【摘要】 全超导托卡马克核聚变发电装置（EAST）快控电源是实现可控核聚变中等离子体垂直位移控制的重要装置。EAST快控电源采用多个H桥逆变支路并联工作模式，电源的总输出电流对参考电流的快速跟踪控制直接影响等离子体的平衡控制，而各个并联支路的输出电流一致性对支路稳定工作十分重要。为加快EAST快控电源输出电流动态响应速度和保证各个支路电流平衡，该文提出一种改进灰色预测新型快速变幂次趋近率滑模控制方法，实现EAST快控电源输出电流的良好控制。为加快输出电流响应速度，在总输出电流反馈环节加入改进灰色预测，根据输出电流的凹凸性和积分思想对灰色预测背景值进行重构，将预测值加入到原始序列替换旧信息以实现滚动预测，可以有效提高输出电流的预测精度。设计以总电流跟踪参考电流和支路电流均衡为控制目的滑模面，提出一种新型快速变幂次趋近率以加快滑模系统的收敛速度。仿真和实验验证了提出的控制方法对比其他传统控制方法具有更好的支路电流一致性和更快的输出电流响应速度。更多还原

【Abstract】 Experimental advanced superconducting Tokamak(EAST) fast control power supply is vital for plasma vertical displacement control in controllable nuclear fusion. Multiple H-bridge inverter branches in parallel operation mode are adopted in the EAST fast control power supply. Plasma balance control is affected by output current tracking reference current, and branch current consistency is crucial for branches’ stable operation. At present, proportional-integral(PI) control is used in engineering to achieve EAST fast control of power supply current control. However, it has shortcomings regarding output current speed and branch current balance control. This paper proposes an improved grey method based on fast variable power reaching law sliding mode control. Grey prediction is added to the total output current feedback loop to accelerate the response speed of the output current. The original sequence of grey prediction is transformed to ensure that the concavity and convexity of the original sequence are consistent with the actual output current. The integration idea is used to reconstruct the background value of grey prediction to reduce the prediction error from background value construction. T compensates for digital control delay, and the predicted current value is added to the original sequence to replace the oldest information and achieve multi-step rolling prediction. Grey prediction improvements enhance the EAST fast control of power supply output current prediction. The sliding mode surface with total current tracking reference current and branch current balancing as control objective is designed. In sliding mode control, according to the exponential reaching law and power reaching law, a new fast variable power reaching law is proposed to accelerate the convergence speed of the sliding mode control system. The output current dynamic response speed and branch current consistency are enhanced. Simulation and experimental results show that output current response speed is effectively accelerated by grey prediction, and branch current balance control is ensured by sliding mode control. Compared with the traditional current grey prediction, the improved grey prediction enhances output current prediction accuracy and accelerates dynamic speed. Compared with the traditional reaching law sliding mode current control speed, convergence speed is accelerated by the proposed new fast variable power reaching law sliding mode current control. The proposed grey prediction has a faster output current dynamic response speed and better branch current consistency, effectively improving EAST fast control and ensuring stable balance control of plasma vertical displacement.更多还原