次同步电流双通道附加阻尼抑制次同步振荡策略及阻抗模型分析  

Subsynchronous Current Dual Channel Additional Damping Suppression Subsynchronous Oscillation Strategy and Impedance Model Analysi

作　　者：李博浩 郭昆丽[1] 吕家君 蔡维正 白阳 任蓓蕾 朱婷华 LI Bohao;GUO Kunli;LYU Jiajun;CAI Weizheng;BAI Yang;REN Beilei;ZHU Tinghua(College of Electronics and Information,Xian Polytechnic University,Xian 710048,Shaanxi Province,China;Leshan Power Supply Company,State Grid Sichuan Electric Power Company,Leshan 614000,Sichuan Province,China)

机构地区：[1]西安工程大学电子信息学院,陕西省西安市710048 [2]国网四川省电力公司乐山供电公司,四川省乐山市614000

出　　处：《分布式能源》2023年第6期1-10,共10页Distributed Energy

基　　金：中国纺织工业联合会科技指导性计划项目(2022086);陕西省教育厅科研计划项目(21JK0655)。

摘　　要：针对弱电网下直驱风电机组引起的次同步振荡现象,提出一种基于次同步电流双通道附加阻尼策略进行抑制。首先,验证弱电网对次同步振荡的影响;其次,结合直驱风机接入弱电网从系统提取次同步电流分析抑制机理,设计附加阻尼控制器结构及其参数;然后,建立计及频率耦合附加阻尼控制环节的阻抗模型并验证其稳定性;最后,将本文策略与无阻尼控制和传统单通道阻尼控制进行仿真对比。结果表明,相较于无阻尼控制和单通道阻尼控制,本文方法在减小次同步振荡波动范围的同时,更加有效地抑制次同步振荡现象并且具有较好的适应性。Aiming at the phenomenon of subsynchronous oscillation(SSO)caused by direct drive wind turbines under weak power grid,a dual-channel additional damping strategy based on subsynchronous current is proposed for suppression.Firstly,the influence of weak power grid on SSO is verified,and secondly,combined with the direct drive fan connected to the weak power grid to extract subsynchronous current from the system to analyze the suppression mechanism,the structure of additional damping controller and its parameters are designed.Then,an impedance model considering the frequency coupling additional damping control link is established and its stability is verified.Finally,the proposed strategy is simulated and compared with undamped control and traditional singlechannel damped control.The results show that compared with undamping control and single-channel damping control,the proposed method reduces the SSO fluctuation range,suppresses SSO phenomenon more effectively and has better adaptability.

关 键 词：弱电网 直驱风电机组 次同步振荡 附加阻尼抑制 

分 类 号：TK81[动力工程及工程热物理—流体机械及工程]