Impact of DFIG-Based WTs on Subsynchronous Oscillation Damping of SG Based on the Net Electrical Damping Method
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ORIGINAL ARTICLE
Impact of DFIG‑Based WTs on Subsynchronous Oscillation Damping of SG Based on the Net Electrical Damping Method Gangui Yan1 · Qi Jia1 · Kan Liu1 · Wenbo Hu1 · Junxi Wang1 Received: 23 May 2020 / Revised: 27 September 2020 / Accepted: 25 November 2020 © The Korean Institute of Electrical Engineers 2020
Abstract Subsynchronous oscillations (SSOs) induced during the generation of wind power constitute an important problem that affects the safety and the stability of power systems. It is useful to study the impact of wind turbines on the damping of the SSOs of a synchronous generator (SG). On the one hand, the relevant studies have been based mainly on eigenvalue analysis, which is insufficient, and on the other, an examination of the general mechanism of the SSO is still lacking. Based on the net electrical damping analysis method, this paper examines the dynamic interaction between the SG and doubly fed induction generator-based wind turbines (DFIGs). The self-stabilizing damping coefficient and the mutually stabilizing damping coefficient are proposed from the perspective of the SG, and the effects of different numbers and current loop control parameters of the DFIGs on torsional modes of the SG are analyzed using different grid structures. A time-domain simulation model of DFIGs connected to a power grid is built in EMTDC/PSCAD to verify the correctness of the theoretical analysis. Keywords Synchronous generator · Subsynchronous oscillation · Doubly fed induction generator · Self-stabilizing damping coefficient · Mutually stabilizing damping coefficient
1 Introduction The large-scale development and utilization of wind generation technology is regarded as an important way to realize the goal of sustainable energy while responding to environmental challenges. In the last decade, the occurrence of subsynchronous oscillation (SSO) events in wind turbines (WTs) connected to power grids has attracted considerable academic interest. In 2009, a power grid in South Texas in * Qi Jia [email protected] Gangui Yan [email protected] Kan Liu [email protected] Wenbo Hu [email protected] Junxi Wang [email protected] 1
Key Laboratory of Modern Power System Simulation and Control and Renewable Energy Technology Ministry of Education, Northeast Electric Power University, Jilin 132012, China
the USA recorded SSOs at a frequency of 20 Hz. Doubly fed induction generator (DFIG)-based wind turbines (WTs) were connected to the system through transmission lines with series compensators, and the SSOs damaged a large number of crowbar circuits of the WTGs [1]. A similar incident occurred in DFIG-based WTs in Hebei province in North China in 2011. The oscillation frequency there was 3–10 Hz [2]. In 2015, another SSO event occurred in permanent magnetic synchronous generator (PMSG)-based WTs in the Xinjiang Hami area of China [3]. The oscillation tripped SGs that were 300 km away. Since the occurrence of these SSO events, a number of studies have examined the mechanism and characteristics of SSOs. According to t
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