基于主导变量阻尼控制的双馈风电场次同步振荡抑制  

Sub-synchronous Oscillation Suppression for Doubly-fed Wind Farm Based on Dominant Variable Damping Control

作　　者：韩平平[1] 王欢[1] 王希 崔晓丹 吴家龙 HAN Pingping;WANG Huan;WANG Xi;CUI Xiaodan;WU Jialong(Anhui Province Key Laboratory of Renewable Energy Utilization and Energy Saving(Hefei University of Technology),Hefei 230009,China;State Key Laboratory of Smart Grid Protection and Control,Nanjing 211106,China)

机构地区：[1]新能源利用与节能安徽省重点实验室(合肥工业大学),合肥230009 [2]智能电网保护和运行控制国家重点实验室,南京211106

出　　处：《电力系统及其自动化学报》2022年第1期26-37,75,共13页Proceedings of the CSU-EPSA

基　　金：智能电网保护和运行控制国家重点实验室开放基金资助项目(SGNR0000KJJS2007629)。

摘　　要：针对双馈风电场经串联电容补偿线路进行输电时,可能发生并网系统的次同步振荡问题。本文首先根据双馈风电场经串联电容补偿并网系统的数学模型建立系统小扰动方程,并通过特征值分析法得到双馈风电场次同步振荡的主导变量。然后,根据系统等效阻抗模型和转子侧控制结构图对主导变量参与次同步振荡的机理进行分析,提出在控制系统中设置由功率阻尼控制模块和电流比例微分阻尼控制模块组成的转子电压补偿器的双馈风电场次同步振荡抑制方法。该方法作用在双馈风机转子侧变换器上,无须增加其他装置,便于在实际工程中应用。最后,通过离线仿真和半实物仿真验证了该抑制方法的有效性。Sub-synchronous oscillation may occur in a grid-connected system when a doubly-fed wind farm transmits power through series capacitor compensation lines.Based on the mathematical model of a series capacitance-compensat⁃ed grid-connected system of doubly-fed wind farm,the small disturbance equation for the system is established,and the dominant variables of the sub-synchronous oscillation in the doubly-fed wind farm are obtained by the eigenvalue analy⁃sis method.According to the equivalent impedance model of the system and the rotor-side control chart,the dominant variables involved in the sub-synchronous oscillation mechanism are analyzed.On this basis,a sub-synchronous oscilla⁃tion suppression method for doubly-fed wind farm is set in the control system,in which the rotor voltage compensator is composed of a power damping control module and a current proportional differential damping control module.This meth⁃od is applied to the rotor-side converter of the doubly-fed fan without adding other devices,which is easy to be applied in practical engineering.Finally,offline and hardware-in-the-loop(HIL)simulations were performed to verify the effec⁃tiveness of the proposed suppression method.

关 键 词：双馈风电场 次同步振荡 特征值分析法 主导变量 抑制方法 半实物仿真 

分 类 号：TM615[电气工程—电力系统及自动化]