Sequence Domain SISO Equivalent Models of a Grid-Tied Voltage Source Converter System for Small-Signal Stability Analysis

By Chen Zhang, Xu Cai, Atle Rygg, Marta Molinas. IEEE transactions on energy conversion, 2018

231 citations recorded by the source corpus.

This paper presents a generalized method for converting multi-input and multi-output (MIMO) <inline-formula> <tex-math notation="LaTeX">$dq$</tex-math></inline-formula> impedance model of a grid-tied voltage source converter system into its sequence domain single-input and single-output (SISO) equivalents. As a result, two types of SISO impedance models were derived, one of which was derived from relatively strong and <inline-formula> <tex-math notation="LaTeX">$dq$</tex-math></inline-formula> symmetric grid assumption (reduced SISO model) and the other was based on closed-loop equivalent (accurate SISO model). It was proven that the accurate SISO model has the same marginal stability condition as the MIMO model. Accuracy of these models is assessed with respect to the measured impedances in PSCAD/EMTDC simulations, their effects on stability are analyzed as well. Findings show that the accurate SISO model presents identical stability conclusions as the MIMO model. However, the reduced SISO model may lead to inaccurate results if the system is highly <italic><inline-formula><tex-math notation="LaTeX">${\rm{dq}}$ </tex-math></inline-formula></italic> asymmetric, e.g., VSC with fast phase-locked loop or an actively controlled grid.

Subfields: Control and Systems Engineering, Electrical and Electronic Engineering

View Paper: https://www.semanticscholar.org/paper/25ce79ae658aa69aac7a26410259ee144269b8e6

How researchers see this paper

The researchers whose trusted networks rank it highest, strongest advocate first. Every researcher gets a different order.

In Control and Systems Engineering

1. Xiongfei Wang
2. Frede Blaabjerg
3. Dongsheng Yang
4. Fangcheng Liu
5. Yunfeng Liu
6. Kai Xin
7. Yunjie Gu
8. T. Green

In Electrical and Electronic Engineering

1. Xiongfei Wang
2. Frede Blaabjerg
3. Dongsheng Yang
4. Fangcheng Liu
5. Yunfeng Liu
6. Kai Xin
7. Huai Wang
8. Yunjie Gu

Citations in the corpus

• Symmetrical PLL for SISO Impedance Modeling and Enhanced Stability in Weak Grids (2020, methodology): “To facilitate the stability analysis and control design, some research efforts have been made to approximate the MIMO system to a single-input and single-output (SISO) system [11].”
• Grid-Synchronization Stability of Converter-Based Resources—An Overview (2020, unknown): “including the grid impedance [44], [45].”