弱电网下改进LADRC抑制直驱风机次同步振荡研究  

Inhibition of Subsynchronous Oscillation of Direct-Drive Wind Turbine by Improved LADRC in Weak Grids

作　　者：李博浩 郭昆丽[1] 吕家君 蔡维正 刘璐豪 刘凤仪 郝翊帆 LI Bohao;GUO Kunli;LV Jiajun;CAI Weizheng;LIU Luhao;LIU Fengyi;HAO Yifan(School of Electronics and Information,Xi’an Polytechnic University,Xi’an 710048,China;Guangzhou Power Supply Bureau of Guangdong Power Grid Co.,Ltd.,China Southern Power Grid,Guangzhou 510620,China)

机构地区：[1]西安工程大学电子信息学院,陕西西安710048 [2]南方电网广东电网有限责任公司广州供电局,广东广州510620

出　　处：《中国电力》2023年第4期56-67,共12页Electric Power

基　　金：陕西省教育厅科研计划资助项目(21JK0655)。

摘　　要：针对在弱电网下直驱风电机组引起的次同步振荡(subsynchronousoscillation,SSO)现象,提出基于一阶总扰动偏差控制的微分前馈线性自抗扰控制器(linear active disturbance rejection control,LADRC),采用全改进LADRC控制策略抑制SSO现象(“全”是指电压外环、电流内环以及PLL锁相环3个环节都采用相应的控制)。首先,建立直驱风电机组并网数学模型;其次,结合风电机组并网系统对改进LADRC控制器进行设计并对其进行特性分析,该控制器相较于传统LADRC,不仅减小系统的跟踪误差且抗干扰性能更强;最后,通过PSCAD/EMTDC仿真软件将本文策略与全PI、全传统LADRC进行仿真对比。结果表明:相较于全传统LADRC,本文方法在降低1.62%超调量的同时,缩短0.129 s系统调节时间,有效抑制SSO现象并且具有较好的适应性。As the direct-drive wind turbine generator system (WTGS) causes subsynchronous oscillation (SSO) in weak grids, thispaper proposes the differential feed-forward linear active disturbance rejection control (LADRC) based on the first-order totaldisturbance deviation control. It uses the fully improved LADRC strategy to suppress the SSO phenomenon (here, “fully”indicates that the outer loop of voltage, the inner loop of current, and the phase-locked loop (PLL) are all controlled accordingly).Firstly, the mathematical model for the grid connection of the direct-drive WTGS is built. Secondly, the improved LADRC isdesigned, and its characteristics are analyzed in combination with the grid-connected system of WTGS. The analysis shows that theimproved control not only reduces the tracking error of the system but also has stronger anti-interference performance compared withthe traditional LADRC. Finally, the proposed strategy is compared with the fully proportional-integral (PI) control and all-traditionalLADRC by simulation software PSCAD/EMTDC. The results indicate that compared with the traditional LADRC, the proposedmethod reduces the overshoot by 1.62% while shortening the system regulation time by 0.129 s, which can effectively suppress theSSO phenomenon and have good adaptability.

关 键 词：弱电网 直驱风电机组 次同步振荡 总扰动偏差控制 微分前馈 LADRC 

分 类 号：TM712[电气工程—电力系统及自动化] TM614