基于自适应准谐振控制的DFIG-GSC次同步振荡抑制策略研究  

Research on sub-synchronous oscillation suppression strategy of DFIG-GSC based on adaptive quasi-resonant control

作　　者：孙东阳[1] 申文强 孟繁易 沙昱彤 王南 胡博[3] SUN Dong-yang;SHEN Wen-qiang;MENG Fan-yi;SHA Yu-tong;WANG Nan;HU Bo(School of Electrical and Electronic Engineering,Harbin University of Science and Technology,Harbin 150080,China;School of Electrical Engineering and Automation,Harbin Institute of Technology,Harbin 150001,China;State Grid Liaoning Electric Power Co.,Ltd.,Shenyang 112000,China)

机构地区：[1]哈尔滨理工大学电气与电子工程学院,黑龙江哈尔滨150080 [2]哈尔滨工业大学电气工程及其自动化学院,黑龙江哈尔滨150001 [3]国家电网辽宁省电力有限公司,辽宁沈阳112000

出　　处：《电机与控制学报》2022年第12期63-73,共11页Electric Machines and Control

基　　金：黑龙江省新能源电机系统及关键材料研究头雁团队项目。

摘　　要：电网次同步振荡(SSO)影响双馈感应发电机(DFIG)中网侧变流器(GSC)的正常工作,致使其控制目标直流母线电压产生脉动,导致风电并网系统出现次同步振荡,为此提出一种基于自适应准谐振控制器的DFIG-GSC次同步振荡抑制策略。首先,建立电网SSO状态下的GSC数学模型,通过推导得到电网发生SSO时直流母线电压振荡频率的函数关系式,并进行相应的仿真验证;其次,基于内模原理设计与自适应算法,设计自适应准谐振控制器来抑制DFIG并网系统的次同步振荡;同时,基于Lyapunov稳定性定理设计反步控制器,进一步提高GSC系统的鲁棒性。采用改进控制器取代原有的PI控制器,进而达到抑制电网SSO对直流母线电压影响的目的;最后,搭建DFIG并网系统的实验平台,分别在10、20 Hz以及变频率的电网SSO状态下验证所提抑制策略的有效性。A DFIG-GSC sub-synchronous oscillation(SSO) suppression strategy based on an adaptive quasi-resonant controller is proposed to address the problem that grid SSO affects the normal operation of the grid-side converter(GSC) in doubly-fed induction generator(DFIG), resulting in pulsation of the control target DC bus voltage, which leads to sub-synchronous oscillation in grid-connected wind power systems. Firstly, the mathematical model of GSC in the SSO state of the grid was established, and the functional equation of the DC bus voltage oscillation frequency when SSO occured in the grid was obtained by derivation, and the corresponding simulation was verified. Secondly, an adaptive quasi-resonant controller was designed to suppress the sub-synchronous oscillations of DFIG grid-connected system based on the internal mode principle design and adaptive algorithm. Meanwhile, a backstepping controller was designed based on Lyapunov stability theorem to further improve the robustness of the GSC system. The improved controller was used to replace the original PI controller, thus achieving the problem of suppressing the influence of grid SSO on the DC bus voltage. Finally, an experimental platform of DFIG grid-connected system was built to verify the effectiveness of the proposed suppression strategy under the grid SSO conditions of 10, 20 Hz and variable frequency, respectively.

关 键 词：风力发电 双馈感应发电机 次同步振荡 网侧变流器 自适应准谐振控制器 反步控制器 

分 类 号：TM346[电气工程—电机]