基于反步自适应准谐振控制的双馈风机次同步振荡抑制策略  

DFIG Sub-Synchronous Oscillation Suppression Strategy Based on Backstepping Adaptive Quasi-Resonant Control

作　　者：孙东阳[1] 孟繁易 王南 金宁治[1] 蔡蔚 Sun Dongyang;Meng Fanyi;Wang Nan;Jin Ningzhi;Cai Wei(College of Electrical and Electronic Engineering Harbin University of Science and Technology,Harbin,150080,China;College of Electrical Engineering and Automation Harbin Institute of Technology,Harbin,150001,China)

机构地区：[1]哈尔滨理工大学电气与电子工程学院,哈尔滨150080 [2]哈尔滨工业大学电气工程及自动化学院,哈尔滨150001

出　　处：《电工技术学报》2023年第9期2375-2390,2434,共17页Transactions of China Electrotechnical Society

基　　金：黑龙江省新能源电机系统及关键材料研究头雁团队资助项目。

摘　　要：随着电力系统容量和规模的不断扩大,常采取串补电容的方式提升输电线路的输电能力,但这加剧了电力系统中出现次同步振荡(SSO)的风险。SSO的产生会影响双馈感应发电机(DFIG)转子侧变流器(RSC)的控制,进而引起定子电流的振荡发散,严重时将会导致风机解列脱网。因此,为解决SSO对RSC控制产生扰动的问题,该文提出了基于自适应准谐振控制的RSC反步次同步振荡抑制策略。首先对SSO在RSC控制系统中的传播路径及其频率变化对控制的影响等内容展开研究;然后通过反步控制器与自适应准谐振控制器的协同控制,对DFIG定子中宽频带SSO电流进行抑制,避免发电系统输出受到SSO的影响;最后通过搭建仿真模型与实验平台,验证所提理论与控制策略的有效性。该文分别对在10 Hz、20 Hz、30 Hz及频率变化时SSO影响下的DFIG定子振荡电流抑制效果进行验证。实验结果表明,所提策略对DFIG系统中宽频带SSO具有良好的抑制效果。With the continuous expansion of the capacity and scale of power system,the series compensation capacitor is often adopted to improve the transmission capacity of the line,but this aggravates the risk of sub-synchronous oscillation in the system.The power grid sub-synchronous oscillation will affect the control of the rotor side converter(RSC)of doubly fed induction generator(DFIG),and then cause the oscillation divergence of stator current,and in severe cases,the wind turbine will be disconnected from the grid.To solve the problem that the sub-synchronous oscillation of the power grid interferes with the control of the RSC of the DFIG,which leads to the distortion of DFIG stator current,this paper adopts the RSC backstepping sub-synchronous oscillation suppression strategy based on adaptive quasi-resonant control to maintain the stable output of DFIG stator current.The propagation mechanism of power grid sub-synchronous oscillation in RSC is firstly studied,and the propagation path of oscillation signal in RSC control system is determined by establishing the RSC mathematical model under the power grid sub-synchronous oscillation,and the calculation formula of sub-synchronous component of DFIG stator current is obtained.Secondly,the corresponding backstepping controller is designed based on the RSC decoupling model and the Lyapunov stability function to simplify the RSC control system and reduce the power grid sub-synchronous oscillation transmission path.At the same time,considering the failure of the oscillation suppression strategy when the power grid sub-synchronous oscillation frequency changes,this paper proposes to use an adaptive quasi-resonant controller to track and control the sub-synchronous components of different frequencies in the DFIG stator current.The backstepping controller and the adaptive quasi-resonant controller control the fundamental and sub-synchronous components of the DFIG stator current respectively,so as to suppress the sub-synchronous current at different frequencies in the DFIG sta

关 键 词：双馈感应发电机 次同步振荡频率变化 转子侧变流器 反步控制器 自适应准谐振控制器 

分 类 号：TM346[电气工程—电机] TM732