Small signal stability analysis for different types of PMSGs connected to the grid

RENEWABLE ENERGY

卷:106

Article

Xie, Da¹  Lu, Yupu¹  Sun, Junbo¹  Gu, Chenghong² 

[1] Shanghai Jiao Tong Univ, Dept Elect Engn, Shanghai 200240, Peoples R China

[2] Univ Bath, Dept Elect & Elect Engn, Bath BA2 7AY, Avon, England

关键词: Converter system;    Eigenvalue analysis;    PMSG-based wind turbine;    Small-signal stability;    Two-mass shaft model;   

DOI  :  10.1016/j.renene.2017.01.021

来源: Elsevier

【 摘 要 】

Small signal stability of permanent magnet synchronous generator (PMSG)-based wind turbines connected to the power grid should be studied properly in order to facilitate damping strategy design. In this paper, unified small-signal models for different types of PMSGs are developed to study their small-signal stability. The models are composed of mechanical systems, electrical systems and control systems. A two mass shaft model for the mechanical system is provided to analyze the dynamic and steady-state behaviors of the wind turbine and generator rotor. Meanwhile, PMSG, converter system and transmission line are separately modeled to build unified small-signal models for three PMSG-based Wind turbine generator systems (WTGS). Then, based on unified small-signal models, eigenvalue analysis is conducted to determine the relation between different oscillation modes and state variables through calculating participation factors. With modal analysis, the developed small signal models are able to find out all types of oscillation modes for PMSGs connected to the power grid, which are subsynchronous oscillation (SSO), subsynchronous control interaction (SSCI) and low-frequency oscillation, including frequency and damping of each oscillation mode. Different initial values of the small signal models can influence both frequencies and damping ratios of oscillation modes, which lay basis for further damping strategy study. (C) 2017 Elsevier Ltd. All rights reserved.

【 授权许可】

Free