Fuzzy Logic Control of Toroidal Plasmas

点击翻译按钮获取中文摘要

This research aims at applying fuzzy logic to the plasma control, at clarifying the applicability of this algorism, and at searching for the prospect of the future fusion reactor control.The control objets in magnetically confined toroidal plasmas are plasma current, plasma position, plasma cross-section, plasma density, heating power and so on. In addition to those, in the reactor, neutron production rate and fusion power output should be controlled. Until now classical PID (Proportional, Integrated and Derivative) control schemes are adopted in the fusion research. Since the machine system becomes bigger, a new flexible and reliable control concept is being required.The author are continuing the plasma control research in both tokamak and helical systems, and developing computer codes for plasma modeling. As for fuzzy control research, a mini-max center-of-gravity fuzzification method with triangular membership function is applied to the plasma current control in helical plasma.During this fiscal year (Heisei 6th) a fuzzy control algorism was added to the LHD plasma control R&D machine. This control scheme will be applied to the fusion experimental machine and fusion power reactor, and will contribute to the systematization of fusion control. At the beginning of this research, only fuzzy control logic was surveyed, but wide and basic investigations on various intelligent controls have recently been started, including neural network combined with fuzzy logic and new concepts (Chaos Engineering and Generic Algorism).