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首页> 外文期刊>Nuclear fusion >A two-time-scale dynamic-model approach for magnetic and kinetic profile control in advanced tokamak scenarios on JET
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A two-time-scale dynamic-model approach for magnetic and kinetic profile control in advanced tokamak scenarios on JET

机译：在JET上高级托卡马克方案中用于磁和动力学轮廓控制的两尺度动态模型方法

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摘要

Real-time simultaneous control of several radially distributed magnetic and kinetic plasma parameters is being investigated on JET, in view of developing integrated control of advanced tokamak scenarios. This paper describes the new model-based profile controller which has been implemented during the 2006-2007 experimental campaigns. The controller aims to use the combination of heating and current drive (H&CD) systems-and optionally the poloidal field (PF) system-in an optimal way to regulate the evolution of plasma parameter profiles such as the safety factor, q(x), and gyro-normalized temperature gradient, ρ_(Te)~*(x). In the first part of the paper, a technique for the experimental identification of a minimal dynamic plasma model is described, taking into account the physical structure and couplings of the transport equations, but making no quantitative assumptions on the transport coefficients or on their dependences. To cope with the high dimensionality of the state space and the large ratio between the time scales involved, the model identification procedure and the controller design both make use of the theory of singularly perturbed systems by means of a two-time-scale approximation. The second part of the paper provides the theoretical basis for the controller design. The profile controller is articulated around two composite feedback loops operating on the magnetic and kinetic time scales, respectively, and supplemented by a feedforward compensation of density variations.
机译：考虑到发展先进的托卡马克情景的综合控制，正在JET上研究几个径向分布的磁和动力学等离子体参数的实时同时控制。本文介绍了新的基于模型的配置文件控制器，该控制器已在2006-2007年的实验活动中实施。该控制器旨在以最佳方式结合使用加热和电流驱动（H＆CD）系统以及可选的极向电场（PF）系统，以调节等离子体参数曲线（例如安全系数q（x），陀螺归一化温度梯度ρ_（Te）〜*（x）。在本文的第一部分中，描述了一种用于最小识别动态等离子体模型的实验识别技术，该技术考虑了输运方程的物理结构和耦合，但未对输运系数或它们的依赖性进行定量假设。为了应对状态空间的高维性和所涉及的时间尺度之间的较大比例，模型识别过程和控制器设计都利用奇异摄动系统的理论，通过两次时间尺度逼近。本文的第二部分为控制器设计提供了理论基础。轮廓控制器围绕两个分别在磁和动时标上运行的复合反馈回路进行铰接，并通过密度变化的前馈补偿进行补充。

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