå tekniska universitet, Institutionen för teknikvetenskap och matematik, Energivetenskap.
    Measurements of harmonic and interharmonic emission from wind power systems2014Inngår i: Russian Electrical Engineering, ISSN 1068-3712, Vol. 85, nr 12, s. 769-776Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    With increasing amounts of wind power connected, the power system is impacted in a number of ways. In this paper, the emphasis is on one of those impacts: the harmonic and interharmonic emission from wind-power installations. The emission of individual wind turbines as well as from a wind park has been studied. The spectrum as a function of active-power has been studied. Various trends of emission according to the output power have been presented. For four modern wind turbines estimations have been done on the impact on the grid for each harmonic and interharmonic subgroup. The primary emission from a complete windpark due to the emission from the turbines has been analyzed

  • 375.
    Yang, Kai
    et al.
    Luleå tekniska universitet, Institutionen för teknikvetenskap och matematik, Energivetenskap.
    Cundeva, Snezana
    Institute of Electroheat Faculty of Electrical Engineering and Information Technology.
    Bollen, Math
    Luleå tekniska universitet, Institutionen för teknikvetenskap och matematik, Energivetenskap.
    Wahlberg, Mats
    Luleå tekniska universitet, Institutionen för teknikvetenskap och matematik.
    Harmonic aspects of wind-power installations2013Konferansepaper (Fagfellevurdert)
    Abstract [en]

    With increasing amounts of wind power connected, the power system is impacted in a number of ways. In this paper, the emphasis has been on one of those impacts: the harmonic emission from wind-power installations. The harmonic emission of individual wind turbines as well as from a wind park has been studied. For four modern wind turbines estimations have been done on the impact on the grid per harmonic and interharmonic group. The primary emission from complete windpark due to the emission from the turbines has been analyzed.

  • 376.
    Yang, Kai
    et al.
    Luleå tekniska universitet, Institutionen för teknikvetenskap och matematik, Energivetenskap.
    Schwanz, Daphne
    Luleå tekniska universitet, Institutionen för teknikvetenskap och matematik, Energivetenskap.
    Bollen, Math
    Luleå tekniska universitet, Institutionen för teknikvetenskap och matematik, Energivetenskap.
    Harmonic aggregation and amplification in a wind-park2015Konferansepaper (Fagfellevurdert)
    Abstract [en]

    This paper studies the harmonic emission in a wind park,using a current transfer function. The emission of anindividual wind turbine has been measured during aperiod of a few weeks covering all output productions.The wind park harmonic emission is analyzed by theaverage spectrum at the collection point. The amount ofemission of the wind park as a whole is modeled by astochastic method, based on the Monte-Carlo Simulation.The measured harmonics at wind turbines have beenanalyzed and compared with the simulated overallemission at the collection point of the wind park. Theresults will be showed by graphs and some discussionswill be made.

  • 377.
    Yang, Yongtao
    et al.
    STRI AB.
    Bollen, Math
    Luleå tekniska universitet, Institutionen för teknikvetenskap och matematik, Energivetenskap.
    Considering a customer dissatisfaction index in the reliability of distribution networks with distributed energy resources2008Inngår i: Proceedings of the 10th International Conference on Probabilistic Methods Applied to Power Systems: PMAPS 2008, Piscataway, NJ: IEEE Communications Society, 2008, s. 1-8Konferansepaper (Fagfellevurdert)
    Abstract [en]

    This paper proposes a new design guideline for reliability improvement of distribution networks using distributed energy resource (DER). The proposed guideline is advised to maintain CDI values of all customers under a certain pre-defined threshold value. The impact of the switching devices failure on the reliability is also considered and proper corrections are made on various threshold values within the guideline, therefore the obtained results will also be valid when considering non-ideal switching devices. The simulation results show that the guideline produces reasonably good results. Furthermore the proposed correction method for the calculation of non-ideal switching devices is validated.

  • 378. Zavoda, Francisc
    et al.
    Bollen, Math
    Luleå tekniska universitet, Institutionen för teknikvetenskap och matematik, Energivetenskap.
    Rönnberg, Sarah
    Luleå tekniska universitet, Institutionen för teknikvetenskap och matematik, Energivetenskap.
    CIGRE/CIRED JWG C4.24, Power Quality and EMC Issues associated with future electricity networks: status report2016Konferansepaper (Fagfellevurdert)
  • 379.
    Zavoda, Francisc
    et al.
    IREQ/I-IQ Canada.
    Bollen, Math
    STRI - Sweden.
    Tremblay, Mario
    IREQ/I-IQ Canada.
    The behavior of power distribution feeder dips2009Inngår i: CIRED 20th International Conference on Electricity Distribution: (CIRED 2009) ; Prague, Czech Republic, 8 - 11 June 2009, Red Hook, NY: Curran Associates, Inc., 2009, artikkel-id 0346Konferansepaper (Fagfellevurdert)
    Abstract [en]

    This paper presents interesting results from a dip study that included events related to five distribution feeders with poor dip performance and one substation, which was supplying one of the feeders. Data stored in a SQL database was available for analysis and post treatment, with the following outcome: Statistics on recorded dips (type I, II and III) and short interruptions over one year period; Weather influence on dip behavior and statistics on dip occurred during stormy days and normal weather days; Sizing of SCADA system using dip and outage statistics Percentage of dips originating in transmission system among the dips recorded at substation and LV sites; Dip propagation from substation bus bars to the end of the feeder.

  • 380.
    Zavoda, Francisc
    et al.
    IREQ (HQ), Varennes.
    Langella, Roberto
    Second University of Naples.
    Lǎzǎroiu, George Cristian
    University Politehnica of Bucharest.
    Bollen, Math
    Luleå tekniska universitet, Institutionen för teknikvetenskap och matematik, Energivetenskap.
    Rönnberg, Sarah
    Luleå tekniska universitet, Institutionen för teknikvetenskap och matematik, Energivetenskap.
    Meyer, Jan Christian
    Technische Universitaet Dresden.
    Ciufo, Philip
    University of Wollongong.
    Power Quality in the Future Grid: Results from CIGRE/CIRED JWG C4.242016Inngår i: 2016 17th International Conference on Harmonics and Quality of Power, Piscataway, NJ, 2016, s. 931-936, artikkel-id 7783475Konferansepaper (Fagfellevurdert)
    Abstract [en]

    This paper gives a status report on activities of CIGRE/CIRED JWG C4.24. The following issues are addressed in the paper: Introduction, scope of the report and terminology; New developments in power electronics (PE); Changes in probability of interference; Microgrids and PQ; Volt-VAR control and PQ; Feeder reconfiguration and PQ; Demand side management and PQ; New measurement techniques; New mitigation.

  • 381.
    Zavoda, Francisc
    et al.
    IREQ.
    Rönnberg, Sarah
    Luleå tekniska universitet, Institutionen för teknikvetenskap och matematik, Energivetenskap.
    Bollen, Math
    Luleå tekniska universitet, Institutionen för teknikvetenskap och matematik, Energivetenskap.
    Meyer, Jan
    Technical University Dresden.
    Desmet, Jan
    Ghent University.
    CIGRE/CIRED/IEEE working group C4.24 - New measurement techniques in the future grid2015Konferansepaper (Fagfellevurdert)
    Abstract [en]

    One of the issues that the joint working groupCIGRÉ/CIRED/IEEE JWG C4.24 will be addressing, isthe need in future networks for new measurementtechniques, more complex and more accurate, which willbe undergoing architecture reconfiguration (due tofeeder reconfiguration) and will be witnessing old andnew phenomena affecting the power quality. This papergives a comprehensive overview and betterunderstanding of the real challenges related tomeasurement techniques in future networks

  • 382.
    Zheng, Ruimin
    et al.
    University of Hongkong.
    Bollen, Math
    Luleå tekniska universitet, Institutionen för teknikvetenskap och matematik, Energivetenskap.
    Harmonic resonances associated with wind farms2010Rapport (Annet vitenskapelig)
  • 383.
    Zheng, Ruimin
    et al.
    Department of Electrical and Electronic Engineering, University of Hong Kong.
    Bollen, Math
    Luleå tekniska universitet, Institutionen för teknikvetenskap och matematik, Energivetenskap.
    Zhong, Jin
    STRI AB.
    Harmonic resonances due to a grid-connected wind farm2010Inngår i: 14th International Conference on Harmonics and Quality of Power (ICHQP), Piscataway, NJ: IEEE Communications Society, 2010, s. 1-7Konferansepaper (Fagfellevurdert)
    Abstract [en]

    This paper studies the impact of a grid-connected wind farm on the harmonic resonances. The basic theory on the harmonic resonances is introduced as well as its consequences. The models of wind farm for resonance analysis are presented for both calculations and simulations. The resonance orders and amplifications of voltage distortion with different capacity of capacitor banks are studied under different operation modes. Several case studies with a 200 MW wind farm have been carried out to illustrate the methods for harmonic resonance analysis. 

  • 384.
    Zhong, Jin
    et al.
    Luleå tekniska universitet, Institutionen för teknikvetenskap och matematik, Energivetenskap.
    Bollen, Math
    Luleå tekniska universitet, Institutionen för teknikvetenskap och matematik, Energivetenskap.
    Wei, Ming
    The University of HongKong.
    Rönnberg, Sarah
    Luleå tekniska universitet, Institutionen för teknikvetenskap och matematik, Energivetenskap.
    Towards a 100% Renewable Energy Power Generation in Sweden2016Inngår i: Meeting Sweden's current and future energy challenges, Luleå: Luleå tekniska universitet, 2016, Luleå: Luleå tekniska universitet, 2016Konferansepaper (Annet vitenskapelig)
  • 385. Čundeva, S
    et al.
    Bollen, Math
    Luleå tekniska universitet, Institutionen för teknikvetenskap och matematik, Energivetenskap.
    Kokolanski, Ž
    Vuletić, J
    Krkoleva, A
    Immunity against voltage dips: main recommendations to stakeholders of the CIGRE/CIRED/UIE Joint Working Group C4.1102011Konferansepaper (Fagfellevurdert)
  • 386. Čundeva, S
    et al.
    Bollen, Math
    Luleå tekniska universitet, Institutionen för teknikvetenskap och matematik, Energivetenskap.
    Krkoleva, A
    Vuletić, J
    Kokolanski, Ž
    Djokić, S
    Improved understanding of compatibility issues regarding voltage dips: main contributions of the CIGRE/CIRED/UIE Joint Working Group C4.1102011Konferansepaper (Fagfellevurdert)
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