摘要
根据风力机的输出特性,阐明最佳特性曲线法实现风力发电系统最大功率追踪的原理,选取背靠背电压型双PWM变换器为研究对象,在参考坐标变换理论基础上,分析并搭建了永磁同步电机和PWM变换器的数学模型,为仿真分析提供依据。依据变换器控制的数学模型,对网侧变换器和机侧变换器的控制策略进行了研究。网侧变换器采取前馈解耦方案,实现VSR的有功、无功功率解耦控制,获得基于电网电压定向的双闭环控制策略;机侧变换器采用零D轴电流控制策略,基于转子磁场定向的矢量控制方法,通过矢量控制方法实现对定子电流的控制,达到良好的转矩控制性能;基于MATLAB软件对设计的系统进行理论仿真验证,仿真结果证明矢量控制策略具有良好的稳态和动态性能。
The principle of MPPT control of the WEGS using optical characteristic curve is explained according to wind turbine output characteristics. The back-back voltage source dual-PWM converter is selected for the study. The mathematical models of permanent magnet synchronous generator and PWM converter have been analyzed and built after referring to the coordinate transformation theory. This has provided a basis for the simulation analysis. It is a study on the control strategies of grid side converter and machine side converter based on the mathematical model of converter control. Feed-forward decoupling scheme is adopted to achieve the active and reactive power decoupling control on grid side converter. This paper obtains a voltage and current double closed-loop controlling method based on grid voltage orientation. To achieve good torque control performance, the zero d-axis current control strategy is used for the machine side converter. The stator current control strategy is obtained based on the rotor flux orientation vector control method and vector control method. This can provide a reference for the selection of parameters. The simulation for the designed system is carried out using Matlab software. Simulation results verify that the method of vector control has good stability and dynamic performance.
出处
《新型工业化》
2015年第6期19-26,共8页
The Journal of New Industrialization
基金
国家自然科学基金(51177040)
