A Dynamized Power Flow Method based on Differential Transformation

TL;DR

This paper introduces a new dynamized power flow method that models power flow as a dynamic system, enabling efficient solution tracing without iterative solving, demonstrated on large test systems.

Contribution

It develops a differential transformation-based non-iterative algorithm for power flow analysis, transforming nonlinear equations into linear ones in the power series domain.

Findings

Successfully applied to large 2383-bus system

Avoids iterative solving by transforming equations into linear form

Demonstrates efficiency and accuracy in case studies

Abstract

This paper proposes a novel method for solving and tracing power flow solutions with changes of a loading parameter. Different from the conventional continuation power flow method, which repeatedly solves static AC power flow equations, the proposed method extends the power flow model into a fictitious dynamic system by adding a differential equation on the loading parameter. As a result, the original solution curve tracing problem is converted to solving the time domain trajectories of the reformulated dynamic system. A non-iterative algorithm based on differential transformation is proposed to analytically solve the aforementioned dynamized model in form of power series of time. This paper proves that the nonlinear power flow equations in the time domain are converted to formally linear equations in the domain of the power series order after the differential transformation, thus avoiding numerical iterations. Case studies on several test systems including a 2383-bus system show the merits of the proposed method.