变速恒频双馈风力发电机组交流励磁控制系统研究

Study on AC-excited Control System of VSCF Doubly-fed Wind Power Generation System

介绍了变速恒频双馈风力发电系统的工作原理,分析了双馈型风机的运行性能,重点对采用双PWM换流器结构的交流励磁系统进行了介绍,提出了一种矢量控制策略,对网侧和转子侧变换器采用不同的矢量控制,从而实现不同的控制目标。并通过EMTDC/PSCAD软件进行了建模仿真,仿真表明,采用介绍的控制策略,能实现风力发电系统的最大风能追踪及有功无功解耦控制,保证输出功率稳定,实现高功率因数并网运行。

The operation principle of doubly-fed VSCF wind power generation system was analyzed, it especially introduced the doubly-fed generator＇s AC-excited system based on a structure of dual PWM converter, presented a vector control strategy, which adopted different vector control between the grid-side converter and the rotor side converter, in order to achieve various control goals. The simulation on EMTDC/PSCAD software shows that adopting this control strategy this article presented, it is able to track the largest wind energy, achieves the decoupling control of wind power system＇s active and reactive power, ensures the stability of output power and operate on high power factor.