基于直驱永磁风电系统的改进自适应滑模控制虚拟同步发电机策略  

Strategy of An Improved Adaptive Sliding Mode Controlling Virtual Synchronous Generator Control Based on Direct-Driven Permanent Magnet Wind Power System

作　　者：谌安平 胡霄林 罗朝旭 程谆 CHEN Anping;HU Xiaolin;LUO Zhaoxu;CHENG Zhun(College of Electrical and Information Engineering,Hunan University of Technology,Zhuzhou 412007,China;Software College,Henan University,Kaifeng 475004,China;Hunan Railway Professional Technology College,Zhuzhou 412001,China)

机构地区：[1]湖南工业大学电气与信息工程学院,湖南株洲412007 [2]河南大学软件学院,河南开封475004 [3]湖南铁道职业技术学院,湖南株洲412001

出　　处：《湖南电力》2023年第4期63-73,共11页Hunan Electric Power

基　　金：国家自然科学基金项目(52207205);湖南省自然科学基金项目(2022JJ50094)。

摘　　要：针对直驱永磁风力发电系统中,由逆变器间的等效输出阻抗和输电线路阻抗的差异导致传统虚拟同步发电机(virtual synchronous generator,VSG)控制的多逆变器并联功率不均分和环流抑制效果较差的问题,提出一种改进自适应滑模控制的多台VSG功率均分及环流抑制控制策略。根据总负荷容量和各逆变器容量计算给定功率,并根据给定无功功率实时调整虚拟阻抗值,补偿因线路阻抗差异引起的电压降落差,在αβ坐标系下分别对2台VSG展开滑模控制设计。基于逆变器输出电压与VSG参考电压之差设计滑模面,且基于李雅普诺夫(Lyapunov)稳定性理论设计由等效控制、切换控制和自适应补偿项构成的自适应滑模控制器。与传统方法相比,所提控制策略实现了功率均分且具有环流抑制能力,并提高了无功功率和VSG输出电压的分配精度。最后,在MATLAB/Simulink中验证了该控制策略的正确性和有效性。For the direct-drive permanent magnet synchronous wind generator system,because of the difference of equivalent output impedance between inverters and transmission line impedance,the problems of multi-inverters controlled by traditional virtual synchronous generator(VSG),such as unequal power distribution and poor circulating current suppression are presented,and an improved adaptive sliding mode control strategy is proposed for multiple VSG power sharing and circulation suppression.The given power calculating is calculated according to the total load capacity and the capacity of each inverter,and the virtual impedance according to the given reactive power to compensate the voltage drop caused by the difference of line impedance is adjusted.The sliding mode control of two VSG is designed in coordinate system,and the sliding mode surface is designed based on the difference between the inverter output voltage and the VSG reference voltage,based on Lyapunov stability theory,an adaptive sliding mode controller is designed,which consists of equivalent control,switching control and adaptive compensation.Compared with the traditional control method,the proposed control strategy power sharing and circulation suppression are achieved,and the distribution accuracy of reactive power and VSG output voltage are improved.Finally,the correctness and validity of the control strategy are verified in MATLAB/Simulink.

关 键 词：直驱永磁同步风力发电系统 自适应滑模控制 功率均分 环流抑制 虚拟同步发电机 

分 类 号：TM464[电气工程—电器]