activities of joint cigré/cired/uie power quality working group general aspects

Session 2, III - Voltage dips and disturbances in customers installations

Barcelona 12-15 May 2003

Activities of Joint Cigré/CIRED/UIE Power Quality Working Group

General Aspects

Erich W. GuntherElectrotek Concepts, Inc – USA

Convener Cigré C4.05/CIRED 2/UIE - CCU2



History & Scope of CCU2• In existence since 1977 as a “permanent” Cigré working group• Study of the low-frequency disturbances (harmonics, flicker,

unbalance and voltage dips) caused either by the loads or, sometimes, by the transmission and distribution systems themselves.

• Study methods of prediction and measurement of the corresponding parameters of these disturbances.

• Assessment of limit values of these parameters and corresponding values of probability.

• Maintain liaisons with other organizations concerned with similar studies – technology transfer is sometimes considered our most beneficial “product”. More than 2000 documents distributed within the working group since 1977.

• Despite the voltage quality designation in the official name, we handle current also



Cigré C4.05, CIRED 2, UIEPQ - CCU2

• The CIRED power quality working group is a joint working group. Originally with Cigré 36.05 (recently renamed C4.05) and was designated CC02. Three years ago, UIE PQ formally joined the group to create CCU2

• Three groups with common interest in power quality have joined forces with common members, meetings, and publications to maximize results and minimize overhead

• Meet 1 or more times per year• Last meetings in Düsseldorf and Brussels• Meet next week in Madrid. Next meeting at the joint

Cigré/IEEE symposium in October 2003



Diverse disciplines and expertise

• Voltage quality issues require expertise in many different technical areas.

• Consequently, CCU2 membership is large (52 members from > 20 countries) but with a core group of 10 or so who regularly attend meetings.

• Same members of CCU2 are also members of other power quality related organizations. Reality of limited travel budgets necessitates cooperation between groups and common meetings where possible.



Work in progress

• Flicker meter test/certification protocol• Extend UIE/IEC flicker meter specification to

cover 100 volt lamps (Japan)• Paper on worldwide flicker compatibility levels,

contract levels, practical levels, measured values, and actual experiences

• Paper on impact of utility deregulation on power quality

• UIE Guide Part 3: Harmonics



Coordination with other groups • CCU2 maintains a list of coordinating groups, their conveners, and

work underway to keep everyone informed

• Close coordination with IEC, IEEE and other groups via common membership

• IEC often requests CCU2 perform specific tasks

• New IEEE Power Quality Subcommittee formed under T&D Committee – most power quality related working groups moved there

• IEEE Power Quality Standards Coordinating Committee SCC-22 – new agreement between IEEE and IEC to appoint IEEE representative to each PQ related working group



Coordination Accomplishments• Interharmonics in Power Systems paper co-developed and

published with IEEE interharmonic task force• RMS variation indices and tabulation methods co-developed

with EPRI and various IEEE working groups• RMS variation indices work turned over to new Cigré working

group (C4.07) for additional work• IEC and IEEE SCC-22 have formal agreement to share

working documents between power quality groups and appoint IEEE representatives to IEC WG’s

• IEEE flicker task force has adopted IEC 61000-4-15 as flicker meter standard – details being finalized

• IEEE 1159.1 (PQ measurements) and 1159.2 (characterization) being harmonized with 61000-4-30



Future work

• Review flicker requirements specified in wind power standards, identify conflicts, make recommendations for resolution

• Request from IEC TC77A WG9 - Dip (sag) / swell / momentary interruption meter test protocol based on 61000-4-30 requirements

• Harmonic meter test protocol based on 61000-4-7 2nd Edition and 61000-4-30 requirements

• Request from IEC TC 77A to review harmonic compatibility levels



Conclusion

• There are still many power quality issues to understand and solve

• Pooling of technical resources necessary to maximize progress due to companies limited budgets for standards participation

• Distributed generation and utility deregulation creating new challenges for managing power quality and reliability

• CCU2 Web Site – http://www.ccu2.org/

activities of joint cigré/cired/uie power quality working group general aspects

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