Session 2, III - Voltage dips and disturbances in customers installations Barcelona May 2003 Activities of Joint Cigré/CIRED/UIE Power Quality Working Group General Aspects Erich W. Gunther Electrotek Concepts, Inc – USA Convener Cigré C4.05/CIRED 2/UIE - CCU2

Session 2, III - Voltage dips and disturbances in customers installations Barcelona May 2003 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 Despite the voltage quality designation in the official name, we handle current also

Session 2, III - Voltage dips and disturbances in customers installations Barcelona May 2003 Cigré C4.05, CIRED 2, UIEPQ - CCU2 The CIRED power quality working group is a joint working group. Originally with Cigré (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

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

Session 2, III - Voltage dips and disturbances in customers installations Barcelona May 2003 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

Session 2, III - Voltage dips and disturbances in customers installations Barcelona May 2003 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

Session 2, III - Voltage dips and disturbances in customers installations Barcelona May 2003 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 as flicker meter standard – details being finalized IEEE (PQ measurements) and (characterization) being harmonized with

Session 2, III - Voltage dips and disturbances in customers installations Barcelona May 2003 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 requirements Harmonic meter test protocol based on nd Edition and requirements Request from IEC TC 77A to review harmonic compatibility levels

Session 2, III - Voltage dips and disturbances in customers installations Barcelona May 2003 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 –