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CIGRE JWG 36.07 / CIRED Power Quality Indices and Objectives

CIGRE JWG 36.07 / CIRED Power Quality Indices and Objectives. Progress report on joint Cigré 36.07 / Cired Germain Beaulieu, conv . February 2003. JWG36.07: Power Quality indices & objectives. CONTENT: Scope Main activities

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CIGRE JWG 36.07 / CIRED Power Quality Indices and Objectives

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  1. CIGRE JWG 36.07 / CIREDPower Quality Indices and Objectives Progress report on joint Cigré 36.07 / Cired Germain Beaulieu, conv. February 2003

  2. JWG36.07: Power Quality indices & objectives CONTENT: • Scope • Main activities • Status of the work within the working group for: -harmonics, -flicker, -unbalance, -voltage dips and-interruptions. • Future activities

  3. JWG36.07: Power Quality indices & objectives Scope: • JWG formed 2 years ago (July 2000), duration 2-3 years. • Starting point is the evaluation of IEC 61000-3-6 and 7 concerning harmonics and flicker : suitability of the proposed objectives and extend the same approach to unbalance. • Additionally JWG also consider indices for voltage dips (objectives for these were not seen as part of the scope). • Indices for interruptions are also being addressed by the WG. • The voltage levels under consideration by the working group are MV, HV and EHV. • An important part of the JWG activities is to collect measurement data on actual levels of disturbances.

  4. JWG36.07: Power Quality indices & objectives Deliverables: • Recommended internal quality objectives, enabling to determine emission limits for disturbing installations • Recommended external quality objectives, to be presented to regulators and system users • Message for manufacturers of quality monitoring instruments: we need instruments which fulfill the IEC 61000-4-30 requirements, and which can give us the quality indices related to the internal and external objectives.

  5. JWG36.07: Power Quality indices & objectives Membership : 19 regular and 10 corresponding (*) members G. Borloo (BE) secr., G. Beaulieu (CA) conv.

  6. JWG36.07: Power Quality indices & objectives MAIN ACTIVITIES: Four main activities corresponding to the structure of the working document: • Part 1: Review existing indices and objectives. • Part 2: Collect measurement data. • Part 3: Recommend quality indices. • Part 4: Recommend quality objectives. For each part, harmonics, flicker, unbalance, dips and interruptions are addressed.

  7. JWG36.07: Power Quality indices & objectives Work Progress : Part 1: Review of existing standards and guidelines completed for harmonics, flicker, unbalance and dips. Part 2: Important efforts for collecting PQ measurement data. Difficulties in gathering data measured in a common or consistent manner. System wide surveys are rare, and confidentiality concerns. Work will be completed based on what was collected so far. Part 3: Discussions/contributions started on recommended indices and methods for assessing and reporting site/system indices. Part 4: Discussions starting on recommended objectives.

  8. JWG36.07: Power Quality indices & objectives ACTIVITIES IN 2003 : Jan. 2003: Prepare 5th draft working document. Finalize paper for Cired 2003. Feb. 2003: 6th meeting in Milano (IT) to discuss 5th draft : finalize part 1 and 2 and supplement part 3 and 4. Mar. 2003: Prepare 6th draft + prepare paper for Cigre/IEEE Symposium in Montreal in Oct. 2003. June 2003: 7th meeting in Essen (DE) to discuss 6th draft : finalize part 3 and 4. Oct. 2003: 8th and last meeting of JWG36.07 in Montreal (CA) Finalize the JWG report.

  9. JWG36.07: Power Quality indices & objectives • Harmonic distortion site indices: 95% or 99% of 3-s or 10-s value system index: 95% or 99% of site index • Objectives planning level: 2% for 5th harmonic (HV) • Data collection 2 MV, 7 HV and 2 EHV surveys (669 sites) • Conclusions planning level is exceeded too often for HV lack of data for MV and EHV

  10. JWG36.07: Power Quality indices & objectives • Flicker pst (10 min) and plt (2 hours) site index: 95% plt or 99% pst system index: 95% plt of 99% pst • Objectives planning levels: pst 0.8-0.9; lst: 0.6-0.7 • Conclusions flicker significantly exceeds planning levels system wide surveys are very uncommon transfer to LV need to be considered

  11. JWG36.07: Power Quality indices & objectives • Voltage Dips Site indices: number of dips per year System indices: 95% of site indices • Data collection 6 EHV, 5 HV, 4 MV surveys (748 mon-years) • Conclusions consistent monitoring methods are needed large variation among sites and systems not possible to give objectives

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