基于构网型SVG控制优化的双馈风场高频谐振抑制分析  

Analysis of High-Frequency Resonance Suppression in Doubly-Fed Wind Farms Based on Grid-Forming SVG Control Optimization

作　　者：刘延龙 陈晓光 姚爽爽 陈继开[2] LIU Yanlong;CHEN Xiaoguang;YAO Shuangshuang;CHEN Jikai(State Grid Heilongjiang Electric Power Research Institute,Harbin 150000,China;School of Electrical Engineering,Northeast Electric Power University,Jilin 132012,Jilin Province,China)

机构地区：[1]国网黑龙江省电力有限公司电力科学研究院,哈尔滨市150000 [2]东北电力大学电气工程学院,吉林省吉林市132012

出　　处：《电力建设》2024年第11期125-136,共12页Electric Power Construction

基　　金：国家电网有限公司科技项目“考虑风场物理特性的风电区域系统中高频谐振问题分析与主动抑制研究”(52243724000L);国家自然科学基金项目(52077030)。

摘　　要：含跟网型(grid-following,GFL)静止无功发生器(static var generator,SVG)的双馈风场内集电电缆投入后可能出现高频振荡问题。针对这一问题,利用谐波线性化方法分别建立双馈风机(doubly-fed induction generator,DFIG)、构网型(grid-forming,GFM)SVG和跟网型SVG的序阻抗模型。基于所建风场联合序阻抗模型进行阻抗分析发现,由于跟网型SVG在高频段呈现容性特征,投入集电电缆后风场系统高频段阻抗呈现负阻尼特性,导致高频谐振发生风险增高。与无电流内环的构网型SVG相比,含电流内环的构网型SVG不但动态响应速度快,而且具有虚拟阻抗限流等功能,因此提出一种基于构网型双环SVG虚拟阻抗优化的风电场高频谐振抑制措施,通过虚拟阻抗优化实现对系统整体阻抗的重塑,进而抑制高频谐振的发生。最后,通过仿真验证了理论分析和所提高频谐振抑制方法的正确性。High-frequency resonance occurs after a no-load line is operated in a doubly fed wind farm with a gridfollowing(GFL)static var generator(SVG).To solve this problem,the harmonic linearization method was used to establish the sequence impedance models of a doubly fed induction generator(DFIG),grid-forming(GFM)SVG,and grid-following SVG.Based on the established joint sequence impedance model of the wind farm,impedance analysis shows that the capacitive characteristics of the grid-following SVG in the high-frequency band result in the high-frequency impedance of the wind farm system exhibiting negative damping characteristics after the no-load line is put into operation.This situation increases the risk of high-frequency resonance.In comparison to the grid-forming SVG without the current inner loop,the GFM SVG with the current inner loop not only demonstrates a fast dynamic response speed but also provides the function of virtual impedance current limiting.Therefore,a high-frequency resonance suppression method for wind farms based on virtual impedance optimization of a GFM double-loop SVG is proposed.By optimizing virtual impedance,the overall impedance of the system was reshaped,thereby inhibiting the occurrence of high-frequency resonances.Finally,the correctness of the theoretical analysis and the proposed high-frequency resonance suppression method was verified through simulation.

关 键 词：构网型(GFM) 静止无功发生器(SVG) 双馈风场 高频谐振抑制 

分 类 号：TM614[电气工程—电力系统及自动化]