TT04 Stability and harmonic power flow in converter-dominated grids under consideration of converters control nonlinearities (Part II)

Abstract

As largely acknowledged, the widespread integration of converter-interfaced distributed energy resources (DERs) has triggered fundamental changes in the operation of power systems and, as a matter of fact, the integration of power electronic devices is at the base of fundamental research on the topics of power systems’ stability, power quality and control. In a traditional power system, dynamics are mainly associated with synchronous generators and their controls responsible to maintain frequency and voltage through speed governors and automatic voltage regulators. Increased penetration of converter-interfaced DERs has a considerable impact on these controls requiring realistic, sophisticated and computationally-tractable DERs models as essential tools for the study of the stability and power quality of converter-dominated grids.

Within this context, the tutorial discusses the most recent developments regarding modeling strategies and frameworks applied to converter-dominated grids with particular focus on static analysis, harmonic power flow, small-signal stability and AC/DC interactions in converter-interfaced resources.

Course Outline (duration 4h)

Part 1: Modeling and stability in converter-dominated grids – 1 hours and 30 minutes
A. Fundamentals of modeling and control of grid-connected converters – 30 minutes
B. Nonlinear state-space modeling of power electronics-based power systems – 30 minutes
C. Stability analysis of power electronics-based power systems considering static and dynamic aspects – 30 minutes

Coffee break – 15 minutes

Part 2: Harmonic Power Flow in converter-dominated grids – 1 hours and 30 minutes
A. Harmonic power flow analysis in converter-dominated grids – 45 minutes
B. Impact of converter synchronization and DC voltage dynamics on harmonic propagation – 45 minutes

Questions and answers – 15-30 minutes

Instructors

Federico Cecati
Fraunhofer ISIT
federico.cecati@isit.fraunhofer.de

Marco Liserre
Chair of Power Electronics, Kiel University, Germany
ml@tf.uni-kiel.de

Mario Paolone
Chair of the Distributed Electrical Systems Laboratory, EPFL, Swiss
mario.paolone@epfl.ch

Johanna Becker
Chair of the Distributed Electrical Systems Laboratory, EPFL, Swiss
johanna.becker@epfl.ch