Abstract
This paper introduces a methodology to study converter-based power system stability using immittance-based frequencydomain models. The approach is based on modeling individual converters by their impedance and admittance (collectively referred to as immittance) measured at their grid interfaces. Together with network immittance, they enable a system model to be formulated in the frequency domain for stability study. The immittance-based models capture system dynamics from subsynchronous to EMT (electromagnetic transient) frequency range, thereby overcoming the limitations of fundamentalfrequency models used in traditional power system studies. The method is a generalization of the impedance-based stability analysis method for individual converters connected to the grid. It can be applied to ac, dc and hybrid ac-dc power systems with any number of converter-based resources. The paper reviews the method and use a practical wind power system to demonstrate the applications.
Published Version
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