Nodal Frequency Performance of Power Networks

TL;DR

This paper introduces a new performance metric for analyzing how disturbances affect nodal frequencies in power networks, linking generator inertia to initial frequency change rates and validating with simulations.

Contribution

It presents a novel metric that relates generator inertia to nodal frequency response, enhancing understanding of disturbance impacts in power systems.

Findings

Inertia inversely affects initial RoCoF in power networks.

The proposed metric effectively evaluates disturbance impacts on nodal frequencies.

Simulations confirm the metric's validity and usefulness.

Abstract

This paper investigates how a disturbance in the power network affects the nodal frequencies of certain network buses. To begin with, we show that the inertia of a single generator is in inverse proportion to the initial rate of change of frequency (RoCoF) under disturbances. Then, we present how the initial RoCoF of the nodal frequencies are related to the inertia constants of multiple generators in a power network, which leads to a performance metric to analyze nodal frequency performance. To be specific, the proposed metric evaluates the impact of disturbances on the nodal frequency performance. The validity and effectiveness of the proposed metric are illustrated via simulations on a multi-machine power system.