The effectiveness of the magnetic confinement of plasma can be improved by elongat- ing the plasma cross-section in tokamak devices. But elongated plasma has vertical displacement instability, so a feedback control sy...The effectiveness of the magnetic confinement of plasma can be improved by elongat- ing the plasma cross-section in tokamak devices. But elongated plasma has vertical displacement instability, so a feedback control system is needed to restrain the plasma＇s vertical displacement. A fast control power supply is needed to excite the active feedback coils, which produces a magnetic field to control the plasma＇s displacement. With the development of EAST, the fast control power supply needs to keep on enhancing the fast response and output current. The structure of a new power supply is introduced in this paper. The method of multiple inverters paralleled with the current sharing reactor is presented to meet the need for large current and fast control. According to the design demands of the EAST fast control power supply, the adjuster of the current close loop is applied to the inverter, which can advance its ability to restrain the loop current in low frequency and DC output. The result of the experiment confirms the validity of the proposed scheme and control strategy.展开更多
聚变堆主机关键系统综合研究设施(Comprehensive Research Facility for Fusion Technology,CRAFT)负离子源中性束注入(Negative Neutral Beam Injection,NNBI)电源首次采用逆变型整流方案,但离子源的时变、非线性及高可控等负荷特征给...聚变堆主机关键系统综合研究设施(Comprehensive Research Facility for Fusion Technology,CRAFT)负离子源中性束注入(Negative Neutral Beam Injection,NNBI)电源首次采用逆变型整流方案,但离子源的时变、非线性及高可控等负荷特征给电源电压和纹波控制带来了挑战。采用傅里叶变换分析逆变型直流高压电源拓扑,针对低频开关信号,提出一种新的逆变型直流高压电源传递函数分析方法以快速建立系统近似模型。通过PWM方式控制逆变器开关管占空比,相控整流控制直流母线电压,实现系统输出电压闭环控制以及提升纹波抑制能力,并设计1200 V/5 A实验测试平台验证控制方法的有效性。展开更多
基金supported in part by the ITER Program of China(973 Program)(No.2011GB109002)National Natural Science Foundation of China(No.11275056)
文摘The effectiveness of the magnetic confinement of plasma can be improved by elongat- ing the plasma cross-section in tokamak devices. But elongated plasma has vertical displacement instability, so a feedback control system is needed to restrain the plasma＇s vertical displacement. A fast control power supply is needed to excite the active feedback coils, which produces a magnetic field to control the plasma＇s displacement. With the development of EAST, the fast control power supply needs to keep on enhancing the fast response and output current. The structure of a new power supply is introduced in this paper. The method of multiple inverters paralleled with the current sharing reactor is presented to meet the need for large current and fast control. According to the design demands of the EAST fast control power supply, the adjuster of the current close loop is applied to the inverter, which can advance its ability to restrain the loop current in low frequency and DC output. The result of the experiment confirms the validity of the proposed scheme and control strategy.
