Abstract: In order to achieve the HL-3 plasma configuration control without dead zone, the poloidal field (PF) power supply needs to have four-quadrant circulating current operation capability with the controllable and fast zero-crossing characteristics. Based on the topology and load characteristics of the HL-3 poloidal field power supply, the circulation mathematical model of the four-quadrant power supply is deduced and a circulation control strategy is proposed by real time conduction angle modulation of the thyristor. The PSIM is used to verify the correctness and reliability of the strategy, and the simulation results show that the load current could cross the zero point quickly and smoothly under different control requirements, and dead zone of the circulating current is less than 2ms, which provides a guarantee for the stable control of the advanced plasma discharge in the HL-3 tokamak. 

Key words: Four-quadrant power supply, Conduction angle modulation, Circulation control

摘要： 为了实现 HL-3 装置等离子体位形控制无死区，不仅需要 HL-3 装置极向场电源具备四象限有环流运行能力而且具备可控且快速过零的特点。根据 HL-3 PF 电源的拓扑结构和负载特点，推导了四象限电源的环流数学模型，提出了通过实时调节晶闸管导通角来实现环流控制的策略。通过 PSIM 仿真平台搭建了电源有环流控制仿真模型。仿真结果表明，这种控制策略能够在不同控制目标下实现负载电流快速平稳过零且环流区间零点停留时间小于 2ms。研究结果为 HL-3 装置先进位形等离子体放电稳定控制提供了保障。

关键词: 四象限电源, 导通角调制, 环流控制