【摘要】 介绍了大功率直驱型风力发电系统的结构,系统采用多重化AC/DC/AC变换器,以减小每只IGBT的电流和流入电网的谐波电流。提出了一种适用于大功率风力发电变换器的实验方法。该方法可以控制变换器内部流过一个很大的环流,但仅有变换器损耗造成的电流流入电网。该方法能大大节省实验所需要的电能,并且可以在小容量电网下进行大功率变换器实验。该方法能很好地测试变换器的主电路、驱动电路、保护电路和控制电路。介绍了环流实验方案的建模和控制,同时比较了正弦脉宽调制(SPWM)与空间矢量调制(SVPWM)在该方案中的不同之处。仿真和实验均表明,该方法能够简单有效地测试大功率风力发电变换器。更多还原

【Abstract】 A direct drive wind energy conversion system is developed.In order to reduce the current of each IGBT and the harmonic current to the grid,a multiple AC/DC/AC converter which is suitable for high power wind energy conversion systems is used.An efficient experimental method for high power converter is presented.A large circulating current flows in the converter,but only a small part of the current caused by the losses of the converter flows into the grid.The method can save a lot of energy when the converter is tested and the experiment can be done in the micro grid.The method can test the main stage,drive circuit,protect circuit and some parts of control circuit.Modeling and control scheme for circulating current experiment are introduced,as well as the control scheme of the grid side converter.Some differences caused by sinusoidal pulse width modulation(SPWM) and space vector pulse width modulation(SVPWM) in the method are analyzed.Simulative and experimental results verify the analysis and the conclusion.更多还原