Analysis of Generator-Grid Coupling Characteristics and Stability for Direct-drive Wind Turbines with Different Control Strategies

被引：0
|
作者：
Rao Y. [1 ]
Lyu J. [1 ]
Dai J. [1 ]
Wang H. [1 ]
Cai X. [1 ]
机构：
[1] Key Laboratory of Control of Power Transmission and Conversion, Ministry of Education (Shanghai Jiao Tong University), Shanghai
来源：
Dianli Xitong Zidonghua/Automation of Electric Power Systems | 2024年 / 48卷 / 04期
基金：
中国国家自然科学基金;
关键词：
direct-drive wind turbines; generator-grid coupling; impedance; inertia synchronization control; stability; vector control; virtual synchronous generator control;
D O I：
10.7500/AEPS20230627009
中图分类号：
学科分类号：
摘要：
The interaction between the direct-drive wind turbines and the weak AC grid or flexible DC transmission system will easily lead to wideband oscillation events. It is generally believed that the interaction characteristics between direct-drive wind turbines and AC/DC power grids mainly depend on the grid-side converters, so the dynamics of the generator-side system of direct- drive wind turbines are usually ignored. There have been some literatures discussing the influence of the generator-side system under traditional vector control on the grid-connected characteristics of direct-drive wind turbines, but there is a lack of relevant research on the generator-grid coupling characteristics for direct-drive wind turbines with different control strategies. In this paper, the generator-grid coupling characteristics of direct-drive wind turbines with four typical control strategies are compared. First, the detailed impedance models of direct-drive wind turbines with different control strategies are derived and verified. Then, based on the generator-grid coupling degree index, the generator-grid coupling characteristics of direct-drive wind turbines are compared and analyzed, and the influence of generator-side system dynamics on AC impedance characteristics and grid-connected stability of direct-drive wind turbines with different control strategies is obtained. Finally, the correctness of the theoretical analysis is verified by the case analysis of direct-drive wind turbines connecting to weak AC power grid. © 2024 Automation of Electric Power Systems Press. All rights reserved.
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页码：150 / 159
页数：9
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