直驱风电场并网对火电机组次同步谐振影响

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摘要

直驱风电场（direct-drive wind farm,D-DWF）接入火电经串补送出系统后,其对火电机组的次同步谐振（subsynchronous resonance,SSR）影响机理尚不明确。本文针对风火打捆经串补点对网型系统,采用适用于模块化建模的状态变量消去方法,建立模块化的耦合小信号模型;利用特征值分析法研究D-DWF接入后系统的SSR情况;结合特征值分析结果阐释SSR机理,并针对D-DWF及串补线路参数进行阻尼分析。研究结果表明：D-DWF会引入与SSR频率相近并引起“共振”的一个新模态,使得“机电谐振”与“模态频率接近”的振荡机理耦合共存。在跟网型风机的控制策略及参数下,D-DWF并入会导致SSR模态阻尼大幅降低,恶化系统的SSR。随着D-DWF的容量、风速和系统串补度降低,系统阻尼将提高,SSR的风险降低。基于PSCAD/EMTDC平台的电磁暂态仿真,验证了机理分析的正确性。

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	高本锋
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关键词 ：直驱风电场, 串联补偿, 风火打捆, 特征值分析, 次同步谐振

Abstract：

After the direct-drive wind farm (D-DWF) is connected to the thermal power through series replenishment system, its influence mechanism on the subsynchronous resonance (SSR) of the thermal power unit is not clear. In this paper, a modular coupling small signal model is established by using the method of state variable eliminationfor modular modeling for the wind-thermal bundled and series complement point pair grid system.The SSR situation of the D-DWF system after D-DWF access is studied by eigenvalue analysis. The SSR mechanism is explained by combining the eigenvalue analysis results, and the damping analysis is carried out for D-DWF and series complement line parameters. The results show that D-DWF introduces a new mode that is close to the SSR frequency and causes "resonance", so that the oscillation mechanism of "electromechanical resonance" and "modal frequency close" can be coupled and coexisted. Under the control strategy and parameters of the grid-following wind turbine, the incorporation of D-DWF will lead to a significant reduction in SSR modal damping and worsen the SSR of the system. As the capacity, wind speed, and system string complement of the D-DWF decrease, the system damping will increase and the risk of SSR will decrease. The electromagnetic transient simulation based on the PSCAD/EMTDC platform verifies the correctness of the mechanism analysis.

Key words： direct-drive wind farm series compensation wind-thermal bundled eigenvalue analysis SSR

收稿日期: 2023-03-22

PACS:

TM712

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, 刘王锋, 董靓媛, 张蕊. 直驱风电场并网对火电机组次同步谐振影响[J]. 电工技术学报, 0, (): 8927-. Gao Benfeng, Liu Peixin, Liu Wangfeng, Dong Liangyuan, Zhang Rui. Influence of Grid-connected Direct-Drive Wind Farm on Subsynchronous Resonance of Thermal Power Units. Transactions of China Electrotechnical Society, 0, (): 8927-.

链接本文:

https://dgjsxb.ces-transaction.com/CN/Y0/V/I/8927

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