Work

Two-coordinate decomposed SISO models-based stability analysis of three-phase grid-connected inverter systems with asymmetric control

Year: 2023

Type: article

Abstract: In this paper, the Single-Input Single-Output (SISO) theory-based stability analysis method for weak grids with a three-phase grid-connected inverter (GCI) incorporating asymmetrical control is proposed in dq-frame and sequence domain, respectively. Initially, the paper presents two-coordinate decomposed models for Multi-input Multi-output (MIMO) systems. These models reveal that the stability of the MIMO system can be evaluated by analyzing two open-loop gains in the dq-frame or a single gain in the sequence domain using Nyquist/Bode plots. Next, the proposed analytical method is compared with existing state-of-the-art techniques. Theoretical analysis demonstrates that the proposed method enables the separate design of asymmetrical control in the d-axis and q-axis using the dq-frame approach. Furthermore, it enables the identification of the system's instability axes, namely the d-axis and q-axis. On the other hand, the proposed method in the sequence domain offers a lower computational complexity while accurately identifying the system's frequency-coupled resonances. Finally, the effectiveness of the proposed method is validated through simulations and experiments, consolidating its practical applicability.

Source: International Journal of Electrical Power & Energy Systems

DOI: 10.1016/j.ijepes.2023.109333

Authors: Xianfu Lin, Ruoxue Yu, Jingrong Yu, He Wen

Institutions: Hunan University, Changsha Electric Power Technical College, Central South University

Language: English

Topic: Microgrid Control and Optimization

Subfield: Control and Systems Engineering

Field: Engineering

Domain: Physical Sciences

SDGs: Industry, innovation and infrastructure, Affordable and clean energy

Open Access status: hybrid

Estimated APC paid: $2,800