不同构网型双馈风电机组的阻抗建模与并网稳定性分析OA
Impedance Modeling and Grid-connection Stability Analysis of Various Grid-forming DFIG-based Wind Turbines
构网型控制策略使变流器能够以等效电压源的形式接入电网,从而赋予系统对电压与频率的主动支撑能力.目前,针对双馈风电机组已有多种构网型控制架构被提出,但不同构网型双馈风电机组小扰动稳定特性的差异性尚不明确.文中针对5种具有代表性的构网型双馈风电机组,对其宽频阻抗特性及并网稳定性进行比较.首先,建立了不同构网型双馈风电机组统一形式的精细化宽频阻抗模型,并通过仿真扫频验证其准确性;其次,对比研究了不同构网型控制策略及控制参数对双馈风电机组宽频阻抗特性的影响,并揭示了虚拟同步发电机控制与惯性同步控制的内在机理差异;在此基础上,基于广义奈奎斯特判据分析了电网强度和关键控制参数对不同构网型双馈风电机组并网稳定性的影响规律.最后,通过时域仿真结果验证了理论分析的正确性.
Grid-forming control allows the converter to be connected to the power grid as an equivalent voltage source,thereby enabling the system to actively support voltage and frequency.Currently,various grid-forming control strategies have been proposed for doubly-fed induction generator(DFIG)based wind turbines(WTs).However,the differences in small-disturbance stability characteristics among various grid-forming DFIG-based WTs remain unclear.This paper conducts a comparative study on the wideband impedance characteristics and grid-connection stability of five representative grid-forming DFIG-based WTs.Firstly,a unified form of an accurate wideband impedance model for various grid-forming DFIG-based WTs is established,whose accuracy is validated through frequency-scanning simulation.Secondly,the influences of various grid-forming control strategies and control parameters on the wideband impedance characteristics of DFIG-based WTs are comparatively analyzed.The intrinsic mechanistic differences between virtual synchronous generator control and inertial synchronization control are elucidated.On this basis,the generalized Nyquist criterion(GNC)is employed to investigate the influence rules of power grid strength and key control parameters on the grid-connection stability of various DFIG-based WTs.Finally,the correctness of the theoretical analysis is verified through time-domain simulation results.
潘云祥;吕敬;王晗;蔡旭;刘文飞
电力传输与功率变换控制教育部重点实验室(上海交通大学),上海市 200240电力传输与功率变换控制教育部重点实验室(上海交通大学),上海市 200240电力传输与功率变换控制教育部重点实验室(上海交通大学),上海市 200240电力传输与功率变换控制教育部重点实验室(上海交通大学),上海市 200240国网甘肃省电力公司电力科学研究院,甘肃省 兰州市 730070
双馈风电机组构网型控制阻抗稳定性虚拟同步发电机惯性同步控制弱电网
doubly-fed induction generator based wind turbinesgrid-forming controlimpedancestabilityvirtual synchronous generatorinertia synchronization controlweak power grid
《电力系统自动化》 2026 (6)
48-61,14
国家重点研发计划资助项目(2022YFB2402703)国家电网公司科技项目(52272222001J). This work is supported by National Key R&D Program of China(No.2022YFB2402703)and State Grid Corporation of China(No.52272222001J).
评论