A General Initialization Scheme for Electromagnetic Transient Simulation: Towards Large-Scale Hybrid AC-DC Grids

TL;DR

This paper introduces EMT-GIS, a general initialization scheme for electromagnetic transient simulation in large-scale hybrid AC-DC grids, enabling faster and more stable system startup for accurate dynamic analysis.

Contribution

It proposes a novel EMT-GIS method with an integrated power flow algorithm and snapshot splicing mechanism, suitable for EMTP-type simulators in large hybrid grids.

Findings

Effective in large-scale hybrid AC-DC systems

Reduces initialization time and improves stability

Validated on a Chinese hybrid grid model

Abstract

With the large-scale hybrid AC-DC grids coming into being, electromagnetic transient (EMT) simulation is required to accurately describe the dynamics of systems. However, the EMT steady-state initialization for hybrid AC-DC system is difficult and time-consuming when the system scale is huge. In order to provide a stable snapshot for EMT simulation with nonlinear components and black-box components, this paper proposes a general initialization scheme for EMT simulation (EMT-GIS) which can be implemented in the electromagnetic transient program (EMTP)-type simulators. First, an integrated power flow (IPF) algorithm is introduced to provide the steady-state results. Then, an initialized snapshot calculation-and-splicing mechanism is designed for EMT-GIS. The proposed EMT-GIS is tested using a hybrid AC-DC system in China on the CloudPSS simulation platform. Test results verify the effectiveness of the proposed EMT-GIS.