Control method for three-phase current source type converter capable of lowering switch loss

The invention discloses a control method for a three-phase current source type converter capable of lowering switch loss. The control method comprises the steps of judging each sector region, selecting each resultant vector, defining a switching state corresponding to each vector, distributing the vector acting time and the like. The control method has the beneficial effects as follows: the numberof on-ff times in the system operation process can be reduced effectively, under the premise of not changing a hardware circuit and lowering switching frequency, thereby lowering switching loss; andmeanwhile, a current overlaying time is not needed to be set in the switch switching process, so that influence of the current overlaying time to the system waveform quality can be avoided. 本发明公开了种三相电流源型变换器减小开关损耗的控制方法，其内容包括判断扇区，选择合成矢量，定义矢量对应的开关状态，分配矢量作用时间等步骤。本发明的有益效果是：在不改变硬件电路和降低开关频率的前提下，有效的减小了系统运行过程中的开关次数，从而减小了开关损耗。同时，也使得在开关切换过程中不必设置叠流时间，避免了叠流时间对系统波形质量的影响。