Presentation on theme: "DEWETRON - Power Product Line"— Presentation transcript:
1 DEWETRON - Power Product Line PQ System installation and evaluation of Wind Power Plants in EuropeSeoulDr. Werner SchoefferDEWETRON GmbHParkring 4, A-8074 GrambachPhone:
2 Quality characteristics of Power V (220 V, 110V or different)2. AC - sinewave3. 50 (60) Hz4. 3 phases5. Availability
3 Reasons for PQM Electrical energy is an open market and the quality of theproduct has to be definedTQM (total quality monitoring) must also be done for this product.The user has the right to get a product which fits to the standard (EN50160)The supplier has to guarantee the quality.In judicial proceedings the prosecutor has to present the facts.
4 Situation TodayEnergy has been monitored since electrical energy has been distributed.The flow of active power and reactive power is known very well in most of the substations.Faults have been recorded by the use of paper recorders or in protection relays.Power quality has been measured in case of troubles.
5 Renewables are coming“Renewable Energy” are a lot of small power plants feeding into the grid.Sometimes they can control the voltage level.Voltage variations and Harmonics are coming up more and more because of electronic loads and decentralized power generation.
6 Standards and Regulations EN Voltage levels in public power gridsIEC harmonics measurementIEC flicker measurementIEC PQ measurement methodsIEC Measurement and assessment of power quality characteristics of grid connected wind turbines
7 EN 50160 EC-directive 85/374 – standardization of the product liabilty lawsElectricity became a productQuality characteristics for the productElectricity (voltage) have been usedEN 50160Customers can be sure, that the quality of their voltage supply is in any point of the supply grid, under normal conditions, at least conform to the EN 50160
21 EN (13)Telegram voltagesfrequency depending limit curve
22 When and where is EN 50160 valid ? Connection point public grid – customerLow voltage (400V)and medium voltage (1kV to 35 kV) systemsUnder normal operation conditionsNot after faults !New: application guide !
23 IEC ClassesClass A: This class is used where precise measurement is necessary, such as contractual applications that may require resolving disputes, verifying compliance with standards, etc. Any measurements of a parameter carried out by two different instruments complying with the requirements of class A, when measuring the same signals, will produce matching results within the specified uncertainty for that parameter.Class S: NEW “under construction”. This class is used for statistical applications such as surveys or power quality assessment, possibly with a limited subset of parameters. Although it uses equivalent intervals of measurement as used in class A, the class S processing requirements are much lower.Class B: This class may be used for quality surveys, trouble shooting applications and other applications when low uncertainty is not required.
24 Additional StandardsVoltage levels in customers grids (e.g. IEC )Emission levels of equipment (e.g. IEC x)Regulations for the connection of customers to public grids (e.g. TOR D2 in “D A CH CZ”)Special standards for renewable energy (e.g windmills)Environment for ITITIC, former CBEMA curveVoltage interruptionsUnipede statistics,SAIFI, SAIDI, CAIDI, etc.)
25 Europe All EC members have a regulatory body. They should get the PQ data from the grid companies.They will then summarice this data for average statistics.In Future grid tariffs will depend on the supply quality.
26 What is measured where ? 230 V (400 V) 20kV (or 30kV) 110kV 380kV Voltage variationsFlickerHarmonicsFrequencyInterharmonicsHigher Harmonics (2-9 kHz)Fault RecordingVoltage variationsFlickerHarmonicsFrequencyInterharmonicsFault RecordingFault RecordingHarmonicsFrequencyFault RecordingFrequency
27 Data to be collected (1) EN 50160 U rms frequency U harmonics (up to 25th)U interharmonicsTHD (total harmonicdistortion up to 40)unbalanceflicker (long term)voltage Dipsover-voltagesignal voltage
28 Data to be collected (2) Additional for Harmonics Harmonics up to 50 (for windmills up to 100)Flexible grouping methods of the bins (today: +/- 1 bin, old: only the base line)New in : Frequency groups between 2 to 9 kHz (200 Hz groups)
29 Data to be collected (3) Flicker requirements: Pst in 10 min Plt in 2 hFor both: sliding windows and adjustable intervals for service and adjustment workNew: flicker emission (current flicker)New: flicker direction
30 Data to be collected (4) Power measurement: Symmetrical components: P, Q, S, PFFundamental values P_h1, Q_h1, S_h1, Phi_h1Harmonics valuesDistortion power DSymmetrical components:Unbalance of the fundamentalPositive, negative and zero system of U and I
31 Reporting the Data (1) Diagrams: Min/Max/Average of the data row Comparing the data with limits(absolute and relative)Quantile values for 95%, 99%, 100%, any other value to be open for coming standards (e.g. EN50160)Different limits for different quantile valuesHistogram curves in different stylesStatistical values like MOD, VAR, STDDEV, etc.Energy lines (Energy consumption as time line)Sorted data lines (e.g. of power for energy management)Individual mathematical analysis of data lines
32 Reporting the Data (2) FFT: Standard FFT FFT with limits Limits user definableFFT with selectable number of bins(e.g. old IEC )Frequency bands (e.g.FFT of voltage (phase and line), currentFFT of power, reactive power incl. sign
33 Reporting the Data (3) Faults: List of transients Transient curves Evaluated transients = events (duration and height)DISDIP statisticsCBEMA / ITIC curveCombined diagrams and statisticsIndividual mathematical analysis of transientsFFT of transients
34 Reporting the Data (4) What else ? Report Generator Topologic View Support
35 Renewable Energy Renewable Energy: Wind power plants Photopholtaic … Own PQ rules and needs
36 Wind Power Plants What makes wind mill measurements special ? 1. Parameters of EN50160:connecting wind farms to thepublic grid2. Parameters of :type testing of wind mills
38 Example BewagThey need to monitor the Quality in their whole grid (Regulation rules)Different needs for differentvoltage levels and windparks110 kV: Faultrecording, voltage recording…20 kV: PQ according EN50160, power, …Wind: 20 kHz bandwidth, parameters ofIEC , Flicker, Flickeremission…
39 Wind: IECTesting (comissioning) of PQ parameters of a wind mill and wind farmsHarmonicsFrequency HzPower pins for different windspeedFlicker emission
40 Tests of 61400-21 Parameters at different Wind speed From cut in wind speed to 15m/s in steps of 1FlickeremissionFlickercoefficientParameters at different Power pins10%,20%,…80%,90%,100% P NennMax of P, Q, PF (200ms, 1min, 10min)Max Harmonics of currentsMax Interharmonics of currentsMax HF of currents (higher harmonicsVoltage VariationsBehaviour of wind mill
42 Grid Connection Wind farms in Austria and Europe Typical grid connection
43 Grid Connection of Wind farms At the beginning:Single wind mills in MV gridWind power was growingTroubles with voltage varations and flicker came upSolutionCombining wind mills to wind parksBringing power more to „higher short circuit power“
44 Austria and WindfarmsMost of the wind power is here (~1 GW)
46 Grid Connection of Wind farms Typical size of Wind mill: 2 MWTypical Wind farm: 10 mills = 20 MWEastern Austria: several wind farmsSingle Wind mills: directly connected to MV distribution cable (typ. 20 kV)Wind farms: directly on MV transformerMore Wind farms: have an own 20 kV/110kV transformerLoad balance with hydro power pump stations on 380 kV level
47 Load Balancing Hydro Power Pump Stations for Load Balancing in the mountains380kV
49 Conclusions PQ monitoring is a must in the future. It is still to define how common reports and procedures shall look alike.The requirements differ from case to case and different instruments can deliver different data.Combined instruments which can give PQ data, fault data, energy flow, etc. seem to be the future.Central servers that provide the data to different departments will be used.Completely automated data exchange between the grid company, the regulatory body and the customer is from the technical point of view possible but requires more defined data formats and reporting types.Renewables require special measurements and monitoring.The producers of these instruments are well prepared for this challenge.
50 DEWETRON - Power Product Line Thank you for your attentionSeoulDr. Werner SchoefferDEWETRON GmbHParkring 4, A-8074 GrambachPhone: