Impedance-Based Oscillatory Stability Analysis of High Power Electronics-Penetrated Power Systems—A Survey

Yong Hu,Yi Liu,Bin Zhou,Cheng-Wei Fei,Siqi Bu

doi:10.1109/access.2019.2937395

Abstract

With increasing power electronics integrated into the power grids, the new types of oscillation issues have posed a critical threat to the secure operation of power grids. Apart from the conventional eigenvalue-based analysis, the impedance-based analysis becomes more attractive for the assessment of the oscillatory stability. This paper presents a systematic survey on the technical matters of the emerging impedance-based oscillatory stability analysis of power systems with high power electronics penetration. Firstly, the detailed derivation of impedance models of the power electronic converter-connected equipment are discussed. Then, common coordinate systems for the derivation of impedance models, as well as the characteristics of the impedance model in different coordinate systems are surveyed. On this basis, the aggregation of the individual impedance models is introduced to derive the lumped impedance model. Additionally, two typical impedance-based oscillatory stability criteria are demonstrated and discussed in details. Finally, the advantages as well as the limitations of the impedance-based oscillatory stability analysis, and the contributions as well as the challenges of the existing studies are summarized. A list of relevant literature is accommodated in the end.

Highlights

The large number of power electronics and the complexity of the network topology lead to the consequence that the dimension of the statespace matrix becomes very high [45], which has significantly raised the modeling difficulty as well as the computational burden of computers and affected the efficiency of stability studies [52], [53]; (ii) in addition, the eigenvalue-based analysis cannot effectively reveal the physical mechanism of the emerging oscillation phenomena in a wide frequency range of interests [14]
The evaluation of the oscillatory stability is of great importance to the secure operation of power systems, and the impedance-based analysis provides an effective solution
This paper carries out a systematic review on the published research of the impedance-based oscillatory stability analysis of power systems with high power electronics penetration

Summary

Introduction

The large number of power electronics and the complexity of the network topology lead to the consequence that the dimension of the statespace matrix becomes very high [45], which has significantly raised the modeling difficulty as well as the computational burden of computers and affected the efficiency of stability studies [52], [53]; (ii) in addition, the eigenvalue-based analysis cannot effectively reveal the physical mechanism of the emerging oscillation phenomena in a wide frequency range of interests [14].

Results

Conclusion