# Industrial/PhD Course: Managing Harmonics in Modern Power Distribution Networks

## Time

13.06.2022 kl. 08.30 - 15.06.2022 kl. 16.30

## Description

### Organizer:

Professor Xiongfei Wang xwa@et.aau.dk, Aalborg University, Denmark

### Lecturers:

Dr. Jan Meyer, Technical University of Dresden, Germany

Prof. Xiongfei Wang, and Dr. Ariya Sangwongwanich, Aalborg University, Denmark.

### ECTS: 3

### Description:

The ever-increasing penetration of power-electronic-based sources and loads in power distribution networks poses new challenges to the quality of electricity supply. This course intends to provide a systematic discussing on the modeling, analysis and measurement of harmonics in modern power distribution systems. The theoretical modeling and analysis on the harmonic impacts of photovoltaic (PV) inverters in distribution systems will be introduced first. New developments and concepts in determining and assessing the harmonic emission limits and, in particular the supraharmonics above 2 kHz will then be reviewed. Next, practical aspects of harmonic measurements and the impedance identifications of network and devices will be discussed. Lastly, the system-level harmonic studies in low-voltage (LV) distribution networks with PV and electric vehicles (EVs) will be presented. Each aspect is illustrated by real world examples. The main topics to be covered include:

- Harmonic modeling and analysis of PV inverters considering the control impacts with different grid strengths
- Latest grid codes, standards and compliance assessment for power electronic based devices
- Supraharmonics (2 kHz - 150 kHz): sources, mechanisms, propagation and resonances
- Harmonic measurement techniques and suitability of voltage and current transducers
- Frequency-dependent impedance measurement of LV distribution networks
- “Black-box” harmonic and impedance measurements of PV inverters and EVs
- Harmonic studies of LV distribution power networks due to PV and EVs

#### Day 1: *Harmonic Modeling and Analysis of PV Inverters, Prof. Xiongfei Wang (4 hours), Dr. Ariya Sangwongwanich (2 hours) *

- Introduction to harmonic generation mechanisms of PV inverters
- Representations of PV inverters for harmonic analysis
- Case studies with different grid strengths and voltage distortions
- Interharmonics analysis and mitigation in PV inverters

#### Day 2:* Standards and Practical Measurements of Harmonics, Dr. Jan Meyer (6 hou*rs)

- Latest update on grid codes, standards, and compliance assessment
- Supraharmonics (2 kHz – 150 kHz): sources, propagation and resonances
- Harmonic measurement techniques
- Suitability of voltage and current transducers

#### Day 3: *Harmonic Studies in Modern LV Distribution Networks, Dr. Jan Meyer (6 hours) *

- Frequency-dependent impedance measurement of LV distribution networks
- “Black-box” impedance measurement of PV inverters and EV chargers
- Measurement case studies on a 1-MW PV power plant and a 12-MW wind park
- Harmonic modeling and analysis of LV distribution networks

### Prerequisites:

Prior knowledge of power electronics fundamentals, digital signal processing, and power quality basics are preferred.

### Form of evaluation:

Exercises and report

### Price

6000 DKK for PhD students outside of Denmark and 8000 DKK for the Industry.

### Host

AAU Energy

### Address

Aalborg University, Fibigerstræde 14, room 58

### Registration Deadline

23.05.2022 kl. 23.59