Understanding and managing harmonics and supraharmonics in modern electricity networks

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Date:21. - 22.05.2024
Aim of the course:Network operators all over the word face increasing challenges to integrate more and more modern power electronic equipment, like photovoltaic inverters, electric vehicle chargers, LED lighting or battery storage systems into their grids. Due to energy efficiency policies, most of that equipment utilizes switching frequencies above 2 kHz, which results in growing distortion levels in the frequency range 2-150 kHz (supraharmonics). On the other hand, their impact on harmonics below 2 kHz remains still important. For a holistic view, not only emission, but also the impact on the network impedance characteristics (i.e. resonances) has to be considered.
Target group:Industry engineers, researchers, students
Topics:1. Fundamentals
• Disturbance mechanism, characterization and responsibilities
• General interference mechanisms and electromagnetic compatibility
• Mathematical basics (frequency domain, sequence domain)
• Determination of short-circuit impedance
2. Standardization
• Needs, committees (IEC), legal background
• Principles of EMC coordination
• EMC standards series IEC 61000
• Product standard EN 50160 (Europe)
• Activities in CIRED, CIGRE and at European energy regulators
3. Measurement aspects
• Measurement methods and indices (i.a. IEC 61000-4-7)
• Measurement uncertainty (including transducers)
• Objectives for grid measurements
• Design criteria for measurement campaigns
• Advanced data analysis approaches
4. Harmonics (1)
• Power definitions under non-sinusoidal conditions
• Typical sources
• Summation of multiple sources
• Propagation in the network
4. Harmonics (2)
• Network harmonic impedance and resonances
• Modelling and simulation techniques
• Calculation of emission limits for customer installations
• Evaluation of contribution of a customer installation
5. Interharmonics
• Definitions, typical sources and effects
• Propagation in the network
6. Supraharmonics
• Definitions, typical sources and effects
• Emission characteristics and interference paths
• Summation of multiple sources
7. Case studies
• Supraharmonic resonance in an LV network with fast charging station
• Harmonic emission of a fast charging infrastructure with storage for peak shaving
• Measurement-based assessment of harmonic emission of an industrial customer connected to the LV network
• Impact of passive filter placement on harmonic impedance in transmission systems (simulation-based)
• Measurement-based identification of network harmonic impedance and harmonic propagation in a 400-kV-network
8. Example calculation
• Evaluation of harmonic voltage disturbances caused by EV charging
• Implementation of simplified harmonic model of network
• Implementation of simplified harmonic model of EV chargers
• Calculation of disturbance level at the connection point (with/without background distortion)
9. Further challenges
• Impact of increasing amount of power electronic based generation
• Harmonic stability related to inverter-based generation
• Unbalance caused by high-power single-phase equipment
Study results:1. Understanding on harmonics, interharmonics and supraharmonics from a power systems perspective with special focus on the impact of modern equipment;
2. Knowledge on EMC coordination concept, principles of harmonic limit allocation and the present status of IEC standardization;
3. Knowledge on different aspects of harmonic and supraharmonic measurements in the field from a practical viewpoint, including measurement uncertainty, design aspects of measurement campaigns and approaches for data analysis;
4. Understanding main sources of harmonic and supraharmonic emission along with their interaction (summation) and propagation in the network;
5. Understanding on case studies related to recent challenges and interference phenomena in distribution and transmission systems.
Learning outcomes:Engineering, manufacturing and construction
Course language:in English
Volume:lectures: 16 academic hours
Graduation document:TalTech certificate
Lecturer:Prof Jan Meyer PhD
Contact:Jako Kilter, jako.kilter@taltech.ee; Kätlin Reisberg, katlin.reisberg@taltech.ee (general inquiry and invoicing)
Price:1000 EUR + VAT / participant
Remarks about the price:Participants from industry: 1000 EUR + VAT
Participants from academy: 500 EUR + VAT
Participants invovled with COSPACT project: free of charge
Registration start:08.03.2024 09:00
Registration deadline:05.06.2024
Timetable:
Tallinn University of Technology, Ehitajate tee 5
21.05.2024
08:30 - 10:001. Fundamentals • Disturbance mechanism, characterization and responsibilities • General interference mechanisms and electromagnetic compatibility • Mathematical basics (frequency domain, sequence domain) • Determination of short-circuit impedance
10:00 - 10:30Coffee break
10:30 - 12:002. Standardization • Needs, committees (IEC), legal background • Principles of EMC coordination • EMC standards series IEC 61000 • Product standard EN 50160 (Europe) • Activities in CIRED, CIGRE and at European energy regulators
12:00 - 13:00Lunch break
13:00 - 14:303. Measurement aspects • Measurement methods and indices (i.a. IEC 61000-4-7) • Measurement uncertainty (including transducers) • Objectives for grid measurements • Design criteria for measurement campaigns • Advanced data analysis approaches
14:30 - 15:00Coffee break
15:00 - 16:304. Harmonics (1) • Power definitions under non-sinusoidal conditions • Typical sources • Summation of multiple sources • Propagation in the network
16:30 - 17:00Questions and Answers (discussion)
22.05.2024
08:30 - 10:005. Harmonics (2) • Network harmonic impedance and resonances • Modelling and simulation techniques • Calculation of emission limits for customer installations • Evaluation of contribution of a customer installation
10:00 - 10:30Coffee break
10:30 - 12:006. Interharmonics • Definitions, typical sources and effects • Propagation in the network 6. Supraharmonics • Definitions, typical sources and effects • Emission characteristics and interference paths • Summation of multiple sources
12:00 - 13:00Lunch break
13:00 - 14:307. Case studies • Supraharmonic resonance in an LV network with fast charging station • Harmonic emission of a fast charging infrastructure with storage for peak shaving • Measurement-based assessment of harmonic emission of an industrial customer connected to the LV network • Impact of passive filter placement on harmonic impedance in transmission systems (simulation-based) • Measurement-based identification of network harmonic impedance and harmonic propagation in a 400-kV-network
14:30 - 15:00Afternoon break
15:00 - 16:008. Example calculation Evaluation of harmonic voltage disturbances caused by EV charging • Implementation of simplified harmonic model of network • Implementation of simplified harmonic model of EV chargers Calculation of disturbance level at the connection point (with/without background distortion)
16:00 - 16:309. Further challenges • Impact of increasing amount of power electronic based generation • Harmonic stability related to inverter-based generation Unbalance caused by high-power single-phase equipment
16:30 - 17:00Questions and Answers (discussion)

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