Small-Signal Stability Analysis of Voltage Source Inverters Operating under Low Short-Circuit Ratios

被引：1

作者：

Bryant, Jack S. ^{[1
]}

McGrath, Brendan ^{[1
]}

Meegahapola, Lasantha ^{[1
]}

Sokolowski, Peter ^{[1
]}

机构：

[1] RMIT Univ, Sch Engn, Melbourne, Vic, Australia

来源：

2021 IEEE MADRID POWERTECH | 2021年

基金：

澳大利亚研究理事会;

关键词：

Grid-feeding inverter; low system strength; participation factors; small-signal model; stability analysis; weak grid;

D O I：

10.1109/PowerTech46648.2021.9494811

中图分类号：

X [环境科学、安全科学];

学科分类号：

08 ; 0830 ;

摘要：

Stability issues typically arise when inverter-based renewable energy generation connects to busbars in the power grid containing a low short-circuit ratio. This paper presents a small-signal model of a grid-feeding inverter incorporating dynamics associated with the current regulator, pulse width modulator, phase-locked loop, and interconnecting filter. We apply the fast voltage stability index (FVSI) to characterize the system's dynamic operating limits for a wide range of inverter operating points. The grid's physical limitations are shown to be more pronounced when the inverter operates at a leading power factor. Furthermore, eigenvalue trajectories highlight the criticality of appropriately selected current regulator gains. Last, participation factor analysis illustrates changes in the system's states' behavior as the short-circuit ratio decreases.

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页数：6

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