用于风电场小干扰稳定性检验的降阶模式计算方法

doi:10.19595/j.cnki.1000-6753.tces.200158

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摘要考虑到在大型风电场规划阶段,如对所有方案采用全阶模型进行小干扰稳定性检验,会导致工作量大、效率低,不利于寻求最优方案,该文提出一种降阶模式计算方法。首先,建立风电场全阶线性化状态空间模型。然后,考虑风电场规划阶段,可对所选型号的风电机组（WTG）采用典型模型和参数,认为各WTG动态特性近似相同。通过对风电场线性化模型中的变量做等效变换,将N台WTG构成的风电场等效为N个相互独立的等效子系统。各等效子系统由一台并网WTG构成。根据等效子系统线性化状态空间模型的构建方式,提出一种用于风电场小干扰稳定性检验的降阶模式计算方法,可有效降低规划阶段风电场模式分析的计算量,且所得结果准确。最后,通过仿真算例,验证了所提方法的有效性。

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关键词 ：风电场, 线性化状态空间模型, 小干扰稳定性检验, 模式分析, 等效子系统

Abstract：In the planning stage of a large-scale wind farm, if the small-signal stability of all the schemes is examined by using full-order model, the large workload and low working efficiency will affect the solving of the optimal scheme, thus in this paper, a reduced-order modal computation method was proposed. The full-order linearized state-space model was established at first. Secondly, it was considered that in the planning stage of a wind farm, typical model and parameters of the type of wind turbine generator (WTG) selected could be used and the dynamics of the WTGs were similar. Thus a wind farm comprised of N WTGs could be equivalently decoupled into N independent subsystems through equivalent transformation on the variables of the linearized model. Each subsystem was comprised of a single grid-connected WTG. According to the state-space model of the equivalent subsystems, a reduced-order modal computation (ROMC) method was proposed, which could be used to exam the small-signal stability of a wind farm in planning stage accurately with computational burden obviously reduced. Finally, the effectiveness of the method proposed was validated through study cases.

Key words： Wind farm linearized state-space model small-signal stability examination modal analysis equivalent subsystem

收稿日期: 2020-02-19

PACS:

TM712

基金资助:国家电网公司科技项目资助（5100-202036013A-0-0-00）

通讯作者: 杜文娟女,1979年生,博士,教授,研究方向为电力系统稳定性分析与控制。E-mail：ddwenjuan@qq.com

作者简介: 董文凯男,1992年生,博士研究生,研究方向为风电场动态等值与小干扰稳定性。E-mail：596167281@qq.com

引用本文:

董文凯, 杜文娟, 王海风. 用于风电场小干扰稳定性检验的降阶模式计算方法[J]. 电工技术学报, 2021, 36(7): 1468-1479. Dong Wenkai, Du Wenjuan, Wang Haifeng. Reduced-Order Modal Computation Method for Small-Signal Stability Examination of a Wind Farm. Transactions of China Electrotechnical Society, 2021, 36(7): 1468-1479.

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