直驱风电并网系统的两类次同步振荡特性分析
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1.广东省新能源电力系统智能运行与控制企业重点实验室,南方电网科学研究院有限责任公司;2.华南理工大学电力学院

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M712

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广东省新能源电力系统智能运行与控制企业实验室开放(GPKLIOCNEPS-2021-KF-01)


Analysis of Two Kinds of Sub-Synchronous Oscillations Characteristics of Direct-Drive Wind Power Grid-Connected System
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Guangdong Provincial Key Laboratory of Intelligent Operation and Control for New Energy Power System, Electric Power Research Institute, China Southern Power Grid

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    摘要:

    针对直驱风机并网系统,基于特征值分析法研究了两类特性不同的次同步振荡模式,揭示了不同振荡模式的主导环节及关键影响因素。首先,建立了直驱风电并网系统的线性化小信号模型并验证了模型的准确性。其次,识别了两类特性不同的次同步振荡模式,探讨电气强度变化对两类振荡模式特性的影响,通过参与因子分析得到与两类振荡模式密切相关的动态环节;然后,采用根轨迹法考察关键控制参数变化对两类振荡模式的影响情况,发现其高频模式的激发取决于直流电压控制和直流环节,而其低频模式则与电气强度、锁相环关系紧密。最后,采用时域仿真验证了两类次同步振荡特性分析的正确性。相关研究可为直驱风电并网系统动态特性认识、变流器控制参数整定提供参考。

    Abstract:

    For direct-drive permanent magnetic synchronous generators (D-PMSGs) grid-connected system, two different sub-synchronous oscillation modes with distinctive characteristics are analyzed by eigenvalue analysis. The dominant link and key influencing factors of each oscillation mode are revealed. Firstly, a linearized small-signal model of the D-PMSGs grid-connected system is established and compared with the detailed model in the PSCAD/EMTD to verify its accuracy. Secondly, by analyzing the eigenvalues of the small-signal model, two types of sub-synchronous oscillation modes with different characteristics are obtained. Furthermore, the root locus method is used to investigate the effect of parameter changes on two types of oscillation modes according to the link which is closely related to the oscillation mode determined by the participation factor. It is found that the excitation of the high-frequency mode depends on the DC voltage control and DC link, while the low-frequency mode is closely related to the grid strength and the phase-locked loop. Finally, the correctness of the analysis including two types of sub-synchronous oscillation characteristics is validated through time-domain simulation. This research provides a reference for recognizing the dynamic characteristics and tuning the inverter control parameters of D-PMSGs grid-connected system.

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廖梦君,陈乐柯,朱林,等. 直驱风电并网系统的两类次同步振荡特性分析[J]. 科学技术与工程, , ():

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  • 收稿日期:2023-08-04
  • 最后修改日期:2023-11-08
  • 录用日期:2023-12-02
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