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.

Language:

English

Graduation document:

TalTech certificate

Lector:

Registration deadline:

05.06.2024 23:59

Timetable: