基于SVG附加电流反馈阻抗重塑的双馈风电场次/超同步振荡抑制策略  

Suppression Strategy of Sub/Super-synchronous Oscillations in Doubly-Fed Wind Farm Based on SVG Additional Current Feedback Impedance Reshaping

作　　者：王泽嘉 韩民晓[1] 范溢文 WANG Zejia;HAN Minxiao;FAN Yiwen(School of Electrical and Electronic Engineering,North China Electric Power University,Beijing 102206,China)

机构地区：[1]华北电力大学电气与电子工程学院,北京102206

出　　处：《中国电力》2024年第8期55-66,共12页Electric Power

基　　金：国家电网有限公司科技项目(5100-202199533A-0-5-ZN)。

摘　　要：双馈风电场易与电网相互作用引起次/超同步振荡,针对目前抑制振荡时阻抗重塑法适应性不强的问题,提出一种基于静止无功发生器(SVG)附加电流反馈控制的阻抗重塑法,该方法建立的虚拟阻抗可跟随风电场的阻抗特性变化而改变,其灵活性强于通过建模分析设计出的固定虚拟阻抗。首先,基于SVG和风电场并网阻抗模型推导了该方法所加入的虚拟阻抗公式。然后,根据阻频特性分析了该方法的有效性以及阻抗重塑控制参数对抑制效果的影响。最后,根据青海省某双馈风电场并网模型,在PSCAD/EMTDC中建立了电磁暂态仿真模型,仿真结果表明:所提方法可以在不同振荡情况下实现对场站的阻抗重塑,灵活抑制风电场次/超同步振荡。Doubly-fed wind farm often interacts with the power grid,leading to sub/super-synchronous oscillations.To address the issue of limited adaptability in suppressing these oscillations using impedance reshaping methods,this paper proposes an impedance reshaping method based on a static var generator(SVG)-additional current feedback control.The virtual impedance established by this method is correlated with the impedance characteristics of the wind farm,providing greater flexibility compared with fixed virtual impedance obtained through modeling and analytical design.Initially,the virtual impedance formulation,incorporating the SVG and wind farm grid-connected impedance models,is derived.Subsequently,the effectiveness of the proposed method and the impact of impedance reshaping control parameters on the suppression performance are analyzed based on impedance frequency characteristics.Finally,based on the grid-connected model of a doubly-fed wind farm in Qinghai Province,an electromagnetic transient simulation model is developed in PSCAD/EMTDC.The simulation results demonstrate that the proposed method achieves impedance reshaping for the wind farm under different oscillation conditions,effectively suppressing sub/super-synchronous oscillations in the wind farm.

关 键 词：风电场 次/超同步振荡 静止同步补偿器 振荡抑制 阻抗重塑 

分 类 号：TM614[电气工程—电力系统及自动化] TM712