双馈风电模拟系统空载并网控制与试验研究

Research on Control and Test of No-load Grid-connection of the Doubly-fed Wind Power Simulation System

在双馈型风力发电系统并网过程中,为避免发电机在并网时对电网产生电流冲击,使其能够安全平稳地接入电网,基于定子磁链矢量定向控制原理,分析了双馈异步发电机(DFIG)的数学模型以及其空载并网模型。介绍了一种柔性空载并网控制策略。利用MATLAB仿真软件建立了双馈异步风力发电机并网控制仿真模型,同时基于自主研制的以TMS320F2812为核心的背靠背硬件电路,搭建了一个3 kW的双馈风电模拟系统试验平台,对双馈电机空载并网过程进行仿真和试验研究。最终仿真和试验结果都表明,控制策略能够有效地减少并网过程产生的冲击,实现双馈电机的自并网。同时验证了试验平台的可扩展性和稳定性。

In the process of grid connection of the doubly-fed power generation system,to prevent the generator from making current shock on the grid during grid connection to ensure safe and steady grid connection,based on the principle of stator flux linkage vector orientation control,this paper analyzed a mathematical model of the doubly-fed induction generator（DFIG） as well as its no-load grid connection model. It introduced a flexible no-load grid connection control strategy. A grid connection control simulation model was established for DFIG through MATLAB,and a 3 kW doubly-fed wind power simulation system test platform was built up,based on an independently developed back-to-back hardware circuit using TMS320 F2812 as core for the purpose of simulation and test research on the no-load grid-connection process of the doubly-fed motor. Finally,the simulation and test results indicated that the proposed control strategy could effectively reduce the shock produced during grid connection to realize DFIG self-grid connection.The scalability and stability of the test platform was also verified.