直驱式混合励磁风力发电系统控制策略的研究

Control strategy study on direct-driven type hybrid excitation wind power system

介绍了一种新型的基于混合励磁同步发电机的直驱式风力发电系统,提出了一种基于矢量控制的新型控制策略及其实现方法。建立了混合励磁同步发电机和风机的数学模型,通过控制混合励磁同步发电机的励磁电流来稳定三相并网逆变器的直流母线电压,通过控制混合励磁同步发电机的转速来实现最大风能跟踪。网侧变换器采用电网电压定向的矢量控制,实现了dq轴电流解耦控制。采用Matlab/Simulink工具箱,建立了该系统的仿真模型,在不同条件下进行了仿真。仿真结果表明,在风速变化时,通过调节励磁电流,在保持直流母线电压不变的同时,系统可有效地实现最大风能跟踪和逆变并网,从而验证了该控制方法不仅算法简单有效,而且便于实现。

A novel direct-driven type wind power generation system based on hybrid excitation generator is introduced in this paper.A new control strategy based on vector control and achieving methods are proposed.First of all.the mathematical models of the hybrid excitation synchronous generator and wind turbine are established.Then the DC bus voltage of three-phase grid-connected inverter is stabilized by controlling the excitation current of hybrid excitation generators and the maximum wind speed tracking is achieved by controlling the speed of hybrid excitation generators.The grid-connected inverter is controlled using grid voltage-oriented vector to realize the decoupling control of dq axis current.Finally.the system simulation model is established using Matlab/Simulink.Simulation results show this system can achieve peak wind power point tracking by regulating the excitation current when wind speed changes and can keep DC bus voltage in constant.It is not only simple but also easy to implement by using this control strategy.