Wide frequency range active damping of LCL-filtered grid-connected converters

• Main Authors: Abdelhady Ghanem, Mohamed Rashed, Mark Sumner, Mohamed Adel El-sayes, Ibrahim. I. I. Mansy
• Format: Article
• Language: English
• Published: Wiley 2019-04-01
• Series: The Journal of Engineering
• Subjects: frequency-domain analysis; power convertors; power filters; power grids; electric current control; damping; power system stability; feedback; voltage control; multiple resonances; LCL-filtered grid-connected converters; wide frequency range active damping; parallel grid-connected converters; single grid-connected converters; frequency domain analysis; controller stability; wide frequency active damping; multiple resonance frequencies; capacitor voltage feedback; power converters; multiple resonance effects; active damping technique
• Online Access: https://digital-library.theiet.org/content/journals/10.1049/joe.2018.8164

It can be challenging to guarantee the stability of grids with many converters with LCL filters connected due to the presence of multiple resonances within the system. This paper presents an active damping technique to mitigate multiple resonance effects and harmonics in power converters connected to weak grids. The proposed technique employs grid current and capacitor voltage feedback to achieve active damping for a wide range of multiple resonance frequencies. The effectiveness of the proposed wide frequency active damping and improved controller stability is demonstrated through frequency domain analysis and experimental results for single and parallel grid-connected converters.