サイクロコンバータの駆動法の研究 III

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The authors have reported utilizing a digital controller for driving three phase circulating current cycloconverter by means of microcomputers. This controller consists of four central process units and other devices. One central processor is used for calculating and the other three are used for controlling. With this controller, cycloconverter can generate variable voltages and variable frequencies. As compared with the conventional controller, this one has many advantages. At this time the authors have developed a six phase circulating current-free cycloconverter controller which requires fewer controlling devices than previous controller and modified software. A six phase cycloconverter is much better than three phase from the viewpoint of harmonics. Poly phase is ideal for reducing the harmonics. With less harmonics, quasi-sinusoidal wave can be obtained and three phase induction motor does not generate vibrating torque. As compared with previous controller, this one requires twice the number of gate pulse amplifiers and other additional devices such as load current polarity discriminators, logic circuits and group selectors. To drive a circulating current-free cycloconverter, positive and negative group must operate by turns in accordance with the porality of load current. So group selectors are indispensable. The authors propose an excellent logic circuit to clearly select positive and negative group, because current polarity discriminators do not operate well in overlap domain of positive and negative group. In software, six phase controller is more difficult to control than three phase in the controlling period of time. Firing angle calculater of three phase can be used in six phase. But the number of counters is twice as many as with three phase and the distance of the counters is half of three phase. Firing pulse patterns of six phase are different from those of three phase, so the software for controlling it must be partially changed. In this paper, six phase circulating currentfree cycloconverter controller is introduced from the viewpoint of hardware and softrware
大同工業大学の論文

サイクロコンバータの駆動法の研究 III

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