双变量交-交变频器双馈调速平滑性的研究

Study of Bi-feed Speed Control Smoothness by Bi-variate AC-AC Converter

针对目前被广泛应用的交-交变频器存在的缺点,提出了一种自然无环流双变量交-交变频器的控制方法,并把变频器的频率输出范围扩大到非整数分频,使输出频率的上限达到输入频率的1/2以上,调速级差达到很小,实现了无环流、无死区、无检测、无反馈、全开环、调速级差小调速范围宽的交-交变频器,其调速系统成本更低,可以实现能量的双向流动,容易实现四象限运行。通过实验,验证了所提出理论的正确性。

Proposes a control method without circulation, which aims at the shortcomings of existent widespread bivariate AC-AC converter. By this method output frequency scope expands to non-integer frequency-division, the upper limit of output frequency exceeds 1/2 of input frequency, the difference between speed control-grades achieves very small. Thus the AC-AC converter may operate without circulation, no dead-time, no examination, non-feedback, with entire open circuit, wide scope and small grade-difference of speed control. The control system costs lower, realizes bidirectional flow of energy, easy to bring into four quadrants operation. Finally the correctness of proposed theory is confirmed by the experiment of inverter.