北京生物医学工程

基于自抗扰控制器的射频消融电极温度控制系统仿真研究

Simulation study on temperature control system of radiofrequency ablation electrode based on ADRC

作者：程妍妍田甄张之帅宋晓华南群

单位：北京工业大学环境与生命学部（北京 100124）<br />通信作者：南群，教授。E-mail: nanqun@ bjut. edu. cn

分类号：R318.04

出版年·卷·期（页码）：2023·42·1（61-66）

摘要：

目的将自抗扰控制器（active disturbance rejection controller，ADRC）应用于射频电极并探讨温度控制效果。方法在MATLAB Simulink仿真平台，建立基于ADRC的射频电极温度控制系统，进行阶跃信号实验。加入幅值为2的阶跃信号扰动，以模拟不稳定的人体内环境。此外，将温度滞后时间τ、温度转换时间T和增益系数K值增加20%和50%，与同条件比例-积分-微分（proportion integration differentiation，PID）控制性能对比。结果（1）ADRC调节时间（15.38 s）较PID（18.68 s）短且超调为0。（2）τ与T值变化时，PID超调最大增量分别为3.55%和8.55%，但ADRC超调均为0；K 值变化时，ADRC虽出现超调，但同参数下的超调均较PID小。（3）各种参数变化下，两者受干扰后均能在30s内平稳快速达到设定值。结论 ADRC控制技术在射频电极温度控制中显示超调小、稳定速度快、抗干扰性及参数变化适应性，具有良好的调节能力。

Objective To apply the active disturbance rejection controller (ADRC) ，and to explore its control effect.Methods The radiofrequency temperature control system based on ADRC was established on the MATLAB Simulink simulation platform, and the step signal test was carried out. A step signal disturbance with amplitude of 2 was added to simulate the unstable human body environment. In addition, the temperature lag time τ，temperature conversion time T and gain coefficient K increased by 20% and 50%. The results were compared with the PID control performance under the same conditions.Results (1) The adjusting time of ADRC (15.38s) was shorter than PID (18.68s), and the overshoot was 0. (2) When the τ and T value changed，the maximum overshoot of PID was 3.55% and 8.55% respectively, but the overshoot of ADRC was 0. When the K value changed, ADRC overshoot occured, but the overshoot was smaller than PID under the same parameter. (3) Under various parameter changed, both ADRC and PID could reach the set value smoothly and quickly within 30s after being disturbed.Conclusions ADRC control technology shows small overshoot, fast stability, anti-interference and parameter change adaptability in RF electrode temperature control, and has good adjustment ability.

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