Sub-synchronous oscillation risk between PMSG farm and series complement

• Published in: 电力工程技术 Vol. 41; no. 4; pp. 25 - 32
• Main Authors: LIU Wenyuan, REN Bixing, LI Haifeng, WANG Haifeng, WANG Yang
• Format: Journal Article
• Language: Chinese
• Published: Editorial Department of Electric Power Engineering Technology 01.07.2022
• Subjects: open loop mode resonance; permanent magnet synchronous generator (pmsg) farm; residual estimation; series compensated line; sub-synchronous oscillation; system stability
• ISSN: 2096-3203
• DOI: 10.12158/j.2096-3203.2022.04.004

With the continuous expansion of power grid scale, the phenomenon of subsynchronous oscillation caused by series compensated long-distance transmission system occurs frequently. Therefore, in order to analyze the deep reasons for the instability of the series compensated transmission system, based on the open-loop mode resonance theory, an open-loop mode resonance analysis method is proposed to analyze the subsynchronous oscillation caused by the series compensated transmission line. The small signal model of the external series compensated transmission line of permanent magnet synchronous generator (PMSG) farm is established, and the dynamic interaction between the series compensated line and the PMSG farm is studied through the open-loop mode resonance analysis method. The results show that the closed-loop stability of the system decreases when the open-loop subsynchronous oscillation mode dominated by series compensation is close to the open-loop subsynchronous oscillation mode dominated by wind farm in th