构网/跟网型混合风电场次同步振荡特性理分析

doi:10.19595/j.cnki.1000-6753.tces.240359

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摘要基于匹配控制策略的构网型直驱风电场部分替代跟网型直驱风电场后,匹配构网型风机对形成的混合风电场次同步振荡（SSO）影响机理尚不明确。该文针对混合风电场中跟网型风机引发SSO的场景,建立混合风电场并网系统的小信号模型,基于特征值分析法分析混合风电场中的主导SSO模态及其参与因子,采用阻尼转矩法揭示匹配构网型风机占比对混合风电场SSO的振荡影响机理。结果表明：匹配构网型风机在主导SSO模式下可以改善混合风电场的阻尼特性,对跟网型风电场引发的SSO起到抑制效果;虽然匹配构网型风机占比增加会降低混合风电场的SSO的发生风险,但是其参数几乎不参与此主导SSO模态,跟网型风电场内部参数是主导的参与因子;典型占比下,通过增大直流母线电容参数、减小锁相环比例系数、增大电流内环的积分系数,可降低SSO的发生风险,基于PSCAD/EMTDC仿真平台验证了理论分析的可靠性。

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	高本锋
	刘培鑫
	孙大卫
	王潇
	吴林林
	邓鹏程
	郑展翔
	巨孟沁

关键词 ：匹配控制, 混合风电场, 次同步振荡, 占比

Abstract：With the increasing penetration rate of new energy units, the power system has more oscillation accidents with grid-following direct-drive wind farms. Compared with the grid-following control, the grid- forming control has suitable voltage and frequency support capabilities, and wind energy can be transmitted through the hybrid wind farm where the two controls coexist. After the grid-forming direct-drive wind farm based on the matching control strategy partially replaces the grid-following one, the influence mechanism of the hybrid wind farm subsynchronous oscillation (SSO) formed by the match-grid-forming wind turbine needs to beclarified.
This paper first introduces the match-grid-forming control, the grid-following control, and the topology of the hybrid wind farm. Based on the mathematical model of the grid-connected system, the small signal model of the system is constructed in Matlab/Simulink simulation using the modular modeling method. Then, the small signal model of the grid-connected system is analyzed, the dominant SSO mode and its participating factors areanalyzed from the wind turbine proportion perspective, and the influence of match-grid-forming wind turbines on SSO is explained from the damping perspective. Finally, regarding root trajectory and electromagnetic transient time-domain response, the changes in SSO characteristics under different operating parameters are analyzed.
After the SSO triggered by the grid-following wind farm occurs in the hybrid wind farm, the parameters of the grid-following wind farm are mainly involved in the dominant SSO mode, and the participation of the match-grid-forming wind farm and the AC grid parameters is limited. With the increase of match-grid-forming wind turbines in the hybrid wind farm, the eigenroots of the dominant SSO mode gradually decrease, and the oscillation frequency in creases in the range of about 1 Hz. Moreover, the damping of hybrid wind farms increases in the subsynchronous frequency band. There is a damping minimum in the damping frequency characteristic curve, and the risk of SSO at this frequency is the greatest in the system.
The conclusions are as follows. (1) The SSO caused by the grid-following wind turbine in the hybrid wind farm is mainly related to the parameters of the grid-following wind farm, which are rarely involved in the SSO mode. (2) Match-grid-forming wind turbines can improve the system’s damping in hybrid wind farms. When SSO occurs in a hybrid wind farm, the match-grid-forming wind turbine can play a restraining role. The proportion of match-grid-forming fans increases, and the inhibition effect also increases. However, the effect is weakened, and the proportion of match-grid-forming fans is appropriate at 20%. (3) Only when the proportion of match- grid-forming fans increases, can the SSO of grid-following fans be inhibited significantly. The parameters can be optimized based on the grid-following wind farms: within a specific range, increase the DC bus capacitance parameter C_DC, decrease the phase-locked loop proportionality factor, and increase the integration coefficient of PI_3L in the current inner loop T_i3L.

Key words： Matching control hybrid wind farms subsynchronous oscillation (SSO) percentage

收稿日期: 2024-03-06

PACS:

TM712

基金资助:华北电力科学研究院有限责任公司科技项目资助（KJZ2023123）

通讯作者: 刘培鑫男,2000年生,硕士研究生,研究方向为电力系统次同步振荡。E-mail: liupeixin2022@126.com

作者简介: 高本锋男,1981年生,副教授,研究方向为高压直流输电和电力系统次同步振荡。E-mail: gaobenfeng@126.com

引用本文:

高本锋, 刘培鑫, 孙大卫, 王潇, 吴林林, 邓鹏程, 郑展翔, 巨孟沁. 构网/跟网型混合风电场次同步振荡特性理分析[J]. 电工技术学报, 2025, 40(6): 1945-1959. Gao Benfeng, Liu Peixin, Sun Dawei, Wang Xiao, Wu Linlin, Deng Pengcheng, Zheng Zhanxiang, Ju Mengqin. Analysis of Subsynchronous Oscillation Characteristics and Mechanism of Grid-Forming/Grid-Following Hybrid Wind Farms. Transactions of China Electrotechnical Society, 2025, 40(6): 1945-1959.

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