Analysis of frequently over‐threshold subsynchronous oscillation and its suppression by subsynchronous oscillation dynamic suppressor. Issue 9 (1st June 2016)

• Record Type: Journal Article
• Authors: Xiao, Xiangning; Luo, Chao; Zhang, Jian; Yang, Wenchao; Wu, Yunsheng
• Is Part Of: IET generation, transmission & distribution. Volume 10:Issue 9(2016)
• Page Start: 2127
• Page End: 2137
• Publication Date: 2016-06-01
• Subjects: power plants -- power convertors -- power generation control -- damping -- closed loop systems; subsynchronous oscillation dynamic suppressor -- FOSSO mitigation phenomenon -- frequently over‐threshold subsynchronous oscillation mitigation phenomenon -- Hulunbuir power plant -- China -- voltage source converter -- VSC -- SSODS -- damping characteristics -- complex torque coefficient method -- closed‐loop testing -- torsional modal frequency measurement -- commissioning testing -- field verification testing; Electric power production -- Periodicals; Electric power transmission -- Periodicals; Electric power distribution -- Periodicals; 621.3105
• DOI: 10.1049/iet-gtd.2015.1153
• Languages: English
• ISSNs: 1751-8687

Abstract

Abstract : To mitigate the frequently over‐threshold subsynchronous oscillation (FOSSO) phenomenon which occurred in Hulunbuir power plant in the northeast of China, a novel equipment based on voltage source converter (VSC), named subsynchronous oscillation dynamic suppressor (SSODS) is developed and installed. In this study, the root cause of FOSSO is revealed by analysing the response characteristics of the system. Then the control strategy of the developed SSODS is presented. Damping characteristics of SSODS are analysed by the complex torque coefficient method. To verify the effectiveness of the control strategy and the physical controller of VSC, as well as provide initially optimised controller parameters for the field tests, real‐time closed‐loop tests are carried out. A novel method of torsional modal frequency measure for onsite commissioning test is proposed. The operation and field verification test of SSODS is introduced, and test results demonstrate that SSODS can mitigate the new SSO phenomenon dramatically, proving the validity of SSODS.