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Harmonics and Quality of Power (ICHQP), 2012 IEEE 15th International Conference on

Date 17-20 June 2012

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Displaying Results 1 - 25 of 162
  • Author's index

    Publication Year: 2012 , Page(s): 1 - 5
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  • 1984-2012 [back cover]

    Publication Year: 2012 , Page(s): 1
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  • Welcome from conference co-chairs

    Publication Year: 2012 , Page(s): 1
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    A very warm welcome to all of you at the 15th International Conference on Harmonics and Quality of Power! Since its inception in 1984, this conference has been offering a unique platform for exchange and sharing of views and experiences among global power quality researchers and practitioners. This 15th version will continue the tradition. As the first ICHQP conference held in an Asian location, it will serve as a great forum for bringing together the western and eastern power quality research communities. View full abstract»

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  • Organizing committee

    Publication Year: 2012 , Page(s): 1 - 2
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  • [Front cover]

    Publication Year: 2012 , Page(s): c1
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  • [Title pages]

    Publication Year: 2012 , Page(s): 1 - 2
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  • Keynote speech [and additional back matter]

    Publication Year: 2012 , Page(s): 1 - 7
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  • A novel harmonic reduction technique for controlled converter by third harmonic current injection

    Publication Year: 2012 , Page(s): 84 - 92
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (4381 KB) |  | HTML iconHTML  

    Three-phase controlled converter has many applications in interfacing renewable energy sources and adjustable speed drives as a rectifier or inverter. The utility line currents of this converter have high harmonic distortion more than the harmonic standards. This research introduces a new technique of circulating third harmonic currents from dc-link to the line currents to reduce its harmonic contents. The new proposed system uses single-phase controlled converter to control the angle of injection current for each firing angle of the three-phase converter. A detailed analysis is introduced to achieve a relation between the firing angles of three and single-phase controlled converters. Also a detailed design for other injection path components is introduced. A simulation and experimental work is introduced to prove the mathematical derivations. Analysis, simulation and experimental results prove the superiority of the proposed technique. View full abstract»

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  • Continuity of supply and voltage quality in the electricity network of the future

    Publication Year: 2012 , Page(s): 375 - 377
    Cited by:  Papers (1)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (525 KB) |  | HTML iconHTML  

    This paper introduces three examples of new thinking for addressing the challenges that the power system has to cope with. Such new thinking in combination with new technology will be an important element in the transition to the future electricity network (the "smart grid"). With overload protection it is important to not remove the overloaded component but the cause of the overload so as to protect the other network users against an interruption. The limits set to the hosting capacity by potential overvoltages can be removed either by new technology (curtailment of production) or by allowing occasional overvoltages. Allowing higher levels of non-characteristic harmonics is a possible alternative for strict emission limits on new installations. In all cases it is essential that the interests of the network user are considered. View full abstract»

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  • Voltage quality monitoring, dips classification and responsibility sharing

    Publication Year: 2012 , Page(s): 926 - 931
    Cited by:  Papers (4)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (819 KB) |  | HTML iconHTML  

    The CEER and EURELECTRIC cooperation in the field of quality of electricity supply, involving joint meetings and the participation at the relevant CENELEC Technical Committee, contributed to the results attained in the recent publication of the EN 50160:2010 edition that includes a new voltage dips classification table allowing harmonisation at European level on voltage dips data collection. The generalisation of voltage quality monitoring data publication all over Europe will allow the definition of responsibility sharing between the different involved stakeholders and the evolution of voltage quality regulation applied at national level. Examples from Sweden and Italy are briefly presented in this paper. View full abstract»

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  • Comparison of harmonic emissions at two nodes in a windpark

    Publication Year: 2012 , Page(s): 313 - 319
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (2358 KB) |  | HTML iconHTML  

    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. View full abstract»

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  • Propagation mechanisms research of harmonics produced by distributed generations in distribution network

    Publication Year: 2012 , Page(s): 774 - 777
    Cited by:  Papers (1)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (618 KB) |  | HTML iconHTML  

    In this paper, models of distributed generations and distribution network are built in MATLAB and simulation results under several cases are given. An equivalent mathematical model at access point of distributed generation is built, based on which, the propagation mechanisms of harmonics produced by distributed generations in distribution network is analyzed. It is concluded that THDi may be no more suitable for harmonic evaluation in distributed network containing distributed generations. This paper provides some reference value for analyzing and managing harmonics. View full abstract»

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  • Information extraction from PQ disturbances — An emerging direction of power quality research

    Publication Year: 2012 , Page(s): 649 - 655
    Cited by:  Papers (2)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (710 KB) |  | HTML iconHTML  

    Power quality is a field that deals with all sorts of power disturbances. Past power quality research and development activities have been focused on the harmful aspects of the disturbances. With the wide spread use of power quality monitoring tools, more and more users and developers start to realize that power disturbances can carry valuable information about the conditions of a system and its equipment. As a result, initiatives that explore the “useful” aspects of power disturbances have emerged. For example, short-circuit caused voltage sag disturbances have been exploited for fault location purposes, characteristics of capacitor-switching transients are used to determine and locate which feeder capacitors are operating normally. Such information-oriented use of power disturbance data and monitoring techniques could emerge as an important field of the future smart grid. The objective of this paper is to present some of the example developments in this interesting field. We hope this survey/review paper will help to stir up broader research interests in the field and serves as a step stone for PQ disturbance researchers. View full abstract»

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  • Control strategies for microgrid power quality enhancement with back-to-back converters connected to a distribution network

    Publication Year: 2012 , Page(s): 384 - 389
    Cited by:  Papers (1)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (2376 KB) |  | HTML iconHTML  

    Microgrid with non-linear and unbalanced loads experiences power quality problems such high total harmonic distortion (THD) and unbalanced voltages. The paper proposes a compensation and control strategies to eliminate the influence of non-linear and unbalanced loads on microgrid and the utility grid that connected. Based on instantaneous power in d-q reference frame, the reference compensation current for voltage source converter (VSC) is generated using the difference between instantaneous currents at distribution network and load sides. Load sharing methods and control strategies for distributed generators under two operation modes of microgrids have been discussed. A back-to-back converter is applied to eliminate the unbalanced voltage disturbance to utility grid. The inverse droop control is proposed to achieve seamless transformation from one operating mode to another, and to automatically share load among DGs in the islanded mode. The simulation results obtained in the PSCAD/EMTDC software verify the effectiveness of the proposed control and compensation strategies. View full abstract»

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  • Harmonics from a domestic customer with different lamp technologies

    Publication Year: 2012 , Page(s): 585 - 590
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (1141 KB) |  | HTML iconHTML  

    This paper presents the results of a set of measurements to study changes in harmonic emission from a domestic customer due to the introduction of energy-efficient lamps (CFL and LED lamps). This emission has been studied through both magnitude and complex harmonic current. We can see that the emission depends on the lamps that are connected as a background. Sometimes adding a new device reduces the harmonic sometimes it increases it. The harmonic current produced by aggregate loads is significantly smaller than the algebraic sum of the harmonic current produced by each one separately. Therefore, it can be some cancellation effect not only between devices, but also among customers. Overall, the measurements confirm the conclusion that there is some increase in harmonic emission due to the replacement of incandescent lamps by CFLs and LED lamps, but that there is no reason for concern. View full abstract»

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  • A harmonic-based approach for open-neutral fault detection in low voltage systems

    Publication Year: 2012 , Page(s): 53 - 58
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (1604 KB) |  | HTML iconHTML  

    In three-phase four-wire low voltage systems supplying unbalanced loads, open neutral fault may lead to serious overvoltage at the feeder terminal because of neutral potential shift, in turn damage appliances and even cause fire. Nowadays, all open-neutral fault detection devices have to be installed close to the loads or at feeder terminal, which results in higher cost and maintenance issues. A new detection approach is proposed in the paper. By using it, the detection device can be simply installed at the feeder head, even the feeder supplies for multiple loads. Main idea of the proposed approach is that the fault can be identified according to the 3rd harmonic variation measured at the feeder head since the 3rd harmonic current shall vary significantly when open neutral fault occurs. Analysis on harmonic characteristics of open neutral fault, factors impacting validity of proposed approach and simulation results are presented in this paper. View full abstract»

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  • A new technique to detect faults in de-energized distribution feeders

    Publication Year: 2012 , Page(s): 64 - 69
    Cited by:  Papers (1)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (1689 KB) |  | HTML iconHTML  

    To ensure a safe re-energizing of an overhead distribution feeder after it is de-energized for an extended period, a novel fault detection technique by controlling a thyristor based device is proposed in this paper. The proposed method involves injecting a thyristor-generated controllable signal into the de-energized feeder. The feeder voltage and current responses are analyzed to determine if a fault still exists. A thyristor gating control strategy and fault detection algorithm is also proposed in this work to detect all possible types of faults that can happen in a system. Furthermore, to distinguish a stalled motor or a capacitor bank from a fault, an algorithm based on analysis of the harmonic impedance of the de-energized system is also developed. The effectiveness of the proposed method has been verified through theoretical analysis, computer simulations and lab tests. View full abstract»

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  • Fryze's power definition: Some limitations

    Publication Year: 2012 , Page(s): 518 - 522
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    This paper advocates the concept that a power theory that is in harmony with the physical laws must be based on Maxwell's equations. This claim is mathematically proven by analyzing the energy conversion mechanism that governs an induction motor performance. This study shows that the Poynting Vector theory leads to a practical apparent power resolution that supports the definitions given in the IEEE Std. 1459 - 2000. View full abstract»

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  • A European Benchmarking of voltage quality regulation

    Publication Year: 2012 , Page(s): 45 - 52
    Cited by:  Papers (2)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (1019 KB) |  | HTML iconHTML  

    The Council of European Energy Regulators has been publishing Benchmarking Reports on the Quality of Electricity Supply since 2001. For the 2011 edition of the Benchmarking Report the 29 member countries of CEER were joined by the 9 NRA's from the Energy Community and the NRA from Switzerland. This paper contains the main results, findings and recommendations on voltage quality from the 2011 edition. View full abstract»

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  • Harmonic planning levels in New Zealand medium voltage networks

    Publication Year: 2012 , Page(s): 569 - 572
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (1287 KB) |  | HTML iconHTML  

    Recently Power Quality Guidelines have been produced for the Electricity Engineers' Association of New Zealand. Among the various power quality issues, this paper specifically presents the development of voltage harmonic planning levels in the medium voltage networks by applying the concept of voltage droop. These planning levels are used to determine how much harmonic current can be allocated to a customer. These levels are shown to be comparable with values from international standards. View full abstract»

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  • Voltage dip immunity of equipment and installations - messages to stakeholders

    Publication Year: 2012 , Page(s): 915 - 919
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    This paper presents the messages to the stakeholders on voltage-dip immunity as extracted by UIE WG2 from CIGRE TB412. The paper summarizes the main recommendations from this technical brochure in the form of messages towards regulators, standard-setting-organizations, network operators, industrial customers, equipment manufacturers, and power quality monitor manufacturers, researchers. View full abstract»

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  • Requirements for a modern PQ and DFR monitoring system - PQ monitoring case study in Portugal

    Publication Year: 2012 , Page(s): 809 - 815
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (1642 KB) |  | HTML iconHTML  

    There are many manufacturers around the world providing power quality (PQ) monitoring and digital fault recording (DFR) solutions. Different monitoring requirements, monitoring practices, and new standardization make for a diverse range of available solutions. The first section of the paper will summarize the requirements and challenges of a modern PQ and DFR monitoring system. The second section will be a case study about the Qualitrol and Qenergia' systems implemented in Portugal, particularly at EDP and REN; it will show what has been done. Until IEC 61000-4-30 was introduced in 2003 many power quality parameters were not well defined leading to situations where different instruments produced different results. In 2008 Edition 2 was introduced and Edition 3 is now in progress. As well as considering 61000-4-30, this paper will summarize the key requirements of the new upcoming IEC 62586 product standard for power quality monitoring devices. In the second section of the paper we will present how to manage grid measuring points whose characteristics change over time, rather than just manage a fleet of measuring instruments. We will discuss the way to make compatible different types of measurement devices, access different data sources, handle the standards changes both in the limit values and in the way values are calculated and validate PQ and event data. Different ways of representing power quality information will also be addressed. Presenting information and not just raw data from the monitoring system is essential for efficient management of reports for regulatory and third party use. The Qualitrol and Qenergia's systems at EDP and REN have been developed to suit existing communication infrastructure, automatic and manual data retrieval and integrate in a single software analysis package, in a multi-vendor way, already existing older PQ devices together with new instruments. Combining PQ and DFR data also leads to efficiencies when collecting and analyzing - esults. View full abstract»

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  • Harmonic impedance measurement on submarine cable

    Publication Year: 2012 , Page(s): 564 - 568
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    The lumped equivalent circuit parameters and distributed parameters of a line at high frequency are a little different from those at power frequency, because of distribution effects. The paper derives the formulas to get the lumped equivalent circuit parameters and distributed parameters from open circuit and short circuit harmonic impedance, and the actual measurement was carried out on a three phases of 500kV single-core submarine cables. The line parameters at harmonic frequency are also calculated and compared with the actual measurement. Some phenomena is expecting further exploration. View full abstract»

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  • Harmonic summation and assessment based on probability distribution of phase angle

    Publication Year: 2012 , Page(s): 581 - 584
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (1047 KB) |  | HTML iconHTML  

    At the point of common coupling (PCC), the summation of two harmonic voltage vectors at same frequency is only certain if their amplitudes and phase angles are well known. Therefore, there are many cases where the phase angle difference between harmonic voltage vectors is unknown. In practice, for example, in calculating the steady state rating of the a.c. passive harmonic filter, arithmetic summation method is often used in determining maximal harmonic level. This summation law is very conservative as it may result in high cost of equipment ratings. Actually, a compromise should be made in taking into account the equipment safety and the risk of overrating as well as excessive costs. Based on uniform distribution of difference in phase angles, the paper provides an algorithm to calculate the probability upon which the magnitude of summation vector of two harmonic voltages may exceed a given value. On the basis of the probability and the given harmonic value, harmonic summation can be assessed. This may also result in a recommendation of another harmonic summation method for the standard IEC/TR 61000-3-6. View full abstract»

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  • A Calibration test prototype of flickermeter for wind turbines

    Publication Year: 2012 , Page(s): 29 - 33
    Cited by:  Papers (1)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (732 KB) |  | HTML iconHTML  

    Voltage fluctuations caused by the rapid changes of loads in the power system may give rise to noticeable illumination flickers of lighting equipments. Evaluation of voltage fluctuation becomes an important issue for the grid integration of wind energy systems. To provide accurate estimation of grid situations, a calibration test prototype is designed in this paper to assess the capability of commercial flickermeters. In accordance with the latest International Electrotechnical Commission (IEC) standards, the test power signals can be generated and the standard flicker indices can be precisely obtained by designed autoregressive (AR)-model-based synchronization and voltage envelope extraction processes. In this way, the commercial flickermeters can be conveniently calibrated to meet the measurement requirements during the continuous operation of wind turbine. View full abstract»

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