Research on resonant magnetic perturbation coil power supply based on active disturbance rejection control
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摘要: 针对托卡马克装置中共振磁扰动线圈电源采用传统PI控制器存在响应速度与超调之间的矛盾以及在复杂电磁环境下工作抗干扰能力差的问题，采用线性自抗扰控制策略，安排过渡过程提取参考信号的微分品质，从而实现快速无超调的电流输出。并基于电源系统部分已知数学模型参数，设计了四阶线性扩张状态观测器，估计系统干扰量作为系统新的状态量进行补偿，从而抑制了电源系统内部不确定因素和外部扰动。最后仿真结果表明：相较于采用传统PI控制策略，自抗扰控制策略能够有效提高输出电流信号的动态特性；同时在复杂环境扰动情况下具有更强的鲁棒性和抗干扰特性。Abstract: To solve the problems of the contradiction between response speed and overshoot and the poor anti-interference ability in the complex electromagnetic environment, the traditional PI controller is used in the resonant magnetic perturbations (RMP) coil power supply in tokamak. This paper adopts the linear active disturbance rejection control strategy to extract the differential quality of the reference signal in the transition differentiator to achieve fast current output without overshoot. Based on partially known mathematical model parameters of the power system, a fourth-order linear extended state observer is designed to estimate the disturbance of the system as a new state quantity to compensate the internal uncertainties and external disturbances of the power system. Finally, the simulation results show that compared with the traditional PI control strategy, the active disturbance rejection control strategy can effectively improve the dynamic characteristics of the output current signal. At the same time, it has stronger robustness and anti-interference characteristics in the case of complex environmental disturbance.
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图 4 不同
$ {w_{\text{c}}} $ 情况下的电源系统闭环伯德图Figure 4. Closed-loop Bode diagram of power system under different
$ {w_{\mathrm{c}}} $ conditions
图 5 直流母线处模拟不同频率扰动
Figure 5. Different frequency perturbations are simulated at the DC bus
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