双星形联结发电机供电的24脉波变流器及其控制

24-pulse Converter Fed by Double Y Motor-generator and Its Control

稳定的等离子体放电是开展高质量物理实验的主要基础,在等离子体垂直位移发生偏移时,需对其进行反馈控制以修正偏移量。为了对等离子体垂直位移进行有源反馈控制,文章设计了一种24脉波变流器,其需要满足特殊的供电条件,即双星形联结发电机供电。优化设计的24脉波变流器,其通过正、负两组变流器协同工作,实现大电流下的四象限运行;通过变压器和变流器的有序组合,使得发电机两个星级供电的负荷均衡;采用逻辑带环流的控制方式,使得电流过零连续平滑;并充分利用双星形联结发电机阻抗较大的特点来抑制环流,且省去平衡电抗器,降低了电源成本。仿真结果表明,这种24脉波变流器在双星形联结发电机供电的特殊供电条件下,能够满足等离子体垂直不稳定控制的基本要求。

Stable discharge of plasma is the main foundation for high quality physics experiment.When the vertical displacement of plasma is offset,feedback control is required to correct the offset.For the sake of controlling the vertical displacement of plasma by active feedback,a 24-pulse converter is proposed,which has to conform to the special power condition,i.e.,the double Y motor-generator.The optimized 24-pulse converter has 2-group converters,positive group and negative group,working together so as to realize 4-quadrant operation under large current.The loads of the double Y motor-generator are balanced by the way of the combination between the transformers and the converters.The control with logical circulating current is used,so that the output current is continuous and smooth in the zero-crossing point.Benefit from the large impedance of motor-generator,balanced reactor could be omitted which could make cost reduction.It is enable for the 24-pulse converter to meet the basic requirements of plasma vertical instability control under the unique double Y motor-generator power condition.