1、IEEE Std 1124-2003IEEE Standards1124TMIEEE Guide for Analysis and Definitionof DC Side Harmonic Performance ofHVDC Transmission SystemsPublished by The Institute of Electrical and Electronics Engineers, Inc.3 Park Avenue, New York, NY 10016-5997, USA5 September 2003IEEE Power Engineering SocietySpon
2、sored by theTransmission and b) Computing interference levels that would result with variouspractical dc filter/smoothing reactor designs and the costs of these filters.Keywords: equivalent disturbing current, filters, harmonic currents, harmonic voltages, HVDC transmission systems,induction, induct
3、ive coordination, interference, mitigation methods, mutual impedance, noise, telephone circuitsThe Institute of Electrical and Electronics Engineers, Inc. 3 Park Avenue, New York, NY 10016-5997, USACopyright 2003 by the Institute of Electrical and Electronics Engineers, Inc.IEEE Standards documents
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21、Center, Customer Service, 222 Rosewood Drive, Danvers, MA 01923 USA; +1 978 750 8400. Permission to photocopy portions of any individual standard for educational classroom use can also be obtained through the Copyright Clearance Center. Copyright C223 2003 IEEE. All rights reserved. iiiIntroduction(
22、This introduction is not part of IEEE Std 1124-2003, IEEE Guide for the Analysis and Definition of DC-SideHarmonic Performance of HVDC Transmission Systems.)The purpose of this document is to provide guidelines for evaluating and mitigating harmonicinduction eects from high-voltage direct-current (H
23、VDC) lines on the adjacent telephonecommunication lines. Specifically, this guide presents methodology and approach fora) Determining the number of wireline communication circuits that will be aected byunacceptable interference and cost-eective remedial measures.b) Computing interference levels that
24、 would result with various practical dc filter/smoothingreactor designs and the costs of these filters.ParticipantsAt the time this guide was completed, the IEEE Working Group on HVDC Harmonics, which wassponsored by the DC and FACTS Subcommittee of the Transmission however, statistical methodsand/o
25、r approximation are necessary in order to keep the number of computation cases for harmoniccurrent profiles on the dc transmission line to a reasonable level of eort.Copyright C223 2003 IEEE. All rights reserved. 11The numbers in square brackets correspond to those of the bibliography in Annex A.1.1
26、 ScopeThis guide contains information and recommendations pertaining to the analysis and specification ofthe performance on the dc side of a high-voltage direct-current converter station concerning theelectrical noise at harmonic frequencies up to 5kHz generated by converter stations in a dctransmis
27、sion system. This guide also contains information and suggestions pertaining to measurementof dc filter performance and noise level induced in wireline communications circuits from harmoniccurrents on dc transmission lines.1.2 PurposeInductive coordination studies for dc transmission lines have two
28、basic aspects:a) Determination of the number of wireline communication circuits that will suer unacceptableinterference and the costs that would be involved in remedial measures applied to the aectedwireline communication circuits.b) Computation of interference levels that would result with various
29、practical dc filter/smoothingreactor designs and the costs of these filters.The optimum solution can be obtained by a cost/performance study. A substantial part of the workinvolves identifying all wireline communication circuits in the vicinity of planned dc transmission linesand calculating probabl
30、e levels of induced interference for each circuit. These calculations are tediousand time-consuming, even using available computer programs, due to the detailed calculationsinvolved and determining the exact parameters of each exposure. This can be further complicated bychanges to the dc transmissio
31、n line route (due to factors involved in finalizing the dc line right-of-way),which changes the wireline communication circuit exposures to be analyzed; changes in dc filterdesigns producing changes in harmonic current profiles on the dc transmission lines; diculties inreaching agreement between pow
32、er and telephone companies on limits of allowable inducedinterference; and short dc project construction schedules.Reaching an optimum solution can be a lengthy, iterative process. Each dc project is unique, so that asolution used previously on a similar dc transmission project is not necessarily th
33、e optimum solutionfor the dc project under study. However, by using a simple, systematic approach to the problem and byselecting boundaries to the variation of each relevant operating parameter, the required studies can bestarted early in the project and a satisfactory conclusion reached relatively
34、quickly.One approach (Patterson and Fletcher B18) involves de-coupling the calculation of dc filtercharacteristics and harmonic current profiles on the dc transmission line (the power system analysis)from the calculation of coupling factors at harmonic frequencies between the dc transmission line an
35、deach adjacent wireline communications circuit due to harmonic currents on the dc transmission line(the communications system analysis).2. ReferencesWhen the following standards are superseded by an approved revision, the revision shall apply.IEEE Std 1137TM-1991 (Rea 1998), IEEE Guide for the Imple
36、mentation of Inductive CoordinationMitigation Techniques and Applications.2,32 Copyright C223 2003 IEEE. All rights reserved.2The IEEE standards or products referred to in Clause 2 are trademarks owned by the Institute of Electrical and ElectronicsEngineers, Inc.3IEEE publications are available from
37、 the Institute of Electrical and Electronics Engineers, Inc., 445 Hoes Lane, P.O. Box 1331,Piscataway, NJ 08855-1331, USA (http:/www.standards.ieee.org/).IEEEStd 1124-2003 IEEE GUIDE FOR THE ANALYSIS AND DEFINITION OF3. Explanation of terms3.1 DC harmonicsThis term refers to the ac harmonic content
38、of the dc voltage or current of an HVDC system, as definedin The Authoritative Dictionary of IEEE Standards Terms, Seventh Edition B8. In an ideal bridgeconverter, the dc voltage harmonics have frequencies of only even multiples of the fundamentalfrequency at characteristic frequencies; however, in
39、practice other even and odd multiples offundamental frequency (at noncharacteristic frequencies) can also appear due to system imbalancesand stray capacitances.3.2 Ideal converterAn ideal converter is considered to be a converter that has balanced sinusoidal voltage, circuitimpedances, firing angle,
40、 and no stray capacitance, and smooth dc current for purposes ofcommutation, etc.3.3 Harmonic orderThe order of a harmonic of the dc voltage/current is the ratio of its frequency to the fundamentalfrequency on the ac side of the converter.3.4 Characteristic/noncharacteristic harmonicsIn an ideal con
41、verter, the characteristic harmonics are those harmonics that are based on theoreticalwaveforms of dc voltage of a converter and can be expressed in terms of the pulse number of theconverter; for example, for a six-pulse converter, the harmonic order can be expressed as 6n, where n isan integer and,
42、 in general, the expression would be pn, where p is the pulse number. All otherharmonics not defined by such an expression are traditionally termed as noncharacteristic harmonics.Noncharacteristic harmonics usually are relatively small. However, for a practical converter, such adefinition is not app
43、licable, and a more precise approach is to express harmonics in terms of triplenand nontriplen harmonics (see 3.5).3.5 Triplen harmonicsTriplen harmonics are those harmonics that are multiples of the third harmonic; for example, 3, 6, 9,12, 15, . . . and can be classified as either odd or even. The
44、even triplen harmonics, which are multiplesof the converter pulse number (for example, 12, 24, . . . for a twelve-pulse converter), are the same ascharacteristic harmonics of an ideal converter and flow through the poles of the converter (pole modein a balanced system). However, due to imbalances in
45、 the poles, a residual even triplen harmoniccurrent may flow through a ground return path. Other triplen harmonics (odd and even) are zerosequence type and flow either through the ground mat or the neutral ground (refer to 5.6).Non-triplen harmonics are those harmonics that are neither multiples of
46、the third harmonic nor theconverter pulse number and can appear due to system or converter imbalances.3.6 Equivalent disturbing current (Ieq)Equivalent disturbing current (Ieq) is used to denote a single harmonic current at a reference frequency(usually 1000Hz for the 60Hz system) that would produce
47、 the same interference in a telephone line asproduced by all individual harmonics. The equivalent disturbing current takes into account the CCopyright C223 2003 IEEE. All rights reserved. 3IEEEDC-SIDE HARMONIC PERFORMANCE OF HVDC TRANSMISSION SYSTEMS STD 1124-2003message weighting factor (Cn) and a
48、frequency dependence factor (Hn) for mutual coupling to thetelephone line.3.7 Harmonic performanceThe term harmonic performance refers to the performance of the harmonic filtering system on the dcside in mitigating the flow of harmonic currents into the dc line. The harmonic performance may beexpres
49、sed in terms of the equivalent disturbing current (usually in mA) or the induced voltage in atelephone line (usually in mV/km), or in terms of the individual or total harmonic current levels. Thelatter method of specifying is not very commonly used in the U.S. and Canada. The specifiedperformance becomes the basis for the design of the dc harmonic filtering system.The harmonic performance is often specified separately for bipolar and monopolar modes ofoperation, since the monopolar operation is usually for only short duration and a relatively lowerperformance can be tolerated.3
