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考虑高渗透率风电和SVG作用的电网暂态特性研究

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随着风能接入电网规模的逐渐增大,风电不同渗透率集中接入电网对送端同步发电机组的暂态功角稳定的影响是亟待解决的问题.从同步发电机组电磁功率角度出发,给出了一种风电场接入多机系统的暂态稳定分析方法.当系统出现对称短路故障时,探究风电机组接入前后电磁功率的变化从而判断同步机组功角的变化.引入风电接入比例系数k,研究不同风电接入比例对系统暂态功角的影响.同时考虑SVG的无功补偿作用,采用扩展等面积法则(EEAC)探讨SVG加入前后对系统初始功角的影响.最后,利用电力系统仿真软件PSS/E基于多机系统进行仿真验证.研究得到,DFIG机组的接入会增加系统的功角稳定性,随着风电渗透率的增加,系统功角稳定性会先增大后降低,且SVG的接入会使系统初始功角增大,对系统暂态稳定性起积极作用.
Study on Transient Characteristics of Power Grid Considering the Effects of High-proportion Wind Generations and SVG
As the proportion of wind generations integrated into power grids gradually increases,the influence of grid con-nection of different penetration ratios of wind generations on the transient power angle stability of synchronous generator units at the sending end is an urgent problem to be solved.A transient stability analysis method for wind farms connected to multigenerator systems is proposed from the perspective of electromagnetic power of synchronous generator sets.The method explores the changes in pre-and post-grid-connection electromagnetic power of the wind turbine to determine the changes in the power angle of the synchronous unit when the system encounters a symmetrical short circuit fault.By intro-ducing wind generation grid connection proportion coefficient k,the influence of k on the transient power angle is studied.Furthermore,considering the reactive power compensation effect of SVG,the influence of the participation of SVG on ini-tial power angle is analyzed using the extended equal area rule(EEAC).Finally the power system simulation software PSS/E is used for simulative verification based on a multi-generator system.It can be concluded that the integration of DFIG units will increase the power angle stability of the system.With the increase of wind generation permeability,the power angle stability of the system will increase first and then decrease.Moreover,the involve of SVG will increase the in-itial power angle of the system,bringing about a positive effect on the transient stability of the system.

DFIGtransient power angle stabilitywind generation proportionextended equal area rule(EEAC)SVG

郑娇娇、何鑫、刘翠、周鑫、王德林

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西南交通大学电气工程学院,四川成都 611756

云南电网有限责任公司电力科学研究院,云南 昆明 650217

双馈风机 暂态功角稳定 风电接入比例 扩展等面积法则 无功补偿

2024

电工技术
重庆西南信息有限公司(原科技部西南信息中心)

电工技术

影响因子:0.177
ISSN:1002-1388
年,卷(期):2024.(22)