直驱风电场中SVG电压前馈阻抗重构抑制次/超同步振荡方法  

SVG voltage feedforward impedance reconstruction method for suppressing sub-/super-synchronous oscillation in D-PMSGs based wind farm

作　　者：杨飞[1] 陈燕东[1] 符有泽 伍文华[1] 徐元璨 YANG Fei;CHEN Yandong;FU Youze;WU Wenhua;XU Yuancan(National Electric Power Conversion and Control Engineering Technology Research Center,Hunan University,Changsha 410082,China)

机构地区：[1]湖南大学国家电能变换与控制工程技术研究中心,湖南长沙410082

出　　处：《电力自动化设备》2022年第8期153-159,214,共8页Electric Power Automation Equipment

基　　金：国家自然科学基金资助项目(52077070,52007058)。

摘　　要：直驱风电场在中低频段内呈现负阻值容性的阻抗外特性,当接入呈感性的弱电网时会相互耦合引起次/超同步振荡,不利于新能源的稳定消纳与电网的安全运行。为抑制风电场的次/超同步振荡,提出一种直驱风电场中静止无功发生器(SVG)阻抗重构控制方法。通过在风电场中的SVG控制系统内加入带通滤波器的电压前馈控制进行阻抗重构,提高风电场并网稳定性。利用谐波线性化方法,建立含所提阻抗重构控制SVG的直驱风电场序阻抗模型。基于所建立的阻抗模型和所提出的阻抗稳定性判据,对比分析未采用SVG阻抗重构控制和所提控制方法的直驱风电场的稳定性。结果表明当采用所提控制方法时,风电场在40~100 Hz频段内呈现正阻值特性,且降低了系统的容性特性,抑制了风电场次/超同步振荡,同时可以改善风电场中因并网风电机组数量增加所带来的振荡问题。最后,通过仿真验证了所提方法对抑制风电场次/超同步振荡的有效性与正确性。The D-PMSGs(Direct-drive Permanent Magnetic Synchronous Generators)based wind farm exhibits negative resistance and capacitive out-of-impedance characteristics in the middle and low frequency bands.When connected to the inductive weak grid,they are coupled with each other and causing sub-/super-synchronous oscillation,which is not conducive to the stable consumption of new energy and the safe opera‐tion of power grid.In order to suppress the sub-/super-synchronous oscillation of wind farm,an impedance reconfiguration control method for SVG(Static Var Generator)in D-PMSGs based wind farm is proposed.The voltage feedforward control of band-pass filter is added to SVG control system in wind farm to recon‐struct the impedance,which can improve the grid-connected stability of wind farm.Using the harmonic linea-rization method,the sequence-impedance model of D-PMSGs based wind farm with SVG adopting the pro‐posed impedance reconstruction control is established.Based on the established impedance model and the proposed impedance stability criterion,the stability of D-PMSGs based wind farm without SVG impedance reconstruction control and with the proposed control method is compared and analyzed.The results show that when adopting the proposed control method,the wind farm presents positive resistance characteristics in the frequency band of 40~100 Hz,so that reducing the capacitive characteristics of system,and suppres-sing the sub-/super-synchronous oscillation of wind farm,meanwhile it can improve the oscillation problem caused by the increasing number of grid-connected wind turbines.Finally,the effectiveness and correctness of the proposed method for suppressing the sub-/super-synchronous oscillation of wind farms are verified by simulation.

关 键 词：直驱风电场 SVG 阻抗重构 序阻抗建模 小信号稳定性分析 弱电网 

分 类 号：TM712[电气工程—电力系统及自动化]