Interaction characteristics of subsynchronous modes of a wind-thermal bundled system

被引：0
|
作者：
Wang P. [1 ]
Chen W. [1 ]
Tian S. [1 ]
Yu H. [2 ]
Lin Y. [2 ]
机构：
[1] College of Electrical and Power Engineering, Taiyuan University of Technology, Taiyuan
[2] Grid Planning & Research Center, Guangdong Power Grid Co., Ltd., Guangzhou
来源：
Dianli Xitong Baohu yu Kongzhi/Power System Protection and Control | 2023年 / 51卷 / 17期
基金：
中国国家自然科学基金;
关键词：
permanent magnetic synchronous generator; subsynchronous oscillation; weak damping; wind-thermal bundled system;
D O I：
10.19783/j.cnki.pspc.230041
中图分类号：
学科分类号：
摘要：
There is a risk of inducing subsynchronous oscillations in the mode interactions between wind power and the thermal units that are bundled with it. In this paper, the law of mode quasi-strong interaction of a wind-thermal bundled system is studied: with a change of parameters, the permanent magnetic synchronous generator (PMSG) phase-locked loop (PLL) mode is close to that of the thermal power shaft system and a mode quasi-strong interaction occurs. The motion direction of two modes changes, whereby the weakly damped mode crosses the imaginary axis and quickly becomes the negatively damped mode, triggering subsynchronous oscillation, and the system oscillation disappears after the modes move away from each other. It is shown that both the turbine shaft mode of thermal power plants and the PLL mode may cross the imaginary axis leading to subsynchronous oscillations, while the main part of the system oscillations is determined by the negatively damped modes. Enhancing the damping of the modes where coupling occurs helps to suppress the interaction, and increasing the number of grid-connected turbines and line impedance both enhance the risk of system subsynchronous oscillations and exacerbate the degree of oscillations. Finally, the correctness of the theoretical analysis is verified by building a model of a wind-thermal bundled system based on PSCAD/EMTDC, and countermeasures are proposed to avoid the occurrence of oscillations. © 2023 Power System Protection and Control Press. All rights reserved.
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页码：91 / 100
页数：9
相关论文
共 26 条
  • [1] DOBSON I, ZHANG Jianfeng, GREENE S, Et al., Is strong modal resonance a precursor to power system oscillations?, IEEE Transactions on Circuits and Systems. I. Fundamental Theory and Applications, 48, 3, pp. 340-349, (2001)
  • [2] SEIRANYAN AP., Collision of eigenvalues in linear oscillatory systems, Journal of Applied Mathematics and Mechanics, 58, 5, pp. 805-813, (1994)
  • [3] SEYRANIAN AP., Sensitivity analysis of multiple eigenvalues, Mechanics of Structures and Machines: An International Journal, 21, 2, pp. 261-284, (1993)
  • [4] NOMIKOS B, VOURNAS C., Modal interaction and PSS design, 2001 IEEE Porto Power Tech Proceedings (Cat. No.01EX502), pp. 1-6, (2001)
  • [5] PENTAYYA P, KUMAR C, PATIL S, Et al., Modal resonance in power system-a case study, 2014 IEEE International Conference on Power Electronics, Drives and Energy Systems (PEDES), pp. 1-6, (2014)
  • [6] PENTAYYA P, ANUMASULA R, PATIL S, Et al., Spontaneous oscillations and modal resonance in Indian grid: a case study, 2014 Eighteenth National Power Systems Conference (NPSC), pp. 1-6, (2014)
  • [7] PADIYAR K, SAIKUMAR H., Investigations on strong resonance in multimachine power systems with STATCOM supplementary modulation controller, IEEE Transactions on Power Systems, 21, 2, pp. 754-762, (2006)
  • [8] DU Wenjuan, BI Jingtian, WANG Haifeng, Damping degradation of power system low-frequency electromechanical oscillations caused by open-loop modal resonance, IEEE Transactions on Power Systems, 33, 5, pp. 5072-5081, (2018)
  • [9] DU Wenjuan, WANG Yang, WANG Haifeng, Et al., Concept of modal repulsion for examining the sub-synchronous oscillations in power systems, IEEE Transactions on Power Systems, 33, 4, pp. 4616-4624, (2018)
  • [10] MAO Yujie, SUN Haishun, HAN Yingsheng, Et al., Theory and simulation of STATCOM for damping subsynchronous oscillation of a multi-machine system, Power System Protection and Control, 50, 6, pp. 23-32, (2022)
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