The intrinsic communication in power systems: a new perspective to understand stability

30 Mar 2021  ·  Yunjie Gu, Yitong Li, Timothy C. Green ·

The large-scale integration of converter-interfaced resources in electrical power systems raises new threats to stability which call for a new theoretic framework for modelling and analysis. In this paper, we present the intrinsic analogy of a power system to a communication system, which is here called power-communication isomorphism. Based on this isomorphism, we revisit power system stability from a communication perspective and thereby establish a theory that unifies the heterogeneous power apparatuses of a power systems and provide a bridge the between the electromagnetic transient (EMT) and phasor analysis frameworks. This theory yields several new insights into power system stability and new possibilities for stabilisation. In particular, we demonstrate that a system of 100\% converter-interfaced resources can achieve stable synchronisation in small- and large-signal sense under grid-following control which was commonly considered impossible.

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