摘要
针对新能源场站中的中高频振荡问题,提出了一种改进的构网型换流器控制策略。首先,基于谐波线性化方法建立该换流器的序阻抗模型,并分析主电路参数与控制参数对换流器中高频阻抗特性的影响。其次,采用分散稳定性判据对系统稳定性进行分析,降低了传统稳定性分析的保守性与计算复杂度。再次,将所提改进型构网型换流器应用于构网型变流器占比低的系统场景,与传统的虚拟同步发电机相比,其在抑制系统中高频振荡方面表现更优。最后,通过实时数字仿真软件对所提方法及分析结果的有效性与正确性进行了验证。
To address the issue of medium/high-frequency oscillations in renewable energy stations,an improved control strategy for grid-forming converters is proposed.First,based on the harmonic linearization method,the sequence impedance model of the converter is established,and the influence of main circuit parameters and control parameters on the medium/high-frequency impedance characteristics of the converter is analyzed.Second,the decentralized stability criterion is applied to analyze system stability,reducing the conservatism and computational complexity of traditional stability analysis.Furthermore,the proposed improved grid-forming converter is applied to systems with a low proportion of grid-forming converters.Compared with traditional virtual synchronous generators,it demonstrates superior performance in suppressing medium/high-frequency oscillations.Finally,the effectiveness and correctness of the proposed method and analysis results are validated using real-time digital simulation software.
作者
金国彬
张皓然
杨明城
李玲
党若峰
蒙昌鑫
JIN Guobin;ZHANG Haoran;YANG Mingcheng;LI Ling;DANG Ruofeng;MENG Changxin(Key Laboratory of Modern Power System Simulation and Control&Renewable Energy Technology,Ministry of Education(Northeast Electric Power University),Jilin 132012,China)
出处
《智慧电力》
北大核心
2026年第3期65-74,共10页
Smart Power
基金
国家重点研发计划资助项目(2021YFB2400900)
云南省自然科学基金重大项目(202301AS070055)。
关键词
中高频振荡
构网型换流器
自抗扰控制
分散稳定性判据
medium/high-frequency oscillations
grid-forming converters
active disturbance rejection control
decentralized stability criterion
