Analysis of Subsynchronous Oscillation of Direct Drive PMSG Based Wind Farm Under Low Operating Condition
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ORIGINAL ARTICLE
Analysis of Subsynchronous Oscillation of Direct Drive PMSG Based Wind Farm Under Low Operating Condition Gangui Yan1 · Wenbo Hu1 · Qi Jia1 · Kan Liu1 · Junxi Wang1 Received: 30 June 2020 / Revised: 17 August 2020 / Accepted: 21 September 2020 © The Korean Institute of Electrical Engineers 2020
Abstract Aiming at the sub-synchronous oscillation (SSO) problem that direct-drive permanent magnetic synchronous generator (PMSG) based wind farm under low operating conditions connects to the grid, based on the idea of graphical block modeing, the wind turbine generation (WTG), collector circuit and grid are regarded as discrete components. On the basis of establishing detailed models of each component, two linearized models of direct-drive PMSG based wind farm under different collector circuit topological structure is constructed. Wind farm impedance model is constructed based on state space equation of linearized model. The influences of current inner loop control parameters, grid strength, operating conditions on SSO characteristics are analysed. The difference between the two models in the study of SSO is compared. Finally, a time-domain simulation model of direct drive PMSG based wind farm connected to grid is built in EMTDC/PSCAD and the validity of the theoretical analysis is verified. Keywords Direct drive PMSG based wind farm · Sub-synchronous oscillation · Linearized modeling · Impedance modeling
1 Introduction Large-scale development and utilization of wind power is an important way to promote energy transformation and meet environmental challenges. By the end of 2019, the cumulative installed capacity of wind power in China has reached 210 million kilowatts, and it is expected that the cumulative installed capacity of wind power in 2050 will reach 2.4 billion kilowatts, showing a rapid development trend of wind * Qi Jia [email protected] Gangui Yan [email protected] Wenbo Hu [email protected] Kan Liu [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
power [1]. However, in recent years, due to the extensive access of wind power, the phenomenon of sub-synchronous oscillation (SSO) in modern power system occurs frequently [2–8]. On July 1, 2015, direct-drive permanent magnetic synchronous generator (PMSG) based wind farms in Xinjiang province of the northwest of China whose installed capacity is 1500 MW without series compensated capacitance connects to grid by long distance transmission lines. A 20 Hz SSO incident occurred in this system, which leads successive tripping of torsional oscillation protection of turbogenerator shafting. This accident caused the regional power grid frequency from 50.05 to 49.91 Hz, threatening the safe operation of the system [9, 10]. At present, a lot of research has been conducted on this SSO phenomenon between PMSG based wind farms without series-compensated capacitance. Fan and Mi
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