摘要
直驱永磁同步风力发电机通过背靠背变流器与电网连接,这会导致电力系统频率与发电机功率解耦,从而带来在系统频率变化时不具备惯性响应的问题。针对这一问题,文章将虚拟同步发电机(VSG)控制策略引入到逆变器的控制当中,利用虚拟惯量支撑系统频率的变化。同时,该方法结合了发电机与变流器,其中发电机侧变流器采用转子磁链定向的矢量控制来保持直流母线电压的恒定,而直流母线电压大小的变化会反映系统频率的变化,进而将电机出力情况和系统频率变化联系起来。最后,在MATLAB/Simulink中对同步发电机搭建相关仿真模型,并且仿真结果验证了这种控制策略对于系统频率调节的有效性。
Direct-drive permanent magnet synchronous wind turbines are connected to the grid through back-to-back converters,which will cause the power system frequency to be decoupled from the generator power,resulting in a problem that the inverters does not have an inertia response when the system frequency changes.Aiming at this problem,this paper introduces the virtual synchronous generator(VSG)control strategy into the control of the inverter,and takes advantage of the virtual inertia to support the change of the system frequency.Simultaneously,this method combines VSG with the generator and the converters,in which process the vector control strategy of the rotor flux linkage is utilized in generator-side converter to keep the DC bus voltage constant,the change of which reflects the change in system frequency.And then,the generator output is linked to the system frequency changes.Finally,a simulation model of synchronous generators is built in MATLAB/Simulink,and the simulation results verify the effectiveness of this control strategy for system frequency adjustment.
作者
程之隆
李岚
吴雷
郭潇潇
Cheng Zhilong;Li Lan;Wu Lei;Guo Xiaoxiao(Taiyuan University of Technology,Taiyuan 030024,China)
出处
《电测与仪表》
北大核心
2020年第18期103-109,共7页
Electrical Measurement & Instrumentation
基金
山西省自然科学基金资助项目(201701D121130)。
关键词
直驱永磁同步风力发电机
虚拟同步发电机
逆变器
虚拟惯量
频率调节
direct-drive permanent magnet synchronous wind turbine
virtual synchronous generator
inverter
virtual inertia
frequency adjustment
