【摘要】 针对三电平静止无功发生器(static var generator,SVG)提出了一种滞环空间矢量脉宽调制(space vector pulse width modulation,SVPWM)电流控制方法。该方法以相间电流为控制目标,得到了新的解耦方式。在相应的相间指令电压区域,根据直流侧中点电压与相电流的关系,先固定其中一相开关状态,再对其他两相开关状态进行独立控制,从而控制住两个相应的相间电流误差,最终使第三个相间电流误差也得到控制。该方法降低了系统的开关频率,减少了开关损耗,实现了直流侧中点电压控制,并且具有电流响应速度快的优点。实验证明了其具有良好的动、静态特性。更多还原

【Abstract】 According to the topology of neutral-point clamped(NPC) three-level static var generator(SVG), this paper presented a new control way about hysteresis currents with space vector pulse width modulation(SVPWM). In this method, the interphase current was taken as the control target, and a new decoupling method was obtained. In the corresponding phase command voltage region, one phase switch state was fixed first, according to the relationship between the DC side midpoint voltage and phase current. Then the other two phase switching states were controlled independently so as to control two corresponding phase current errors, and the third phase current error was also controlled. This method implemented the requirement of midpoint voltage control, high response speed and low switching losses. Experiments proved that the way has a good dynamic and static characteristics.更多还原