Following the successful first edition taught in 2023-2024 and strong interests of industry, we are pleased to announce the second edition of this unique course to start in
the week of 13 January 2025.

Early-Bird Registration for the 2025 Series is Now Open!

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Immittance-Based Frequency-Domain Stability Analysis and Design of Converter-Interfaced Resources and Power Systems

Power systems worldwide are undergoing a fundamental transition. Converter-interfaced resources are replacing conventional generators at an unprecedented rate and scale, and the grid is evolving into a hybrid ac-dc system because of the increasing use of HVDC transmission.

These trends point to a future grid based on converters. Developing and operating such a converter-based grid face many challenges, one of which is stability. The fast control of converters introduces high-frequency dynamics and creates new stability problems that are not considered in traditional power system studies. The fundamental-frequency models commonly used today cannot capture the fast dynamics of converters, hence are not suitable for their stability analysis. New modeling, analysis and design methods and tools at both the converter and system level are required to address this challenge.

A systematic approach that has been developed to meet this need is frequency-domain modeling and analysis based on immittances. The term immittance combines the concept of impedance and admittance, and may refer to either one. The essence of the approach is to

• Characterize individual converters and converter-interfaced resources in the frequency domain by their immittances measured at the grid-connecting terminals;
• Formulate immittance-based system models and apply Nyquist-like frequency-domain methods to determine system stability; and
• Shape converter and converter-interfaced resource immittances through their control design to solve instability problems and achieve system stability in general.

Compared to other possible approaches, such as dq-frame or state-space modeling and EMT simulation, immittance-based methods are easy to use, compatible with existing component and network models, conceptually intuitive, computationally efficient, and applicable to any type of systems. Early applications had focused on the grid interaction and integration of individual converter-interfaced resources and HVDC converters. A general framework was established in recent years for applications in more complex and larger systems, including future converter-based hybrid ac-dc grids. Utility and practicality of the methods have been demonstrated by many real-world applications. Software tools, laboratory measurement setups and new standards are also being developed to support practical adoption.

This course teaches the immittance-based frequency-domain methods systematically. Designed as an advanced training course for engineers and researchers working in the field of renewable energy, HVDC transmission, as well as grid planning and operation, the course provides an in-depth coverage of the methods from fundamental theory to practical applications.

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