Simultaneous feedback control of toroidal magnetic field and plasma current on MST using advanced programmable power supplies

IF 1.3 Q3 ORTHOPEDICS
I R Goumiri, K. McCollam, A. Squitieri, D J Holly, J. Sarff, S P Leblanc
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引用次数: 2

Abstract

Programmable control of the inductive electric field enables advanced operations of reversed-field pinch (RFP) plasmas in the Madison Symmetric Torus (MST) device and further develops the technical basis for ohmically heated fusion RFP plasmas. MST’s poloidal and toroidal magnetic fields (B p and B t) can be sourced by programmable power supplies (PPSs) based on integrated-gate bipolar transistors (IGBT). In order to provide real-time simultaneous control of both B p and B t circuits, a time-independent integrated model is developed. The actuators considered for the control are the B p and B t primary currents produced by the PPSs. The control system goal will be tracking two particular demand quantities that can be measured at the plasma surface (r = a): the plasma current, I p ∼ B p(a), and the RFP reversal parameter, F ∼ B t(a)/Φ, where Φ is the toroidal flux in the plasma. The edge safety factor, q(a) ∝ B t (a), tends to track F but not identically. To understand the responses of I p and F to the actuators and to enable systematic design of control algorithms, dedicated experiments are run in which the actuators are modulated, and a linearized dynamic data-driven model is generated using a system identification method. We perform a series of initial real-time experiments to test the designed feedback controllers and validate the derived model predictions. The feedback controllers show systematic improvements over simpler feedforward controllers.
利用先进的可编程电源实现MST上环形磁场和等离子体电流的同时反馈控制
感应电场的可编程控制实现了麦迪逊对称圆环(MST)装置中反向场箍缩(RFP)等离子体的高级操作,并进一步发展了欧姆加热聚变RFP等离子体的技术基础。MST的极向和环形磁场(Bp和Bt)可以由基于集成栅双极晶体管(IGBT)的可编程电源(PPS)提供。为了提供对Bp和Bt电路的实时同时控制,开发了一个与时间无关的集成模型。考虑用于控制的致动器是PPS产生的Bp和Bt初级电流。控制系统的目标是跟踪可以在等离子体表面测量的两个特定需求量(r=a):等离子体电流I p~B p(a)和RFP反转参数F~B t(a)/Φ,其中Φ是等离子体中的环形通量。边缘安全系数q(a)ŞB t(a)倾向于跟踪F,但不完全相同。为了理解I p和F对致动器的响应,并实现控制算法的系统设计,进行了专门的实验,其中对致动器进行了调制,并使用系统识别方法生成了线性化的动态数据驱动模型。我们进行了一系列初始实时实验,以测试设计的反馈控制器,并验证导出的模型预测。反馈控制器比简单的前馈控制器有系统的改进。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
Plasma Research Express
Plasma Research Express Energy-Nuclear Energy and Engineering
CiteScore
2.60
自引率
0.00%
发文量
15
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