| 引用本文: | 张哲,乔登科,汪云涛,薛静玮,林毅,薛安成.正阻尼PMSG并网系统限幅间歇饱和引起的次/超同步振荡分析[J].电力自动化设备,2023,43(9):33-38. |
| ZHANG Zhe,QIAO Dengke,WANG Yuntao,XUE Jingwei,LIN Yi,XUE Ancheng.Analysis on subsynchronous/supersynchronous oscillations caused by limit intermittent saturation in positive damping PMSG integrated system[J].Electric Power Automation Equipment,2023,43(9):33-38. |
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| 摘要: |
| 风电并网所引起的次/超同步振荡研究多集中于小信号模型分析，较少考虑遭受大扰动后限幅等非线性影响。基于单边限幅的描述函数与广义Nyquist判据，对正阻尼直驱式永磁同步发电机(PMSG)限幅环节间歇饱和引起的切换型次/超同步振荡进行分析。首先给出并网PMSG状态空间简化模型并分析其小干扰稳定性；其次发现一种大扰动后并网PMSG因不对称单边d轴电流限幅间歇饱和引起的新型切换型振荡现象；再次结合并网PMSG网侧变流器的频域模型以及单边限幅的描述函数，给出含限幅环节的PMSG系统近似分析模型；最后结合广义Nyquist判据，近似分析不同限幅值和参数下的振荡频率，并解释该种振荡频率随限幅上限降低而增加的现象。 |
| 关键词: PMSG 限幅环节 间歇饱和 次/超同步振荡 描述函数 |
| DOI：10.16081/j.epae.202302003 |
| 分类号: |
| 基金项目:国网福建省电力有限公司科技项目(52130N20000J) |
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| Analysis on subsynchronous/supersynchronous oscillations caused by limit intermittent saturation in positive damping PMSG integrated system |
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ZHANG Zhe1, QIAO Dengke2, WANG Yuntao1, XUE Jingwei3, LIN Yi3, XUE Ancheng1
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1.State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources, North China Electric Power University, Beijing 102206, China;2.North China Branch of State Grid Corporation of China, Beijing 100053, China;3.Economic and Technology Research Institute of State Grid Fujian Electric Power Co.,Ltd.,Fuzhou 350012, China
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| Abstract: |
| The research on subsynchronous/supersynchronous oscillations caused by wind power integrated system mainly focuses on small-signal model analysis. Nonlinear effects such as amplitude limit after large disturbance are rarely considered. Based on the description function of unilateral limit and the generalized Nyquist criterion, the switching subsynchronous/supersynchronous oscillations caused by intermittent saturation of limiting link in positive damped direct-drive permanent magnet synchronous generator(PMSG) is analyzed. Firstly, the state space simplified model of integrated PMSG is given and its small disturbance stability is analyzed. Secondly, a new switching oscillation phenomenon caused by asymmetric unilateral d-axis current limiting intermittent saturation of PMSG after large disturbance is found. Thirdly, combined with the frequency domain model of grid-side converter of PMSG and the description function of unilateral limiting, the approximate analysis model of PMSG system with limiting link is given. Finally, combined with the gene-ralized Nyquist criterion, the oscillation frequencies under different limiting values and parameters are appro-ximately analyzed, and the phenomenon that the oscillation frequency increases with the decrease of the upper limit is explained. |
| Key words: PMSG limiting link intermittent saturation subsynchronous/supersynchronous oscillations description function |
