摘要
直驱永磁风力发电系统中,变流器是将发电机所发的电能输送至电网的设备。建立了永磁直驱风力发电系统并网变流器数学模型,在同步旋转坐标系下,将输入功率因数改善到单位功因。同时,在三相全桥全控型直流-交流变流器电网并网下,提出了交-直轴电流闭回路控制,使永磁式同步发电机向电网提供电能。利用MATLAB/Simu-link建模仿真,仿真表明设计的交-直轴电流闭回路控制,发电机能向电网稳定输送功率,其并网电流和电网电压同相位,并实现单位功率因数传递电能,验证了控制系统的可行性与有效性。
In direct-driven wind generation system, converter is the only path for the power of the generator feeding to the power. A two-phase rotating coordinate system （d-q） of the mathematical model is established. The three-phase grid connection in proposed system uses three-phase full bridge full-controlled inverter and current control to supply real power. It is important for stable and efficient operation of the system, current closed loop control technology is promoted, this technology will improve power factor. Makes use of Matlab/Simulink to construct systematic model based on the theory study. Through simulation, the systematic structure that this thesis designs has the characters of favorable control effect under the stable and unstable condition. The results indicate that the control strategy is feasible and effective.
出处
《沈阳理工大学学报》
CAS
2012年第2期12-15,共4页
Journal of Shenyang Ligong University
基金
沈阳工程学院科技项目(L2011385)
关键词
并网变流器
功率因数
电流闭回路控制
network converter
power factor
current closed loop control
