On the steady-state behavior of a nonlinear power system model

TL;DR

This paper analyzes the steady-state behavior of a nonlinear power system model, providing necessary and sufficient conditions for stable operation based on network and generator dynamics, with implications for control strategies.

Contribution

It introduces a comprehensive framework for characterizing steady-state conditions in nonlinear power systems, linking network balance equations with generator dynamics.

Findings

Derived necessary and sufficient conditions for steady-state stability.

Separated transmission network and generator steady-state conditions.

Provided insights for designing power system control strategies.

Abstract

In this article, we consider a dynamic model of a three-phase power system including nonlinear generator dynamics, transmission line dynamics, and static nonlinear loads. We define a synchronous steady-state behavior which corresponds to the desired nominal operating point of a power system and obtain necessary and sufficient conditions on the control inputs, load model, and transmission network, under which the power system admits this steady-state behavior. We arrive at a separation between the steady-state conditions of the transmission network and generators, which allows us to recover the steady-state of the entire power system solely from a prescribed operating point of the transmission network. Moreover, we constructively obtain necessary and sufficient steady-state conditions based on network balance equations typically encountered in power flow analysis. Our analysis results in several necessary conditions that any power system control strategy needs to satisfy.