全超导托卡马克核聚变发电装置快控电源的改进灰色预测滑模电流控制

doi:10.19595/j.cnki.1000-6753.tces.241221

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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.

Key words： Experimental advanced superconducting Tokamak (EAST) fast control power supply output current grey prediction sliding mode control

Received: 10 July 2024

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TM93

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	Huang Haihong
	Chen Zhao
	Wang Haixin

Cite this article:

Huang Haihong,Chen Zhao,Wang Haixin. Improved Grey Prediction Sliding Mode Current Control of Experimental Advanced Superconducting Tokamak Fast Control Power Supply[J]. Transactions of China Electrotechnical Society, 2025, 40(16): 5317-5329.

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https://dgjsxb.ces-transaction.com/EN/10.19595/j.cnki.1000-6753.tces.241221 OR https://dgjsxb.ces-transaction.com/EN/Y2025/V40/I16/5317

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