摘要
针对电网波动中风力发电励磁系统出现的过电压、过电流问题,以一台6极3.5kW绕线式感应发电机为例,采用有限元方法计算电机的参数,建立了基于matlab并网运行的双馈感应发电机的仿真模型;并在传统的矢量控制基础上,将电网电压及定子磁场电流的动态变化引入系统,采用外环功率控制及内环电流控制的双闭环调节方式,建立了考虑电网波动下定子磁链定向的矢量控制系统模型并进行了仿真,仿真结果表明系统具有良好的动态响应能力,能够很好地实现在风力机最佳功率曲线上运行的可能性,满足变速恒频及有功功率和无功功率的解耦控制;通过与不考虑电网波动的情况进行对比,得出系统具有很好的抑制过电流能力的结论,为励磁系统的设计提供了一定的理论基础。
In light of the over-voltage and over-current in wind power generation excitation system, using a 3. 5kW 6-pole wound induction generator as example, double fed induction generator model is established based on calculated the parameters of electrical machines by Finite Element Analysis. On the base of the traditional vector control, the dynamic change in network voltage and state flux current is imported into the system; the two closed loop modulation in outer-loop power control and inner-loop current control is adopted; the model of vector control system is established at the state flux linkage orientation considering the network fluctuation and simulation. Simulation results improve that the system had more favorable dynamic performance and is capable of feasibility to imitate the maximum output power curve, satisfied varied speed constant frequency and decoupiing the active and reactive powers. Comparing with the system which does not take fluctuation into account, this is a good system of over-current constraints, providing the certain theoretical basis for designing exciter system.
出处
《现代电力》
2006年第4期29-34,共6页
Modern Electric Power
基金
黑龙江省教育厅资助计划1055HQ030
关键词
风力发电
电网波动
变速恒频
矢量控制
有限元
wind power generation
grid fluctuation
variable-speed constant-frequency
vector control
finite element method
